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Service Manual Phaser ® Color Laser Printer 7750
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Page 1: Phaser 7750 Service Manual

Service Manual

P h a s e r®

C o l o r L a s e r P r i n t e r7750

Page 2: Phaser 7750 Service Manual
Page 3: Phaser 7750 Service Manual

Phaser 7750 Color Laser Printer

Service Manual

WarningThe following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions, unless you are qualified to do so.

First Printing: December 2003

071-0864-00

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Copyright © 2004, Xerox Corporation. All Rights Reserved. Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form without permission of Xerox Corporation.

Copyright protection claimed includes all forms of matters of copyrightable materials and information now allowed by statutory or judicial law or hereinafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as styles, templates, icons, screen displays, looks, etc.

XEROX®, The Document Company®, the stylized X®, CentreWare®, infoSMART®, Made For Each

Other®, Phaser®, PhaserSMART®, and the TekColor® icon are registered trademarks of Xerox

Corporation. PhaserCal™, PhaserMatch™, PhaserPort™, PhaserTools™, and the TekColor™ name are trademarks of Xerox Corporation.

Adobe® Reader®, Illustrator®, PageMaker®, Photoshop®, PostScript®, ATM®, Adobe Garamond®,

Birch®, Carta®, Mythos®, Quake®, and Tekton® are registered trademarks and Adobe Jenson™, Adobe

Brilliant Screens™ technology, and IntelliSelect™ are trademarks of Adobe Systems Incorporated or its subsidiaries which may be registered in certain jurisdictions.

Apple®, LaserWriter®, LocalTalk®, Macintosh®, Mac® OS, AppleTalk®, TrueType2®, Apple Chancery®,

Chicago®, Geneva®, Monaco®, and New York® are registered trademarks, and QuickDraw™ is a trademark of Apple Computer Incorporated.

PCL® and HP-GL® are registered trademarks of Hewlett-Packard Corporation.

Windows® and Windows NT® are registered trademarks of Microsoft Corporation.

Novell®, NetWare®, NDPS®, NDS®, and Novell Directory Services® are registered trademarks, and IPX™

and Novell Distributed Print Services™ are trademarks of Novell, Incorporated.

Sun® and Sun Microsystems® are registered trademarks of Sun Microsystems, Incorporated. SPARC® is a

registered trademark of SPARC International, Incorporated. SPARCstation™ is a trademark of SPARC International, Incorporated, licensed exclusively to Sun Microsystems, Incorporated.

SWOP® is a registered trademark of SWOP, Inc.

UNIX® is a registered trademark in the US and other countries, licensed exclusively through X/Open Company Limited.

As an ENERGY STAR® partner, Xerox Corporation has determined that this product meets the ENERGY STAR guidelines for energy efficiency. The ENERGY STAR name and logo are registered U.S. marks.

This product uses code for SHA-1 written by John Halleck, which is being used with his permission.

This product includes an implementation of LZW licensed under U.S. Patent 4,558,302.

Other marks are trademarks or registered trademarks of the companies with which they are associated.

PANTONE® Colors generated may not match PANTONE-identified standards. Consult current PANTONE

Publications for accurate color. PANTONE® and other Pantone, Inc. trademarks are the property of Pantone, Inc. © Pantone, Inc., 2000.

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Service Manual iii

Service Terms

Manual TermsVarious terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger present during a procedure or action. Be aware of all symbols and terms when they are used, and always read NOTE, CAUTION, and WARNING statements.

NoteA note indicates an operating or maintenance procedure, practice or condition that is necessary to efficiently accomplish a task. A note can provide additional information related to a specific subject or add a comment on the results achieved through a previous action.

CautionA caution statement indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, results in damage to, or destruction of, equipment.

WarningA warning statement indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, results in injury or loss of life.

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iv Phaser 7750 Color Laser Printer

Symbols Marked on the Product

DANGER high voltage.

Protective ground (earth) symbol.

Hot surface on or in the printer. Use caution to avoid personal injury.

The surface is hot while the printer is running. After turning off the power, wait 30 minutes.

Avoid pinching fingers in the printer. Use caution to avoid personal injury.

Use caution (or draws attention to a particular component). Refer to the manual(s) for information.

0

30 min.

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Service Manual v

Power Safety Precautions

Power SourceFor 110 VAC printers, do not apply more than 140 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. For 220 VAC printers, do not apply more than 264 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord. This manual assumes that the reader is a qualified service technician.

Plug the three-wire power cord (with grounding prong) into a grounded AC outlet only. If necessary, contact a licensed electrician to install a properly grounded outlet. If the product loses its ground connection, contact with conductive parts may cause an electrical shock.

Disconnecting PowerTurning the power off using the On/Off switch does not completely de-energize the printer. You must also disconnect the printer power cord from the AC outlet. Position the power cord so that it is easily accessible during servicing so that you may power down the printer during an emergency.

Disconnect the power plug by pulling the plug, not the cord. Disconnect the power cord in the following cases:

■ if the power cord or plug is frayed or otherwise damaged,

■ if any liquid or foreign material is spilled into the case,

■ if the printer is exposed to any excess moisture,

■ if the printer is dropped or damaged,

■ if you suspect that the product needs servicing or repair,

■ whenever you clean the product.

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vi Phaser 7750 Color Laser Printer

Electrostatic Discharge (ESD) Precautions

Some semiconductor components, and the respective sub-assemblies that contain them, are vulnerable to damage by Electrostatic discharge (ESD). These components include Integrated Circuits (ICs), Large-Scale Integrated circuits (LSIs), field-effect transistors and other semiconductor chip components. The following techniques will reduce the occurrence of component damage caused by static electricity.

Be sure the power is off to the chassis or circuit board, and observe all other safety precautions.

■ Immediately before handling any semiconductor components assemblies, drain the electrostatic charge from your body. This can be accomplished by touching an earth ground source or by wearing a wrist strap device connected to an earth ground source. Wearing a wrist strap will also prevent accumulation of additional bodily static charges. Be sure to remove the wrist strap before applying power to the unit under test to avoid potential shock.

■ After removing a static sensitive assembly from its anti-static bag, place it on a grounded conductive surface. If the anti-static bag is conductive, you may ground the bag and use it as a conductive surface.

■ Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage some devices.

■ Do not remove a replacement component or electrical sub-assembly from its protective package until you are ready to install it.

■ Immediately before removing the protective material from the leads of a replacement device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

■ Minimize body motions when handling unpackaged replacement devices. Motion such as your clothes brushing together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an electro-statically sensitive device.

■ Handle IC’s and EEPROM’s carefully to avoid bending pins.

■ Pay attention to the direction of parts when mounting or inserting them on Printed Circuit Boards (PCB’s).

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Service Manual vii

Service Safety Summary

General GuidelinesFor qualified service personnel only: Refer also to the preceding Power Safety Precautions.

Avoid servicing alone: Do not perform internal service or adjustment of this product unless another person capable of rendering first aid or resuscitation is present.

Use care when servicing with power: Dangerous voltages may exist at several points in this product. To avoid personal injury, do not touch exposed connections and components while power is on. Disconnect power before removing the power supply shield or replacing components.

Do not wear jewelry: Remove jewelry prior to servicing. Rings, necklaces and other metallic objects could come into contact with dangerous voltages and currents.

Power source: This product is intended to operate from a power source that will not apply more then 264 volts RMS for a 220 volt AC outlet or 140 volts RMS for a 110 volt AC outlet between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Warning Labels

Read and obey all posted warning labels. Throughout the printer, warning labels are displayed on potentially dangerous components. As you service the printer, check to make certain that all warning labels remain in place.

Safety Interlocks

Make sure all covers and the printer’s front panel are in place and all interlock switches are functioning correctly after you have completed a printer service call. If you bypass an interlock switch during a service call, use extreme caution when working on or around the printer.

CLASS 1 LASER PRODUCT

The Phaser 7750 Color Laser Printer is certified to comply with Laser Product Performance Standards set by the U.S. Department of Health and Human Services as a Class 1 Laser Product. This means that this is a class of laser product that does not emit hazardous laser radiation; this is possible only because the laser beam is totally enclosed during all modes of customer operation. When servicing the printer or laser unit, follow the procedures specified in this manual and there will be no hazards from the laser.

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viii Phaser 7750 Color Laser Printer

Servicing Electrical ComponentsBefore starting any service procedure, switch off the printer power and unplug the power cord from the wall outlet. If you must service the printer with power applied, be aware of the potential for electrical shock.

WarningTurning the power off by using the On/Off switch does not completely de-energize the printer. You must also disconnect the printer power cord from the AC outlet. Position the power cord so that it is easily accessible during servicing.

WarningDo not touch any electrical component unless you are instructed to do so by a service procedure.

Servicing Mechanical ComponentsWhen servicing mechanical components within the printer, manually rotate drive assemblies, rollers, and gears.

WarningDo not try to manually rotate or manually stop the drive assemblies while any printer motor is running.

Servicing Fuser Components

WarningThis printer uses heat to fuse the toner image to media. The Fuser Assembly is VERY HOT. Turn the printer power off and wait at least 5 minutes for the Fuser to cool before you attempt to service the Fuser Assembly or adjacent components.

7500-117

7500-118

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Service Manual ix

Regulatory Specifications

United States

The equipment described in this manual generates and uses radio frequency energy. If it is not installed properly in strict accordance with Xerox’ instructions, it may cause interference with radio and television reception or may not function properly due to interference from another device. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

■ Reorient or relocate the receiver (device being interfered with).

■ Increase the separation between the printer and the receiver.

■ Connect the printer into an outlet on a circuit different from that which the receiver is connected.

■ Route the interface cables on the printer away from the receiver.

■ Consult the dealer, Xerox service, or an experienced radio/television technician for help.

Changes or modifications not expressly approved by Xerox can affect the emission and immunity compliance and could void the user’s authority to operate this product. To ensure compliance, use shielded interface cables. A shielded parallel cable can be purchased directly from Xerox at www.xerox.com/office/supplies.

Xerox has tested this product to internationally accepted electromagnetic emission and immunity standards. These standards are designed to mitigate interference caused or received by this product in a normal office environment. This product is also suitable for use in a residential environment based on the levels tested.

In the United States this product complies with the requirements of an unintentional radiator in part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference; (2) this device must accept any interference received, including interference that may cause undesired operation.

Canada

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications, ICES-003.

Le présent appareil numérique n'émet pas de bruits radioélectrique dépassant les limits applicables aux appareils numériques de la classe B prescrites dans le Réglement sur le brouillage radioélectrique édicté par le ministere des Communications du Canada, NMB-003.

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European Union

Xerox Corporation declares, under our sole responsibility, that the printer to which this declaration relates is in conformity with the following standards and other normative documents:

Following the provisions of the Low Voltage Directive 73/23/EEC and its amendments:

Following the provisions of the Electromagnetic Compatibility Directive 89/336/EEC and its amendments:

EN 60950 (IEC 60950) "Safety of Information Technology Equipment including Electrical Business Equipment"

EN 55022:1998(CISPR 22)

"Limits and Methods of measurement of radio interference characteristics of Information Technology Equipment." Class B.

EN 61000-3-2:1995+A1:1998+A2:1998(IEC61000-3-2)

"Part 3: Limits - Section 2: Limits for harmonic current emissions (equipment input current less than or equal to 16A per phase)."

EN 61000-3-3:1995(IEC61000-3-3)

"Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker in low-voltage supply systems for equipment with rated current less than or equal to 16A."

EN 55024:1998 (CISPR 24)

"Information technology equipment - Immunity characteristics - Limits and methods of measurement. "

CISPR 24 Immunity Phenomena Basic Standard Test Specification

Electrostatic Discharge IEC 61000-4-2:1995 6 kV Contact, 10 kV Air

Radio-Frequency Electromagnetic Field (radiated)

IEC 61000-4-3:1995 80-1000 MHz, 3 V/m, 80% AM @ 1 KHz

Fast Burst Transients IEC 61000-4-4:1995 5/50 Tr/Th ns, 5 kHz Rep. Freq 0.5 kV Signal Lines 1 kV AC Mains

Line Surge IEC 61000-4-5:1995 Combination wave 2.0 kV Common mode 2.0 kV Differential mode

Radio-Frequency Electromagnetic Field (Conducted)

IEC 61000-4-6:1996 0.15 - 80 MHz, 3 V, 80% AM @ 1 kHz

Line voltage dips IEC 61000-4-11:1994 >95% dip for ½ cycle @ 50 Hz 30% dip for 25 cycles @ 50 Hz

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This product, if used properly in accordance with the user’s instructions, is neither dangerous for the consumer nor for the environment.

A signed copy of the Declaration of Conformity for this product can be obtained from Xerox.

Line voltage drop-out IEC 61000-4-11:1994

>95% dropout for 250 cycles @ 50 Hz

CISPR 24 Immunity Phenomena Basic Standard Test Specification

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xii Phaser 7750 Color Laser Printer

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Service Manual xiii

ContentsService Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iiiSymbols Marked on the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ivPower Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vElectrostatic Discharge (ESD) Precautions . . . . . . . . . . . . . . . . . . . . . . . . .viService Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viiRegulatory Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ix

1 General InformationPrinter Introduction and Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Phaser 7750 Printer Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3Parts of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Exterior - Front View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Exterior - Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Phaser 7750 Front Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Image Processor Board and Rear Panel Host Interface . . . . . . . . . . . . . . 1-7Routine Maintenance Items and Consumables . . . . . . . . . . . . . . . . . . . . 1-8Printer Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Physical Dimensions and Clearances . . . . . . . . . . . . . . . . . . . . . . 1-9Mounting Surface Specification . . . . . . . . . . . . . . . . . . . . . . . . . 1-10Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13Media and Tray Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

2 Theory of OperationSummary of the Phaser 7750 Print Process . . . . . . . . . . . . . . . . . . . . . . 2-2Paper Path of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Paper Size Sensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Paper Feeding and Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

EAHG Toner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9Technology Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Standby Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10Machine Run Control and NVRAM . . . . . . . . . . . . . . . . . . . . . . . 2-10Drive Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11System Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

ROS and Regicon Technology Overview . . . . . . . . . . . . . . . . . . . . . . . . 2-15Write Black Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

RegiCon Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17#1 Skew (Fine) Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19#2 IN/OUT Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19#3 Center Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

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#4 Skew (Rough) Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19View the RegiCon Patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22ATC Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24ADC Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25ADC Output Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26Lower Tray Feeders Sensor and Board Locations . . . . . . . . . . . 2-28

3 Error Messages and CodesIntroduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Accessing the Printer’s Error History . . . . . . . . . . . . . . . . . . . . . . 3-2Service Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Service RIP (Every Call) Procedures . . . . . . . . . . . . . . . . . . . . . . 3-4

Overview for Troubleshooting Error Codes . . . . . . . . . . . . . . . . . . . . . . . 3-5Using the Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . 3-5

System Startup and POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Power On Self Test (POST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7POST Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Error Messages and Codes Index Table. . . . . . . . . . . . . . . . . . . . . . . . . 3-10Error Messages and Codes Procedures. . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Black ATC Sensor Failure, Code 15 . . . . . . . . . . . . . . . . . . . . . . 3-15Transfer Roller Contact Failure, Code 20

Transfer Roller Retract Failure, Code 21. . . . . . . . . . . . . . . . 3-171st BTR Contact or Retract Failure. . . . . . . . . . . . . . . . . . . . . . . 3-18Accumulator Belt Home Position Took Too Long, Code 30

Accumulator Belt Home Position Failure, Code 31 . . . . . . . . 3-19Accumulator Belt Edge Sensor Failure, Code 32

Accumulator Belt Drive Logic Failure, Code 34 . . . . . . . . . . 3-22Unexpected Accumulator Belt Home Sensor Signal, Code 33 . . 3-24Fuser Main Lamp Failure, Code 35. . . . . . . . . . . . . . . . . . . . . . . 3-25Install or Reseat Fuser, Code 41 . . . . . . . . . . . . . . . . . . . . . . . . 3-26Fuser STS (Front) Warm Time Failure, Code 42. . . . . . . . . . . . . 3-27Fuser SSR1 On Time Failure, Code 43 . . . . . . . . . . . . . . . . . . . . 3-27Fuser Sub Lamp Overheat Failure, Code 44 . . . . . . . . . . . . . . . . 3-29Fuser STS (Rear) Failure, Code 45 . . . . . . . . . . . . . . . . . . . . . . . 3-30Fuser STS (Rear) Warm Time Failure, Code 46 . . . . . . . . . . . . . 3-31Fuser SSR2 On Time Failure, Code 47 . . . . . . . . . . . . . . . . . . . . 3-31Fan Failure, Code 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33Imaging Unit Motor Failure, Code 60 . . . . . . . . . . . . . . . . . . . . . 3-35Imaging Unit [1] [2] [3] [4] Communications Failure,

Code 70, 71, 72, 73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36Black Imaging Unit Motor Failure. . . . . . . . . . . . . . . . . . . . . . . . 3-37Waste Cartridge Full Detection Sensor Failure, Code 78 . . . . . . 3-38Engine Logic Board Failure, Code 80 . . . . . . . . . . . . . . . . . . . . . 3-39Controller to Engine Communications Failure, Code 81 . . . . . . . 3-39Engine Logic Board RAM/ROM Failure, Code 82 . . . . . . . . . . . . 3-39

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Engine Logic Board NVRAM Failure, Code 83 . . . . . . . . . . . . . . 3-40Controller to Engine Logic Board Time Failure, Code 84 . . . . . . 3-40Engine Logic Board Micro Pitch Failure, Code 85. . . . . . . . . . . . 3-40High-Voltage Power Supply Failure, Code 86 . . . . . . . . . . . . . . . 3-40Tray Lift Failure, Code 87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41Tray 1/MPT Size Sensor (7-274), Code? . . . . . . . . . . . . . . . . . . 3-43Lower Tray Communication Failure, Code 88. . . . . . . . . . . . . . . 3-44Reflective Sensor Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45Transmissive Sensor Procedure. . . . . . . . . . . . . . . . . . . . . . . . . 3-46Finisher Stapler Move Sensor On Failure, Code 111

Finisher Stapler Move Sensor Off Failure, Code 112. . . . . . . 3-47Finisher Stapler Failure, Code 113 . . . . . . . . . . . . . . . . . . . . . . . 3-49Front Tamper Home Sensor Failure, Code 114. . . . . . . . . . . . . . 3-51Rear Tamper Home Sensor Failure, Code 115 . . . . . . . . . . . . . . 3-52Finisher Stacker Height Sensor Off Failure, Code 116 . . . . . . . . 3-53Finisher Stacker Tray Failure, Code 117 . . . . . . . . . . . . . . . . . . . 3-55Finisher Stapler Front Corner On Failure, Code 118

Finisher Stapler Front Corner Off Failure, Code 119 . . . . . . . 3-57Finisher Eject Clamp Home Sensor On Failure, Code 120

Finisher Eject Clamp Home Sensor Off Failure, Code 121. . . 3-58Finisher Decurler Failure, Code 122 . . . . . . . . . . . . . . . . . . . . . . 3-59Finisher Set Clamp Failure, Code 123. . . . . . . . . . . . . . . . . . . . . 3-60Finisher Communication Failure, Code 124 . . . . . . . . . . . . . . . . 3-61Finisher Staple Mode Logic Failure, Code 125 . . . . . . . . . . . . . . 3-61

4 General TroubleshootingIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Service Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Service Diagnostic Front Panel Button Descriptions. . . . . . . . . . . 4-3Service Diagnostic Tests Table. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Front Panel Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14The Printer Does Not Come to a “Ready” State . . . . . . . . . . . . . 4-14

Inoperable Printer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15Troubleshooting Power Supplies and Interlocks . . . . . . . . . . . . . . . . . . 4-16

Troubleshooting AC Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16Troubleshooting the Low-Voltage Power Supplies. . . . . . . . . . . 4-17Troubleshooting the +3.3 VDC and

(2) +5 VDC Low-Voltage Power Supplies . . . . . . . . . . . . . . . 4-18Troubleshooting the 24 VDC LVPS. . . . . . . . . . . . . . . . . . . . . . . 4-18Interlock Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

Media Jams and the Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Media-Based Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

Operating System and Application Problems. . . . . . . . . . . . . . . . . . . . . 4-23Windows 2000, Windows XP, Windows Server 2003

Troubleshooting (TCP/IP). . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23Windows NT 4.x Troubleshooting (TCP/IP) . . . . . . . . . . . . . . . . 4-24

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xvi Phaser 7750 Printer

Windows 98 and Windows Me Troubleshooting . . . . . . . . . . . . 4-25Macintosh Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27Novell NetWare Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 4-28

5 Print-Quality TroubleshootingPrint-Quality Problems Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Defects Associated with Specific Printer Components. . . . . . . . . 5-2Front Panel Test Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Troubleshooting Print-Quality Page . . . . . . . . . . . . . . . . . . . . . . . 5-4Color Test Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5Analyzing the Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6Solid Fill Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7Repeating Defects Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8Remove Print Smears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Engine Test Prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9Paper Path Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9Print Laser Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9Print Halftones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10Print Grid 1-Dot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10Print Fast Scan 8 Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

Initial Actions Before troubleshooting any Print-Quality Problems: . . . . 5-12

6 Adjustments and CalibrationsRegistration Control (RegiCon) Adjustment Overview . . . . . . . . . . . . . . . 6-2

Coarse and Fine Skew Adjustments . . . . . . . . . . . . . . . . . . . . . . . 6-3In/Out Skew Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Center Skew Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

RegiCon Adjustment Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5RegiCon #1 Fine Skew Adjustment . . . . . . . . . . . . . . . . . . . . . . . 6-7RegiCon #2 In/Out Skew Adjustment . . . . . . . . . . . . . . . . . . . . . . 6-8RegiCon #3 Center Skew Adjustment . . . . . . . . . . . . . . . . . . . . . 6-9RegiCon #4 Coarse Skew Adjustment . . . . . . . . . . . . . . . . . . . . 6-10Coarse RegiCon Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

ATC Sensor Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Resetting NVRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16PostScript NVRAM Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Service Diagnostics NVRAM Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19PostScript NVRAM Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19

Clear Tech Rep Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20

7 Cleaning and MaintenanceService Preventive Maintenance Procedure. . . . . . . . . . . . . . . . . . . . . . . 7-2Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

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8 Service Parts DisassemblyOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Standard Orientation of the Printer for Disassembly . . . . . . . . . . 8-2General Notes on Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Print Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4Optional Lower Trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-57

9 Service Parts ListsSerial Number Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2Using the Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

Parts List 1.1 Drive Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4Part List 1.2 Main Drive Motor Assembly. . . . . . . . . . . . . . . . . . . 9-6Part List 1.3 Steering Motor and MOB . . . . . . . . . . . . . . . . . . . . . 9-7Part List 2.1 Tray 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8Part List 2.3 Tray Feeder and Left Lower Cover Assy . . . . . . . . . . 9-9Part List 2.4 Tray 2 Feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10Part List 2.6 Registration Transport . . . . . . . . . . . . . . . . . . . . . . 9-11Part List 2.7 Left Cover Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12Part List 2.8 Left Cover Assembly: 1 of 2 . . . . . . . . . . . . . . . . . . 9-13Part List 2.9 Left Cover Assembly: 2of 2 . . . . . . . . . . . . . . . . . . 9-14Part List 2.10 Exit Transport Assembly . . . . . . . . . . . . . . . . . . . 9-15Part List 2.12 Tray 1: 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16Part List 2.13 Tray 1: 2 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-17Part List 2.14 Tray 1 Feed Assembly . . . . . . . . . . . . . . . . . . . . . 9-18Part List 3.1 Laser (ROS) Assembly. . . . . . . . . . . . . . . . . . . . . . 9-19Part List 4.1 Xerographic Module: 1 of 2 . . . . . . . . . . . . . . . . . . 9-20Part List 4.2 Xerographic Module: 2 of 2 . . . . . . . . . . . . . . . . . . 9-21Part List 5.1 Lift Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-22Part List 5.2 Accumulator Belt Assembly . . . . . . . . . . . . . . . . . . 9-24Part List 5.6 Accumulator Belt Elevator . . . . . . . . . . . . . . . . . . . 9-25Part List 6.1 Developer Unit: 1 of 2 . . . . . . . . . . . . . . . . . . . . . . 9-26Part List 6.2 Developer Unit: 2 of 2 . . . . . . . . . . . . . . . . . . . . . . 9-28Part List 7.1 Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-29Part List 8.1 Air System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-30Part List 9.1 Electrical Components: 1 of 3 . . . . . . . . . . . . . . . . 9-32Part List 9.2 Electrical Components: 2 of 3 . . . . . . . . . . . . . . . . 9-34Part List 9.3 Electrical Components: 3 of 3 . . . . . . . . . . . . . . . . 9-35Part List 10.1 Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-36Part List 10.2 Top Cover and Front Panel . . . . . . . . . . . . . . . . . . 9-37Part List 10.3 Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-38Part List 11.1 Inverter Transport . . . . . . . . . . . . . . . . . . . . . . . . 9-39Part List 12.1 Duplex Unit Assembly . . . . . . . . . . . . . . . . . . . . . 9-40Part List 13.1 Image Processor and Engine Control Boards . . . 9-41Part List 16.1 Lower Trays 3/4/5 Assembly . . . . . . . . . . . . . . . . 9-42Part List 16.5 Lower Trays Paper Feeder: 1 of 2 . . . . . . . . . . . . 9-43Part List 16.6 Lower Trays Paper Feeder: 2 of 2 . . . . . . . . . . . . 9-44

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xviii Phaser 7750 Printer

Part List 16.13 Left Cover Assembly (LTD) . . . . . . . . . . . . . . . . 9-45Part List 16.14 Tray 4/5 Lift Gear Assembly . . . . . . . . . . . . . . . 9-46Part List 16.15 Electrical Components and Caster . . . . . . . . . . . 9-47Part List 16.16 Lower Tray Deck . . . . . . . . . . . . . . . . . . . . . . . . 9-48Hardware Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-49

10 Wiring DiagramsPlug/Jack Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2Plug/Jack Locator Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29

11 Phaser 7750 FinisherPhaser 7750 Finisher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2

Finisher Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2Finisher Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3Finisher Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5

Internal Assemblies of the Finisher . . . . . . . . . . . . . . . . . . . . . . 11-6Horizontal Transport Sensor, Interlock and Switch Locations . . 11-7Finisher Sensor, Interlock and Switch Locator Map . . . . . . . . . 11-8Finisher Sensor, Interlock and Switch Locator Map. . . . . . . . . . 11-9

Finisher Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10Horizontal Transport Assembly . . . . . . . . . . . . . . . . . . . . . . . . 11-11Horizontal Transport Top Open, Front, and Rear Cover . . . . . . 11-12Horizontal Transport Entrance Upper Cover Assembly . . . . . . 11-13Horizontal Transport Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Horizontal Transport Entrance Sensor and

Top Tray Full Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15Gate-In Solenoid Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16Finisher Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17Stack Height-Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . . 11-19Stacker Paper-Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . 11-20Set Clamp Clutch and Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21Eject Roll Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22Finisher Control Board, Bracket and Shield . . . . . . . . . . . . . . . 11-23Stacker Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25Paddle Shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-26Paper Transport Motor (Motor Assembly Main) . . . . . . . . . . . 11-27Cam Bracket Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-28Staple Unit Assembly and Motor . . . . . . . . . . . . . . . . . . . . . . . 11-29Compiler Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-30

Finisher Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-31Finisher Service Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-42

PL 17.1 Finisher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-42PL 17.2 Gate Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-44PL 17.3 Horizontal Transport Assembly: 1 of 2 . . . . . . . . . . . . 11-45PL 17.4 Horizontal Transport Assembly: 2 of 2 . . . . . . . . . . . . 11-46

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PL 17.5 Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-48PL 17.6 Top Cover and Eject Roll . . . . . . . . . . . . . . . . . . . . . . . 11-50PL 17.7 Paper Transport: 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . 11-52PL 17.8 Paper Transport: 2 of 2 . . . . . . . . . . . . . . . . . . . . . . . . 11-54PL 17.9 Staple Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 11-56PL 17.10 Compiler Tray Assembly . . . . . . . . . . . . . . . . . . . . . . 11-58 PL 17.11 Stacker Elevator Assembly. . . . . . . . . . . . . . . . . . . . 11-60 PL 17.12 Exit Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-62PL 17.13 Electrical Components . . . . . . . . . . . . . . . . . . . . . . . 11-64PL 17.14 Finisher Rack (Stand) . . . . . . . . . . . . . . . . . . . . . . . . 11-66

A AppendixMenu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2Service Diagnostic Menu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4Service Usage Profile Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5Missing Chain Link Codes Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . A-11Paper Weight Equivalence Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Index

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xx Phaser 7750 Printer

Page 23: Phaser 7750 Service Manual

1Chapter

General Information

In this chapter...■ Phaser 7750 Printer Configurations

■ Parts of the Printer

■ Phaser 7750 Front Panel Configuration

■ Image Processor Board and Rear Panel Host Interface

■ Routine Maintenance Items and Consumables

■ Printer Specifications

Page 24: Phaser 7750 Service Manual

1-2 Phaser 7750 Printer Service Manual

Printer Introduction and Overview

The Xerox Phaser 7750 Color Laser Printer Service Manual is the primary document used for repairing, maintaining, and troubleshooting the printer.

To ensure understanding of this product, complete the Xerox Phaser 7750 Printer Multi-Media Service Training and Self-Study Guide.

7750-234

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General Information 1-3

Phaser 7750 Printer Configurations

A replaceable “Configuration Chip” holds configuration information that enables or disables built-in features as described below.

*Requires 7750B to 7750DN upgrade.

FeaturesPrinter Configurations

7750B 7750DN 7750GX 7750DXF

Processor and Clock Rate (Mhz) G4715

G4715

G4715

G4715

Max Print Speed (Letter/A4) 35/35 35/35 35/35 35/35

Maximum Memory (GB) 1 1 1 1

Memory Configuration (MB) 256 384 512 512

Resolutions (dpi) Base memory allows 1200 x 1200 dpi, full-clip path A3 image.

Post Script Fonts 137 137 137 137

PCL5c Fonts 81 81 81 81

Direct PDF 1.4 Support Std Std Std Std

Job Pipelining Std Std Std Std

Hard Drive Productivity Features* N/A* Std Std Std

Full-Bleed Capability and Banner-Size* Printing

N/A* Std Std Std

Photo Mode* N/A* Std Std Std

Automatic 2-Sided Printing* N/A* Std Std Std

1500-Sheet Lower Tray Deck Opt Opt Std N/A

2500-Sheet High-Capacity Feeder Opt Opt N/A Std

Ethernet Interface (Networking) N/A* 10/100 10/100 10/100

USB 2.0 Std Std Std Std

Hard Drive Std Std Std Std

Finisher N/A Opt Opt Std

PhaserMatch Version 3.0 Software N/A Opt Std Std

PhaserCal Software Opt Std Std Std

Page 26: Phaser 7750 Service Manual

1-4 Phaser 7750 Printer Service Manual

Parts of the Printer

Exterior - Front View

1. Face Down Tray 6. Finisher Top Door H Release

2. Front Door 7. Finisher Output Tray

3. Tray 1 (MPT) 8. Finisher Door J

4. 2500-Sheet High-Capacity Feeder (1500-Sheet Lower Tray Deck not shown)

9. Front Door right side release (release on left side not shown

5. Power Switch

7750-445

1

2

9

6

5

4

3

7

8

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General Information 1-5

Exterior - Rear View

1. USB Connection 4. AC Power Cord Connection

2. Ethernet 10/100 Base-T Connection 5. Latch for Left Door A

3. GFI Reset Button 6. Tray 1 (MPT) in closed position

3

4

5

6

7750-446

1

2

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1-6 Phaser 7750 Printer Service Manual

Phaser 7750 Front Panel Configuration

The printer’s front panel consists of one LED, a display window, and six buttons. These buttons are used to navigate the menu system, perform functions, and select modes of operation for the printer.

LED Indicators:

Front Panel Button Descriptions

Front Panel Shortcuts

■ Green = Ready to Print ■ Flashing Green = Receiving, Processing Data, Printing or Power Saver Mode

■ Flashing Yellow = Warning ■ Flashing Red (Continuously) = Error

1 LED (Power/Status) 5 Up button - scrolls up the menu system

2 Graphic front panel display 6 Down button - scrolls down the menu system

3 Cancel button 7 OK (select) button

4 Back button 8 Information “i” button - for additional explanation or help

Mode Press this selection at Power On

Skip execution of POST diagnostics OK

Print Service Diagnostics Map INFO

Reset PostScript NVRAM BACK+OK

Password Bypass UP+DOWN

Enter Service Diagnostics BACK+INFO

P h a s e r 7 7 5 0

7750-4471

3

2

5

4 6 87

Tray 2 Paper Type

Plain PaperHeavy Plain PaperPhaser Series-25 Premium TransparencyExit

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General Information 1-7

Image Processor Board and Rear Panel Host Interface

The components on the image processor board are illustrated in the following figure.

1. RAM (SODIMM) 6. Processor Fan

2. RAM (SODIMM) 7. NVRAM

3. USB Connector 8. Ethernet Connector

4. Health LEDs

5. Hard Drive

7750-170

7

4

83

6

2 1

5

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1-8 Phaser 7750 Printer Service Manual

Routine Maintenance Items and Consumables

Routine Maintenance Items Consumables

1. Transfer Roller 6. Toner Cartridges

2. Fuser

3. Belt Cleaner Assembly Service Parts

4. Imaging Units 7. Accumulator Belt

5. Waste Cartridge

Consumable capacity is based on 5% per color on A4/Letter paper.Routine Maintenance Item capacity is based on A4 @ 5%.

Routine Maintenance: Consumables:

Transfer Roller 100,000 Cyan Toner 22,000

Imaging Units 30,000 A4 images Magenta Toner 22,000

Fuser Unit 60,000 Yellow Toner 22,000

Waste Cartridge 27,000 Black Toner 32,000

Service Parts:

Accumulator Belt Lifetime (480,000 - coverage independent)

7750-449

6 7

5

1

2

3

4

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General Information 1-9

Printer Specifications

Physical Dimensions and Clearances

Print Engine Dimensions Value

Height: 493 mm (19.4 in.)

Width: 644 mm (25.4 in.)

Depth: 715 mm (28.15 in.)

Weight: 91 kg (200 lbs.)

2500-Sheet High-Capacity Feeder Dimensions Value

Height: 364 mm (14.3 in.)

Width: 644 mm (25.4 in.)

Depth: 682 mm (26.9 in.)

Weight: 40 kg (88 lbs.)

1500-Sheet Lower Tray Deck Dimensions Value

Height: 364 mm (14.3 in.)

Width: 644 mm (25.4 in.)

Depth: 682 mm (26.9 in.)

Weight: 30 kg (66 lbs.)

Clearances - For the optional finisher clearances, see "Phaser 7750 Finisher" on page 11-1

10.0 cm(4.0 in.)

5.0 cm(1.96 in.)

160.4 cm(63.1 in.) 106.1 cm

(41.8 in.)

42.5 cm(16.7 in.)

36.8 cm(14.5 in.)

7750-224

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1-10 Phaser 7750 Printer Service Manual

Mounting Surface Specification

These specifications apply to any Phaser 7750 printer used as a table-top printer, without a lower tray assembly or cart. There are 4 feet on the bottom of the printer. The right hand side of the printer is more susceptible to problems due to foot placement.

1. In order to function properly, the printer must be located on a surface with the following minimum dimensions. All 4 feet must rest squarely on the mounting surface.

2. Mounting surface flatness must be within the range shown in the following figure.

485 mm Min19.10 in

530 mm Min20.87 in

7750-339

Right Hand Side

7750-340

5mm Max

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General Information 1-11

3. The printer must not be tipped or tilted more than is shown in the following figure.

Failure to adhere to these mounting specifications will void all guarantees of print quality and/or performance. Known problems that can occur as a result of exceeding the mounting surface specifications are:

■ Color-to-Color mis-registration, primarily in the horizontal (laser scan) direction.

■ A smear or band of toner approximately 40 mm from the trailing edge of the print.

7750-341

5mm Max

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1-12 Phaser 7750 Printer Service Manual

Functional Specifications

Electrical Specifications

Characteristic Specification

Printing process The Phaser 7750 printer uses lasers with an electrophotographic four-color (CMYK) single pass print process.

Color medium Four color toner cartridges: Cyan, Yellow, Magenta, and Black EAHG Toner

Resolution / Print Modes

Standard: 1200 x 600 dpi OHP: 1200 x 600 dpi Enhanced: 1200 x 1200 dpi Photo: 1200 x 1200 x 1-bit under color

First Page-Out (Letter/A4)

< 11 seconds color<10 seconds monochrome

Warm-up time Warm up time to Ready from power on or ENERGY STAR, 40 seconds.First page out from Ready, 7.4 seconds mono, 6.7 seconds color.

Print Speeds

Speeds Ltr/A4Ltr/A4Duplex Tab/A3

Tab/A3 Duplex

Standard 1200 x 600 dpi 35 28 17 13/13

Photo 1200 x 1200 dpi 22 18 11 8

OHP 8 N/A N/A N/A

Card 11 N/A 9 N/A

Labels N/A N/A

Characteristic Specification

Primary line voltages 115/127 VAC 10 A 200/240 VAC 5 A

Frequency range 50/60 Hz (+/- 3 Hz)

Power consumption Power saver: 45 wattsStandby: 130 wattsReady: 220 wattsContinuous Printing: 220 to 600 watts averagePeak (warming up): 1100 watts

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General Information 1-13

Environmental Specifications

Media and Tray Specifications

For information on approved Phaser 7750 media and paper types, print the “Paper Tips Page” from the printer’s front panel.

Characteristic Specification

Temperature: Operating: 10 to 32o C

Storage: -20 to 50o C

Humidity Normal operating: 10 to 85% relative humidityOptimum operating: 25 - 75%

Altitude 0 to 2500 m (8000 ft.)

Acoustic NoiseIdle: 29 dB(A)Printing: 52 - 53 dB(A)

Page 36: Phaser 7750 Service Manual

1-14 Phaser 7750 Printer Service Manual

Page 37: Phaser 7750 Service Manual

2Chapter

Theory of Operation

In this chapter...■ Summary of the Phaser 7750 Print Process

■ Paper Path of the Printer

■ EAHG Toner

■ Technology Overview

■ ROS and Regicon Technology Overview

■ RegiCon Overview

■ Sensors

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2-2 Phaser 7750 Printer Service Manual

Summary of the Phaser 7750 Print Process

The Phaser 7750 Color Laser Printer is a ‘full-color laser printer’, that utilizes electrophotographic recording principles to place a full color image onto the print media. The system contains a drum and developing unit for each color (yellow, magenta, cyan and black (YMCK), and places the toner image of each color onto print media via an intermediate transfer belt, producing full-color prints.

A summary description of the printing process is presented in the following steps:

1. Charging: The imaging unit charge roller is negatively charged by the High-Voltage Power Supply (HVPS) and is kept in contact with the drum surface to provide a uniform negative charge on the drum as it rotates at a constant speed. This occurs simultaneously for YMCK.

2. Exposure: The laser unit emits laser beams modulated by image data from the Image Processor board. The laser beams are directed onto the drum surface through a system of mirrors and lenses. A rotating polygonal mirror causes the laser beams to scan the drum surface from end to end (axially) as it rotates. The beams are turned on to print a pixel and off when no printing is required. The negative charge on the drum surface is reduced at each point where the energized laser beam strikes, to form an electrostatic latent image on the drum surface. This process is performed simultaneously for YMCK.

3. Development: Toner is electrostatically attracted to the invisible latent image on the drum surface to form the visible image on the drum. Toner is fed into the developer using the agitator and auger. The toner and the carrier in the developer form a layer on the magnet roller in the developer. The magnet roller turns against the surface of the drum and is kept at a constant negative potential. At areas on the drum surface where the negative charge has not been reduced by the laser light, potential between the drum and the toner particles is lower than that between the magnet roller and the toner particles. At areas where the drum charge has been reduced, the potential between the particles and drum is higher than between the magnet roller and toner particles are attracted to the drum. A thin semiconductive sleeve on the magnet roller is vibrated by an AC voltage to encourage migration of the toner particles to the drum. When the toner particles attach to the drum, the negative charge of the particles reduces drum potential at that point, thus reducing the attraction of additional toner particles. This process is performed simultaneously for YMCK.

4. Primary Transfer (Drum --> Accumulator Belt): All four toner images, formed on the individual drum surfaces, are transferred to the accumulator belt sequentially to create a complete, 4-color toner image. The accumulator belt is conductive and receives a high positive charge from the HVPS. The negatively charged toner image on each drum surface is attracted by the high positive potential and transfers to the accumulator belt. During this transfer, the remaining negative charge on the drum is neutralized by the high positive charge on the belt.

5. Cleaning: The drum cleaner consists of a blade and a brush in contact with the drum after the point where the toner is transferred to the accumulator belt. The cleaner brush receives a high positive voltage from the HVPS allowing it to electrically attract any toner particles remaining on the drum. Toner remaining on the accumulator belt after the image transfer to the print media is removed by the belt cleaner assembly and transferred to the waste bin.

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Theory of Operation 2-3

6. Secondary Transfer: The image on the accumulator belt is transferred onto the print media using the voltage supplied by the transfer roller. The conductive transfer roller receives a high positive voltage from the HVPS that puts it at a higher potential than the accumulator belt. Since the transfer roller is located behind the print media, the 4-color toner image is attracted to the lower potential and transfers to the surface of the print media.

7. Cleaning: The accumulator belt cleaner consists of a cleaner blade in contact with the accumulator belt surface after the point where the toner is transferred to the print media. Toner remaining on the accumulator belt after the image transfer to the print media is stored in the waste cartridge.

8. Fixing: The finished toner image is unstable and easily smeared. To fuse the image, the print media goes through the fuser assembly where it passes between a pressure belt and the heat roller. The toner is fused onto the print media by the combination of heat and pressure.

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2-4 Phaser 7750 Printer Service Manual

Paper Path of the Printer

The Phaser 7750 printer has a C-shaped paper-handling path. The design helps it achieve high production outputs. The paper paths available for the paper exiting the fuser are:

■ Straight to the Output Tray in the Top Cover (facedown).

■ Straight to the optional Finisher.

■ Paper can be inverted for 2-sided printing.

Trays 1-5

The paper trays consist of four main trays and one Multi-Purpose Tray on the side of the printer. Tray 1 (MPT) is located on the left side of the machine and allows feeding of specialty media stock, envelopes, and custom size paper. On the GX configuration, Trays 2, 3, 4, and 5 are identical and can be interchanged. On the DXF configuration (not shown), Trays 2 and 3 are identical and can be interchanged. Trays 4 and 5 are the high-capacity feeder paper trays.

7750-125

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Theory of Operation 2-5

Paper Size Sensing

Trays 2 through 5 automatically sense the standard size media loaded in the printer by using the paper size sensors mounted on the back inside of the printer. When paper is loaded in the tray and the paper guides are adjusted, the levers on the bottom of the trays change the size sensor actuator locations.

Actuating different combinations of the paper size sensors produces different combinations of high and low signals, which tell the printer logic what size of paper to display on the front panel, once the tray has been re-inserted into the printer.

Tray presence is also detected by the paper size sensor. Any actuation of the paper size sensor signals the tray is present.

Paper Feeding and Sensing

NoteThe tray feed / lift motor is a dual purpose motor, providing both the paper feed and tray lift drive functions.

When the control logic calls for paper feed, the pick roller moves a sheet of paper to the nip of the feed rollers and retard rollers. The rollers feed the paper to the takeaway roller in the vertical transport where it is stopped and registered at the registration roller.

Tray 5 FeedOut Sensor

Tray 4 FeedOut Sensor

Tray 2 FeedOut Sensor

TakeawaySensor

RegistrationSensor

Registration Roll

Takeaway Roll 2Feed Roller

Retard RollerPick Roll

Tray 2-5 Paper Path 7750-456

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2-6 Phaser 7750 Printer Service Manual

Stack Height Sensing

The pick roller feeds the paper to the paper path. As paper continues to feed, the stack height drops. When it reaches a certain level an actuator unblocks the stack height sensor. The control logic then stops paper feed and raises the paper tray. This causes the actuator flag to block the stack height sensor again which signals the control logic to resume feeding paper. The stack height sensing operates the same way for Trays 2, 3, 4, and 5.

Paper Present Sensing

When the last sheet is fed from any of the four main trays, the no paper sensor actuator drops into an opening in the paper tray and unblocks the no paper sensor.

Tray 1 (MPT) Loading and Feeding

When media is placed in Tray 1, the lead edge deactuates the Tray 1 no paper sensor. The sensor signals the control logic that paper is present. When the last sheet of paper is fed from the tray the actuator drops through the opening of the tray and activates the sensor.

When the user prints from Tray 1, the control logic supplies mechanical drive to the feed roller and nudger. When the control logic calls for paper feed, it sends a feed signal to momentarily energize the Tray 1 solenoid causing the feed roller to pivot down. When the pick roller contacts the paper, a sheet is fed into the nip between the feed roll and the takeaway roll.

Tray 1 TakeawayRoll

7750-457

Tray 1Solenoid

Tray 1 Feed Roll

Tray 1 No PaperSensor

RegistrationClutch

RegistrationRollRegistrationSensorOHP Sensor

TakeawayClutch

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Theory of Operation 2-7

2-Sided Printing

Paper leaving the fuser can be directed to the top output tray or the finisher. If 2-sided (duplex) printing has been selected, paper can be directed through the inverter transport and into the duplex transport. The duplex paper path reverses the direction of paper travel and the duplex gates direct the paper through the inverter and into the duplex transport. An image can then be placed on the second side of the media.

ACCUMULATOR BELT

MPT

Face DownTray

Main Motor

Duplex Motor

FUSER

Registration

Exit Roll

FuserExit Roll

Regi. Roll

Exit Gate

Full PaperStack Sensor

Regi.Sensor

Fuser Assy

Regi. Clutch

Inverter ForwardClutchInverter Reverse

Clutch

Fuser ExitSwitch

7750-450

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2-8 Phaser 7750 Printer Service Manual

Fuser

The fuser receives its drive from the main motor. After the toner images are applied to the paper, the paper is then passed through the fuser. The fuser belt is pressed against the heat roller to melt the toner and bond it to the paper.

The fuser belt is always spring loaded against the heat roller, but can be released for jam clearance. The flexibility of the belt (versus a pressure roller) provides a longer contact time and a larger area of contact with the heat roller, thereby providing better fusing.

Fuser Life Expectancy

The life expectancy of the fuser is 60,000 letter/A4 size pages. Several factors can reduce the life of the fuser:

■ Greater than 5% coverage

■ Paper use larger than letter size

■ Printing on heavy media

■ Printing short-edge feed

■ Printing on transparencies or specialty media

Three fuses on the fuse board in the fuser assembly are used in conjunction with a PostScript algorithm to determine the life used. Fuses are blown in the reverse order than they were on the Phaser 7700 (3,2,1 instead of 1,2,3). Fuse #3 is blown after 100 prints are made. Fuse #2 is blown at 50% of life and fuse #1 is blown at 99% of life used.

If fusers are swapped between printers and don’t have the exact same configuration of blown and closed fuses the printer will make a fuser life assumption based on which fuses are closed and then set the fuser life using that assumption after 100 prints are run. All fuses closed, new fuser. Fuse 3 open, fuse 2 and 1 closed, life will be set at 25% used. Fuse 3 and 2 open fuse 1 closed, life will be set at 75% used. All fuses open, life is set at 99% used.

Page 45: Phaser 7750 Service Manual

Theory of Operation 2-9

EAHG Toner

EA (Emulsion Aggreate High Gloss) toner is a relatively new type of toner with particles that are more spherical and uniform in size. This toner will be used for all Phaser 7750 Printer applications. The image below shows the EA toner particles. The small bumps are particles of additives that produce some of the characteristics of the new toner.

The image below shows some DC12 conventional toner. Like the EA toner, the small bumps on the outside of the toner particles are additives that are used to provide specific characteristics.

Page 46: Phaser 7750 Service Manual

2-10 Phaser 7750 Printer Service Manual

Technology Overview

Standby Power

There are two types of standby power in this machine: switched AC and switched DC. Switched power requires that both the circuit breaker and the printer’s main power switch be in the ON position.

■ Switched AC Power - This is the control signal whose power off transition is delayed to allow the second bias transfer roller to retract.

■ Switched DC Power - Switched AC power from the AC Drive PWB goes to the low voltage power supplies for the printer. Whenever switched AC power is provided to the three low voltage power supplies, their output DC voltages are activated by a 5 VDC signal.

Machine Run Control and NVRAM

Machine control centers on the following:

■ Engine Control Board

■ Image Processor Board

Machine parameters are held by non-volatile memory located in two places:

■ Image Processor NVRAM

■ Engine NVRAM

7750-458

Engine Control Board

Image Processor Board

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Theory of Operation 2-11

Drive Power

The Drive Power subsystem includes five motors and their driven assemblies.

■ Main Motor - The main motor provides the drive for paper feed, black developer housing, and the fuser. The main motor gets 24 VDC power from the +24 Volt power supply by way of the interface board. The motor enable and speed control signals come from the microprocessor on the engine control via the interface board.

■ Accumulator Belt Motor - The accumulator belt motor turns the drive roller for the accumulator belt and the accumulator belt cleaner auger.

■ Transfer Roller Motor - Engages and retracts the transfer roller.

■ Developer Motor - The developer motor provides the drive for the C, Y, and M developers.

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2-12 Phaser 7750 Printer Service Manual

■ Imaging Unit Motors - There are two imaging unit motors providing drive to the four imaging units: one drives the Y, M, and C drums, and the other drives the K (black) drum. Like the main motor, the drum motors get 5 and 24 volt DC power from 5 and 24 volt power supplies via the interface board. The motors are enabled and the speed is controlled by the engine control board.

Developerdrive assy

Maindriveassy

Imaging Unit drive assy

Accumulatorbelt drive assy

7750-451

BlackImaging Unitmotor (K)(hidden)

Page 49: Phaser 7750 Service Manual

Theory of Operation 2-13

System Power Supplies

The System Power Supplies consist of: the T1, T2, and T3 HVPS, the 24 Volt LVPS, 3.3 VDC LVPS, and the (2) 5VDC LVPS.

High Voltage Power Supply/ T2 Board

AC Drive Board

Noise Filter Board

GFI

High Voltage Power Supply/ T3 Board

High Voltage Power Supply/ T1 Board

Engine Control Interface Board

S7700-317

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2-14 Phaser 7750 Printer Service Manual

24 V LowVoltage PowerSupply

24 V LowVoltage PowerSupply Fan

3.3 V Low VoltagePower Supply

5 V Low VoltagePower Supply

AC Power Chassis

7750-448

Page 51: Phaser 7750 Service Manual

Theory of Operation 2-15

ROS and Regicon Technology Overview

The locations of the ROS and the ROS shutter solenoid are shown in the following figure.

■ There are four ROS shutters (not shown).

■ The ROS module is field replaceable and contains four laser diodes, one polygon motor/mirror, and several lenses and mirrors.

■ The ROS module “reflects” the four laser beams so that they strike the Imaging Units correctly.

■ The ROS module contains four mirrors that can be adjusted for skew using RegiCon. This adjustment MUST be made when the ROS is replaced.

■ NEVER remove the cover from a ROS module for ANY reason - contamination will result.

Write Black Process

The Phaser 7750 Printer uses a “black writing” process for exposing the imaging units.

In the write black process, the image areas are discharged, or exposed. Because the image area is normally much smaller than the background area, the Write Black approach extends the life of the laser diode.

In the Write Black process, the negative toner particles are attracted to the more positive image areas on the photoreceptor and repelled by the higher negatively charged background areas. A negative developer bias voltage assures good development of the image areas.

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2-16 Phaser 7750 Printer Service Manual

In the Write Black process for the Phaser 7750 printer, the four individual images, one in each color, are transferred to the surface of the accumulator belt.The second transfer roller puts a positive charge on the copy paper. Then the four-color image is transferred to the sheet of paper in one pass. The positive charge attracts the negative toner particles from the accumulator belt to the copy paper.

The image data is processed through the image processor board and is then routed to the engine control board. On the image processor board, the process of screen generation is conducted. In this process, the incoming image data is arranged in a screen pattern before being sent to the ROS (Laser).

The engine control board is the ROS driver board. In other words, it is the last location in the imaging path before the image data becomes optical information in the form of modulated laser beams.

In the case of the Phaser 7750 printer, the engine control board sequentially passes data that comprises the 4 different color planes to the Laser Diodes in the ROS.

The color planes are digital at this time, that is, they are a stream of 1’s and 0’s. The digital information is applied to the ROS control circuit to turn the laser diodes on and off. (A 0 turns the laser on and a 1 turns it off.) Using this technique, the digital levels that make up the image data are modulated onto the laser beams.

As each of the four laser diodes scans the surface of the drum (in the YMCK sequence), the image data is reflected and collimated within the ROS and is finally reflected out to each imaging unit where the charged photoreceptor is exposed by the laser. As the laser beam scans across the photoreceptor, a latent image is created on the surface of the drum. As the imaging unit turns, it acquires the latent image from the ROS, and toner from the developer housing.

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Theory of Operation 2-17

RegiCon Overview

The RegiCon procedure is used to ensure that the four lasers in the ROS are correctly aligned to provide correct registration for each color.

The Mark On Belt (MOB) sensors are used in this procedure to determine the relative position of chevrons developed onto the accumulator belt.

The MOB sensors are located below the accumulator belt. The RegiCon procedures, read chevrons on the front, rear, and center of the accumulator belt.

In the Center Setup procedure, the position of the front MOB sensor is changed to allow it to read the chevrons developed on the center of the accumulator belt.

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2-18 Phaser 7750 Printer Service Manual

The chevron patterns used for the RegiCon setup are shown in the following figure.

The components of the RegiCon adjustment include:

■ Skew (Fine) Setup (Pattern 1)

■ IN/OUT Setup (Pattern 1)

■ Center Setup (Pattern 1)

■ Coarse Skew Setup (Pattern 2)

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Theory of Operation 2-19

#1 Skew (Fine) Setup

The Skew (Fine) Setup is performed to ensure that images on the accumulator belt are not skewed.

To complete this part of the procedure, a series of chevron images are developed on the belt, using all four colors. (Pattern 1 on the previous figure shows the chevron patterns). The chevron patterns are developed on the belt on the front and rear edges of the accumulator belt. The MOB sensors read them, and the horizontal and vertical position of the marks are calculated. If the marks are found to be skewed, the diagnostic tool indicates the number of clicks and direction that the adjustment screws on the front of the ROS should be turned to correct the skew.

#2 IN/OUT Setup

Like Skew, the IN/OUT Setup procedure uses the chevrons that are developed on the front and rear edges of the accumulator belt. (Pattern 1 on the previous figures shows the chevron patterns). During this procedure, logic automatically performs a magnification adjustment so that the scan lines are the same length for all four colors.

#3 Center Setup

The Center Setup procedure determines if the chevrons developed on the center of the accumulator belt are in the correct location relative to the front and rear chevrons.

To perform the procedure, the MOB sensor is positioned to the center of the accumulator belt and the chevrons are developed. (Pattern 1 on the previous figures shows the chevron patterns).

In this procedure, the midpoints of the scan lines for all four colors are aligned for magnification balance.

#4 Skew (Rough) Setup

The Skew (Rough) Setup is used only when skew is outside of the measurement parameters of Skew (Fine) Setup. It should be run in situations when the registration is so far out of specification as to be immeasurable by the Skew (Fine) Setup routine. In this routine, Pattern 2 (from the figure showing the chevron patterns) is developed and the registration of the images is calculated. If necessary, the skew of the image can be adjusted manually.

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2-20 Phaser 7750 Printer Service Manual

View the RegiCon Patterns

It is possible to see the patterns that are developed on the accumulator belt for the RegiCon calibration by performing the following steps:

■ If there is a finisher present on the machine, slide it to the right so that the right hand access door to the accumulator belt can be opened. Open the access door and activate the interlock.

■ Power down the Phaser 7750 printer.

■ Open the front door and release the accumulator belt by releasing the latch assembly and pulling down the lift lever as shown in the figure below.

■ Lift the accumulator belt assembly release and pull the accumulator belt assembly out until the stand plate is accessible.

■ Remove two screws that hold the stand plate on the front and rear of the accumulator belt assembly. Lift the stand plate as shown in the figure below, and remove it.

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Theory of Operation 2-21

■ Reinsert the accumulator belt assembly into the Phaser 7750 printer without the Stand Plate. The area that was covered by the Stand Plate will be the area in which you see the images on the accumulator belt.

■ With the right hand door interlock activated, turn the printer on.

NoteFor machines with finishers, unplug the finisher from the Phaser 7750 printer prior to powering up. It will be necessary to have the finisher undocked to view the images on the belt.

■ As soon as the chevrons are visible, deactivate the right hand door interlock.

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2-22 Phaser 7750 Printer Service Manual

Sensors

Looking at the imaging path illustration below, note that there are two kinds of sensors that play an important role in the control of image quality for the printer.

Networkcable

Engine Board

I/P Board InternalTestPatterns

Imaging Unit

Developer Housing &ATC Sensors

ROSChargeRolls

TonerCartridge

(4)

Output

ADCSensor

Fuser

2ndTransferRoller

1st

TransferRoller

7750-452

7750-460

Transfer Roller SensorTray 1 Take Away Sensor

Paper On Belt Sensor

Transparency SensorRegistration Sensor - on left door optic

MPT No Paper Sensor

Tray 1 No Paper Sensor/Level Sensor

MPT Paper Size Sensor

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Theory of Operation 2-23

7750-461

Accumulator BeltEdge Sensor

Accumulator BeltHome Sensor

DuplexWait Sensor

Automatic TonerConcentration Sensor K, C, M, Y

EnvironmentSensor

Automatic DensityControl Sensor

Mark OnBelt Sensor

Waste CartridgeFull Sensor

Tray 1 PaperSize Sensor

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2-24 Phaser 7750 Printer Service Manual

ATC Sensors

The ATC sensor is a part of the developer housing. It provides an indication of the concentration of toner relative to the carrier beads contained in the developer housing.

Generally speaking, higher concentrations of toner are more easily developed, because they have less triboelectric bond to the carrier beads. Lower concentrations have a higher attraction to the carrier beads, and therefore require higher charge to develop out.

The ATC sensor provides its information to the process controls.

The "Tone Up/Down" test in diagnostics compares a corrected target value to the ATC sensor value on each individual developer. If the corrected target value is within +/-30 of the sensor value then printer logic assumes toner concentration is correct. If the corrected target value is greater than 30 units above the sensor value, printer logic detects that the toner concentration is lighter than the target value and adds toner to the developer.

If the test values all equal the results shown below, the test has not detected any problems.

<Tone Up/Down>

Result = 0 Status = 0

ATC Sensor Fail = None

ATC Limit Warn = None

ATC Change Warn = None

If the ATC sensor fails, possible causes are:

■ The sensor connection is bad, try reseating the connector.

■ The sensor is defective.

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Theory of Operation 2-25

■ There is a developer problem either with the housing or the amount of beads in the developer.

ADC Sensor

The sensor in this figure is the Automatic Density Control (ADC) sensor. It is located on the MOB Sensor Assembly.

To control image quality, this sensor looks at patches that are developed onto the accumulator belt at various times.

Data from the ADC sensor is used to:

■ Adjust the intensity of each laser in the ROS.

■ Set the look up table for Tone Reproduction Curve (TRC).

■ Determine amount of toner to add to developer (triggered by ATC sensor).

Tone Up/Down Messages

Front Panel Message Typical Values

[CMYK] Sens Warn 0

Pages = XX Number of pages since last check

ATC Control = XXX 565

ATC Corr = XXX 604-606

Ave ATC = XXX 593-615

ATC Vol = XXX 320-428

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2-26 Phaser 7750 Printer Service Manual

■ Determine toner cartridge empty (triggered by ATC sensor).

2 patches per color are printed and ADC control is initiated at:

■ Power-on, return from ENERGY STAR, after interlock close.

■ End of each job.

■ Within a job (every 80 pages at full speed, every 40 pages at halfspeed.

During normal operation, the ADC sensor reads the density of patches on the accumulator belt to ensure that the machine is providing its best output. Based on the readings of these patches, the concentration of toner in the developer housings can be changed or laser power adjusted.

For example, if the customer ran a large number of images that contained a high concentration of yellow, the yellow developer housing would become somewhat depleted of yellow toner.

The machine would first notice this depletion as a patch on the accumulator belt that is less dense than the specifications allow, and due to the ATC Sensor’s indication.

In this situation, the machine would automatically tone up, adding more toner to the developer housing. The higher concentration of toner in the housing would then allow more toner to be developed out to the accumulator belt, and the patches would then start to become more dense. In this way, the system corrects itself when density becomes too low.

ADC Output Check

The ADC Sensor Assembly consists of 3 sensors that read values off the CMYK test patches. The "regular reflection", "diffusion" and "offset" sensors provide readings to the printer logic to determine if density is correct.

"ADC Output Check", in diagnostic mode, compares a target value in logic to the value seen by the individual sensors. If the value seen by the sensors is between -20 and +20 of the target value the printer density is correct.

If the test values shown below, displayed on the front panel, all equal zero, the test has detected no problems.

■ Result = 0

■ Stop Status = 0

■ ADC Sensor Fail = 0

■ ADC Shutter Fail = 0

If the "ADC Sensor Fail" test detects a problem, check the connector to the sensor. If the connector is OK, replace the sensor.

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Theory of Operation 2-27

If the ADC Shutter Fail test detects a problem, check the connector and the shutter for a binding or out of position condition. If these actions do not resolve the problem, replace the MOB Assembly.

If the following values all equal none, the test has detected no problems

■ LD Illum Warn = None

■ ADC Patch Fail = None

■ VBCR Warn = None

■ V Bias Warn = None

If Ave RADC Trans is within +/-20 of RADC Target, then printer logic assumes the density is correct. Values on the front panel are:

Front Panel Message Typical Values

[YMCK] RADC Target = [XXX] [YMC] 375-394 [K] 460

Ave RADC Trans = [within +/-20 of RADC Target] [YMC] 369-393 [K] 467

Ideal LD Ill = [XXX] [YMC] 335-361 [K] 394

V Bias = [XXX] 887

V BCR = 0 0

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2-28 Phaser 7750 Printer Service Manual

Lower Tray Feeders Sensor and Board Locations

7750-459

LTD Board (3T)HCF Board (TT)

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Theory of Operation 2-29

7750-462

3

4

5

3

4

5

Paper-Size Switch Assembly-Tray 3

Paper-Size Switch Assembly -Tray 4

-Tray 5

Paper-Size Switch Assembly -Tray 3-Tray 4-Tray 5

Take-Away Sensor

No-Paper Sensor/Level SensorTray 3Tray 4Tray 5

Tray 4 Take-Away SensorTray 5 Take-Away Sensor

Tray 4 Take-Away SensorTray 5 Take-Away Sensor

LTD

HCF

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2-30 Phaser 7750 Printer Service Manual

Paper feedsensor actuatortray 4

Paper feedsensor actuatortray 5

One wayclutchtray 3tray 4tray 5

Frictionclutchtray 3tray 4tray 5

Paper detectsensor actuatortray 3tray 4tray 5

Left hand coverinterlock switchactuator

One wayclutchtray 3tray 4

Left hand coverinterlock switchactuator

Paper detectsensor actuatortray 3tray 4

Frictionclutchtray 4

One wayclutchtray 5

Paper detectsensor actuatortray 5

Frictionclutchtray 5

7750-463

Frictionclutchtray 3

Paper sizeswitchactuatortray 4

Paper sizeswitchactuatortray 5

LTD

HCF

Page 67: Phaser 7750 Service Manual

3Chapter

Error Messages and Codes

In this chapter...■ Introduction

■ Overview for Troubleshooting Error Codes

■ System Startup and POST

■ Error Messages and Codes Index Table

■ Error Messages and Codes Procedures

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3-2 Phaser 7750 Printer Service Manual

Introduction

This section covers troubleshooting procedures for the Phaser 7750 printer front panel error messages and codes. Only jams and fatal errors will produce an associated numeric code. Error messages and codes are generally specific, making it important that service personnel and users record errors when reporting problems with the printer. Any code associated with an error message or jam can be viewed by pressing the INFO button and scrolling to the bottom of the help text displayed on the front panel.

Some procedures require performing service diagnostic tests to verify a specific printer part is operating correctly. For information on Service Diagnostics and all internal printer test functions, refer to "Service Diagnostics" on page 4-2.

To troubleshoot problems not associated with a front panel message or code, see "General Troubleshooting" on page 4-1.

When an error first occurs, record the error message and code then cycle power to the printer to see if the error recurs.

Always follow the safety measures detailed in the front of the manual when servicing the printer, see “Service Safety Summary” on page vii.

Accessing the Printer’s Error History

If an error message or code is not visible on the front panel, and the printer is still capable of printing, print one of the following pages from the printer’s front panel.

1. Engine Error History

a. Go to Troubleshooting ---> Service Tools --> Engine Error History and press OK.

2. Jam History

a. Go to Troubleshooting ---> Service Tools --> Jam History and press OK.

3. Service Usage Profile - For a definition of the numeric codes, see "Service Usage Profile Status Codes" on page A-5.

a. Go to Troubleshooting ---> Service Tools --> Service Usage Profile and press OK.

If the Printer is Unable to Print

If the printer is connected to a network and has a TCP/IP address, view the printer’s web page using a web browser.

1. Open a web browser.

2. Enter the printer’s IP address as the URL.

3. Select the Troubleshoot link and the fault history displays.

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Error Messages and Codes 3-3

Service Checklist

This checklist is an overview of the path a service technician should take to service the Phaser 7750 printer and it’s options.

Step 1: Identify the Problem:

1. Verify the problem reported by the customer.

2. Check for any error codes and write them down.

3. If the printer is capable of printing, print normal customer prints and service test prints to:

■ Make note of any print-quality problems in the test prints.■ Make note of any mechanical or electrical abnormalities present.■ Make note of any unusual noise or smell coming from the printer while printing.

4. Print a “Usage Profile”, if the printer is able to print and/or view the fault history under the Service Tools Menu.

5. Verify the AC input power supply is within proper specifications by measuring the voltage at the electric outlet while the printer is running.

Step 2: Inspect and Clean the Printer:

1. Switch OFF printer power and disconnect the AC power cord from the wall outlet.

2. Verify the power cord is free from damage and is connected properly.

3. Remove the Imaging Units and protect them from light.

4. Clean and inspect the printer interior and remove any foreign objects, dust or loose toner. Note: Use only a Toner Type II Vacuum.

Do not use solvents or chemical cleaners.Do not use any type of oil or lubricant on printer parts.Do not use compressed air.

5. Clean all rubber rollers with a lint-free cloth, dampened slightly with cold water and mild detergent.

6. Inspect the interior of the printer for damaged wires, loose connections, toner leakage, and damaged or obviously worn parts.

Step 3: Find the Cause of the Problem:

1. Use the Error Messages and Codes troubleshooting procedures to find the cause of the problem if an error code is reported.

2. Use Service Diagnostics to check printer parts.

3. Use the Wiring Diagrams and Plug/Jack Locator to locate test points and to take voltage readings at various test points as instructed in the appropriate Troubleshooting procedure.

Step 4: Correct the Problem:

1. Use the Parts List to locate a part number.

2. Use the Removal and Replacement procedures to replace the part.

Step 5: Final Check:

1. Test the printer to be sure you have corrected the initial problem and there are no additional problems present.

2. Perform RIP procedures.

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3-4 Phaser 7750 Printer Service Manual

Service RIP (Every Call) Procedures

These procedures are to be used for every service call.

1. Print an error log then diagnose and repair any problems as indicated.

2. Print a “Usage Profile” report, then diagnose and repair any problems as indicated.

3. Check the cleanliness of the interior and exterior of the printer including fans. Clean (dust or vacuum) these areas.

4. Check the versions of Engine and Postscript software. As appropriate, install the latest version of software.

5. Inspect the fuser assembly and clean if necessary.

6. Inspect the MOB and ADC sensors, clean if necessary.

7. Inspect the accumulator belt home sensor, clean if necessary.

8. Clean feed rollers and exit rollers only when dust or debris is visible.

9. Clean the laser scanner windows.

10. Review the proper operation of the printer with the customer emphasizing calibrate for paper, color calibration and setting the paper type correctly.

11. Have the customer make enough prints to verify any repairs that were done.

12. Review with the customer all work that was done.

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Error Messages and Codes 3-5

Overview for Troubleshooting Error Codes

Definition of the Chain-Link Codes

A chain-link is a numeric code represented as a pair with the chain first and the link second. The “chain” is a 2-digit identifier representing a major or higher level sub-assembly. The “link” is a 3-digit identifier representing a specific failure mode.

The chain-link is used to identify or address a specific component within the printer. The chain points to a counter or component assembly, and the link points to a specific item in that assembly.

All chain-link codes and their respective definitions can be found in the Appendix under "Missing Chain Link Codes Definitions" on page A-11.

Using the Troubleshooting Procedures

1. Each Step in a troubleshooting procedure instructs you to perform a certain action or test. The steps are to be followed in the order given until the problem is fixed or resolved.

2. The Actions and Questions box contains the procedures to perform and the resulting actions you must follow to isolate the problem.

■ When a procedure instructs you to test a component using service diagnostics, go to the "Service Diagnostic Tests Table" on page 4-3 for a detailed description for testing printer components.

■ Troubleshooting procedures may ask you to take voltage readings or test for continuity at certain test points within the printer. For detailed diagrams, see "Wiring Diagrams" on page 10-1 for complete information on test point locations and signal names.

3. The Actions are followed by a Question. If your response to the question is “Yes”, then follow the instructions for the “Yes” reply. If your response to the question is “No”, then follow the instructions for the “No” reply.

4. The problem will be isolated to an adjustment, calibration or a printer component that needs replacement, see the following chapters for more information.

■ Chapter 6 "Adjustments and Calibrations" on page 6-1.

■ Chapter 8 "Service Parts Disassembly" on page 8-1 provides detailed steps for removing and replacing all major parts of the printer.

■ Chapter 9, "Service Parts Lists" on page 9-1 details the location, quantity and part number for all spared parts of the printer.

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3-6 Phaser 7750 Printer Service Manual

General Notes on Troubleshooting

1. Unless indicated otherwise, the instruction “turn ON printer power” means for you to switch ON the printer power and let the printer proceed through POST to a ‘Ready’ condition.

2. When instructed to take resistance readings between “P/J 232 <=> P/J 210” (without specified pin numbers), check all pins. See "Wiring Diagrams" on page 10-1 for the location of all wiring harnesses and pins.

3. When you are instructed to take a voltage reading, the black probe (–) is generally connected to a pin that is either RTN (Return) or SG (Signal Ground). You can substitute any RTN pin or test point in the printer, and you can use FG (frame ground) in place of any SG pin or test point.

4. Before measuring voltages, make sure the printer is switched ON, the imaging units and the paper trays are in place, and the interlock switches are actuated, unless a troubleshooting procedure instructs otherwise. Before measuring continuity or resistance, make sure the printer is switch OFF.

5. All voltage values given in the troubleshooting procedures are approximate values. The main purpose of voltage readings is to determine whether or not a component is receiving the correct voltage value from the power supply and if gating (a voltage drop) occurs during component actuation.

6. When a troubleshooting procedure instructs you to replace a non-spared component and that component is part of a parent assembly, replace the entire parent assembly.

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Error Messages and Codes 3-7

System Startup and POST

System Boot Sequence

1. When the main power switch is turned on, the ‘health’ LED on the image processor board turns on immediately.

2. The boot loader checks for RAM present and functional. If not, it posts a very large “RAM ERROR” on the front panel and blinks the LED 1/2 second on/off continuously.

3. The boot Loader then runs POST diagnostics.

4. POST turns off the health LED.

5. POST checks the front panel.

6. If buttons have been pushed, the front panel displays “Processing Input”.

7. The front panel LED cycles: Green, Yellow, Red, and then off.

8. The front panel turns on, the LED turns Green, and the POST tests are run.

Power On Self Test (POST)

The following tests are performed when the printer is powered on, after the boot loader runs, and before the operating system is loaded and initialized.

POST diagnostics are intended to provide a quick means of isolating a defective subsystem associated with the image processor board and SDRAM. POST returns control to the boot loader and the operating system is loaded. The operating system then loads the imaging processing software. If POST detected any soft errors, a message is printed in a red box on the start page. If POST detects any hard errors, both the front panel and ‘health’ LED blink the error code pattern, see "POST Fault Reporting LED Blink Patterns" on page 3-8.

POST Startup indications

■ At power-on the hardware default is to turn on the IP board ‘health’ LED.

■ The image processor board ‘health’ LED is turned off.

■ The front panel display is reset (addressable area becomes “gray”).

■ The Green LED turns on for 1/3 second.

■ The Yellow LED turns on for 1/3 second.

■ The Red LED turns on for 1/3 second.

■ The front panel LED is turned off.

■ The backlight is turned on (high intensity), with nominal contrast display.

■ The front panel display area is turned on, dark black for 1 second.

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3-8 Phaser 7750 Printer Service Manual

■ The front panel display is cleared.

■ The backlight is turned on with nominal intensity.

■ The POST Vn.nn message appears, and tests are quickly executed.

■ If any tests fail, the front panel screen freezes with the name of the test displayed and the line posted is “Call Customer Service”.

■ After the POST tests have finished running, the Xerox ‘splash screen’ is posted to the front panel and PostScript begins initialization.

POST Faults

There are two kinds of faults: soft and hard.

A soft fault is any fault that is discovered by POST, but does not prevent the operating system from initializing and becoming available as a tool for troubleshooting. These POST faults do not stop execution and are reported on the StartPage in a red box after the system is running.

A hard fault is any fault discovered by POST that prevents the operating system from initializing successfully. A hard fault prevents the system from further execution and is halted with blinking LEDs (front panel and health LED). The test name of the test that failed is displayed on the front panel.

Hard Fault Reporting Devices

■ The health LED flashes according to the fault code.

■ A Vx Works text string is printed out the serial port.

■ The front panel LED flashes in unison with the health LED.

■ The last fault message posted to the front panel is present.

NoteAll soft faults are printed on the Startup Page.

POST Fault Reporting LED Blink Patterns

For faults identified as hard faults, the POST firmware causes the PS ‘health’ LED and front panel LED, to blink in a particular pattern to identify the fault. There are short and long blinks. A long blink is worth 5 and a short blink is worth 1. If a fault blink pattern is flashed as long, long, short, short, this is fault code 5+5+1+1=12, which indicates a failure in the CPU interrupt test.

The exception to the above pattern is a RAM test error. The RAM tests have a special blink pattern and the front panel displays “RAM Error”. During power up the front panel LED is on. If the RAM tests fail, the image processor board ‘health’ LED is turned off, and the front panel LED is red. At 1/2-second intervals, the ‘health’ LED and the front panel LED toggle continuously.

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Error Messages and Codes 3-9

POST Diagnostic Test Descriptions

Test Fault Type

Fault Code Description

SDRAM Hard 1

This test fails if the boot loader finds no RAM present or faulty RAM.Boot loader posts the message “RAM error” to the front panel and blinks the front panel LED and IP Board health LED.

Local Bus/ Front Panel Hard 2

Performed during the POST firmware initialization phase. If the front panel is unplugged, a hard fault is indicated by the heath LED.

I/O ASIC Hard 3 This test determines if the I/O chip is functioning properly.

MEM Hard 4 This test determines if the memory access function works at selected addresses

Configuration Chip Hard 5

This test checks to see if the configuration chip is present. If no chip is present the test fails and the front panel message “Please Install configuration chip displays.

EEPROM Hard 10 This test checks addressing of the EEPROM.

Ethernet Hard 11 This test checks the ethernet core.

CPU Interrupts Hard 12 This test checks that each interrupt source to the CPU is functioning.

USB Hard 13 This test checks that the USB core is functioning properly.

Real Time Clock Soft 14

The real time clock is tested.

RAM DIMM Presence Soft 15

This test examines bad or incompatible RAM DIMMs.

Min RAM Limits Soft 16 Checks that there is at least 128 MB installed and ignores more than 512 MB.

Max RAM Limits Soft 17

Checks to ensure no more than 1 GB of RAM is installed.

IDE Disk Soft 20 Checks the disk controller core, and runs a DIAGNOSE command on the hard drive.

CPU Fan Hard 24 Checks hardware to see if a failure of the CPU cooling fan has occurred.

Cage Fan Hard 25 Checks hardware to see if a failure of the electronics cooling fan has occurred.

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3-10 Phaser 7750 Printer Service Manual

Error Messages and Codes Index Table

Code Error Message Chain-Link Page

10 Laser Unit Failure 06-38006-38106-38206-38306-385

pg. 3-12

11 Laser Unit Polygon Motor Failure 06-372 pg. 3-12

12 Yellow ATC Sensor Failure 09-380 pg. 3-13

13 Magenta ATC Sensor Failure 09-381 pg. 3-13

14 Cyan ATC Sensor Failure 09-382 pg. 3-13

15 Black ATC Sensor Failure 09-383 pg. 3-15

20 Transfer Roller Contact Failure 09-342 pg. 3-17

21 Transfer Roller Retract Failure 09-343 pg. 3-17

1st BTR Contact Failure 09-348 pg. 3-18

1st BTR Retract Failure 09-349 pg. 3-18

30 Accumulator Belt Home Position Took Too Long 04-346 pg. 3-19

31 Accumulator Belt Home Position Failure 04-347 pg. 3-19

32 Accumulator Belt Edge Sensor Failure 04-348 pg. 3-22

33 Unexpected Accumulator Belt Home Sensor Signal 09-350 pg. 3-24

34 Accumulator Belt Drive Logic Failure 09-351 pg. 3-22

35 Fuser Main Lamp Failure 10-348 pg. 3-25

41 Install or Reseat Fuser 10-349 pg. 3-26

42 Fuser STS (front) Warm Time Failure 10-352 pg. 3-27

43 Fuser SSR1 On Time Failure 10-353 pg. 3-27

44 Fuser Sub Lamp Failure 10-350 pg. 3-29

45 Fuser STS (rear) Failure 10-351 pg. 3-30

46 Fuser STS (rear) Warm Time Failure 10-354 pg. 3-31

47 Fuser SSR2 On Time Failure 10-356 pg. 3-31

48 Fan Failure 10-398 pg. 3-33

60 Imaging Unit Motor Failure, Code 60 04-361 pg. 3-35

70717273

Imaging Unit 1...2 3 4... Communication Failure

09-36009-36109-36209-363

pg. 3-36

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Error Messages and Codes 3-11

Black Imaging Unit Motor Failure 04-363 pg. 3-37

78 Waste Cartridge Full Detection Sensor Failure 09-358 pg. 3-38

80 Engine Logic Board Failure 04-34104-343

pg. 3-39

81 Controller To Engine Communication Failure 04-358 pg. 3-39

82 Engine Logic Board RAM/ROM Failure 04-34004-342

pg. 3-39

83 Engine Logic Board NVRAM Failure 04-362 pg. 3-40

84 Controller to Engine Logic Board Timing Failure 04-371 pg. 3-40

85 Engine Logic Board Micro Pitch Failure 04-344 pg. 3-40

86 High-Voltage Power Supply Failure 04-345 pg. 3-40

87 Tray Lift Failure 07-28107-28207-28307-28407-29107-29207-397

pg. 3-41

88 Lower Tray Communication Failure 7-250 pg. 3-44

MPT Size Sensor Broken 7-274 pg. 3-43

The following Error Codes and Messages are associated with the optional Finisher:

111 Finisher Stapler Move Sensor On Failure 12-241 pg. 3-47

112 Finisher Stapler Move Sensor Off Failure 12-242 pg. 3-47

113 Finisher Stapler Failure 12-244 pg. 3-49

114 Finisher Front Tamper Home Sensor Failure 12-252 pg. 3-51

115 Finisher Rear Tamper Home Sensor Failure 12-253 pg. 3-52

116 Finisher Stacker Height Sensor Off Failure 12-254 pg. 3-53

117 Finisher Stacker Tray Failure 12-255 pg. 3-55

118 Finisher Stapler Front Corner Sensor On Failure 12-256 pg. 3-57

119 Finisher Stapler Front Corner Sensor Off Failure 12-257 pg. 3-57

120 Finisher Eject Clamp Home Sensor On Failure 12-260 pg. 3-58

121 Finisher Eject Clamp Home Sensor Off Failure 12-262 pg. 3-58

122 Finisher Decurler Failure 12-267 pg. 3-59

123 Finisher Set Clamp Failure 12-281 pg. 3-60

124 Finisher Communication Failure 12-350 pg. 3-61

125 Finisher Staple Mode Logic Failure 12-399 pg. 3-61

Code Error Message Chain-Link Page

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3-12 Phaser 7750 Printer Service Manual

Error Messages and Codes Procedures

Laser Unit Failure, Code 10Laser Unit Polygon Motor Failure, Code 11

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

Applicable Parts Wiring and Plug/Jack Map Diagrams

■ Laser Assembly ■

■ Engine Control Board ■

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Remove the rear cover from the printer.

2. Disconnect P401 and P402 from the Engine Control Board.

3. Carefully reinsert the plugs into their joint socket and FIRMLY seat them.

4. Did this fix the problem?

Complete. Replace the laser unit.(You must perform the RegiCon Adjustment after replacing the laser unit.)

If the problem persists, replace the engine control board.

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Error Messages and Codes 3-13

Yellow ATC Sensor Failure, Code 12Magenta ATC Sensor Failure, Code 13Cyan ATC Sensor Failure, Code 14

The ATC Sensor detects an insufficient amount of developer.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

Applicable Parts Wiring and Plug/Jack Map Diagrams

■ ATC Sensor and Harness ■

■ Engine Control Board ■

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is the problem toner and/or developer empty.

Replace the toner or developer.

Go to step 2.

2 Is the ATC sensor clean and free of dust, toner or any other contaminates?

Go to step 3. Clean the ATC sensor.

3 1. Check the ATC sensor wiring harness Yellow = P/J129Magenta = P/J 130Cyan = P/J 131

2. Is the wiring harness or the sensor defective?

Replace the ATC Sensor and/or wiring harness.

Go to step 4.

4 1. Remove the Rear Cover and Rear Shield.

2. Measure the voltage at...Yellow = P405B3 Magenta = P405B8Cyan = P405A10on the engine control board.

3. Is the voltage between +1 and +3 VDC?

Replace the engine control board.

Go to step 5.

5 1. Measure the voltage at...Yellow = P405B14 Magenta = P405B11Cyan = P405A11on the engine control board.

2. Is the voltage +5 VDC?

Replace the engine control board.

Go to step 6.

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3-14 Phaser 7750 Printer Service Manual

6 1. Measure the voltage at... Yellow = P405B2Magenta = P405B9Cyan = P405A9on the engine control board.

2. Is the voltage 0 VDC?

Replace the engine control board.

Go to step 7.

7 1. Remove the Imaging Unit Plate cover.

2. Inspect the wiring harness between the engine control board and the developer housing assembly.

3. Is the wiring harness defective?

Replace the wiring harness.

Replace the ATC Sensor.

8 Run approximately 10 pages of the solid fill full-page prints for this color to ensure the error is cleared.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

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Error Messages and Codes 3-15

Black ATC Sensor Failure, Code 15

The ATC Sensor detects an insufficient amount of developer.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.If this error is intermittant, replace the black developer clutch.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ ATC Sensor and Harness

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is the black toner and/or developer empty? Replace the toner or developer.

Go to step 2.

2 Is the ATC sensor clean and free of dust, toner or any other contaminates?

Go to step 3. Clean the ATC sensor.

3 1. Check the ATC sensor wiring harness (P/J132).

2. Is the wiring harness or the sensor defective?

Replace the ATC Sensor and/or wiring harness.

Go to step 4.

4 1. Remove the rear cover and rear shield.

2. Measure the voltage at P405A3 on the engine control board.

3. Is the voltage between +1 and +3 VDC?

Go to step 5. Replace the engine control board.

5 1. Measure the voltage at P405A4 on the engine control board.

2. Is the voltage +5 VDC?

Go to step 6. Replace the engine control board.

6 1. Measure the voltage at P405A2 on the engine control board.

2. Is the voltage 0 VDC?

Go to step 7. Replace the engine control board.

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3-16 Phaser 7750 Printer Service Manual

7 1. Remove the imaging unit plate cover.

2. Inspect the wiring harness between the engine control board and the developer housing assembly.

3. Is the wiring harness defective?

Replace the wiring harness.

Replace the ATC sensor.

8 Run approximately 10 pages of the solid fill full-page prints for this color to ensure the error is cleared.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 83: Phaser 7750 Service Manual

Error Messages and Codes 3-17

Transfer Roller Contact Failure, Code 20Transfer Roller Retract Failure, Code 21

The Transfer Roller did not meet the contact position, or the Transfer Roller did not reach the retract position.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Left Door

■ Retract Home Sensor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and run the 2nd BTR Motor test.

2. Does the motor operate correctly?

Go to step 2. Go to step 5.

2 1. Clean the 2nd BTR retract sensor.

2. Does the error still occur?

Go to step 3. Complete.

3 1. Use service diagnostics transmissive sensor test.

2. Does the sensor operate correctly?

Go to step 4. Replace the sensor or left hand door assembly.

4 1. Check the transfer roller transmission gears for damage.

2. Are the gears damaged?

Replace the left hand door assembly.

Go to step 6.

5 1. Remove the left-hand rear mid cover.

2. Inspect the left-hand cover assembly wiring harness for damage and ensure the connectors are all properly seated.

3. Is the wiring harness damaged?

Replace the left-hand cover assembly.

Go to step 6.

6 1. Remove the rear cover and rear shield.

2. Reconnect power and enter service diagnostics.

3. Measure the voltage at the engine control board J533B9 while running the 2nd BTR Motor test several times.

4. Does the voltage toggle between +5 VDC and 0 VDC when the test is running?

Replace the engine control board.

Replace the transfer roller retract sensor.

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3-18 Phaser 7750 Printer Service Manual

1st BTR Contact or Retract Failure

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Retract Sensor and Harness

■ Accumulator Belt Assembly

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is the retract sensor or actuator damaged or out of position?

Repair or reseat the sensor.

Go to step 2.

2 1. Run the 1st BTR motor contact/retract test in diagnostics.

2. Do the 1st BTRs contact and retract?

Replace the accumulator belt assembly.

Go to step 3.

3 1. Run the 1st BTR retract sensor test.

2. Does the status change between H and L?

Go to the transmissive sensor procedure.

Replace the accumulator belt assembly.

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Error Messages and Codes 3-19

Accumulator Belt Home Position Took Too Long, Code 30Accumulator Belt Home Position Failure, Code 31

The accumulator belt home sensor did not detect the belt home signal.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

CautionIf the accumulator belt is damaged, determine the cause of the damage before installing a new assembly.

■ Visually inspect the accumulator belt area inside the printer and inside the left hand door for foreign objects or damaged parts.

■ Inspect the belt steering mechanism to determine if it is operable.

■ It may be necessary to query the user for additional information as to likely causes.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Belt Cleaner

■ Accumulator Belt Motor

■ Waste Toner■ Auger Assembly■ Interface board■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Have the accumulator belt shipping restraints been completely removed?

Go to step 2. Remove the restraints.

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3-20 Phaser 7750 Printer Service Manual

2 1. Enter service diagnostics and run the Clear Tech Rep Fault (see pg. 6-20) 04-346 procedure.

2. Enter the Adjustments/Calibrations menu and run the Belt Edge Learn Test with the right hand door open and the door interlock held actuated.

3. Does the accumulator belt rotate during the test?

Go to step 3. Go to step 6.

3 1. Remove the accumulator belt assembly.

Caution: Removing the accumulator belt assembly allows light into the imaging unit area, avoid exposing the imaging units to light.

2. Is the belt home marker present?

This is a 7 mm, square, silver patch on the rear edge, inside the belt. Rotate the belt if you cannot see the marker.

Go to step 4. Replace the accumulator belt assembly.

4 1. On the accumulater belt assembly, rotate the belt drive gear in the normal process direction until the belt home marker is positioned beneath the belt home sensor.

2. Reinstall the belt assembly.

3. Enter service diagnostics and run the Accum MOB Sensor test.

4. Is “MOB sensor is H” displayed?

Replace in the following order:

■ engine control interface board■ engine control board

Go to step 5.

5 1. Replace the accumulator belt assembly.

2. Retest.

3. Does error 30 return?

Troubleshoot and repair using the Reflective Sensor Procedure on pg. 3-45.

Complete.

6 1. Partially remove the accumulator belt assembly.

2. Manually rotate the drive gear clockwise.

3. Does the belt turn freely?

Go to step 14. Go to step 7.

7 1. Inspect the a.ccumulator belt cleaner and waste auger for packed toner.

2. Are the belt cleaner and auger clean and free of toner?

3. Do the gears rotate freely?

Go to step 9. Go to step 8.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 87: Phaser 7750 Service Manual

Error Messages and Codes 3-21

8 1. Using a Type II Toner Vacuum, vacuum out the belt cleaner and waste auger.

2. Is the actuating lever broken off of the belt cleaner toner gate?

Replace the belt cleaner assembly.

Go to step 9.

9 1. Remove the waste toner cartridge.

2. Enter service diagnostics and run the Agitator Motor test.

3. Does the motor operate correctly?

Verify the waste toner cartridge is fully seated.Complete.

Go to step 10.

10 1. Check the voltage at J532A16 on the harness.

2. Is the voltage +24 VDC?

Go to step 12. Go to step 11.

11 1. Check the voltage at J43-12 on the harness.

2. Is the voltage +24 VDC?

Replace the engine control board.

Go to step 13.

12 1. Check the voltage at J532A17 on the harness.

2. Is the voltage +24 VDC?

Replace the engine control board.

Replace the waste toner agitator motor.

13 Is +24 VDC present at the low-voltage power supply board?

Troubleshoot the wiring between the +24 VDC LVPS and the Engine Control Board.

See "Troubleshooting the Low-Voltage Power Supplies" on page 4-17.

14 1. Remove the accumulator belt assembly.

2. Enter Service Diagnostics and run the Accum Belt Motor test.

3. Does the motor turn?

Diagnose and repair the mechanical condition binding the accumulator belt assembly.

Since the accumulator belt drive motor is a servo motor, there are no voltage checks.This failure can be caused by 1 of 3 components. Replace and test in the following order:

■ motor■ interface board■ engine control board

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

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3-22 Phaser 7750 Printer Service Manual

Accumulator Belt Edge Sensor Failure, Code 32Accumulator Belt Drive Logic Failure, Code 34

CautionIf the Accumulator Belt is damaged, determine the cause of the damage before installing a new assembly.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Accumulator Belt Assembly

■ Engine Interface Board■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Remove the accumulator belt assembly.

2. Inspect the connector for damage.

3. Is the connector damaged?

Replace the accumulator belt assembly.

Go to step 2.

2 Is the edge sensor actuator touching the belt?

Replace the accumulator belt assembly.

Go to step 3.

3 1. Is the mating connector inside the printer damaged?

Repair or replace the wiring harness between the connector and J605.

Go to step 4.

4 1. Reinstall the accumulator belt assembly.

2. Enter service diagnostics and run the Belt Edge Sensor test.

3. Is the result OK?

Go to step 5. Run the Belt Edge Learn and recheck. If it still fails go to step 8.

5 1. Switch printer power ON.

2. Remove the rear cover and shield.

3. Measure the voltage between the engine control interface board and J533A11(+) and frame ground.

4. Does the voltage measure between +1 to +3 VDC?

Go to step 8. Go to step 6.

Page 89: Phaser 7750 Service Manual

Error Messages and Codes 3-23

6 1. Measure the voltage between the engine control interface board and J533A-9 and frame ground.

2. Does the voltage measure +5 VDC?

Go to step 7. Replace in the following order:

■ engine control interface board■ engine control board

7 1. Measure the voltage between the engine control interface board and J533A-10 and frame ground.

2. Does the voltage measure +5 VDC?

Replace in the following order:

■ engine control interface board■ engine control board

The edge sensor is defective, replace the accumulator belt assembly.

8 1. Remove the accumulator belt assembly.

2. Enter service diagnostics and run the Steering Motor test.

3. Does the motor turn?

Replace the accumulator belt assembly.If the problem is unresolved replace the engine control board.

Go to step 9.

9 1. Measure the voltage between the engine control interface board J550-5 and frame ground.

2. Is the voltage +24 VDC?

Go to step 10. Replace in the following order:

■ engine control interface board■ engine control board

10 1. Measure the voltage between the engine control interface board J550 Pins 1, 2, 3, 4 and frame ground.

2. Is the voltage +24 VDC?

Replace in the following order:

■ engine control interface board■ engine control board

Replace the steering drive assembly.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 90: Phaser 7750 Service Manual

3-24 Phaser 7750 Printer Service Manual

Unexpected Accumulator Belt Home Sensor Signal, Code 33

CautionIf the Accumulator Belt is damaged, determine the cause of the damage before installing a new assembly.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Accumulator Belt Assembly

■ Engine Control Interface Board■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Remove the accumulator belt assembly.

2. Inspect the DTS connector for damage.

3. Is the connector damaged?

Replace the accumulator belt assembly.

Go to step 2.

2 1. Is the mating connector inside the printer damaged?

Repair or replace the wiring harness between J605 and the connector.

Go to step 3.

3 1. Reinstall the accumulator belt assembly.

2. Enter service diagnostics and run the Accum MOB Sensor test.

3. Is the value H when the belt home marker is NOT under the belt home sensor?

Use the "Reflective Sensor Procedure" on page 3-45.

Replace in the following order:

■ engine control interface board■ engine control board

Page 91: Phaser 7750 Service Manual

Error Messages and Codes 3-25

Fuser Main Lamp Failure, Code 35

The lamp control circuit has failed resulting in the front thermistor detecting an overheat condition.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power and remove the fuser assembly and allow it to cool down.

2. Measure the resistance between the Fuser connector P600-4 and P600-6.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Go to step 4. Go to step 3.

3 1. Turn OFF printer power.

2. Measure the resistance between J641- 2 and J641-3 on the Engine Control Board.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 4. Repair or replace the wiring harness.

4 1. Turn printer power back ON.

2. Is there ~+3.4 VDC between J590-5 and ground?

Check the AC wiring harness to the fuser.If the check is OK, replace the AC drive assembly.

Replace the engine control board.

Page 92: Phaser 7750 Service Manual

3-26 Phaser 7750 Printer Service Manual

Install or Reseat Fuser, Code 41

Front thermistor open error. This is a cold condition.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power and remove the Fuser Assembly.

2. Measure the resistance between the fuser connector P600-4 and P600-6.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Replace the engine control board.

Go to step 3.

3 1. Turn OFF printer power.

2. Check for an open circuit or poor connection between J600-4 to J600-6 to J404A-2.

3. Is the wiring OK?

Replace the engine control board.

Repair or replace the wiring harness.

Page 93: Phaser 7750 Service Manual

Error Messages and Codes 3-27

Fuser STS (Front) Warm Time Failure, Code 42

Main heater warm-up error. The temperature did not reach the “Ready” temperature within the specified time.

Fuser SSR1 On Time Failure, Code 43

The main heater remained ON for more than the specified time.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power, remove the Fuser Assembly and allow it to cool down.

2. Measure the resistance between the Fuser connector P600-4 and P600-6.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Measure the resistance between fuser connector P600-1 and P600-12.

2. Does the resistance measure 20 Ohms or less?

Go to step 3. Replace the fuser assembly.

3 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Go to step 5. Go to step 4.

4 1. Turn OFF the printer power.

2. Check for an open circuit or poor connection between J641-2 and J404A-2.

3. Is the wiring OK?

Replace the engine control board.

Repair or replace the wiring harness.

Page 94: Phaser 7750 Service Manual

3-28 Phaser 7750 Printer Service Manual

5 Is the line voltage present at FS41 on the AC Drive Board?

Go to step 6. Go to step 7.

6 1. Check the wiring harness between FS41 and J600-1 for an open circuit or poor connection.

2. Is the wiring harness OK?

Replace the fuser assembly.

Replace the AC power chassis assembly.

7 Check for +5 VDC at P/J 590-5 on the AC Drive Board.

Go to step 8. Replace the engine control board.

8 Check for +24 VDC at P/J 590-1 on the AC Drive Board.

Replace the AC power chassis assembly.

Replace the fuser assembly.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 95: Phaser 7750 Service Manual

Error Messages and Codes 3-29

Fuser Sub Lamp Overheat Failure, Code 44

The front thermistor has detected an overheat condition.

NoteIf this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg. 6-20) is performed.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power, remove the fuser assembly and allow it to cool down.

2. Measure the resistance between the Fuser connector P600-7 and P600-9.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Go to step 4. Go to step 3.

3 1. Turn OFF printer power.

2. Measure the resistance between J641-4 and J641-5 on the engine control board.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 4. Repair or replace the wiring harness.

4 1. Turn printer power back ON.

2. Is there ~+3.4 VDC between J590-3 and ground?

Check the AC wiring harness to the fuser.If the check is OK, replace the AC drive assembly.

Replace the engine control board.

Page 96: Phaser 7750 Service Manual

3-30 Phaser 7750 Printer Service Manual

Fuser STS (Rear) Failure, Code 45

Rear Thermistor open error. The machine logic detected an open circuit in the rear thermistor.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power, remove the fuser assembly and allow it to cool down.

2. Measure the resistance between the Fuser connector P600-7 and P600-9.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Replace the engine control board.

Go to step 3.

3 1. Turn printer power OFF.

2. Check for an open circuit or poor connection between J641-4 and J641-5.

3. Is the wiring harness OK?

Replace the engine control board.

Repair or replace the wiring harness.

Page 97: Phaser 7750 Service Manual

Error Messages and Codes 3-31

Fuser STS (Rear) Warm Time Failure, Code 46

Sub-heater warm-up error. The temperature did not reach “Ready” temperature within the specified time.

Fuser SSR2 On Time Failure, Code 47

The Sub-heater remained ON for more than the specified time.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Turn OFF power, remove the fuser assembly and allow it to cool down.

2. Measure the resistance between the Fuser connector P600-7 and P600-9.

3. Does the resistance measure between 30 K and 190 K Ohms?

Go to step 2. Replace the fuser assembly.

2 1. Measure the resistance between fuser connector P600-3 and P600-12.

2. Does the resistance measure 20 Ohms or less?

Go to step 3. Replace the fuser assembly.

3 1. Reinstall the fuser assembly.

2. Enter service diagnostics.

3. From the Sensor Tests run the Fuser Temperature test.

4. Is the temperature indicated

approximately 165o C?

Go to step 5. Go to step 4.

4 1. Turn printer power OFF.

2. Check for an open circuit or poor connection between J641-4 and J641-5.

3. Is the wiring harness OK?

Replace the engine control board.

Repair or replace the wiring harness.

Page 98: Phaser 7750 Service Manual

3-32 Phaser 7750 Printer Service Manual

5 1. Is line voltage present at FS47 on the AC drive board?

Go to step 6. Go to step 7.

6 1. Check the wiring harness between FS47 and J600-1 for an open circuit or poor connection.

2. Is the wiring harness OK?

Replace the fuser assembly.

Replace the AC power chassis assembly.

7 1. Check for +5 VDC at P/J 590-3 on the AC drive board.

Go to step 8. Replace the engine control board.

8 1. Check for +24 VDC at P/J 590-1 on the AC drive board.

Replace the AC power chassis assembly.

Replace the fuser assembly.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 99: Phaser 7750 Service Manual

Error Messages and Codes 3-33

Fan Failure, Code 48

The machine logic detected a failure of the Fuser fan, LVPS fan, or rear fan.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Fuser Fan

■ LVPS Fan

■ Rear Fan

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and run the fan test.

2. Does the fuser fan rotate at a high speed?

Go to step 4. Go to step 2.

2 1. Check for voltage at J222-4.

2. Does the voltage measure +24 VDC?

Go to step 3. Check the wiring to the fuser fan, if the wiring is OK, replace the engine control board.

3 Does the front panel indicate the fans are ON?

Replace the fan. Check the wiring to the fuser fan, if the wiring is OK, replace the engine control board.

4 Does the rear fan revolve at high speed? Go to step 7. Go to step 5.

5 1. Check for voltage at J552-1.

2. Does the voltage measure +24 VDC?

Go to step 6. Check the wiring to the rear fan, if the wiring is OK replace the interface board. If the problem continues, replace the engine control board.

Page 100: Phaser 7750 Service Manual

3-34 Phaser 7750 Printer Service Manual

6 Does the front panel indicate the fans are ON?

Replace the rear fan.

Check the wiring tot he rear fan, if the wiring is OK, replace the engine control board.

7 Does the LVPS fan revolve at high speed? The fans are operating correctly. If the problem persists, replace the engine control board.

Go to step 8.

8 1. Check for voltage at J214-4.

2. Is +24 VDC present?

Go to step 9. Check the wiring to the LVPS fan, if the wiring is OK, replace the engine control board.

9 Does the front panel indicate the fans are ON?

Replace the LVPS assembly.

Check the wiring to the LVPS fan, if the wiring is OK, replace the engine control board.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 101: Phaser 7750 Service Manual

Error Messages and Codes 3-35

Imaging Unit Motor Failure, Code 60

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Imaging Unit Drive Motor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and run the Imaging Unit Motor test.

2. Does the motor operate correctly?

Go to step 7. Go to step 2.

2 1. Is the voltage at J210-5 +5 VDC? Go to step 3. Replace the engine control board.

3 1. Is the voltage at J210-7 +24 VDC? Go to step 4. Use the +24 VDC wirenets to troubleshoot and resolve the missing voltage.

4 1. Enter service diagnostics.

2. While running the Imaging Unit Motor test, check the voltage at J210-1 and J210-2.

3. Is the voltage 0 VDC while the test is running?

Go to step 5. Replace the engine control board.

5 Is the frequency between J210-4 and ground between 1 KHz and 1.3 KHz?

Replace the imaging unit drive motor.

Go to step 6.

6 1. Check for a short to ground at J210-4.

2. Is the wire grounded?

Repair or replace the wiring harness.

Replace the engine control board.

7 1. Enter service diagnostics.

2. While running the Imaging Unit Motor test, check the voltage at J210-9.

3. Is the voltage +5 VDC while the test is running?

Replace the imaging unit drive motor.

Replace the engine control board.

Page 102: Phaser 7750 Service Manual

3-36 Phaser 7750 Printer Service Manual

Imaging Unit [1] [2] [3] [4] Communications Failure, Code 70, 71, 72, 73

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Imaging Unit

■ Imaging Unit Plate Assembly

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Replace the imaging unit reporting the error.

2. Does the error still appear?

Go to step 2. Complete.

2 1. Remove the imaging unit from the problem location and inspect the connector.

2. Is the connector damaged?

Replace the imaging unit plate assembly.

Troubleshoot the wiring. If wiring is OK, replace the engine control board.

Page 103: Phaser 7750 Service Manual

Error Messages and Codes 3-37

Black Imaging Unit Motor Failure

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Imaging Unit Motor

■ Engine Control Interface Board■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Run the Black Imaging Unit Motor test from diagnostics. Does the motor operate correctly?

Go to step 7. Go to step 2.

2 Is the voltage at J235-4 +5 VDC? Go to step 3. Use wirenet 8.2 to troubleshoot the missing +5 VDC.

3 Is the voltage at J235-1 +24 VDC? Go to step 4. Use wirenet 8.2 to troubleshoot the missing +24 VDC.

4 Run the Black Imaging Unit Motor test from diagnostics. Is the voltage at J235-5 0 VDC with the test running?

Go to step 5. Use wirenet 8.2 to troubleshoot.

5 Is the frequency at J235-8 between 1KHz and 1.3 KHz?

Replace the black imaging unit motor.

Go to step 6.

6 Is the frequency between J534A-2 and ground between 1 KHz and 1.3 KHz?

Check for an open circuit between J534A-8 and J235-8.

Replace in order until resolved:

■ engine interface board■ engine control board.

7 Is +3.3 VDC present at J534A-7 with the Motor test running from diagnostics?

If there is no mechanical bind in the black imaging unit, replace the black drum drive motor.

Use wirenet 8.2 to troubleshoot the missing +3.3 VDC.

Page 104: Phaser 7750 Service Manual

3-38 Phaser 7750 Printer Service Manual

Waste Cartridge Full Detection Sensor Failure, Code 78

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Waste Cartridge■ Waste Cartridge Full Sensor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Remove the waste cartridge sensor holder without disconnecting the harnesses.

2. Measure the voltage between the yellow wire on the waste cartridge full sensor and frame ground, alternately interrupting the sensor.

3. Does the voltage toggle between +5 and 0 VDC?

Go to step 5. Go to step 2.

2 1. Measure the voltage between the gray wire and frame ground.

2. Does the voltage measure +5 VDC?

Go to step 4. Go to step 3.

3 1. Remove the rear cover and rear shield.

2. Measure the voltage at J407B-17 on the engine control board.

3. Does the voltage measure +5 VDC?

Inspect the wiring harness for damage and replace, if necessary.

Replace the engine control board.

4 1. Measure the voltage between the violet wire and frame ground.

2. Does the voltage measure 0 VDC?

Replace the waste cartridge full sensor.

Inspect the wiring harness for damage and replace, if necessary.

5 1. Remove the rear cover and rear shield.

2. Measure the voltage at J407B-16 on the engine control board.

3. Alternately interrupt the sensor

4. Does the voltage toggle between +5 and 0 VDC?

Replace the engine control board.

Inspect the wiring harness for damage and replace, if necessary.

Page 105: Phaser 7750 Service Manual

Error Messages and Codes 3-39

Engine Logic Board Failure, Code 80

Controller to Engine Communications Failure, Code 81

Engine Logic Board RAM/ROM Failure, Code 82

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete Replace the engine control board or the image processor board.

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Turn the printer off.

3. Remove the Image processor board, IP board cover and metal cover.

4. Inspect the orange ribbon cable between the relay board and the engine control board.

5. Is the connector fully seated and free from damage?

Replace in the following order:

■ Image processor board■ Electrical chassis assembly■ Engine control board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete. Replace the engine control board.

Page 106: Phaser 7750 Service Manual

3-40 Phaser 7750 Printer Service Manual

Engine Logic Board NVRAM Failure, Code 83

Controller to Engine Logic Board Time Failure, Code 84

Engine Logic Board Micro Pitch Failure, Code 85

High-Voltage Power Supply Failure, Code 86

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete. Replace in the following order:

■ engine control board■ image processor board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete. Replace the engine control board.

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete. Replace in the following order:

■ engine control board■ image processor board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Cycle power to the printer to clear the error.

2. Did this clear the error?

Complete. Replace in the following order:

■ T3 HVPS■ image processor board

Page 107: Phaser 7750 Service Manual

Error Messages and Codes 3-41

Tray Lift Failure, Code 87

The tray level sensor does not detect that the tray has lifted. Examine the trays and paper feed assemblies for any physical damage before starting the troubleshooting procedure.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Tray Level Sensor■ Paper Select Switch Assembly■ Paper Feed Motor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is the problem with Tray 2? Go to step 2. Go to step 7.

2 1. Pull out and then reseat Tray 2.

2. Does the lift motor operate?

Go to step 3. Go to step 4.

3 1. Did the Error Code 87 clear from the front panel?

Complete. This could be an intermittent problem. If the problem returns, replace in order:

■ tray level sensor■ engine interface board

Replace the engine control board.

4 1. Using Service Diagnostics test the tray 2 Sensors.

2. Does the level indicate H?

Replace in order until resolved:

■ tray level sensor■ No paper sensor■ engine interface board■ engine control board

Go to step 5.

5 1. While still in diagnostics, pull out tray 2.

2. Does SW1-4: indicate LLLL?

Replace in order until resolved:

■ paper-select switch assembly■ engine interface board■ engine control board

Go to step 6

Page 108: Phaser 7750 Service Manual

3-42 Phaser 7750 Printer Service Manual

6 1. Reseat the paper tray.

2. Does SW1-4: indicate H in any position?

Replace the paper feed motor.

Replace in order until resolved:

■ paper-select switch assembly■ engine interface board■ engine control board

7 1. Pull out and then reseat the problem tray.

2. Listen for the motor, does the lift motor operate?

Go to step 8. Go to step 9.

8 1. Did the Error Code 87 clear from the front panel?

Complete. This could be an intermittent problem. If the problem returns, replace in order:

■ tray level sensor■ engine interface board

Replace the engine control board.

9 1. Using service diagnostics check the level sensor and no paper sensor.

2. Does the level indicate H?

Replace in order until resolved:

■ tray level sensor■ no paper sensor■ LTA or HCF control board■ engine interface board■ engine control board

Go to step 10.

10 1. While still in diagnostics, pull out tray 2.

2. Does SW(3,4,5)-4: indicate LLLL?

Replace in order until resolved:

■ paper-select switch assembly■ engine interface board■ engine control board

Go to step 11.

11 1. Reseat the paper tray.

2. Does SW(3,4,5,)-4: indicate H in any position?

Replace the paper feed motor.

Replace in order until resolved:

■ paper-select switch assembly■ engine interface board■ engine control board.

Troubleshooting Procedure

Step Actions and Questions Yes No

Page 109: Phaser 7750 Service Manual

Error Messages and Codes 3-43

Tray 1/MPT Size Sensor (7-274), Code?

An open circuit has been detected in the Paper Size Senor

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Tray 1/MPT Assembly

■ Engine Control Interface Board.■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is J610-2 between +0.15 and +3.1 VDC? Go to step 2. Go to step 3.

2 Is J532B-6 between +0.15 and +3.1 VDC? Replace in the following order:

■ engine control interface board.■ engine control board

Troubleshoot and repair the wiring harness between P/J 535 and P610.

3 Is +3.3 VDC present at J610-1? Replace the Tray 1/MPT assembly.

Go to step 4.

4 Is +3.3 VDC present at J532B-7? Troubleshoot and repair the wiring harness between P/J 535 and P610.

Replace in the following order:

■ engine control interface board.■ engine control board

Page 110: Phaser 7750 Service Manual

3-44 Phaser 7750 Printer Service Manual

Lower Tray Communication Failure, Code 88

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Engine Control Interface Board■ Tray module board■ Engine Control board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Is J668-1 on the tray module board +5 VDC?

Go to step 2. Use the wirenets to troubleshoot and repair the open wire.

2 Is J668-3 on the tray module board +24 VDC?

Go to step 3. Use the wirenets to troubleshoot and repair the open wire.

3 1. Check the following connectors for continuity:

■ P669-1 to J534A-15■ P669-2 to J534A-14■ P669-3 to J534A-13■ P669-4 to J534A-12■ P669-5 to J534A-11■ P669-6 to J534A-102. Do all checks indicate continuity?

Replace in the following order:

■ engine control interface board■ tray module board■ engine control board

Check and repair broken wires or bad connectors.

Page 111: Phaser 7750 Service Manual

Error Messages and Codes 3-45

Reflective Sensor Procedure

Refer to the figure below during this procedure..

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Reflective Sensor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and run the Reflective Sensor test.

2. Does the sensor change state from L to H when blocked?

Replace the sensor.

Go to step 2

2 1. Measure Pin 2 to ground.

2. Is there +5 VDC?

Go to step 4. Go to step 3.

3 1. Check the wire between Pin 2 and engine control board Pin 8 for an open circuit or poor contact.

2. Is the wiring OK?

Replace the board.

Repair or replace the wiring harness.

4 1. Is there +5 VDC between sensor Pin 1 and Pin 3?

Replace the sensor.

Go to step 5.

5 1. Is there +5 VDC between engine control board Pin 4 and Pin 5?

Go to step 6. Replace the engine control board.

6 1. Check the wiring to Pin 4 and sensor Pin 1 and Pin 5 to sensor Pin 3 for an open or poor circuit.

2. Is the wiring OK?

Replace the engine control board.

Replace the wiring harness.

7750-343

7 6CONTROLLOGIC

PWBPL

PWBPL

DC ROM

DC ROM

+5VDC

+5VDC

4

5

1

32

8

DOUBLEPLUG SENSOR

PL

J121

Page 112: Phaser 7750 Service Manual

3-46 Phaser 7750 Printer Service Manual

Transmissive Sensor Procedure

Refer to the following figure during this procedure.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Transmissive Sensor

■ Engine Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and run the Transmissive Sensor test.

2. Does the sensor change state from L to H when blocked?

Replace the sensor.

Go to step 2.

2 1. Remove the sensor connector.

2. Does the sensor now change state?

Replace the sensor.

Go to step 3.

3 1. Check for a short between sensor Pin 2 and engine control board Pin 8.

2. Is there a short?

Replace the wiring harness.

Go to step 4.

4 1. Is there +5 VDC between sensor Pin2 and ground?

Go to step 6. Go to step 5.

5 1. Check the wiring between sensor Pin 2 and engine control board Pin 8 for an open or poor circuit.

2. Is the wiring OK?

Replace the affected board.

Repair or replace the wiring harness.

6 1. Check the wiring to Pin 4 and sensor Pin 1 and Pin 5 to sensor Pin 3 for an open or poor circuit.

2. Is the wiring OK?

Replace the affected board.

Replace the wiring harness.

7750-342

7 6CONTROLLOGIC

PWBPL

DC ROM

DC ROM

+5VDC

+5VDC

4

5

3

12

8

DOUBLEPLUG SENSOR

PL

YEL

Page 113: Phaser 7750 Service Manual

Error Messages and Codes 3-47

Finisher Stapler Move Sensor On Failure, Code 111Finisher Stapler Move Sensor Off Failure, Code 112

Error Code 111: The staple move sensor did not turn ON within 2 seconds after the system has started to move to the staple position and the staple move sensor has turned off. Or, the staple move sensor did not turn on after the move to the staple position has completed.

Error Code 112: The staple move sensor does not turn OFF within 5 seconds after the move to the staple position has started. Or, the staple move sensor turned OFF after the staple position has been fixed. Or, the staple move sensor does not turn OFF within 5 seconds after it has turned ON when the paper passed through the 1st position of the dual staple, moving to the rear staple position.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Finisher Control Board

■ Staple Move Motor

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Manually move the staple head.

2. Does the head move smoothly from front to rear?

Go to step 2. Diagnose and repair the mechanical defect.

2 1. Enter service diagnostics and run the Stapler Move Sensor test.

2. Does the value change from L to H when the sensor is blocked?

Go to step 3. Use the Transmissive Sensor procedure to diagnose and repair the sensor.

3 1. Run the Stapler: Move Front or Move Rear test in diagnostics.

2. Does the stapler move motor run?

Replace the finisher control board.

Go to step 4.

4 Is +24 VDC present at P847 pins 1, 2, 5, and 6?

Replace in the following order:

■ stapler move motor■ finisher control board

Go to step 5

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3-48 Phaser 7750 Printer Service Manual

5 Is +24 VDC present at P847-4? Replace the finisher control board.

Troubleshoot the +24 VDC interlock circuit, using the "Troubleshooting the 24 VDC LVPS" on page 4-18.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 115: Phaser 7750 Service Manual

Error Messages and Codes 3-49

Finisher Stapler Failure, Code 113

The staple home sensor doesn’t turn ON within 2 seconds after the stapler motor started to turn backwards.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Finisher Control Board■ Staple Unit Assembly

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics.

2. Run the Stapler Home sensor test.

3. Does the value change from H to L when the stapler is moved away from the home position?

Go to step 6. Go to step 2.

2 1. Measure the voltage between finisher board connector P852-2 and frame ground.

2. Does the voltage change between 0 and +5 VDC when the sensor is blocked and unblocked?

Replace the finisher control board.

Go to step 3.

3 1. Measure the voltage at the Finisher Board connector P852-1.

2. Dose the voltage measure +5 VDC?

The home sensor or the wiring is bad. Replace the staple unit assembly.

Go to step 4.

4 1. Disconnect the Stapler Unit Assembly.

2. Measure the voltage between the finisher board connector P852-1 and frame ground.

3. Does the voltage measure +5 VDC?

Replace the stapler unit assembly.

Go to step 5.

5 Is +24 VDC present at either J847-7 or J847-9?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

6 1. Enter service diagnostics and run the “Stapler Close Motor” test.

2. Does the stapler motor operate correctly?

Replace the finisher control board.

Go to step 7.

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3-50 Phaser 7750 Printer Service Manual

7 With the Stapler Close Motor test running is +24 VDC present at J847-7?

Replace in the following order:

■ stapler head assembly■ finisher control board

Troubleshoot and repair the +24 VDC interlock circuit.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 117: Phaser 7750 Service Manual

Error Messages and Codes 3-51

Front Tamper Home Sensor Failure, Code 114

With the Front Tamper Home Sensor OFF the Front Tamper Home Sensor did not turn ON within 800 ms after the move to the Front Tamper Home position has begun.

With the Front Tamper Home Sensor on the Front Tamper Sensor did not turn Off when the Front Tamper Home Sensor is deactuated.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Front Tamper Motor

■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Run the Front Tamper Low Front or Front Tamper Low Rear test in diagnostics.

2. Does the front tamper guide operate?

Go to step 6. Go to step 2.

2 Does the front tamper motor operate? Check the tampering mechanism for a mechanical problem.

Go to step 3.

3 1. Check pins J877 A pins 1,3,4 and 6.

2. Is +24 VDC present on any of the pins?

Go to step 4. Go to step 5.

4 1. Check the following wires for and open circuit or short circuit to ground. Is any wire open or shorted?J877A-1 to J848B-7J877A-3 to J848B-9J877A-4 to J848B-10J877A-6 to J848B-12

Repair or replace the wiring harness.

Replace in order until resolved:

■ front tamper motor■ finisher control board

5 Is +24 VDC present on pins J848B-8 and J848B-11 on the finisher control board?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

6 1. Check the tamper front home sensor in diagnostics.

2. Does the value change from H to L when the tamper is moved away from the home position?

Replace the finisher control board.

Repair the sensor using the Transmissive Sensor troubleshooting procedure.

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Rear Tamper Home Sensor Failure, Code 115

With the Rear Tamper Home Sensor OFF the Rear Tamper Home Sensor did not turn On within 800 ms after the move to the Rear Tamper Home position has begun.

With the Rear Tamper Home Sensor on the Rear Tamper Sensor did not turn Off when the Rear Tamper Home Sensor is deactuated.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Rear Tamper Motor

■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Run the Rear Tamper Low Front or Rear Tamper Low Rear test in diagnostics.

2. Does the rear tamper guide operate?

Go to step 6. Go to step 2.

2 Does the rear tamper motor operate? Check the tampering mechanism for a mechanical problem.

Go to step 3.

3 1. Check pins J878A pins 1,3,4 and 6.

2. Is +24 VDC present on any of the pins?

Go to step 4. Go to step 5.

4 1. Check the following wires for and open circuit or short circuit to ground.

2. Is any wire open or shorted?

3. J878A-1 to J848B-1

4. J878A-3 to J848B-3

5. J878A-4 to J848B-4

6. J878A-6 to J848B-6

Repair or replace the wiring harness.

Replace in order until resolved:

■ rear tamper motor■ finisher control board

5 Is +24 VDC present on pins J848B-2 and J848B-5 on the finisher control board?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

6 1. Check the tamper rear home sensor in diagnostics.

2. Does the value change from H to L when the tamper is moved away from the home position?

Replace the finisher control board.

Repair the sensor circuit using the transmissive sensor troubleshooting procedure.

Page 119: Phaser 7750 Service Manual

Error Messages and Codes 3-53

Finisher Stacker Height Sensor Off Failure, Code 116

The Stack Height Sensor did not detect that the tray went down within 5 seconds after the Stacker Tray had been signaled to lower down at initialization. Or, the Stack Height Sensor did not detect the tray moving up within 5 seconds after the Stacker Tray had been signaled to lift.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Stacker Height Sensor/Actuator

■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Actuate the stacker height sensor in diagnostics.

2. Does the value change between H and L?

Go to step 2. Troubleshoot using the transmissive sensor procedure.

2 1. Run the Finisher Stacker Motor Down test in diagnostics.

2. Does the stacker tray lower?

Go to step 5. Go to step 3.

3 Does the stacker motor turn? Diagnose and repair the mechanical problem. Check the stacker motor gear, stacker tray, and belt track gear.

Go to step 4.

4 Is +24 VDC present at P/J 847-12 with the Finisher Stacker Motor Down test running in diagnostics?

Replace the stacker motor.

Replace the finisher control board.

5 1. Run the Finisher Stacker Motor Up test in diagnostics.

2. Does the stacker tray move up?

Replace the finisher control board.

Go to step 6.

6 Does the sacker motor turn? Diagnose and repair the mechanical problem. Check the stacker motor gear, stacker tray, and belt track gear.

Go to step 7.

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7 Is +24 VDC present at P/J 847-11 with the Finisher Stacker Motor Down test running in diagnostics?

Replace the stacker motor.

Replace the finisher control board.

Troubleshooting Procedure

Step Actions and Questions Yes No

Page 121: Phaser 7750 Service Manual

Error Messages and Codes 3-55

Finisher Stacker Tray Failure, Code 117

The system detected that the Stacker Tray Upper Limit Sensor was turned ON after the Stacker Tray began lifting up. Or the Stacker Tray Upper Limit Sensor remained on after the lowering down of the Stacker Tray was completed.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Stacker Motor

■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Actuate the stacker upper limit sensor in diagnostics.

2. Does the value change between H and L?

Go to step 2. Troubleshoot using the transmissive sensor procedure.

2 1. Run the Finisher Stacker Motor Down test in diagnostics.

2. Does the stacker tray lower?

Go to step 5. Go to step 3.

3 Does the stacker motor turn? Diagnose and repair the mechanical problem. Check the stacker motor gear, stacker tray, and belt track gear.

Go to step 4.

4 Is +24 VDC present at P/J 847-12 with the Finisher Stacker Motor Down test running in diagnostics?

Replace the stacker motor.

Replace the finisher control board.

5 1. Run the Finisher Stacker Motor Up test in diagnostics.

2. Does the stacker tray move up?

Replace the finisher control board.

Go to step 6.

6 Does the stacker motor turn? Diagnose and repair the mechanical problem. Check the stacker motor gear, stacker tray and belt track gear.

Go to step 7.

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7 Is +24 VDC present at P/J 847-11 with the Finisher Stacker Motor Down test running in diagnostics?

Replace the stacker motor.

Replace the finisher control board.

Troubleshooting Procedure (Continued)

Step Actions and Questions Yes No

Page 123: Phaser 7750 Service Manual

Error Messages and Codes 3-57

Finisher Stapler Front Corner On Failure, Code 118Finisher Stapler Front Corner Off Failure, Code 119

Error Code 118: The Staple Front Corner Sensor did not turn ON within 2 seconds after the system started to move to the Front Corner. Or the Staple Front Corner Sensor remained ON when starting the move to the Front Corner.

Error Code 119: The Staple Front Corner Sensor did not turn OFF within 2 seconds after starting to move from the Front Corner. Or the Staple Front Corner Sensor does not turn OFF after the move from the Front Corner was completed.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Finisher Control Board

■ Staple Move Motor

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Manually move the staple head.

2. Does the head move smoothly from front to rear?

Go to step 2. Diagnose and repair the mechanical defect.

2 1. Check the Stapler Front Corner Sensor in diagnostics.

2. Does the value change from L to H?

Go to step 5. Use the transmissive Sensor procedure to diagnose and repair the sensor.

3 1. Defeat the front door interlock switch then run the Stapler: Move Front or Move Rear motor test in diagnostics.

2. Does the stapler move motor run?

Replace the finisher control board.

Go to step 4.

4 Is +24 VDC present at P847-4? Replace the stapler move motor.

Go to step 5.

5 Is +24 VDC present at test point 9 on the finisher control board?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

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3-58 Phaser 7750 Printer Service Manual

Finisher Eject Clamp Home Sensor On Failure, Code 120 Finisher Eject Clamp Home Sensor Off Failure, Code 121

Error Code 120: The Eject Clamp Home Sensor did not turn ON within 5 seconds after the Eject Clamp Up was started.

Error Code 121: The Eject Clamp Home Sensor did not turn OFF within 2 seconds after the Eject Clamp Down was started.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Eject Motor

■ Finisher Control Board

Step Actions and Questions Yes No

1 1. Remove the Set Clamp Home Sensor Bracket from the Finisher while leaving the connector plugged in.

2. Check the Set Clamp home sensor in diagnostics.

3. Does the value change from H to L while blocking and unblocking the sensor?

Go to step 2. Use the transmissive Sensor procedure to diagnose and repair the sensor.

2 1. Reinstall the sensor in the Finisher. And turn the printer on.

2. Is the eject clamp up?

Replace the finisher control board.

Go to step 3.

3 1. Run the Eject Release Test in diagnostics.

2. Does the Eject Motor Run?

Diagnose and repair the mechanical problem with the eject clamp assembly.

Go to step 4.

4 1. Is +24 VDC present at P846-12? Replace the eject motor.

Go to step 5.

5 1. Is +24 VDC present at test point 9 on the finisher control board?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

Page 125: Phaser 7750 Service Manual

Error Messages and Codes 3-59

Finisher Decurler Failure, Code 122

The level of the Decurler Cam Home Sensor did not change 4 seconds after the Decurler Cam Clutch has turned on.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Decurler Cam Clutch

■ Stacker Motor■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Rotate the actuator while running the Decurler Cam Position test in diagnostics.

2. Does the value change between H and L?

Go to step 2. Troubleshoot using the transmissive sensor procedure.

2 Does the decurler cam clutch operate in diagnostics?

Check for a mechanical problem with the decurler cam clutch drive. If no problem is found replace the clutch.

Go to step 3.

3 Is +24 VDC present at P/J 849-1? Replace the decurler cam clutch.

Go to step 4.

4 Is +24 VDC present at test point 5 on the finisher control board?

Replace the finisher control board.

Troubleshoot the +24 VDC interlock circuit.

5 Is +24 VDC present at P/J 847-11 with the Finisher Stacker Motor Down test running in diagnostics?

Replace the stacker motor.

Replace the finisher control board

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3-60 Phaser 7750 Printer Service Manual

Finisher Set Clamp Failure, Code 123

The set clamp home sensor did not turn on within 2 seconds after the set clamp started operation.

Troubleshooting References

Applicable Parts Wiring and Plug/Jack Map References

■ Set Clamp Solenoid

■ Finisher Control Board

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Check the Set Clamp home sensor in diagnostics.

2. Does the value change from H to L while rotating the actuator?

Go to step 2. Use the transmissive Sensor procedure to diagnose and repair the sensor.

2 Does the solenoid energize when running the Set Clamp Paddle test in diagnostics?

Go to step 3. Go to step 4.

3 1. Run the Eject Forward Test and then the Eject Release Test in diagnostics.

2. Does the set clamp paddle turn once?

Replace the finisher control board.

Go to step 4.

4 Is +24 VDC present at P848A-10? Go to step 5. Go to step 6.

5 Is +24 VDC present at P848A-11? Replace the finisher control board.

Replace the set clamp solenoid.

6 Is +24 VDC present at test point 9 on the finisher control board?

Replace the finisher control board.

Troubleshoot and repair the +24 VDC interlock circuit.

Page 127: Phaser 7750 Service Manual

Error Messages and Codes 3-61

Finisher Communication Failure, Code 124

There are no diagnostic routines for problems involving serial communications. It is recommended that you address the following assemblies in this order:

■ Finisher Control Board

■ Engine Control Board

■ Perform continuity checks on any wiring harnesses involved.

Finisher Staple Mode Logic Failure, Code 125

There are no diagnostic routines for problems involving serial communications. It is recommended that you address the following assemblies in this order:

■ Stapler Assembly

■ Engine Control Board

■ Perform continuity checks on any wiring harnesses involved.

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3-62 Phaser 7750 Printer Service Manual

Page 129: Phaser 7750 Service Manual

4Chapter

General Troubleshooting

In this chapter...■ Introduction

■ Service Diagnostics

■ Front Panel Troubleshooting

■ Inoperable Printer Troubleshooting

■ Troubleshooting Power Supplies and Interlocks

■ Media Jams and the Paper Path

■ Operating System and Application Problems

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4-2 Phaser 7750 Printer Service Manual

Introduction

This chapter covers the general startup, PostScript, and power supply operations of the printer to aid in troubleshooting problems not associated with an error code or front panel error message.

For troubleshooting problems associated with an error code or front panel error message, see "Error Messages and Codes" on page 3-1.

Troubleshooting procedures isolate a problem to a specific component or subassembly, in some cases including the wiring harness.

Service Diagnostics

The Phaser 7750 Color Laser Printer has built-in diagnostics that allow access to sensors, turning on and off motors, clutches, solenoids, built-in test patterns, cleaning maintenance operations, printer status and some NVRAM access. Using these tests, the service technician should be able to diagnose problems quickly and isolate which component or sub assembly part needs replacement.

Service diagnostics are to be executed through the front panel by a certified service technician only. Service Diagnostics can be entered one of two ways:

Entering Service Diagnostics by Reboooting the Printer:

1. Turn the printer power OFF.

2. Hold down the Back and Information buttons simultaneously and turn the printer back ON.

3. Continue to hold the buttons until the following message is displayed on the front panel: Service Diagnostics V#.##, Initializing..., and then release the buttons.

4. The front panel displays the Service Diagnostics Menu.

■ You can print a Service Diagnostics Menu Map by highlighting Print Service Diagnostics Menu, and pressing OK.

■ The printer will now run through POST and return to Ready.

■ You will need to re-enter service diagnostics.

Entering hidden service menu without rebooting the printer

1. Scroll to the Troubleshooting --> Service Tools --> Printer Status Page menu.

2. Hold down the Up and Down buttons simultaneously.

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General Troubleshooting 4-3

Service Diagnostic Front Panel Button Descriptions

Service Diagnostic Tests Table

Button Function

BACK Returns to the prior higher level menu structure, if available. If help text is displayed on the front panel, pressing BACK restores the current menu item and remove the help text.

CANCEL Terminates the current test. Cancels current INFO display.

INFO Provides help information, if available.Pressing INFO again restores the current menu item and removes the help text.

UP Scrolls up one menu item within a menu list. This control does not ‘wrap’.Used to increment data in tests requiring user input.

DOWN Scrolls down one menu item within a menu list. This control does not ‘wrap’. The end of a menu list is designated by three asterisks.Used to decrement data in tests requiring user input.

OK Enters the highlighted menu. Executes the current test item. Used to select a data value entered by the user.

Test Front Panel Display Test Operation Definition

Print Service Menu Map Prints the Service Diagnostics Menu Page.

General Status Provides current print engine status.

Engine ROM Version Engine Version is xxx.x.xVideo ASIC Version: x.xx

Displays engine ROM version.

Configuration Options: {1TM | 3TM | HCF}{ +Duplexer } (nnn) Finisher}

Displays all optional components installed.

Ambient Temp/Humidity

Temperature is XXo C Humidity is XX %

Displays current printer temperature and humidity.

Fuser Temperature Front Temp is XXXo C

Back Temp is XXXo C

Displays current fuser temperature.

Fault List No Faults Detected | <nn,nnn> Fault Text

Power up only - current static condition, not a history log.

Front Panel Adjust Adjust Contrast?YesNoBacklight On?YesNo

Adjust Value: 1 - 15: 8 Default<Press UP/Down to Adjust.><Press OK to accept new value and exit.>

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4-4 Phaser 7750 Printer Service Manual

Jam Info No Static Jam DetectedorStatic Jam: area name

Location of Jam<Press Back or Cancel to exit.>

Fault History <nnn> text: mmm <nnn>: is a service defined numeric code, see "Service Usage Profile Status Codes" on page A-5 for code definitions.

text is the fault description.

mmm: is the fault count. The maximum fault count is 100 and rolls to 1 on overflow. All count values are 0 at power on.

Built-In Test Prints Prints pre-defined images stored in the engine firmware for troubleshooting image-quality problems.

Paper Path Options For Print Laser, check only: Selects tray, count of/continuous sheets, simplex/duplex, offset, media type/weight, finisher, staple.

Source tray: Tray 2-5, Tray1/ MPTYes No

Press Up/Down to change setting.

Current # sheets is nSelect new # sheets?YesNo

Press Up/Down to change the number.Press Info to shift column.

Simplex/Duplex:Change Duplex setting?YesNo

Press Up/Down to change setting.

Offset: None, Auto, Front, RearSet a new offset?YesNo

Press Up/Down to change setting.

Media Type: Set New Media Type?YesNo

Press Up/Down to change setting.

Output Destination Change Output Setting?YesNo

Press Up/Down to change setting.This option is only available with an optional finisher installed.

Stapling is: Set new stapling options?YesNo

Press Up/Down to change settingThis option is only available with an optional finisher installed.

Test Front Panel Display Test Operation Definition

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General Troubleshooting 4-5

Print Laser Check Fuser warming upLaser InitStartup | Imaging | Delivering | FinishingLaser Done

This is a quick test for all four laser colors, including developer and toner.All four primaries are present on the page. The print should appear grey.

Print Halftones HalfTones InitStartup | Imaging | Delivering | FinishingHalfTones Done

Prints 6 pages of 100% solid fill for; Yellow, Magenta, Cyan, Black, Red and Green.

Print Grid 1-dot Grid InitStartup | Imaging | Delivering | FinishingGrid Done

This print displays the four primary color lines in a grid pattern. See "RegiCon Adjustment Procedures" on page 6-5“.

Print Fast Scan 8 Tone

Scan InitStartup | Imaging | Delivering | FinishingScan Done

Prints four pages of eight tones for each primary color. Note: Use SEF to see all scans.

Sensor Tests The technician should test the functionality of each sensor by blocking the sensor and watching its state change on the front panel.

NOTE Several jam sensors only change state if a jam has occurred. All doors (interlock switches) must remain closed or defeated to test for a changed state.

NOTE The default state of all sensors are shown under the following conditions:.

■ The printer’s front panel displays “Ready to Print.”■ All covers are closed.■ All routine maintenance items and toner cartridges are installed.■ All trays and Tray 1 (MPT) have paper in them.■ No paper is in the paper path or Finisher.■ The Finisher is docked correctly to the printer.■ No motor tests have been performed to change the position of any components.■ The waste cartridge is not full.

Ambient Temp/Humidity

Temperature is XXo C Humidity is XX%

Fuser Temperature Front Temp is XXo C

Back Temp is XXo C

Interlocks Front (or Right) Door is L(A) Left Upper Door L (D) Duplex Cover is L (B) Left Lower Door is L(C) Optional Tray Left Cover L

H = OpenL = Closed

NOTE Only one door can be open at a time to run this test.

Test Front Panel Display Test Operation Definition

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4-6 Phaser 7750 Printer Service Manual

Jam Sensors LH Low Cover Area is LLH Cover Area is LLH Fuser Area is LDuplex Cover Area is L Tray Left Cover Area is LTray #3 Area is LTray #4 Area is L Tray #5 Area is L (F) Fin Compiler Cover Area L(G) Fin Compiler Safety Area L(H,J) Fin Front Cover Area is LFin Hor Tran Area is LFin Docking Area is L

H = Paper presentL = Paper not present

This is the FIN IN GATE.This is the FIN HOR.TRANS.This is the FIN EJECT.

POB Sensor POB Sensor is H Paper on Belt SensorL = Paper presentH = Paper not present

Registration Sensor Registration Sensor is H L = Paper presentH = Paper not present

OHP Sensor Left OHP is LRight OHP is L

L = Paper or OHP presentH = Paper or OHP not present

Duplex Sensor Duplex is L H = Paper presentL = Paper not present

Tray Feed Sensors Feed Out #1 is LTake Away (F/O #2) is L Feed Out #3 is LFeed Out #4 is LFeed Out #5 is L

H = Paper presentL = Paper not present

Stack Full Sensor Stack Full is H H =Output Stack not fullL = Output Stack full

Fuser Exit Sensor Fuser Exit is L H = Paper presentL = Paper not present

1st BTR Retract Sensor

1st BTR Retract is L H = In contactL = Retracted

2nd BTR Retract Sensor

2nd BTR Retract is H H = In contactL = Retracted

Fuser Present Fuser is PresentChange soon | Change

Need to cycle power to get the results to change when installing a new fuser.

Read Fuser Fuses Fuse 1 is Shorted Fuse 2 is Shorted Fuse 3 is Shorted(New Fuser)

100 page fuse50% Life99% LifeOpen indicates Fuse is blown.

Accum MOB Sensor MOB sensor is L H = belt home mark is sensedL = belt home mark not sensed

Belt Edge Sensor Edge is nnn (current value) OK or Failed

Test Front Panel Display Test Operation Definition

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General Troubleshooting 4-7

BTR Sensors BTR Y is LBTR M is LBTR C is LBTR K is L1st BTR is L2nd BTR is L

H = ErrorL = No error

ADC Sensor ADC is XXX ADC = Automatic Density CorrectionGo to ADC Output check under adjustments and calibration.

Toner Waste Cartridge

Waste Cartridge presence is H

Waste Cartridge full is L

All door switches must be closed.H = Present or fullL = Not present or not full

Tray Sensors Tray 2Do you want auto media lift?YesNoTray 2: SW1-4:HHHL-<Letter> Level: H NoPaper: LTray 3 - <same as tray 2>Tray 4 - <no data available if HCF is installed>Tray 5 - <same as tray 3, 4>

The four switch pattern indicates the media size. Refer to the media switch table in the Wiring Diagrams chapter of this manual.

L = Tray not liftedH = Tray liftedH = Paper not presentL = Paper present

NOTE Level 6 entries for Trays 3-5 follow the same pattern as for Tray 2.

Tray1 (MPT) Sensors MPT No Paper is L - MPT size is XXX

MPT = Multi-Purpose TrayRange (0 - 1000)i.e. Letter LEF approx. 180i.e. Letter SEF approx. 460

HCF/LTD Sensors No HCF Attached orHCF Path 1 is L HCF Path 2 is L

High-Capacity Feeder

ATC Sensor ATC 1 is nnnATC 2 is nnnATC 3 is nnnATC 4 is nnn

ATC = Automatic Toner CalibrationValue range (0 - 1000)

Imaging Unit Sensors

Imaging Unit Yellow is HImaging Unit Magenta is HImaging Unit Cyan is HImaging Unit Black is H

H = Cartridge presentL = No cartridge present

New Toner Cartridge Sensor

Test Front Panel Display Test Operation Definition

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Finisher Sensors Interlocks Left-Hand Cover is L Top Cover is L Docking is H Horiz. Transport is L Horizontal Transport Entry is L Exit is L IOT Full is LCompiler Tray Exit is L Paper is L Cover Safety Switch is L Stacker No Paper is L Height is H Upper Limit is L Stack A is L Stack B is L Tamper Rear Home is L Front Home is H Stapler Head Home is L Low is L Ready is L Move is L Front Corner is HMiscellaneous IOT Reg. Clutch is H Eject Home is L Set Clamp Home is L Decurler Cam Position L

Optional - only if Finisher is installed

H = Open, actuated or paper presentL = Closed, deactuated or no paper present

Motors/Fans Tests Tests the operation of motors by running one or more motor tests at a time.

CAUTION To avoid damaging the accumulator belt, it must be removed prior to performing the following motor tests:

■ Steering Motor■ Imaging Unit Motor ■ Accumulator Belt Motor

Main Motor Main Motor is On Turn Motor Off All Motors Off

This test produces gear hopping noise unless you perform the 2nd transfer roller retract motor test, prior to this test.

Test Front Panel Display Test Operation Definition

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General Troubleshooting 4-9

Steering Motor Do you wish to continue?YesNo

Motor OnMotor Off

Please cycle power to the printer now!

CAUTION To avoid damaging the Accumulator Belt, it is recommended that you leave the belt installed and perform the Belt Edge Learn test instead, See "Belt Edge Learn" on page 4-11.

Bypass the right-hand door interlock switch and observe the steering motor as the test is performed.

Imaging Unit Motor Do you wish to continue?YesNoMotor OnMotor Off

Please cycle power to printer now!

NOTE Only run this test once per power cycle to avoid excessive toner being forced inside the developer and damaging it.

Accum Belt Motor Do you wish to continue?YesNoMotor OnMotor Off

Please cycle power to printer now!

NOTE The accumulator belt must be removed prior to running this test.

1st BTR Retract/Contact Motor

Press Back or Cancel to abort NOTE Repeated executions of 1st BTR Motor Test will cause Motor Retract, Motor Contact, Motor Retract, etc.

2nd BTR Motor 2nd BTR Motor is Retract This test toggles between the two values of Retract and Contact.Motor Off

NOTE This test needs to be run twice to return the motor to a retracted position.

Duplex Motor Duplex motor is OnTurn Motor On (Low Speed)Turn Motor On (High Speed)All Motors Off

Press Up/Down to change setting.

Paper Feed Motors Feed Motor: 2345

NOTE Running this test causes a static jam. Clear paper path after running this test.

Paper Lift Motors Lift Motor: 2345

Press Up/Down to change setting.

Test Front Panel Display Test Operation Definition

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4-10 Phaser 7750 Printer Service Manual

Offset Motor Direction: Forward Backward

Press Up/Down to change setting.

Color Developer MotorDeveloper Motor

Developer Motor is On Turn Motor OffAll Motors Off

Dispensor Motor Disp. Motor: YellowMagentaCyanBlack

NOTE Only run this test once per power cycle to avoid excessive toner being forced inside the developer and destroying it.

Agitator Motor Motor OnMotor Off

Press OK to run test.

Fans Fuser / LVPS / RearFan is On Turn Motor Off All Motors Off

Press Up/Down to change setting.

Paper Path/No Pick NoPaperRun Init Runs a complete print cycle only. No paper is picked and no toner is dispensed.

Finisher Motors-Optional-

OptionalMiscellaneous Main Eject Forward Eject Release

Stacker Motor Up Motor Down

Tamper Rear Tamper Low Front Rear Tamper Middle Front Rear Tamper High Front Rear Tamper Low Rear Rear Tamper Middle Rear Rear Tamper High Rear Front Tamper Low Front Front Tamper Middle Front Front Tamper High Front Front Tamper Low Rear Front Tamper Middle Rear Front Tamper High Rear

Stapler Close Reverse Move Front Move Rear

Press Up/Down to change setting.

Test Front Panel Display Test Operation Definition

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General Troubleshooting 4-11

Clutch Tests Tests functionality of clutches by activating one clutch at a time.

Take-Away Clutch Clutch OnClutch Off

All tests are activated by pressing OK. Listen for the clutch.Test times out after 1 second.

Developer Clutch Clutch OnClutch Off

Registration Clutch Clutch OnClutch Off

Duplex Clutch Which Direction?CCWCWClutch OnClutch Off

Finisher Clutches Decurler Cam ClutchClutch OnClutch Off

Solenoid Tests Tests functionality of the solenoids by activation one solenoid at a time.

Exit Gate Solenoid Solenoid OnSolenoid Off

Duplex Gate Solenoid

Solenoid OnSolenoid Off

Shutter Solenoid Solenoid OnSolenoid Off

Press OK to run test.

ADC Shutter Open Solenoid On ADC = Automatic Density CorrectionPress OK to run test.

ADC Shutter Close Solenoid Off ADC = Automatic Density CorrectionPress OK to run test.

Tray 1/ MPT Feed Solenoid

Solenoid OnSolenoid Off

MPT = Multi-Purpose TrayPress OK to run test.

Finisher Solenoids Set Clamp PaddleHTrans Gate In OpenHTrans Gate In Close

Press OK to run test.

Adjustments/ Calibrations Performs adjustments, calibrations and operations essential to the performance of the printer. For details on performing the RegiCon procedures, see "RegiCon Adjustment Procedures" on page 6-5.

Belt Edge Learn OK or Failed

ATC Sensor Setup See to "ATC Sensor Setup" on page 6-14.

TRC Adjust Displaces toner rendering curve points, not technician adjustable.

Test Front Panel Display Test Operation Definition

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ADC Output Check Measuring:Result = 0Stop Status = 0ADC Sensor Fail = 0 ADC shutter Fail - 0

This tests the Automatic Density Correction sensor.

Tone Up/Down Measuring:Result = 0 Status = 0ATC Sensor Fail = NoneATC Limit Warn = NoneATC Change Warn = None

This tests the Automatic Toner Calibration sensor.

Laser Power Check Y=OK M=OK C=OK K=OKYMCK=OKYMCK(CycUp)=OK

This tests the laser output.

PWM Mapping Data Read

Coarse RegiCon Init See "Coarse RegiCon Initialization" on page 6-12.

Maintenance Engine maintenance functions

Clean Fuser Fuser Cleaning Sheets Runs five sheets of paper through the fuser from the default tray.

Clean Accumulator Belt

Do you wish to continue?YesNoMotor OnMotor OffPlease cycle power to the printer now!

CAUTION To avoid damaging the Accumulator Belt, it is recommended that you leave the belt cleaner installed and perform the Belt Edge Learn test instead, see "RegiCon #1 Fine Skew Adjustment" on page 6-7.

NVRAM Access You can read or reset, selected NVRAM address locations. For all NVRAM access tests, see "Service Diagnostics NVRAM Resets" on page 6-19.

PostScript NVRAM Reset

See "Service Diagnostics NVRAM Resets" on page 6-19.

Clear Tech Rep Faults

Clear <4-36>Clear <9-380 ~ 9-383>Clear <9-654>Clear <9-910 ~ 913>Clear <10-348 & 10-350>

Error Code 30Error Codes 12, 13, 14, & 15ADC Sensor ErrorImaging Unit type mismatchError Codes 40 and 44

Reset CRU Life Counters

Resets the life on individual routine maintenance items.

Reset Engine NVRAM

**Writes data to Eng NVM**Are you sure?YesNo

This writes data from the hard drive to the engine NVRAM.See "Resetting Engine NVRAM" on page 6-17.

Test Front Panel Display Test Operation Definition

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General Troubleshooting 4-13

Store Engine NVRAM **Writes data to HD**Are you sure?YesNo

This takes data from engine NVRAM and stores it onto the drive.See "Store Engine NVRAM" on page 6-21.

Exit Exits to PostScript without running POST.

Test Front Panel Display Test Operation Definition

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Front Panel Troubleshooting

The Printer Does Not Come to a “Ready” State

Printer Does Nothing When Power is Switched On

See "Troubleshooting AC Power" on page 4-16.

LVPS, Fuser, and ROS Fans On, Front Panel LED Does Not Come On

1. Observe the blinking pattern on health LED (see chart on page 3-9) and troubleshoot the indicated problem.

2. The problem power supply is most likely the center 5 VDC supply. See "Troubleshooting the Low-Voltage Power Supplies" on page 4-17.

3. Replace the front panel (see page 8-5).

4. Replace the front panel cable (see page 8-5).

5. Remove the internal hard drive and reboot the printer (see page 8-39). If the splash screen now appears, replace the hard drive.

6. Replace the image processor board (see page 8-38).

LVPS, Fuser, and ROS Fans On, Front Panel LED is Red, No Front Panel Message

1. Observe the blinking pattern on health LED (see chart on page 3-9) and troubleshoot the indicated problem.

2. Replace the front panel (see page 8-5).

3. Replace the front panel cable (see page 8-5).

4. Replace the internal hard drive (see page 8-39).

5. Replace the image processor board (see page 8-38).

Front Panel Continually Displays “Xerox Phaser 7750” Splash Screen

1. Enter service diagnostics mode and watch the front panel during the "initializing" period for messages indicating any printer faults.

2. View the fault list for indications of any printer faults.

3. Replace the image processor board.

4. Replace the hard drive.

5. Replace the card cage assembly.

6. Replace the engine control board.

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General Troubleshooting 4-15

Front Panel Displays "Fatal Fault Encountered" MessageSee the procedure for "Controller to Engine Communications Failure, Code 81" on page 3-39.

Inoperable Printer Troubleshooting

False LH Door, RH Door, Front Door Open, or Imaging Units Missing Messages

See the "Troubleshooting Power Supplies and Interlocks" on page 4-16.

For all of the Following Problems go to the Error Code Procedure "Tray Lift Failure, Code 87" on page 3-41.

■ False "Load Paper in Tray [2,3,4,5]" Message

■ False "Tray [2,3,4,5] Missing" Message

■ Tray 2, 3, 4 or 5 will not lift or the printer will not recognize the auxiliary feeder.

Printer Does Not Recognize the Finisher

The finisher is connected to the printer by a complementary pair serial data link. The finisher also generates its own +5 VDC from +24 VDC supplied by the printer.

Troubleshooting Procedure

Step Actions and Questions Yes No

1 Check that the finisher is properly docked with and connected to the printer.

Go to Step 2. Repair the docking problem.

2 From the front panel check the Service Diagnostics Test Table to see if the finisher is recognized by the printer.

Reload the driver. Go to Step 3.

3 1. Remove the rear cover and board cover from the finisher.

2. Check for presence of +24 VDC between the finisher board P844-2 and finisher frame ground.

Go to Step 4. Troubleshoot and repair missing 24 VDC.

4 Turn off power and check the continuity of the serial data link circuit by verifying continuity between P531B-9 through –16 on the engine control board, and P843-1 through –8 on the Finisher Board.

Replace the finisher board.

Replace the engine control board.

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Troubleshooting Power Supplies and Interlocks

Troubleshooting AC Power

NoteThe GFI, Noise Filter, and AC Drive Board are all part of the AC Electrical Chassis.

Actions

1. Check the AC input voltage at the outlet.

2. Reconnect AC power. If the GFI trips immediately with the power switch OFF, disconnect AC power, remove the rear cover and metal shields.

3. Check for shorts in the AC Circuit from the GFI to the noise filter, the AC driver board and up to the power switch.

4. Switch the printer on. If the GFI trips, unplug the printer, remove the fuser, then retest.

5. Remove the rear cover and the two metal shields. Connect AC Input and switch the printer on. Check for AC voltage at:

a. J72 on top of the GFI, if not present replace the GFI.

b. Between FS76 and FS77 of the Noise Filter, if not present replace the noise filter.

c. Into and out of the power switch, if not present replace the power switch.

d. The connector at the bottom of the 3.3 VDC, 5 VDC, and 24 VDC LVPS, if not present replace the AC drive board.

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General Troubleshooting 4-17

Troubleshooting the Low-Voltage Power Supplies

3.3 VDC, 5 VDC and 24 VDC voltages are supplied by individual low-voltage power supply boards. The 24 VDC LVPS requires the presence of a 5 VDC enabling signal to operate.

NoteBefore troubleshooting power supply problems, disconnect the lower tray deck or finisher, if installed, and restart the printer. Verify the problem is still present or refer to the appropriate option troubleshooting section.

1. Verify the printer is plugged in and the GFI is not tripped, if it is see "Troubleshooting AC Power" on page 4-16.

2. Remove the image processor board cover and metal plate. Disconnect the relay board power connector J300.

3. Switch the printer on. Check for 3.3 VDC at J510-1, -2, and -5. Check for 5VDC at J511-2, -3, and -4, and J511-3, -6, and -7. If 5 VDC is present check for 24 VDCDC at J505-1.

4. If no DC voltages are present, see Troubleshooting AC Power on page 3-87.

5. If 5 VDC is present but 3.3 VDC is not, see "Troubleshooting the +3.3 VDC and (2) +5 VDC Low-Voltage Power Supplies" on page 4-18.

6. If 3.3 VDC is present but 5 VDC and 24 VDC are not, see "Troubleshooting the +3.3 VDC and (2) +5 VDC Low-Voltage Power Supplies" on page 4-18.

7. If 5 VDC is present but 24 VDC is not, see "Troubleshooting the 24 VDC LVPS" on page 4-18.

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Troubleshooting the +3.3 VDC and (2) +5 VDC Low-Voltage Power Supplies

NoteSwitch off power and disconnect the power cord.

Troubleshooting the 24 VDC LVPS

NoteSwitch off power and disconnect the power cord. The 24 VDC LVPS requires a 5 VDC enable signal to operate. Ensure proper operation of the 5 VDC LVPS before proceeding.

Actions

1. Remove the rear cover and rear shield.

2. Disconnect the harnesses to connectors P505, P510, P511 and 2nd BTR on the T1 HVPS, remove 3 screws and lower the T1 HVPS.

3. Connect AC Power and switch the printer ON.

4. Check for proper AC voltage at the connector at the bottom of each LVPS.

5. If not present, go to the Troubleshooting AC Power section (link).

6. Check for 3.3 VDC or 5 VDC at the connector at the top of the LVPS.

7. If correct voltage is not present, unplug the top connector and retest. If no voltage is present replace the LVPS. If the voltage returns check the harness, image processor board, engine board, and relay board for shorts.

1. Remove the rear cover and 24 VDC PS metal shield.

2. Connect AC power and switch the printer ON.

3. Check for proper AC voltage at the connector at the bottom of the LVPS. If not present, go to "Troubleshooting AC Power" on page 4-16.

4. Check for the 5 VDC enable signal at P505-3 (grey wire).

5. If not check the same signal at the engine interface board P537-6. If not present, replace the engine control board, then the engine interface board.

6. Check for 24 VDC at any of the orange wires of connector P502 at the top of the LVPS.

7. Unplug the connector and retest.

8. If still no voltage, replace the LVPS. If the voltage returns check all 24 VDC circuits for shorts to frame ground in the wiring harness, engine board, relay board and interlock circuit.

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General Troubleshooting 4-19

Interlock Circuit Diagram

The +24 VDC Interlock Circuit

The 24 VDC interlock circuit runs from the 24 VDC LVPS to the L/H door interlock switch, the R/H door interlock switch, and the front door interlock switch back to the engine control interface board, then into the engine control board. Opening this circuit prevents the laser unit and the high-voltage power supplies from operating.

1. Check to see if the front door is getting +5 VDC.

2. With all doors closed and printer power on, check for +24 VDC between P531-1 of the engine control board and frame ground.

3. If +24 VDC is not present, see See “Troubleshooting the 24 VDC LVPS” on page 13. to verify the 24 VDC LVPS is working.

4. If +24 VDC is present, then check the LH cover interlock switch, the RH cover interlock switch and the front cover interlock switch.

PRINT CARTRIDGE CRUM CONNECTORS

WASTE CARTRIDGEINTLK SW

FRONT COVER INTLK SW R/H COVER INTLK SW LH COVER INTLK SW

LVPS

LVPS

INTERFACEBOARD

C

K

M

Y GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

ORN ORN ORN ORN

GRYGRY

GRY

VIO

VIO

GRY

LDPOWERRELAY

24V

5VP536

P537

J631

1

1

23

3

45

5

6

67

S7700-432

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The +5 VDC Interlock Circuit

The 5 VDC interlock circuit runs from the 5 VDC LVPS to the L/H door switch, then to the engine control interface board, out to the R/H door switch, back to the engine control interface board, out to the front door, through the coil of the LD power relay and back to the 5 VDC LVPS. This circuit helps identify which door has interrupted the 24 VDC circuit.

If the circuit is complete, LD power relay activates, and 5 VDC is sent to the waste cartridge installed interlock switch and through all four imaging unit connectors and to the engine control interface board. This signal merely confirms that all imaging units are installed. Individual missing components are identified at power-up or when a door is closed (completing the 24 VDC circuit) and the engine control board interrogates the imaging unit NVRAM. If the imaging units are present, then the waste cartridge is missing by default.

1. With all doors closed and printer power on, check for +5 VDC between P536-4 of the engine control interface board and frame ground. If not present, check the LD relay and the LH cover interlock switch.

2. Check for +5 VDC between P631-3 of the engine control interface board and frame ground. If not present, check the front cover interlock switch.

3. Check for +5 VDC between J568-5 (top pin) of the LD power relay and frame ground. If not present, check the RH cover interlock switch.

4. Check for +5 VDC between J400-6 of the engine control interface board and frame ground. If not present, check the LD power relay, and the circuit through the waste cartridge sensor and the four imaging unit connectors.

5. If +5 VDC is present, then replace the engine control board.

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General Troubleshooting 4-21

Media Jams and the Paper Path

Media-Based Problems

■ Print the Paper Tips page from the printer’s front panel for a list of the supported media types and weights. The customer should be using a quality laser printer paper. The printer may have trouble picking smooth-finish paper. Verify the tray and the printer support the media being used by the customer. Not all supported types can be used from all trays.

■ Only Phaser 45-Series Transparency Film should be used in this printer.

■ Inspect the paper for bent, torn, or folded corners.

■ Ensure that the media type matches the settings at the front panel.

■ Ensure that the paper guides are set correctly.

Multiple-Sheet Pick

1. Ensure that the paper is in good condition and appropriate for a laser printer; quality office laser printer paper works best.

2. Ensure that the printer is within its environmental specifications by using the built-in service diagnostics temperature test.

3. Ensure that the paper is correctly loaded in the tray and the tray has not been over filled.

4. Try loading paper from a fresh ream or flip the paper over.

5. Clean the pick rollers with a clean, slightly moistened, lint-free wipe.

6. Replace the paper pick rollers.

7. Check the tray’s retard roller for damage.

Mis-Pick

1. Check that the correct type of media is being used.

2. Try loading paper from a fresh ream or flip the paper over.

3. Clean the pick rollers with a clean, dry, lint-free wipe.

4. Troubleshoot the pick roller assembly.

Damaged Prints

The printed page exits either wrinkled, creased, or torn. The printer neither jams nor displays an error code.

1. Stop the paper in the paper path to determine where the media becomes damaged.

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2. Feed paper through the printer from each of the available trays, including Tray 1/MPT. Is the paper damaged when fed out of one tray but not when fed out of the others? If so, inspect the tray for damage, ensure that the media guides are set correctly and verify that the proper media is being used.

3. Inspect the paper feeders for debris or broken components.

4. The following components are associated with this specific problem. One or more of these components may have failed partially or completely. If you cannot isolate the problem, replace each component listed below, one at a time, until the problem disappears.

■ Fuser

■ Accumulator Belt (usually appears with toner in creases or wrinkles).

Fuser Jams

1. Is the paper in good condition and appropriate for a laser printer?

2. Is Phaser 45-Series Transparency Film being used?

3. Is the printer operating within its environmental specifications?

4. Ensure that the loaded media type matches the settings on the front panel.

5. Check the fuser exit sensor and the POB sensor in service diagnostics.

6. Are the margins on the page greater than 3 mm?

7. Check the fuser area for debris.

8. Visually inspect the fuser baffle for burrs.

9. Test the paper path switches and sensors in service diagnostics.

10. Replace the fuser.

11. Replace the engine control board.

Exit Jams

1. Is the paper in good condition and appropriate for a laser printer? Is the paper curling?

2. Is the printer printing within its environmental specifications?

3. Ensure that the loaded media type matches the front panel settings.

4. Is the jam caused by a heavy, stiff paper being used for two-sided printing? In such cases, a lighter grade of paper should be used.

5. Clean all the eject rollers with a clean, dry, lint-free wipe if debris is visible.

6. Does the exit sensor flag properly actuate its sensor? Test the sensor using Service Diagnostics.

7. Test the POB sensor in Service Diagnostics.

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General Troubleshooting 4-23

Operating System and Application Problems

Windows 2000, Windows XP, Windows Server 2003 Troubleshooting (TCP/IP)

NoteFor Windows XP, select Classic Look or the Windows XP procedures will not match the steps below. To select Classic Look, click Start, then Settings, then Taskbar and Start Menu. Select the Start Menu tab, then select Classic Start menu. Click OK.

This troubleshooting section assumes you have completed the following tasks:

■ Loaded a Phaser printer PCL or PostScript printer driver.

■ Printed and kept a current copy of the “Configuration Page”.

Printing the Configuration Page

You can print the “Configuration Page” to help you solve printing problems and obtain the best results from your printer. Access this page from the printer’s front panel.

To print the “Configuration Page”:

1. At the printer’s front panel, select Printer Setup, then press the OK button.

2. Select Configuration Page, then press the OK button to print.

NotePrint “Menu Map” to see other information pages available for printing.

Verifying Settings

1. Verify the settings on the “Configuration Page”.

■ IP Address Source is set to: DHCP, Front Panel, BOOTP, or Auto IP (depending on your network configuration).

■ Current IP Address is set correctly. (Note this address if it is assigned by Auto IP, DHCP, or BOOTP.)

■ Subnet Mask is set correctly (if used).

■ Default Gateway is set correctly (if used).

■ LPR is enabled. Verify that the LPR and AppSocket settings are set as desired.

■ Interpreters: Auto, PCL, or PostScript (depending on your driver).

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2. Verify that the client is logged into the network and printing to the correct print queue. The user should also have access to the Phaser printer queue.

Verifying Driver Installation1. Right-click My Network Places on the desktop, then click Properties.

2. Right-click Local Area Connection, then click Properties.

3. Click the General tab. View the list of installed network protocols to verify that TCP/IP is installed. (For more information, contact your network administrator.)

4. Click Install to install any components not listed, then restart your computer.

5. Click Start, click Settings, then click Printers.

6. Right-click the printer icon, then click Properties.

7. Click the Advanced tab. Verify that the correct printer driver is installed.

8. Click the Ports tab. Verify that the IP Address in the Print to the Following Ports list is identical to the one on the “Configuration Page.” You may need to click the Configure Port button to see the IP address. If necessary, re-select the TCP/IP number used for the printer.

Printing a Test Page

1. Click the General tab.

2. Click Print Test Page. If the printer does not print, do one of the following:

■ Select PhaserSMART Technical Support on the Troubleshooting tab of your Windows printer driver to access PhaserSMART Technical Support.

■ Go to www.xerox.com/office/support.

Windows NT 4.x Troubleshooting (TCP/IP)

This troubleshooting section assumes you have completed the following tasks:

■ Loaded a Phaser printer PCL or PostScript printer driver.

■ Printed and kept a current copy of the “Configuration Page”. For information about printing a “Configuration Page”, go to Reference/Features/Front Panel on the User Documentation CD-ROM.

Verifying Settings

1. Verify the settings on the “Configuration Page”.

■ IP Address Source is set to: DHCP, Front Panel, BOOTP, or Auto IP (depending on your network configuration).

■ Current IP Address is set correctly. (Note this address if it is assigned by Auto IP, DHCP, or BOOTP.)

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■ Subnet Mask is set correctly (if used).

■ Default Gateway is set correctly (if used).

■ LPR is enabled. Verify that the LPR and AppSocket settings are set as desired.

■ Interpreters: Auto, PCL, or PostScript (depending on your driver).

2. Verify that the client is logged into the network and printing to the correct print queue. The user should also have access to the Phaser printer queue.

Verifying Installation

1. Right-click the My Network Places icon on the desktop and select Properties.

2. Click the Protocols tab to verify that the TCP/IP protocol has been installed.

3. Click Add to install any components not listed, then restart your computer.

4. Click Start, click Settings, then click Control Panel.

5. Double-click Services.

6. Locate TCP/IP Print Server, then verify these column entries:

■ Status column: Started

■ Startup column: Automatic

7. Click Start, click Settings, then click Printers.

8. Right-click the printer icon, then select Properties. Verify that you have installed the correct driver for your printer.

9. Select the Ports tab. Verify that the IP Address in the Print to the Following Port list is identical to the one on the “Configuration Page.” You may need to click the Configure Port button to view the IP address. If necessary, re-select the TCP/IP number used for your printer.

Printing a Test Page

1. Click the General tab.

2. Click Print Test Page. If the printer does not print, do one of the following:

■ Select PhaserSMART Technical Support on the Troubleshooting tab of your Windows printer driver to access PhaserSMART Technical Support.

■ Go to www.xerox.com/office/support.

Windows 98 and Windows Me Troubleshooting

This troubleshooting section assumes you have completed the following tasks:

■ Verified that the printer is plugged in, turned on, and connected to an active network.

■ Installed a Phaser printer PCL or PostScript print driver.

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■ Verified that the printer is receiving network traffic by monitoring the LED’s on the back of the printer or on the CentreDirect External Print Server. When the printer is connected to a functioning network and receiving traffic, its link LED is green, and its amber traffic LED is flashing rapidly.

■ Printed and kept a current copy of the “Configuration Page”. For information about using the front panel or printing a “Configuration Page”, go to Reference/Features/Front Panel on the User Documentation CD-ROM.

Verifying Settings

1. Right-click Network Neighborhood on the desktop, then click Properties.

2. Click the Configuration tab. A list of installed network components appears for the following items:

■ Client for Microsoft networks

■ Xerox TCP/IP Port Monitor

3. If you are running CentreWare DP verify the following:

■ Novell Networks: You are required to load Novell IntraNetWare Client or Microsoft Client for IPX networks.

■ TCP/IP Networks: No additional software is required, but your printer must have a valid TCP/IP address assigned.

4. If any of the above protocols or services are not installed, install the necessary components and restart the system. When the system is restarted, return to this document.

5. Click Start, click Settings, then click Printers. The Printers window appears.

6. Right-click the printer icon, then click Properties.

7. Select the Details tab.

8. Verify the following:

a. The printer driver name in the Print Using the Following Driver list. If necessary, re-select or install a new printer driver.

b. The Port name in the Print to the Following Port list. If necessary, re-select the correct name.

9. Send a print job to the printer. If the printer does not print, access PhaserSMART Technical Support from the Troubleshooting tab of the Windows printer driver or go to www.xerox.com/office/support.

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General Troubleshooting 4-27

Macintosh Troubleshooting (Mac OS 9.x, Mac OS X, Versions 10.1 and 10.2)

The following procedure eliminates cabling, communication, and connection problems. Once you complete these steps, print a test page from your software application. If the job prints, no further system troubleshooting is necessary. If there are print quality problems, go to Reference/Troubleshooting on the User Documentation CD-ROM.

Macintosh Troubleshooting Step-By-Step

Mac OS 9.x

Perform these steps only for Mac OS 9:

1. Open the Chooser, then click the LaserWriter driver.

2. Do one of the following:

■ If the printer name appears, your printer is communicating through the network. You do not need to perform any additional steps.

■ If your printer name does not appear, proceed to Step 3.

3. Verify that the printer is plugged in, turned on, and connected to an active network.

4. Verify the cable connection from the network to the printer.

5. Follow these steps:

a. From the printer’s front panel, verify that EtherTalk is enabled. If it is not, enable it in the front panel, then reset the printer.

b. Print the “Configuration Page” and verify that EtherTalk is enabled.

c. From the “Configuration Page”, verify the Zone. If you have multiple zones on your network, verify that your printer appears in the desired zone.

6. If you are still unable to print, go to www.xerox.com/office/support or access PhaserSMART Technical Support through CentreWare Internet Services:

■ Launch your web browser.

■ Enter your printer's IP address in the browser’s Address field (http://xxx.xxx.xxx.xxx).

■ Select Support.

■ Click the PhaserSMART Diagnostic Tool link to access PhaserSMART.

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Mac OS X, Versions 10.1 and 10.2

Perform these steps only for Mac OS X, versions 10.1 and 10.2:

1. Open the Network Utility, then click the Ping tab.

2. Enter your printer’s IP address.

3. Click Ping. If you do not get a response, confirm that your TCP/IP settings are correct for both your printer and computer.

4. For AppleTalk, follow the steps below. For TCP/IP proceed to Step 5.

a. From the printer’s front panel, verify that EtherTalk is enabled. If it is not, enable it in the front panel, then reset the printer.

b. Print the “Configuration Page” and verify that EtherTalk is enabled.

c. From the “Configuration Page”, verify the Zone. If you have multiple zones on your network, verify that your printer appears in the desired zone.

5. If you are still unable to print, go to www.xerox.com/office/support or access PhaserSMART Technical Support through CentreWare Internet Services:

a. Launch your web browser.

b. Enter your printer's IP address in the browser’s Address field (http://xxx.xxx.xxx.xxx).

c. Select Support. d. Click the PhaserSMART Diagnostic Tool link to access PhaserSMART.

Novell NetWare Troubleshooting

Troubleshooting for Windows-based computers includes both hardware and software solutions to eliminate cabling, communication, and connection problems associated with direct-connected ports. Complete one of the following procedures (based on the type of port being used), then print a test page from your software application. If the test page prints, no further system troubleshooting is necessary. For print-quality problems, go to Reference/Troubleshooting on the User Documentation CD-ROM.

Requirements

Verify that you:

■ Are operating a Windows-based system with CentreWare DP software installed and at least one printer driver installed

■ Are a NetWare Network Administrator, an administrative person with ADMIN/SUPERVISOR, or ADMIN/SUPERVISOR EQUIVALENT within login rights to the NetWare Server(s) servicing the Phaser printer

■ Have a basic knowledge of NetWare

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Novell NetWare Troubleshooting Quick Check

1. Verify that the printer is plugged in, turned on, and connected to an active network.

2. Verify that the printer is receiving network traffic by monitoring the LEDs on the back of the printer. When the printer is connected to a functioning network and receiving traffic, its link LED is green, and its amber traffic LED is flashing rapidly.

3. Verify that the client is logged into the network and printing to the correct print queue.

4. Verify that the user has access to the Phaser printer queue.

5. Verify that the Phaser printer NetWare print queue exists, is accepting jobs, and has a print server attached. If it does not, use the Setup Wizard in CentreWare DP to reconfigure the print queue.

6. Print the “Configuration Page”. Verify that Printer Server is enabled. Set the frame type to the frame type your NetWare server is using.

NoteTo determine your NetWare IPX frame type, type config at the Novell console screen. On networks using multiple IPX frame types, it is critical that the frame type be set correctly.

7. Verify that the Primary Server is set (NetWare 3.1x only). The primary server should have been set during initial queue setup and installed using CentreWare DP. If it is not set, use CentreWare DP to set it, then reset the printer.

NoteSetting the Primary Server is extremely important on large networks.

8. Go to www.xerox.com/office/support if the above steps fail to resolve the printing problem.

Novell NetWare Troubleshooting Step-By-Step

These procedures eliminate cabling, communication, and connection problems associated with network connected printers. The steps are divided into two groups:

■ Novell NetWare Hardware Step-by-Step

■ Novell NetWare Software Step-by-Step

NoteNovell NetWare Software Step-by-Step assumes that you are connected to a Novell NetWare network with a Windows OS installed on the client workstation. When both of these procedures are completed, print a test page from your software application. If the test page prints, no further system troubleshooting is necessary.

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Novell NetWare Hardware Step-By-Step

Note the LED activity on the printer. The green link LED is ON whenever it is connected to an active network. The amber traffic LED is flickering when data is being received.

1. Verify the following:

■ The cable connections: Use a new cable or connectors if possible

■ Which port your printer is attached to. Connect a functioning network device to your printer to test the port.

2. Print the “Configuration Page” from your printer. For information about printing Configuration pages, go to Reference/Features/Front Panel.

3. Review the Connectivity Settings and verify these items:

■ NetWare is enabled

■ Frame Type matches the frame type of the desired file server

NoteTo determine your NetWare IPX frame type, type config at the Novell console screen. On large networks, using multiple IPX frame types, it is critical that the frame type be set correctly.

■ PDL is set to your desired PDL (PostScript or PCL) or to Auto

■ Primary Server (for NetWare 3.x only) is set to the name of the server which serves the print queue you have assigned to the Phaser printer

■ NDS Tree (for NetWare 4.x NDS and later) is set for the correct NDS tree name

■ NDS Context (for NetWare 4.x NDS and later) is set for the correct NDS Context

■ Print Server (PServer) Name is set for the name selected for the Phaser printer to act as a print server

■ Novell Mode is correctly set

4. If changes are made, reset the printer. Once the printer has been reset, allow approximately two minutes for the printer to go through a self test, then log onto the network server.

5. Print out another copy of the “Configuration Page” to verify that the items you modified were set and kept.

Novell NetWare Software Step-By-Step

1. Verify that CentreWare DP and a Phaser printer driver have been loaded on the workstation.

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2. Click Start, click Settings, then click Printers to verify that the printer is installed.

Launching CentreWare DP

1. Click Start, click Programs, then click CentreWare DP.

2. Select the desired printer. If a communications error message appears, your printer is not able to communicate with your workstation. Verify your printer’s settings, then return to this document.

3. With the printer selected, click the Printer drop-down list, then select Advanced Setup.

4. Select one of the following connection methods:

■ Novell Directory Services

■ Bindery

5. Verify that the information displayed is also contained on the “Configuration Page”. Verify these items:

a. The queue name of the Phaser printer is set to service. If necessary, create a new queue to test the printer.

b. The Primary Server lists the server name on the “Configuration Page”

Printing a Document

1. Click the Tools drop-down list.

2. Select the Send File... menu item, then select the appropriate directory and file for downloading. Verify that this is a valid file with no errors.

3. Click OK. The file is sent to the printer. If the document does not print, review the Novell Menu settings on the “Configuration Page”.

Verifying the Network Settings

1. At the CentreWare DP main screen, click the Printer drop-down list, click Properties, then click Connections.

2. Click the Network Card tab. A new dialog box displays information about frame type and connectors.

3. Verify that the printer is enabled and the connector and frame type are correct. If changes are made, reset the printer from the front panel.

4. Re-print a test page. If the test print does not print, go to www.xerox.com/office/support.

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5Chapter

Print-Quality Troubleshooting

In this chapter...■ Print-Quality Problems Overview

■ Front Panel Test Prints

■ Service Test Prints

■ Print Engine Only Test Print

■ Print-Quality Troubleshooting

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Print-Quality Problems Overview

Print-quality defects can be attributed to printer components, consumables, media, internal software, external software applications and environmental conditions. To successfully troubleshoot print-quality problems, as many variables as possible must be eliminated. The first step is to generate prints using printable pages embedded in the printer on laser paper from the approved media list. The paper should be from an unopened ream that has been acclimated to room temperature and you should ensure that genuine Xerox toner is installed in the printer.

Print the “Paper Tips Page” for media that has been tested and approved for use in the Phaser 7750 Printer. If the print-quality defect is still present when printing on approved media from an unopened ream of paper, then software applications, and environmental conditions need to be researched.

Print a “Usage Profile” to determine the temperature and humidity the printer has been operating under. Compare this to the environmental specifications for the printer found in "Environmental Specifications" on page 1-13 of this manual. Temperature and humidity extremes can adversely effect the Xerographic and fusing characteristics of the printer.

When analyzing a print-quality defect, first determine if the defect occurs in all colors or only one color and if it is repeating or random. Continuous defects in the process direction, such as voids and lines, are the most difficult to diagnose. The visible surfaces of all rollers should be inspected for obvious defects.

Defects Associated with Specific Printer Components

Some print-quality problems can be associated with specific assemblies, the most common problems and the associated assemblies are listed below. Also, refer to the specific print-quality troubleshooting procedure for more information.

The ROS

Potential Defects:

■ Streaks from contamination on ROS windows (usually single color)

■ Light Image (single color, or all colors)

■ Banding (Slow Scan direction)

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The Imaging Units

Potential Defects (usually single color):

■ Spots

■ Deletions

■ Bands

■ Repeating defects - 44 mm (1.7 in.) or 94 mm (3.7 in.)

The Developer Housings

Potential Defects (usually single color):

■ Bead Carryout (grit on copy)

■ Spots

■ Deletions

■ Mottle

■ Uneven density front to rear

■ Repeating defects - 28.3 mm (1.1 in.)

The Accumulator Belt Assembly

Potential Defects (usually all colors):

■ Spots

■ Deletions

■ Banding

■ Uneven density front to rear

■ Offsetting/Ghost Images (cleaner malfunction)

■ Repeating defects - every 4th 8 1/2 x 11 or every other 11 x 17

The Fuser

Potential Defects (all colors):

■ Streaks

■ Spots

■ Bands

■ Offsetting

■ Repeating defects - 84 mm (3.3 in.) or 94 mm (3.7 in.)

■ Transfer Roller - 88mm

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Paper and Paper Trays

Potential Defects (all colors):

■ Mottled Image (low quality or damp paper)

■ Creases and folds

Front Panel Test Prints

A variety of test prints are available from the front panel’s Troubleshooting Menu to aid in determining the quality of output from the printer and to assist in troubleshooting problems. This section shows how to select and analyze all test prints available to the Phaser 7750 printer.

Troubleshooting Print-Quality Page

Selecting the “Troubleshooting Print-Quality Page” causes a tutorial to be printed that provides tips on diagnosing print-quality problems. The tutorial contains examples of various faults that may be encountered and also contains examples of the various color test pages, solid fill pages, and test pattern page.

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Print-Quality Troubleshooting 5-5

Color Test Pages

Selecting “Color Test Pages” causes a group of seven pages to print as shown in the following two figures. This group includes a full page each of 25% CMYK, a page of 80% solid fill red, a page consisting of 25% tint vertical CMYK bands with each band labeled, and finally the test pattern shown in the second figure below.

7750-184

Unknow

n -2pg-2˚C

-2%R

H

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

FF FF

HD

ST

HD

ST

HD

ST

HD

ST

HD

ST

HD

ST

HD

ST

HD

ST

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Analyzing the Test Pattern

1. Color Registration (Horizontal): The colored lines should match up as shown below. If necessary see the registration procedures in Chapter 6.

2. Color Registration (Vertical): The colored lines should match up as shown below. If necessary see the registration procedures in Chapter 6.

3. Uniform RGB: The secondary color squares should be uniformly colored with no mottling.

4. Density: The color squares should have even density from top to bottom.

GoodGood Bad

6250-501

6250-502

Good

Good

Bad

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Print-Quality Troubleshooting 5-7

Solid Fill Pages

Selecting “Solid Fill Pages” causes a group of six pages, as shown below, to print that consist of 80% solid fill on individual pages of CMYK for primary colors and BG for secondary.

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Repeating Defects Page

The “Repeating Defects Page” provides a measurement tool that allows you to match the spacing between repeated defects on the printed pages with the component that would cause such spacing to occur. Instructions for using the Repeating Defects Page are printed on the page.

Remove Print Smears

Selecting “Remove Print Smears” causes the printer to cycle blank paper through the printing path. continue selecting this function until the paper comes out clean.

Page 1 of 1

Match a set of repeating defectsin your print to the correspondingmarks on the appropriate verticalline. This line indicates the item,such as the transfer roller,causing the defect.

For example, the distancebetween these two marksrepresents a defect repeatingevery 44 mm; this is causedby an imaging unit. Whencorrecting a repeating defectby replacing a routinemaintenance item, followthe instructions included withthe routine maintenance item.

Note: The repeating defectmust be measured accuratelyto ensure the correct item isreplaced.

Fuser

84 mm (3.3 in.)

Fuser orImaging Unit

94 mm (3.7 in.) 28.3 mm (1.1 in.)44 mm (1.7 in.)

Transfer Roller

88 mm (3.5 in.)

Developer Roller(service only)

Imaging Unit

To diagnose a defect on theaccumulator belt:

1. Print eight A-size pageslong-edge feed. Verify thatthe same defect appears onevery fourth page.

2. Print four B-size pages.Verify that the same defectappears on every other page.

Note: Print the Supplies UsagePage for part numbers.

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Print-Quality Troubleshooting 5-9

Engine Test Prints

These features are available from the Service Diagnostics/Built-In Test Prints menu. If the “Engine Test Prints” are rendered correctly and other test prints are defective, the problem is not on the engine board.

Paper Path Options

Selecting Paper Path Options allows the printer to be configured as desired for printing any of the following Test Prints. The selectable options are:

■ Source tray

■ Number of sheets to print

■ Simplex or duplex operation

■ Offset

■ Media type

■ Output destination

■ Stapling

Print Laser Check

Since all of the laser diodes are energized, all colors will be printed resulting in a composite grey image. If the image is not grey, one or more of the diodes may be bad. If there are gaps in the printout or the color is not uniform, the unit may require cleaning, adjustment, or repair.

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Print Halftones

Selecting “Print Halftones” causes a group of six pages to print that consist of 80% solid fill on individual pages of CMYK for primary colors and RG for secondary. Colors should be uniform from top to bottom of the page with no mottling and the density for each color should be approximately equal.

Print Grid 1-Dot

Prints a square grid over the complete sheet of paper. Squares should be uniform and vertical and horizontal lines should be straight and of uniform thickness. All colors should align.

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Print Fast Scan 8 Tone

Prints one sheet each of YMCK six distinct graduated bands of the color forming a block in the center of the page and a seventh band, with density that falls between the two lightest in the block, located at the bottom of the page.

The variation between bands should be distinct and the color in each band should be uniform.

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Initial Actions Before troubleshooting any Print-Quality Problems:

■ Print a “Paper Tips Page” to verify the media being used is supported by the printer and the tray being used.

■ Verify the media settings are correct in both the printer driver software and at the printer’s front panel.

■ Check the color correction and print mode settings in the printer driver.

■ Cycle power to the printer, this will run an Auto Density Control cycle.

■ Run test prints and compare the results to the customers problem.

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Print-Quality Troubleshooting 5-13

Light or Undertone Prints in All Colors

The overall image density is too light in all colors.

1. Verify the transfer roller has not reached its end-of-life.

2. Run the Calibrate for Paper routine.

3. Check the accumulator belt assembly for mis-alignment

4. Replace the transfer roller.

5. Replace the high-voltage power supply.

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Blank Prints

The entire image area is blank.

1. Generate a 100% “Solid Fill Test” print from the front panel.

2. Open the door in the middle of the print job. Is there toner on the Accumulator Belt?

3. Enter service diagnostics and test the shutter motor. Does the laser shutter motor work properly? Remove an imaging unit and see if the shutter opens and closes freely.

4. Inspect the wiring harness for loose or disconnected wiring connectors; check connectors P400 and P401 at the engine control board.

5. Print the “Engine Test Prints”. If the test prints are free from defects, replace the Image processor Board. If the test prints show defects, replace the engine control board.

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Print-Quality Troubleshooting 5-15

One Color Is Faded or Missing

1. Under high toner-coverage conditions, toner may be depleted during the toner low state but before the toner out message is displayed

2. Is the toner low or near empty? Remove the toner cartridge and inspect the top of the feed tube. Replace the toner cartridge if necessary. Ensure that genuine Xerox toner is installed.

3. Run the Calibrate for Paper routine.

4. Check the transfer setting before running calibrate paper. If the value is -4, you need to adjust the transfer settings.

5. Remove the imaging unit and verify that the laser shutter opens and closes using the Service Diagnostics Shutter Solenoid test.

6. Inspect and test the toner auger system. Ensure that the toner auger motor operates. Ensure that the toner dispense assembly is carrying toner from the toner cartridge to the developer.

7. Remove the accumulator belt assembly and inspect the high-voltage connectors on the back side to ensure they are not damaged.

8. Inspect the high-voltage wiring leading to the accumulator belt assembly for damage.

9. Verify that the developer is seated properly.

10. Replace the developer beads.

11. If the missing or faded primary color appears as speckle on the entire page, the high-voltage wire leading to that color’s developer housing is grounded. Inspect the high-voltage wiring harness and power supply. Repair/replace as necessary.

12. Replace the laser unit.

13. Swap the leads of the affected color with another color on the T2 HVPS. If the symptom changes, replace the T2 high-voltage power supply.

14. Replace the T3 high-voltage power supply.

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Missing Band in Direction of Paper Travel, All Colors

There are areas of the image that are extremely light or are missing entirely. These missing areas form wide bands from leading edge to trailing edge (B-size print shown). The printer displays no error code.

NoteA-size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path, making print artifacts parallel to the short edge of the print.

1. Clean the laser windows with the cleaning wand located in the front door.

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Leading Edge

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Print-Quality Troubleshooting 5-17

Streaks in Direction of Paper Travel

There are dark lines running along the page in the direction of paper travel from the leading edge to the trailing edge (B-size print shown). The printer displays no error code.

NoteA-size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path. B-size prints are processed through the printer with the long edge of the print parallel to the paper path, making horizontal artifacts parallel to the long axis of the print.

1. Run the solid fill test pages: From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Solid Fill Pages. If the missing bands only occur in a single primary color, replace the imaging unit of the affected color or, swap imaging units and run another test print.

NoteUnder some circumstances, streaking may occur in the margin of SRA3-size paper. This is due to the edges of the paper extending beyond the end of the imaging components. Print-quality in the margins of SRA3 paper is not guaranteed.

2. Print the repeating defects page, do the lines/streaks align with any of the repeating defect marks?

3. Inspect the accumulator belt cleaner; replace the cleaner, if necessary.

4. Replace the developer housing assembly, if the defect is in one color only.

5. Run the Remove Print Smears routine. If the defect returns, replace the fuser.

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Leading Edge

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Streaks Parallel With the Leading Edge

There are dark lines running parallel with the leading edge of the print, perpendicular to direction of paper travel (B-size print shown). The printer displays no error code.

NoteA-size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path, making print artifacts parallel to the long edge of the print.

B-size prints are processed through the printer with the long edge of the print parallel to the paper path, making artifacts parallel to the short axis of the print.

1. Inspect the paper that is loaded in the paper tray. Is the paper wrinkled, dimpled, or show any signs of having a high moisture content?

2. Does the band repeat at a specific interval? If so, troubleshoot using the “Repeating Defects Page”.

3. Run the Remove Print Smears routine. From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Remove Print Smears.

4. If the engine test prints are all okay, but prints from an application or the image processor board are not, replace the image processor board.

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Leading Edge

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Print-Quality Troubleshooting 5-19

Banding

1. Print the “Repeating Defects Pages”.

2. Replace the unit of the affected color, using the repeating defects page.

3. If the defect still appears in the same color, the problem is the developer.

4. If all colors, the problem is with the accumulator belt, belt cleaner, transfer roller, or fuser.

Random Spotting

There are spots of toner randomly scattered across the page. The printer displays no error code.

Single Color

1. Inspect the toner cartridge for toner clumping.

2. Check the imaging units.

All Colors

1. Inspect the paper path.

2. Inspect the accumulator belt cleaner and replace, if necessary.

3. Inspect the transfer roller and replace, if necessary.

4. Replace the fuser.

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Repetitive Mark Appears on Each Print

An identical mark or image appears on each, or every other, printed image.

From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Remove Print Smears. This function passes several blank sheets of paper through the printer to clean the fuser rollers.

From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Repeating Defects Page. The “Repeating Defects Page” contains rulers to help determine the source of the repeating defects.

84 mm (3.3 in.) Fuser

94 mm (3.7 in.) Fuser (mark in all colors) or imaging unit (mark in single color)

88 mm (3.5 in.) Transfer roller (2nd bias)

44 mm (1.7 in.) Imaging unit

28.3 mm (1.1 in.) Developer housing roller

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Print-Quality Troubleshooting 5-21

Random Missing Spots

There are small areas of the image that are extremely light or are missing entirely. These missing areas form spots that are localized to small areas of the page. The printer displays no error code. A small number of occasional missing spots is normal.

1. If a toner low message is displayed, replace the toner cartridge in question.

2. Ensure that the loaded media matches the front panel settings.

3. Try using an approved media to see if the spots still appear.

4. Run the Calibrate for Paper routine. From the front panel’s Printer Setup Menu, select Calibration Setup, then select Calibrate for Paper.

5. This could be cold offset. Set the paper type at the printer’s front panel to one type heavier.

6. Run the solid fill test pages. From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Solid Fill Pages.

7. If the missing spots only occur in a single primary color, replace the developer housing assembly.

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Background Contamination

There is toner contamination on all or most of the page. The contamination appears as a very light gray dusting. The printer displays no error code.

1. Ensure that the loaded media matches the front panel settings. In some cases, switching the paper type setting, for example from Heavy Laser Paper to Thin Cover/Index, may improve print quality.

2. Run the Calibrate for Paper routine. From the front panel’s Printer Setup Menu, select Calibration Setup, then select Calibrate for Paper.

NotePrinting on some specialty papers, such as some glossy finish papers may show some background contamination.

3. Inspect the imaging units for contamination. Replace the imaging units, if necessary.

4. If the transfer roller or belt cleaner assembly is near the end of its life, replace that part.

5. If the background contamination is a primary color (and that primary color is missing from the print), the high-voltage wire leading to that color’s developer housing is grounded. Inspect the high-voltage wiring harnesses.

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Print-Quality Troubleshooting 5-23

Unfused Image or Image Easily Rubs Off of Page

The toner image is not completely fused to the paper. The image easily rubs off. The printer displays no error code.

1. Make sure that the paper you are using is the correct type for the printer and is correctly loaded in the printer in the correct tray. From the front panel’s Information Pages Menu, select Paper Tips Page.

2. Make sure that the paper loaded in the tray matches the paper type selected on the printer’s front panel.

3. If the problem continues, set the paper type in the front panel to the next heavier type of paper than what you are using. Below is a list of paper types from the heaviest weight to the lightest:Thick Cover/IndexThin Cover/IndexHeavy Laser PaperLaser Paper

4. Check for paper wrapped around or blocking the fuser roller. Inspect the fuser roller for damage. Replace the fuser, if necessary.

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Toner on Back of Print

There is toner on the back of the printed sheet of paper.

1. Clean the printer interior.

2. Inspect the paper that is loaded in the paper trays. Is the paper clean and free of toner?

3. Try printing from supported media.

4. Ensure that the loaded media matches the front panel settings. In some cases, switching the paper type setting, for example from Heavy Laser Paper to Thin cover/Index, may improve print-quality.

5. Run fuser cleaning pages.

6. After the fuser has been cleaned, try setting the paper selection one type heavier.

7. If the transfer roller or belt cleaner assembly is near the end of its life, replace that part.

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Print-Quality Troubleshooting 5-25

Print Is Mottled

The printed image has a mottled appearance.

1. Ensure that the paper is in good condition and appropriate for a laser printer.

2. Ensure that the loaded media matches the front panel settings. Also check the media selected in the printer driver.

3. Ensure supported media is being used.

4. For specialty papers, experiment with alternate paper type settings such as Heavy Laser Paper, Thick Cover/Index or others.

5. Run the Calibrate for Paper routine. From the front panel’s Printer Setup Menu, select Calibration Setup, then select Calibrate for Paper.

NoteVerify the settings. Be sure the setting is not at +4 value before running Calibrate for Paper. Tray1 (MPT) must have the right setting to run calibrate for paper.

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Image Mis-Registered on Paper

The image area is not centered on the page or the image is bleeding off of the page. The printer displays no error code.

1. Run the “Configuration Page” or “Startup Page” to verify the hard drive, application, and driver settings. From the front panel’s Information Pages Menu, select Configuration Page or Startup Page.

2. Is the correct weight paper loaded in the tray?

3. Ensure that the paper guides are set to the correct position for the paper loaded in the tray.

4. Try printing from the other trays. If the problem only occurs from one tray, clean the rollers in that tray.

5. Run the Calibrate Margins routine. From the front panel’s Printer Setup Menu, select Calibration Setup, then select Calibrate Margins.

6. Verify that Tray 1/MPT or Tray 2 has not been inadvertently set to custom width while standard sized paper is installed.

7. Verify that the front Tray 1/MPT guide is in the correct position.

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Residual Image or Ghosting

There are faint, ghostly images appearing on the page. The images may be either from a previous page or from the page currently being printed. The printer displays no error code.

1. Make sure that the paper you are using is the correct type for the printer and is correctly loaded in the printer. From the front panel’s Information Pages Menu, select Paper Tips Page.

2. Make sure that the paper loaded in the tray matches the paper type selected on the printer’s front panel.

3. Ensure that genuine Xerox toner is installed in the printer.

4. If the problem continues, set the paper type in the front panel to the next lightest type of paper than what you are using.

5. If the colors are offset by only a small amount (10 mm maximum), then calibration of the laser may be needed. This is mis-registration, not ghosting. Go to "Image Mis-Registered on Paper" on page 5-26.

6. If the ghosting is offset by 84 mm, run the Remove Print Smears routine to clean the fuser. From the front panel’s Troubleshooting Menu, select Print Quality Problems, then select Remove Print Smears.

7. Inspect and replace the fuser, if necessary.

NoteSome ghosting may appear on transparency film and is a limitation of the printer.

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6Chapter

Adjustments and CalibrationsThe engine firmware has several built-in diagnostic routines that perform various alignment and calibration procedures. The printer is shipped aligned, registered and calibrated.

In this chapter...■ Registration Control (RegiCon) Adjustment Overview

■ RegiCon Adjustment Procedures

■ ATC Sensor Setup

■ Resetting NVRAM

■ Service Diagnostics PostScript NVRAM Resets

■ Clear Tech Rep Faults

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Registration Control (RegiCon) Adjustment Overview

The RegiCon tests are the means by which registration is accomplished. Registration establishes the alignment of the four primary colors in the process and scan directions, tilt or skew, length of lines and linearity. When the registration process is completed, all color planes are positioned properly.

The RegiCon Adjustment procedures should be used whenever the technician replaces the Laser Unit or where color registration is bad.

The printer registration process consists of the following adjustments and is briefly summarized in this overview:

■ Fine Skew Adjustment

■ In/Out Skew Adjustment

■ Center Skew Adjustment

■ Coarse Skew Adjustment

RegiCon is the procedure by which the printer aligns the magenta, yellow and black vertical and horizontal scan lines to the cyan reference scan line. Horizontal and vertical alignment ensures that the magenta, yellow and black lines are superimposed on Cyan.

NoteCyan is the reference color to which all other colors are aligned.

Figure 1: Horizontal and VerticalMargins

S7700-460

M, Y, K

Cyan

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Coarse and Fine Skew Adjustments

Skew error is the misalignment of one or more of the four scan lines (C, M, Y & K). During the RegiCon #4 (Coarse) and RegiCon #1 (Fine) adjustments, the front side of each line is adjusted to be level with the rear end.

In/Out Skew Adjustment

The In/Out Skew Adjustment (Magnification) ensures that all four scan lines are the same length. During RegiCon #2, the printer measures, then adjusts the four scan lines to the proper length.

Figure 2: Skew Adjustment

S7700-461

Reference Line

Figure 3: Magnification

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Center Skew Adjustment

The Center Skew Adjustment (Magnification Balance) adjusts the linearity of the scan lines. During RegiCon #3, the printer measures a specific midpoint of each scan line and adjusts it to a horizontal reference midpoint.

Figure 4: Magnification Balance

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Center Reference

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RegiCon Adjustment Procedures

NoteFor the following procedures, you must perform certain steps prior to, during, and after the tests are run. The following information is vital to the process and must be followed in order for each procedure to function properly.

■ RegiCon fails if there are any print-quality problems. Diagnose and repair any print-quality problems before running any RegiCon procedure. To resolve a print-quality problem, see “"Print-Quality Troubleshooting" on page 5-1.

■ You must enter the Hidden Service Menu from the Troubleshooting/Service Tools Menu to perform each test. Go to the front panel Troubleshooting/Service Tools/Printer Status Page menu, and press and hold the Up button, then press the Down button. This will display the Hidden Service menu. Then scroll to RegiCon Setup Cycle and press Enter to display the RegiCon test menu.

■ The procedures are listed in the order they need to be performed for optimal adjustments.

Troubleshooting Procedure

Step Actions and Questions Yes No

1 1. Enter service diagnostics and print the Grid 1-Dot test print.

2. Do all the colors align correctly?

Complete. Color registration problem is not related to RegiCon.

Go to step 2.

2 1. Perform the procedure "Resetting Engine NVRAM" on page 6-17 using the original hard drive from the printer, if the hard drive has been replaced.

2. Reprint the Grid 1-Dot test print.

3. Do all the colors align correctly now?

Complete. Go to step 3.

3 1. Perform the "RegiCon #1 Fine Skew Adjustment" on page 6-7.

2. Do the results indicate the test has passed?

Perform skew correction adjustments as indicated in the second panel data until less that +/- 5 clicks are required for each color.Go to step 4.

Go to step 8.

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4 1. Perform the "RegiCon #2 In/Out Skew Adjustment" on page 6-8.

2. Do the results indicate the test has passed?

Perform skew correction adjustments as indicated in the panel data until less that +/- 5 clicks are required for each color.Go to step 5.

Go to step 8.

5 1. Perform the "RegiCon #3 Center Skew Adjustment" on page 6-9.

2. Do the results indicate the test has passed?

Go to step 7. Go to step 6.

6 1. Verify the MOB sensor is correctly positioned in the center and repeat the RegiCon #3 test.

2. Does the test pass now?

Go to step 7. Diagnose and repair the MOB sensor.

7 1. Print the Grid 1-Dot test print.

2. Do the colors all align correctly?

Complete. Follow the procedure "Store Engine NVRAM" on page 6-21.

Go to step 8.

8 1. Perform the "RegiCon #4 Coarse Skew Adjustment" on page 6-10.

2. Do the results indicate the test has passed?

Perform the skew correction adjustments as indicated in the panel data, only until the test passes, then go back to step 3.

Perform the "Coarse RegiCon Initialization" on page 6-12, then repeat this step.

Troubleshooting Procedure

Step Actions and Questions Yes No

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RegiCon #1 Fine Skew Adjustment

This process uses sensors to examine the RegiCon image on the belt and report what adjustments need to be made. A side effect of this test is that horizontal and vertical alignments are automatically done (if the test passed).

The data output presents the skew screw adjustment values (some number of "clicks" of the screw, either CW or CCW direction). Values less than 5 or so are "noise" and should not need to be adjusted.

1. From the Hidden Service menu, highlight the RegiCon Setup Cycle menu and press OK.

2. The first time any RegiCon test is requested, the pages used to perform the test must be created, so there is a short delay. During this time the front panel displays “Processing Data - Please Wait”

3. Highlight Do #1 Fine Skew Setup and press OK. The front panel now displays: Testing - Please Wait.

4. Wait until the test results are displayed as follows:

NoteOnly 5 lines will be displayed at a time under the Information header. Use the arrow buttons to scroll down or up as required to see the rest of the data.

NoteIf the block counts are not the same number as presented here, the printer has a print-quality problem. See "Streaks in Direction of Paper Travel" on page 5-17 to resolve the print-quality problems before proceeding further with RegiCon.

5. If an adjustment is needed, adjust by the amounts displayed on the front panel until all clicks displayed are 5 or less.

NoteIf RegiCon #1 Fine Skew test fails, see "RegiCon #4 Coarse Skew Adjustment" on page 6-10.

Fine Skew Setup

Yellow 1 Click CWMin B Blocks: 4Min A Blocks: 24Passed

Magenta 7 Clicks CCWCyan 7 Clicks CWBlack 7 Clicks CCW

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6. After 2 minutes, the test selection menu will re-appear. To examine the test results after this occurs, highlight the appropriate test and press the Information button. The display results are the same as previously except that Do #1: Fine Skew Setup appears as the first text below the line.

RegiCon #2 In/Out Skew Adjustment

This test makes "magnification" adjustments for registration. Magnification is the length of the scan line for the four colors, so that each scan line for each color is the same length.

The data output can indicate PASSED, or READJUST (PASSED), or FAILED. If the result is READJUST, the indicated adjustment values for the skew adjustment should be done. It should not be necessary to rerun the test after making this adjustment.

1. From the Hidden Service menu, highlight the RegiCon Setup Cycle menu and press OK.

2. The first time any RegiCon test is requested, the pages used to perform the test must be created, so there is a short delay. During this time the front panel displays “Processing Data - Please Wait”

3. Highlight Do #2 In/Out Skew Setup and press OK. The front panel now displays: Testing - Please Wait.

4. Wait until the test results are displayed as follows:

Or

NoteIf the block counts are not the same number as presented here, the printer has a print-quality problem. See "Streaks in Direction of Paper Travel" on page 5-17 to resolve the problems before proceeding further with RegiCon.

In/Out Skew Setup

Min B Blocks: 0Min A Blocks: 24Passed

In/Out Skew Setup

Black 5 Clicks CCWCyan 5 Clicks CWMagenta 1 Clicks CCWYellow 2 Click CWMin B Blocks: 0Min A Blocks: 24Passed Readjust

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5. If an adjustment is needed, adjust by the amounts displayed on the front panel.

6. After 2 minutes, the test selection menu will re-appear. To examine the test results after this occurs, highlight the appropriate test and press the Information button. The display is the same as previously except that Do #2: In/Out Skew Setup appears as the first text below the line.

When RegiCon #1 or RegiCon #2 Fails

The horizontal alignment error is excessive and a manual adjustment is required before the diagnostics test routines for fine skew can pass. Perform the Coarse RegiCon Init procedure, see "Coarse RegiCon Initialization" on page 6-12.

RegiCon #3 Center Skew Adjustment

This test adjusts magnification balance. There are no manual adjustments required after completing the test.

NoteTo perform this test, move the mark-on-belt sensor to the CENTER position. After the test has been run, the mark-on-belt sensor must be moved back to the home position.

1. Remove the waste cartridge.

2. Remove the screw that holds the mark-on-belt (MOB) sensor to the front of the printer.

3. Using the laser lens cleaning tool, move the sensor all the way to the CENTER position (until it hits the stop).

4. Reinstall the waste cartridge.

5. Close the door and run the test.

6. From the Hidden Service menu, highlight the RegiCon Setup Cycle menu and press OK.

7. The first time any RegiCon test is requested, the pages used to perform the test must be created, so there is a short delay. During this time the front panel displays “Processing Data - Please Wait”

8. Highlight Do #3 Center Skew Setup and press OK. The front panel now displays: Testing - Please Wait.

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9. Wait until the test results are displayed as follows:

NoteIf the block counts are not the same number as presented here, the printer has a print-quality problem. See "Streaks in Direction of Paper Travel" on page 5-17 to resolve the print-quality problems before proceeding further with RegiCon.

10. Using the back of the laser cleaning tool, hook the loop of the MOB sensor (just moved in step 3 above) and pull it all the way to the front. Continue holding the MOB Sensor in position while reinserting the securing screw (removed in step 2 above).

When RegiCon #3 Fails

This is probably due to the mark-on-belt sensor not being positioned properly (assuming that RegiCon 1 and 2 tests have already passed). The sensor has a "wedge-fit" when in position for the number 3 "center" position. If the mark-on-belt sensor not correctly positioned, it can cause the test to fail. Recheck the MOB sensor position and run the test again.

RegiCon #4 Coarse Skew Adjustment

1. From the Hidden Service menu, highlight the RegiCon Setup Cycle menu and press OK.

2. The first time any RegiCon test is requested, the pages used to perform the test must be created, so there is a short delay. During this time the front panel displays “Processing Data - Please Wait”

3. Highlight Do #4 Course Skew Setup and press OK. The front panel now displays: Testing - Please Wait.

NoteWhile the correct spelling for this test should be “Coarse” firmware currently contains the improper spelling “Course”.

Center Skew Setup

Black 0 Clicks CCWCyan 0 Clicks CWMagenta 0 Clicks CCWYellow 0 Click CWMax B Blocks: 4Min A Blocks: 24Passed

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4. Wait until the test results are displayed as follows:

NoteIf the block counts are not the same number as presented here, the printer has a print-quality problem. See "Streaks in Direction of Paper Travel" on page 5-17 to resolve the print-quality problems before proceeding further with RegiCon.

If RegiCon Coarse Skew Fails

This indicates that the horizontal alignment is so far out of adjustment that a manual adjustment is required before the diagnostics test routines for fine skew can pass. Other possible problems; a Mark-On-Belt Sensor failure, Developer, Developer Bias Voltage, Imaging Unit, or Engine Control Board Failure.

■ Perform the "Coarse RegiCon Initialization" on page 6-12. This adjusts the horizontal alignment closer and allows RegiCon #4 to pass.

■ After Coarse RegiCon Initialization is complete, perform RegiCon #4 (Coarse Skew Adjustment) again. Make the required adjustments.

Adjustments should be made only if the skew correction indicated is greater than five clicks.

Adjustment screws are located behind the waste cartridge, which must be removed for access. From left to right, the adjustment screws are: K, C, M, and Y.

Course Skew Setup

Black 46 Clicks CWCyan 47 Clicks CWMagenta 47 Clicks CWYellow 40 Click CWMin B Blocks: 4Min A Blocks: 0Passed

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Coarse RegiCon Initialization

1. From the Hidden Service menu, highlight Run Service Diagnostics and press OK. Wait for the printer to initialize in the Service Diagnostics mode.

2. Highlight the Adjustments/Calibrations menu and press OK.

3. From the select Adjustments/Calibrations menu select the Coarse RegiCon Init test and press OK.

a. After NVRAM values are read, the test asks Set Factory Defaults? Yes/No, then select Yes.

b. This sets the horizontal and vertical alignment to centered values. At this time, it should not be necessary to reset the magnification or magnification balance values, so select No to Set Skew Error Thresholds? Yes/No.

NoteIn all the following steps, Cyan is the reference line and cannot be adjusted, so you need to adjust all the other lines towards the Cyan line.

4. From the Built-in Test Prints menu, select Print Grid 1-Dot.

a. This print shows the relative error between the C and MYK scan lines. Always indicate which edge of the print comes out of the printer first to be certain which way is Left/Right or Up/Down (see Figure 4-6 “Grid 1-Dot pattern orientation for A-size paper”). Measure the distance (in millimeters) between the vertical lines, with the Cyan line being the reference line.

b. It is best if the default paper tray contains A-size paper.

c. Note the leading edge of the paper when removing the test print from the tray. Use a pen or pencil to note the leading edge as the “TOP” of the print “Grid 1-Dot pattern annotations” on page 16. With “TOP” up, note the

Top

S7700-464-b

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direction of scan from left to right as the “FAST ” direction. The direction from the bottom of the print to the top is referred to as the “SLOW” direction.

d. Notice which vertical line color(s) on the print needs to be moved right or left to line up as closely as possible with the cyan color line.

e. Measure how much each line needs to move (in millimeters) and whether it must be moved left or right.

NoteCyan is the reference color and does not move. Make the adjustments of M, Y, and K toward Cyan.

5. From the Adjustment/Calibrations menu, select Coarse RegiCon Init test.

a. This time answer No to the Set Factory Defaults? Yes/No,

b. Answer Yes to the Do you want to adjust NVRAM? Yes/No question.

c. Answer No to Set Skew Error threshold? Yes/No.

d. Answer Fast to the Which scan direction? Fast/Slow.

6. Select which color (of YMK) to adjust. Select how many millimeters (1-5) to adjust. Select which direction (Left/Right). The next screen asks for confirmation: {Adjust <color> by <n> mm? Yes/No}, select Yes.

7. Reprint the Grid 1-Dot pattern to verify changes.

8. Print the Grid 1-Dot page to see if the vertical lines are all clustered within 1 mm of the Cyan line. If not, repeat.

9. If the adjustments are no longer having an effect or the lines move in the opposite direction selected, go back to Step 5 and answer Yes to Set Factory Defaults. Now go through Steps 5 through 8 again. If the results are still not satisfactory, examine the chevron pattern on the belt during Regicon.

Top

RightLeft Fast

Slow

Down

Up(Leading edge into

output tray)

RightLeft Fast

Slow

Down

Up

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(Leading edge intooutput tray)

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ATC Sensor Setup

The automatic toner concentration (ATC) sensor measures the toner to bead ratio in each developer. These sensors have an intrinsic gain and output value that are stored in printer NVRAM. New values must be entered when a new developer housing is installed. Incorrect values have color balance effects.

On the side of each developer housing assembly is a small tag with a bold-faced three-digit number printed near the bottom. The first digit is always "0." The other digits range between 0 and 99.

To set the new values:

1. Enter Service Diagnostics.

2. Highlight Adjustments/Calibrations menu and press OK.

3. Highlight ATC Sensor Setup Test and press OK.

4. Note the current values for the tag numbers on the front panel display. They should correspond to the tag numbers of the developers actually installed.

5. Select the color of the developer you installed.

6. Enter the tag number. Use the Back and Info buttons to select which digit you want to change. Use the Up and Down buttons to actually modify the digit.

7. Press OK to enter the data in engine NVRAM.

8. Press any button to abort the test.

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Additional Information

For information on the following topics, see, "Service Diagnostics" on page 4-2.

■ TRC Adjust

■ ADC Output Check - Check ADC Sensor Fail = 0

■ Tone Up/Down - Check ATC Sensor Fail = None

■ Laser Power Check

■ PWM Mapping - For Engineering Use Only

Storing NVRAM Values on the Hard Drive

The Phaser 7750 printer has a hard drive installed in every printer. The hard drive boots the PostScript firmware. There is a special file on the hard drive that stores the specific calibration values for various sensors and for the laser in the printer.

■ During manufacturing, the calibration values from the engine NVRAM have been written to the hard drive. The stored values can be written back to the engine NVRAM by performing a front panel “Restore Engine NVRAM Now” reset procedure.

■ If "restore" engine NVRAM does not restore correct color registration, the RegiCon procedure must be performed. After completing the RegiCon process, perform the engine NVRAM "store" function to store the new engine NVRAM values to the hard drive.

■ If the hard drive needs to be replaced, there is an engine NVRAM "store" function in the service diagnostics that enables the current engine NVRAM values to be written to the new hard drive.

■ If the engine control board is replaced, the NVRAM values on the hard drive need to be written to the new board with the engine NVRAM "restore" function.

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Resetting NVRAM

Resetting NVRAM returns all the image processor’s NVRAM-stored parameters to their factory defaults except the print counts and the Adobe firmware serial number. You can reset both the PostScript and engine NVRAM using the PostScript Menu or the Service Diagnostics Menu.

PostScript NVRAM Resets

Restore Factory Settings (Color)

You can reset settings for density and color balance to the factory-default values.

1. From the Main Menu, highlight Printer Setup and press OK.

2. Highlight Calibration Setup and press OK.

NoteAn alternate access pathway from the Main Menu is Troubleshooting/Print Quality Problems.

3. Highlight Calibrate Colors and press OK.

4. Highlight Restore Factory Settings and press OK.

5. Highlight Restore Factory Settings NOW and press the OK to reset the color settings to factory defaults.

Restore Previous Settings (Color)

You can return the color settings to the ones that existed before you saved the last color balance adjustments.

1. From the Main Menu, highlight Printer Setup and press OK.

2. Highlight Calibration Setup and press OK.

NoteAn alternate access pathway from the Main Menu is Troubleshooting/Print Quality Problems.

3. Highlight Calibrate Colors and press OK.

4. Highlight Restore Previous Settings and press OK.

5. Highlight Restore Previous Settings NOW and press OK to restore the previous color settings.

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Restore Factory Settings (Margins)

You can reset margin settings to the factory-default values.

CautionUse caution when resetting margins to the factory-default settings. Changing these settings back to factory defaults may not be the last-saved settings if you have previously calibrated your margins.

1. From the Main Menu, highlight Printer Setup and press OK.

2. Highlight Calibration Setup and press OK.

NoteAn alternate access pathway from the Main Menu is Troubleshooting/Print Quality Problems.

3. Highlight Calibrate Colors and press OK.

4. Highlight Calibrate Margins and press OK.

5. Highlight Restore Factory Settings and press OK to reset the margin settings.

Resetting All Printer Default Settings (NVRAM)

Resetting the NVRAM resets all printer values including network, printer setup, job defaults, color, margin, and paper calibrations.

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Highlight Reset NVRAM and press OK.

4. Highlight Reset NVRAM and Reset Printer NOW and press OK to reset all the settings to default.

Resetting Engine NVRAM

Resetting (restoring) the engine NVRAM values resets the RegiCon, color, margin and A4/B5 selection paper settings to default. This is NOT the diagnostics reset.

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Highlight Reset NVRAM and press OK.

4. Highlight Reset Engine NVRAM NOW and press OK.

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Resetting Paper Handling Defaults

Resetting the paper handling defaults resets the paper source, paper destination, job offset, stapling options, print-quality mode, 2-sided printing, image smoothing and TekColor corrections to their default values.

1. From the Main Menu, highlight Printer Setup and press OK.

2. Highlight Paper Handling Setup and press OK.

3. Highlight Reset Paper Handling Setup and press OK.

4. Highlight Reset Paper Handling Setup NOW and press OK to reset the paper handling defaults.

Resetting Network Setup Values to Default

Resetting the network setup values resets the TCP/IP address, TCP/IP address menu settings (gateway, broadcast, etc.), CentreWare IS, EtherTalk, NetWare, set IPX frame type, IPP and Ethernet speed to their default values.

1. From the Main Menu, highlight Printer Setup and press OK.

2. Highlight Connection Setup and press OK.

3. Highlight Reset Connection Setup and press OK.

4. Reset Connection Setup NOW is displayed, press OK.

Resetting Belt Cleaner Assembly Life

Resetting the belt cleaner life is to be performed only if the belt cleaner assembly is replaced before an end-of-life or near end-of- life message. Do not to extend the life of the assembly. Doing so may cause premature failure of other internal printer components.

The printer prompts the user to reset the life counts if the assembly is replaced after receiving a Replace Belt Cleaner Assembly or Replace Belt Cleaner Assembly Soon message.

1. From the Main Menu, highlight Information and press OK.

2. Highlight Supplies Info and press OK.

3. Highlight Reset Belt Cleaner Assembly Life and press OK.

4. Reset Reset Belt Cleaner Assembly Life NOW is displayed, press OK to reset the Accumulator Belt Cleaner life.

Resetting Transfer Roller Life

Resetting the transfer roller life is to be performed only if the transfer roller assembly is replaced before an end-of-life or near end-of-life message. Do not to extend the life of the assembly. Doing so may cause premature failure of other internal printer components.

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The printer prompts the user to reset the life counts if the assembly is replaced after receiving a Replace Transfer Roller or Replace Transfer Roller Soon message.

1. From the Main Menu, highlight Information and press OK.

2. Highlight Supplies Info and press OK

3. Highlight Reset Transfer Roller Life and press OK.

4. Reset Transfer Roller Life NOW is displayed, press OK to reset the Transfer Roller life.

Service Diagnostics NVRAM Resets

PostScript NVRAM Reset

Resetting the printer setup values resets the job defaults, front panel language, Intelligent Ready, Tray 1 (MPT), tray 2- 5 setup, Startup Page, front panel intensity, front panel contrast, PostScript error information and ENERGY STAR timeout to their default values.

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Press the Up and Down buttons simultaneously to enter the Hidden Service menu.

4. Highlight Run Service Diagnostics and press OK to enter Service Diagnostics.

5. Highlight NVRAM Access and press OK.

6. Highlight PostScript NVRAM Reset and press OK.

7. Select the specific entry desired (Yes or No) and press OK.

8. The printer now exits Service Diagnostics and reboots. While booting, NVRAM is reset.

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Clear Tech Rep Faults

The following printer faults can occur during normal operation, and the normal procedure is to isolate and repair the problem. However, with these particular faults, an additional step is required. A value has been written in the engine NVRAM that requires clearing before the printer can be used. Some faults require three occurrences before the fault is generated.

NoteTo clear a Tech Rep Fault, you must disconnect the Finisher option. The following functions generate a Tech Rep Fault:

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Press the Up and Down Arrow buttons simultaneously to enter the Hidden Service menu.

4. Highlight Run Service Diagnostics and press OK to enter Service Diagnostics.

5. Highlight NVRAM Access and press OK.

6. Highlight Clear Tech Rep Faults and press OK.

7. Highlight the Link Code(s) to be reset and press OK.

Diagnostic Engine NVRAM Reset

Reset NVRAM allows PostScript to write stored data from the hard drive to engine NVRAM. You must restore engine NVRAM after replacing the Engine Control Board.

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Press the Up and Down Arrow buttons simultaneously to enter the Hidden Service menu.

4. Highlight Run Service Diagnostics and press OK to enter Service Diagnostics.

5. Highlight NVRAM Access and press OK.

Error Chain-Link

Belt Home Too Long - Error 30 04-346

ATC-YMCK Sensor Fail - Errors: 12, 13, 14, 15 09-380 thru 09-383

ADC Sensor Fail Errors 09-645

Imaging Unit YMCK Type Mismatch 09-910 thru 09-913

Fuser Main/Sub Lamp Temp Too High - Errors: 35, 44 10-348, 10-350

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6. Highlight Reset Engine NVRAM and press OK.

7. Select the specific entry desired (Yes or No) and press OK.

Store Engine NVRAM

This function reads values from the engine NVRAM and writes values to the hard drive. It overwrites NVRAM values stored on the hard drive.

You must store values to the hard drive before replacing the engine control board.

■ Engine Control Board

You must store engine NVRAM values to the hard drive after replacement of the hard drive.

1. From the Main Menu, highlight Troubleshooting and press OK.

2. Highlight Service Tools and press OK.

3. Press the Up and Down Arrow buttons simultaneously to enter the Hidden Service menu.

4. Highlight Run Service Diagnostics and press OK to enter Service Diagnostics.

5. Highlight NVRAM Access and press OK.

6. Highlight Store Engine NVRAM and press OK.

7. Select the specific entry desired (Yes or No) and press OK.

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7Chapter

Cleaning and Maintenance

In this chapter...■ Service Preventive Maintenance Procedure

■ Recommended Tools

■ Cleaning

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Service Preventive Maintenance Procedure

Perform the following procedures whenever you check, service, or repair a printer. Cleaning the printer, as outlined in the following steps, assures proper operation of the printer and reduces the probability of having to service the printer in the future.

The frequency of use and the type of paper a customer prints on determines how critical and how often cleaning the machine is necessary. Record the number of sheets printed.

Recommended Tools

■ Toner vacuum cleaner Type II

■ Clean water

■ Clean, dry, lint-free cloth

■ Black light protective bag

Cleaning

CautionNever apply alcohol to any parts in the printer. Never use a damp cloth to clean up toner.

CautionIf you remove the Imaging Unit, place it in a light protective bag.

1. Record number of sheets printed.

2. Print several sheets of paper to check for problems or defects.

3. Turn OFF the printer.

4. Remove any debris or foreign objects.

5. Vacuum out any loose toner from the interior of the printer with a Type II toner vacuum only.

6. Remove and clean the paper trays.

7. Clean pick rollers with a slightly damp, lint-free cloth.

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8Chapter

Service Parts Disassembly

In this chapter...■ Overview

■ General Notes on Disassembly

■ Disassembly Procedures

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8-2 Phaser 7750 Printer Service Manual

Overview

This section contains the removal and replacement procedures for selected parts of the printer according to the Service Parts List. Not all replacement procedures are included in this Service Manual. In most cases, to reinstall a part, simply reverse the removal procedure shown. In some instances, the replacement procedure is included because it may contain special steps. For specific assemblies and parts, refer to "Service Parts Lists" on page 9-1.

Standard Orientation of the Printer for Disassembly

When needed the orientation of the printer is called out in the procedure for locating printer parts, refer to the printer orientation graphic for locating the right, left, front and back sides of the printer.

7750-242

Back

Front

Right

Left

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Service Parts Disassembly 8-3

General Notes on Disassembly

Before You Begin Any Disassembly Procedure:

1. Switch OFF the printer power and disconnect the power cord from the wall outlet.

2. Remove the Imaging Units and protect them from exposure to light by covering with a light proof bag or by placing in a light-tight container. Disconnect all computer interface cables from the printer.

3. Wear an electrostatic discharge wrist strap to help prevent damage to the sensitive electronics of the printer circuit boards.

CautionMany parts are secured by plastic tabs. DO NOT over Flex or force these parts. Do not over torque the screws threaded into plastic parts. Always use the correct type and size screw. Using the wrong screw can damage tapped holes. Do not use excessive force to either remove or install either a screw or a printer part. When replacing a screw in plastic, rotate it CCW until you feel it fall into the original threads then tighten the screw normally.

NoteNames of parts that appear in the disassembly procedures may not be exactly the same as the names that appear in the Parts List. For example; a part called the Registration Chute Assembly may appear on the Parts List as Assembly, Chute REGI.

WarningUnplug the AC power cord from the wall outlet before removing any printer part.

Notations in the Disassembly Text

■ The notation “(item X)” points to a numbered callout in the illustration corresponding to the you disassembly procedure being performed.

■ The notation “PLX.X.X” indicates that this component is listed in the Parts List.

■ Bold arrows in an illustration show direction of movement when removing or replacing a component.

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8-4 Phaser 7750 Printer Service Manual

Covers

Right Side Cover

1. Open the front cover.

2. Remove 3 screws; 1 screw is located behind the right-hand door.

3. Lightly press downward to release the four hidden tabs behind the right side cover, then pull the cover away from the printer.

S7700-033

Right-Hand Door

Tabs (4x)

FinisherJ800

Page 217: Phaser 7750 Service Manual

Service Parts Disassembly 8-5

Top Cover and Front Panel

1. Remove the right side cover, see page 8-4.

2. Remove 2 screws visible on the right side of the top cover.

3. Open the front cover and remove 1 front screw holding the top cover.

4. Remove the plastic access cover, then remove the image processor board metal cover and disconnect the front panel cable from the Relay Board P564.

5. Remove the top cover.

Front Panel Removal

1. Open the front door.

2. Release the front panel assembly by inserting a screwdriver or button into the two access holes indicated in the illustration and push the tabs inward to release.

3. Lift up the panel slightly and unplug the cable connected to the front panel.

4. Release the two tabs on the left-hand end of the front panel assembly and remove.

S7700-270

AccessHoles

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8-6 Phaser 7750 Printer Service Manual

Rear Cover

1. If an auxiliary feeder has been installed, open the auxiliary feeder connection cover and disconnect the auxiliary feeder wiring harness before removing the rear cover.

2. Remove 4 screws securing the rear cover to the printer.

3. Pull the top edge of the rear cover assembly about one inch away from the printer, and push down to release the cover.

7750-160

Cover, TopRear, PS

Left Hand, Rear,Mid Cover

Rear Cover

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Service Parts Disassembly 8-7

Top Rear Cover

1. Remove the rear cover, see page 8-6.

2. Open the Left-Hand Door A.

3. Loosen 1 screw from the top rear cover.

4. There is a hidden captive tab on the front and side of this cover that resists the upward pull. Place your finger on the front side of the cover to release the tab and pull towards you.

Cover, Left-Hand Rear, Mid

1. Remove the rear cover.

2. Remove 1 screw from the Left-Hand Rear Mid Cover.

3. Open the Left-Hand Door.

4. Lift the cover up to release captive hooks then toward you out of the printer.

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8-8 Phaser 7750 Printer Service Manual

Left-Hand Lower Cover Assembly

1. Open the Left-Hand Lower Cover.

2. Disconnect the wiring harness and free from the clamp near the rear pivot.

NoteNote the positioning of the wiring harness for reinstallation.

3. With a flat tip screwdriver, pry out the pivot pin, then pry out the pivot pin expansion sleeve.

4. Remove the Left-Hand Lower Cover.

7750-126

Page 221: Phaser 7750 Service Manual

Service Parts Disassembly 8-9

Tray 1 / Multi-Purpose Tray (MPT)

1. Remove the Rear and Mid Covers, see page 8-6.

2. Open the Left-Hand Cover.

NoteNote the routing of the wiring harness. The wiring harness feeds through the access hole at the pivot point and up to the connector. When reassembling, be sure the wire harness is behind the mounting tab.

3. Disconnect the wiring harness and clip from the printer’s frame and pull the harness through the access hole.

4. Remove 2 screws securing Tray 1 and then pull the assembly out of the printer. A slight lift on the right-hand side of the assembly may help remove it from the printer.

Reinstallation Procedures:

NoteThe duplex chute must be in the up position to install Tray 1. Open Door A, position the chute in the proper position, and then close the door.

CautionWhen reinstalling Tray 1, make certain you DO NOT pinch the wire between the left bracket and the left screw hole.

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8-10 Phaser 7750 Printer Service Manual

Tray 1 / MPT Paper Pick Rollers

1. Open the Left Hand Door A and locate the pick rollers near the duplex chute.

2. Lift the tab and slide the white retainers away from the pick rollers.

3. Slide the pick rollers off the retaining pins.

4. Lift and remove the pick rollers.

7750-159

WhiteRetainers

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Service Parts Disassembly 8-11

Left Cover Assembly (Left Hand Door A)

1. Remove the rear cover, see page 8-6.

2. Remove the Left Hand Rear Mid Cover, see page 8-7.

3. Remove Tray 1 /(MPT), see page 8-9.

4. Remove the fuser front cover.

5. Open the left cover.

6. Remove 1 screw from the plastic harness cover and remove the cover.

7. Disconnect 3 wiring harnesses.

8. Remove the retaining clip off the link mounting post.

9. While supporting the door, remove the link.

10. Lower the door to approximately 75-90o and lift off the pivot pins to remove.

RETAINING CLIP

75-90DEGREESPLASTIC

HARNESSCOVER

7750-014

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8-12 Phaser 7750 Printer Service Manual

Replacement Procedure

NoteReinstall the door on the hinge pins and manually align the marks on the motion damper before completing the installation. Failure to align the gears can result in binding and gear damage.

.

WHEN REASSEMBLING,ALIGN THE MARKS ONTHE FRICTION DAMPER.

7750-016

Marks onMotion Damper

Stop Pin

Hinge Pin

Page 225: Phaser 7750 Service Manual

Service Parts Disassembly 8-13

Duplex Chute

1. Remove Tray 1/(MPT), see page 8-9.

2. Open the Left Hand Door A.

3. Rotate the duplex chute downward until the keyed pivot shaft can be removed from the pivot bracket.

4. Remove the duplex chute.

NoteThe duplex chute must be in the up position to install Tray 1. Open Door A, position the chute in the proper position, and then close the door.

7750-231

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8-14 Phaser 7750 Printer Service Manual

Inverter Transport Assembly

1. Open the Left-Hand Cover Assembly (Left Door).

2. Remove the e-clip and remove the roller assembly.

3. Remove 2 screws securing the inverter transport assembly to the Left-Hand Door and remove the inverter transport assembly.

7750-135E-clip

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Service Parts Disassembly 8-15

Registration Transport Assembly

NoteDo not remove the 2 inside screws.

1. Remove Left Hand Door A, see page 8-11.

2. Remove the 2 screws from the plastic flanges that secure the transport assembly in the printer frame.

NoteNote the wiring harness position for reinstalling and make certain the wires are routed behind the black plastic cover on the Registration Transport Assembly.

3. Disconnect the wiring harness.

4. Remove the registration transport assembly.

7750-473

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8-16 Phaser 7750 Printer Service Manual

Shutter Solenoid Assembly

1. Remove Tray 1/ (MPT), see page 8-9.

2. Remove the registration transport assembly, see page 8-15.

3. For easier access you can remove the duplex chute, see page 8-13.

4. Disconnect the wiring harness from the front frame connector.

NoteNote the locating pin position, then loosen the one screw that secures the assembly to the frame and remove the shutter motor assembly.

Replacement Procedures

CautionVerify that the lever is correctly positioned in the slot on reassembly.

1. Remove the Waste Cartridge.

2. Remove the Black Imaging Unit.

3. While reinstalling the shutter motor assembly, with a flashlight, verify that the solenoid lever engages the notch in the shutter plate.

4. Tighten the mounting screw and reconnect the wiring harness.

7750-021

Page 229: Phaser 7750 Service Manual

Service Parts Disassembly 8-17

Tray 1 Feeder Assembly and Paper Lift Motor

1. Remove the Left-Hand Lower Cover Assembly.

2. Open Tray 1 halfway.

3. Disconnect the wiring harness.

4. Remove the 2 screws holding the Tray 1 feeder assembly, not the screws securing the lower tray bracket.

5. Remove the Tray 1 feeder assembly.

6. Some manipulation may be required to disengage the gears.

Removal of Motor

1. Disconnect the wiring harness from the motor.

2. Remove the two screws securing the motor to the feeder bracket.

3. Lift the motor straight out of the bracket to clear the gear on the motor shaft.

NoteWhen reinstalling the motor, it may be necessary to manually rotate the gears to mesh them with the other gears.

7750-125

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8-18 Phaser 7750 Printer Service Manual

Waste Cartridge Sensor Holder

1. Open the front door.

2. Open the waste cartridge cover.

NoteTo avoid a toner spill, use care in removing the waste cartridge.

1. Remove the waste cartridge.

2. Remove 1 screw securing the waste cartridge pivot hinge and remove the hinge and cover.

3. Remove the waste cartridge sensor holder, disconnecting wire harnesses, if necessary to replace the sensor.

7750-129

Waste CartridgeSensor Holder

FRONT

Waste Cartridge Cover

Waste Cartridge

Screw

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Service Parts Disassembly 8-19

Imaging Unit Plate Cover

1. Open the front door.

2. Remove fuser front cover.

3. Lower the main lever.

4. Slide imaging units 1 and 3 out slightly.

5. Remove 4 black screws.

6. Remove the plastic imaging unit plate cover.

7750-244

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8-20 Phaser 7750 Printer Service Manual

Dispense Assembly

NoteUse only a type II toner vacuum to clean up toner spills. Have a drop cloth available to place the removed assemblies on.

CautionThe dispense assemblies overlap and must be removed in the following order: Y - M - C - K, then reinstalled K - C - M - Y.

1. Open the Front Door.

2. Remove the Imaging Units as necessary.

NoteCover the exposed opening with a wide piece of tape to avoid spillage. The tape will not stick unless all toner is cleaned off the dispenser first. Do not overlap the tape to the base plate located behind the opening.

3. Remove the imaging unit plate cover.

4. Leave the main lever down.

Use a piece of wide tapeto cover the toner accesshole.

Close Shut-Off Gate

7750-168

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Service Parts Disassembly 8-21

5. Pull the shut off gate of each toner cartridge toward you approximately 3/4” (or 20mm) to shut off the toner supply for each toner tube (see Figure 8-26, “Dispense Assembly,” on page 8-29).

CautionBe careful when moving the stops, they are easily broken and may come out completely.

6. Remove the screw holding each dispense assembly to the printer.

7. Remove the dispense assembly by pulling both the top and bottom sections evenly away from the printer.

CautionThe flexible tubing is not secure and can come apart during removal and replacement causing toner spillage.

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8-22 Phaser 7750 Printer Service Manual

Imaging Unit Plate Assembly

CautionThe imaging units are very light sensitive. Store away from light. Do not touch the surface of the imaging units.

1. Remove the imaging units.

2. Leave the main lever down.

3. Remove the waste cartridge sensor holder, see page 8-18.

4. Remove the imaging unit plate cover, see page 8-19.

5. Remove the dispense assemblies, see page 8-20.

6. Disconnect the wiring harnesses to all four developer housing assemblies and remove them from under their retaining clips and dress the wires so they stick straight out the front of the printer.

7. Clear the wire harnesses from the guide located on the lower left side of the assembly.

Fix this picture.

7750-128

2

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Service Parts Disassembly 8-23

8. Remove the 6 chrome plated screws that secure the plate to the frame.

NoteComplete removal of the imaging unit plate assembly is not required for removal of the Developer(s). Tilt the imaging unit plate assembly forward enough to allow the developer(s) to be removed. Do not disconnect the imaging unit plate harnesses.

9. Remove 1 screw securing the left-hand inner cover and remove the cover.

10. Disconnect the wiring harness from its retaining clip.

11. Disconnect the harness.

12. Remove the imaging unit plate assembly.

7750-018

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8-24 Phaser 7750 Printer Service Manual

Replacement Procedure

NoteEnsure the developer assemblies are fully and evenly seated when reinstalling the imaging unit plate assembly. There is a locating pin at the back of each developer housing assembly.

Lightly tug the wires to ensure that they are not pinched by the plate or developers while reinstalling.

Center the connectors flat against the wire guide with the yellow developer connector further to the right.

CautionBe very careful not to catch any of the wires on the left-hand side of the plate while re-installing. There are two locating holes in the imaging unit plate assembly that correspond to locating pins on the frame of the printer. Failure to align the holes with the pins prior to tightening screws could result in bending the plate.

Imaging Unit Rail Assembly

1. Remove the waste cartridge.

2. Remove the imaging units and protect them from light.

3. Remove the imaging unit plate cover, see page 8-22.

4. Raise the main lever and loosen but do not remove the screw holding the front rail retaining bracket.

5. Disconnect the erase lamp.

6. Lower the main lever, bias the front rail retaining bracket towards the front of the printer and then remove the rail.

7. When installing the replacement rail, make sure both tabs are in the slots in the front and rear mounting brackets.

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Service Parts Disassembly 8-25

Developer Housing Assembly

NoteComplete removal of the imaging unit plate assembly is not required for removal of the developer(s). Tilt the imaging unit plate assembly forward enough to allow the developer(s) to be removed. Do not disconnect the imaging unit plate harnesses.

1. Partially remove the imaging unit plate assembly.

2. A locating pin is at the back of each developer housing assembly that matches a hole in the frame when positioned and seated correctly. A slight rotating back and forth of the assembly will help find the locating pin hole in the printer frame.

7750-020

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8-26 Phaser 7750 Printer Service Manual

Recharging a Developer Housing Assembly

CautionIf replacing a developer housing assembly, write down the new ATC tag number. Remove the tear-off ATC tag number label, and adhere it near the appropriate Imaging Unit connector on the Imaging Unit plate assembly, then perform the procedure. See "ATC Sensor Setup" on page 6-14.

NoteIt is easy to spill toner in this procedure. Use only a type II toner vacuum to clean up any spilled toner.

Check the temperature sensitive label on the developer beads. If the label has turned dark, the beads have been exposed to a higher than expected temperature and should not be used.

If the developer beads are being replaced for toner clumping, also replace the toner cartridge of the effected color. The dispense assembly of the effected color should also be purged of all toner before the new toner cartridge is installed.

Developer

MagneticRoller

Note Wire RoutingUnder Tab

S7700-179

Protective Paper

Release Tabs

Spill Caution

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Service Parts Disassembly 8-27

1. Place the developer housing assembly (new or used) to be recharged on a drop cloth.

CautionDuring this procedure, the developer housing assembly must be kept level at all times. To prevent toner spillage, it is recommended that the developer housing assembly be fully supported level by laying it on something like a large piece of cloth, paper towels or styrofoam hollowed out for the developer housing assembly to lie on. If new, remove the protective cover over the magnetic roller. Do not touch the magnetic roller.

NoteThe wires are routed under and behind the right snap tab.

2. Release the snap tabs at each end of the developer housing assembly and remove the assembly cover.

3. Agitate the package of developer mix and then cut it open. Carefully pour the entire contents of developer mix as evenly as possible over the two augers. Do not let the developer mix accumulate heavily on the roller. Keep the developer housing assembly level.

4. Reinstall the cover making sure that the rear tabs are all engaged in their respective slots while positioning the wire harness under the snap tab. Press firmly until you hear a positive “snap” sound for each tab indicating each snap tab is securely fastened.

5. Tear off the ATC sensor perforated tag. Do NOT remove the ATC sensor label from the developer housing.Peel off the protective backing, and adhere the label to the appropriate or corresponding Imaging Unit Plate. Make sure the ATC sensor tag label can be located if needed later.

6. Record the number for entering into NVRAM in the next step.

7. Perform the ATC Sensor Setup procedure, see page 6-14.

CautionIt is important to re-enter the ATC value when replacing a developer. Failing to do so could result in poor color balance and shortened developer life.

NoteThe ATC sensor tag is difficult to view once the developer has been installed. Remove the label prior to installation.

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8-28 Phaser 7750 Printer Service Manual

Toner Dispense Motor Assembly

1. Remove the right cover, see page 8-4.

2. Remove the top cover assembly, see page 8-5.

3. Remove the dispense housing assemblies, see page 8-20.

4. Remove the 2 screws that secure the toner dispense motor assembly to the printer frame.

5. Disconnect the wiring harness from each motor.

6. Remove the toner dispense motor assembly.

7750-019

Page 241: Phaser 7750 Service Manual

Service Parts Disassembly 8-29

Steering Drive Assembly

1. Remove the Imaging Units and Imaging Unit Plate Cover, see page 8-22.

2. Disconnect the wiring harness.

3. Remove the 3 screws securing the Steering Drive Assembly and remove the assembly from the printer.

Replacement Procedures

NoteYou may have to rotate the CAM gear to reinstall the steering drive assembly.

7750-127

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8-30 Phaser 7750 Printer Service Manual

Mark-On-Belt (MOB) Sensor

1. Remove the waste cartridge assembly.

2. Remove the imaging unit plate cover, see page 8-19.

3. Remove the waste toner agitator motor.

4. Remove the left-hand inner cover.

5. Remove the waste cartridge sensor holder, see page 8-18.

6. Disconnect the purple harnesses.

7. Remove the wiring harness from three clips.

8. Remove 1 black screw to remove the mark-on-belt assembly.

Replacement Procedures

NoteIf the mark-on-belt adjustment procedure (RegiCon) is being performed, then proceed to the following steps.

1. Using the laser window cleaning wand, move the MOB sensor back into the original position. Store the cleaning wand back in the front cover.

7750-013

Page 243: Phaser 7750 Service Manual

Service Parts Disassembly 8-31

Exit Transport Assembly

1. Remove the rear cover, see page 8-6.

2. Remove the left-hand top cover, see page 8-8.

3. Remove the fuser front cover.

4. Open left-hand cover.

5. Remove the 1 screw securing the transport assembly cover and remove the cover.

6. Disconnect the harnesses to the transport assembly and the left-hand cover interlock connector.

7. Remove the 3 remaining screws securing the transport assembly and remove the assembly.

7750-158

1

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8-32 Phaser 7750 Printer Service Manual

Fuser Fan Assembly

1. Remove the rear cover, see page 8-6.

2. Remove the top cover, see page 8-5.

3. Remove the right side cover.

4. Note the routing of the wiring harness.

NoteIt is easier to re-install the wire harness if the fuser fan and plastic mounting bracket are removed from the printer.

5. Remove the 2 screws securing the fuser fan assembly and remove the assembly.

6. Disconnect the wiring harness.

Locating Pin

7750-132

Page 245: Phaser 7750 Service Manual

Service Parts Disassembly 8-33

Accumulator Belt Mounting Frame

1. Remove the accumulator belt assembly.

2. Remove the imaging units and protect from light.

3. Remove the imaging unit plate cover.

4. Remove the steering drive assembly.

5. Remove the fuser.

6. Remove the registration assembly.

7. Remove the mounting screws from the main drive assembly and push it 1/4 inch to the rear of the printer.

8. Remove 4 black screws that mount the accumulator belt frame to the left hand lift jack.

9. Remove the e-clips and washers from the right hand lift jack roller guides.

10. Remove the 4 black screws holding the right hand lift bracket to the Accumulator Belt Frame and remove the bracket.

11. Remove the 1 screw holding the accumulator belt connector to the rear frame and move the harness out to the way.

12. Remove the 2 screws holding the first bias transfer contacts to the rear frame and move them out of the way.

13. Remove the guide studs on the front and rear of the printer.

14. Unhook the erase lamps mounted on each guide rail and remove the guide rails.

15. Raise the front handle.

16. Lift the accumulator belt frame assembly as high as it goes and remove it from the right side of the printer.

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8-34 Phaser 7750 Printer Service Manual

Belt Cleaner

1. Open the right-hand door.

2. Open the front cover and lower the main lever.

3. Lift the accumulator belt locking lever and pull the assembly out a few inches.

4. Using a 2.5 mm hex driver remove the 2 screws on the left side of the belt cleaner assembly.

5. Remove the belt cleaner assembly being careful not to spill toner.

Replacement Procedures

CautionNever run the printer without the belt cleaner installed or severe damage to the Accumulator Belt can occur.

Ensure that the accumulator belt is fully inserted or severe printer damage can result. NEVER FORCE THE MAIN LEVER!

7750-131

Page 247: Phaser 7750 Service Manual

Service Parts Disassembly 8-35

Waste Auger Assembly

1. Remove the right side cover, see page 8-4.

2. Remove the waste cartridge and lower the main lever.

3. Remove accumulator belt assembly, see page 8-34.

4. Return the main lever to its upright position.

5. Remove 2 screws securing the Waste Auger Assembly.

6. Shift the waste auger assembly to remove the drive shaft from the bearing and remove the waste auger assembly.

NoteBe careful not to knock the bearing out of its seat or to spill the waste toner during removal.

Replacement Procedures

NoteWhen reinstalling, be sure to return the main lever is down before reinstalling the accumulator belt assembly.

7750-236

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8-36 Phaser 7750 Printer Service Manual

Laser Unit (ROS)

1. Remove the rear cover, see page 8-6.

2. Remove the right side cover, see page 8-4.

3. Disconnect the wiring harnesses at engine board P400 and 401.

4. Undo the retainers and undo the wiring harness.

NoteObserve the routing of the laser unit wiring harness up to the engine control board, the information will be needed during reassembly.

5. Remove the 2 screws securing the laser unit in the printer.

CautionThe laser unit is heavy.

6. Pull the laser unit out of the printer.

LASER ADJUSTMENTS

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Service Parts Disassembly 8-37

Replacement Procedures

NoteYou must perform the RegiCon adjustment procedures after replacing the Laser Unit, see "RegiCon Adjustment Procedures" on page 6-5.

NoteStore the NVRAM values to the hard drive after calibration. See "Store Engine NVRAM" on page 6-21.

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8-38 Phaser 7750 Printer Service Manual

Image Processor Board

1. Turn the power OFF and unplug the printer.

CautionThe image processor board is susceptible to ESD damage. Observe proper ESD precautions.

2. Disconnect all communication cables.

3. Remove 4 screws securing the image processor board and remove the board.

4. The following should be transferred to a the new board if the image processor board is being replaced.

■ Internal Hard Drive.

■ NVRAM chip to preserve the customer’s network and setup values.

■ Memory

■ Configuration Chip

NoteMake sure the image processor board is fully seated when reinstalling.

7750-248

NVRam(socketed)

Page 251: Phaser 7750 Service Manual

Service Parts Disassembly 8-39

Internal Hard Drive

CautionThe internal hard drive is susceptible to ESD damage. Observe proper ESD precautions.

1. Remove the image processor board.

2. Using a T-10 torx bit, remove 4 screws from the bottom side of the image processor board holding the Internal Hard Drive.

3. Slide the internal hard drive away from the connector.

Replacement Procedures

CautionIt is possible to mis-align the pins when seating the new internal hard drive.

NoteIf you replace the internal hard drive, you must enter Service Diagnostics Mode and run the “Store NVRAM” test.

Fig. 1

Fig. 2

7750-235

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8-40 Phaser 7750 Printer Service Manual

Electrical Chassis (Card Cage) Assembly

NoteBefore removing the electrical chassis assembly, it is recommended you store the Engine NVRAM data to the hard drive. See "Store Engine NVRAM" on page 6-21.

1. Remove the right cover, see page 8-4.

2. Remove the top cover, see page 8-5.

3. Remove the rear cover, see page 8-6.

4. Remove all 3 shields on the rear of the printer.

5. Remove the image processor board, see page 8-38.

6. Disconnect the 9 wiring harnesses along the edges of the engine controller board. 7 of these harnesses are in front of the controller board. The other 2 are on the left side.

7. Two of the engine control connectors have connector locks. There is 1 harness clip to release.

8. Undo the harness retainer. Disconnect the wiring harness to the relay board connector P300 and the front panel cable to P564.

9. Remove the 2 mounting screws towards the rear of the printer, but only loosen the two mounting screws towards the printer front.

NoteThe 2 screws toward the printer front serve as a guide for reinstallation.

7750-027

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Service Parts Disassembly 8-41

10. Lift and tilt the cage assembly to release it from the engine control interface board connector below the cage assembly and remove the assembly.

Replacement Procedures

NoteBefore re-installing the assembly, widen the gap in each of the two white nylon retainers to ensure that they successfully engage the interface board bracket. Mis-alignment prevents a good connection to the interface board.

1. Tilt and insert the electrical chassis under the two loosened screws.

2. Carefully lower the assembly onto the engine control interface board connector.

3. Push lightly in the center of the assembly to ensure the assembly is fully seated. If board is reasonably stable, the board is properly placed.

4. Continue installation by reversing the removal procedures.

CautionEnsure that all connections are firmly seated, pay special attention to the laser unit connections on the printers right side and to the Interface Board.

NoteAfter replacement of the engine control interface board, perform the "Diagnostic Engine NVRAM Reset" on page 6-20.

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8-42 Phaser 7750 Printer Service Manual

Engine Control Board

1. Store the engine board NVRAM values to the hard drive. See "Store Engine NVRAM" on page 6-21.

2. Remove the electrical (card cage) assembly, see page 8-40.

3. Disconnect the orange ribbon cable at the engine board.

4. Remove the 8 screws securing the engine control board metal shield and remove the shield.

5. Remove the remaining 6 screws and remove the engine control board.

Replacement Procedures

CautionWhen reinstalling the engine control board, be sure to fully seat connector P460.

1. Write the stored NVRAM values to the engine board using the Service Diagnostics procedure "Diagnostic Engine NVRAM Reset" on page 6-20.

Engine Control Board

7750-250

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Service Parts Disassembly 8-43

Engine Control Interface Board

CautionTwo connectors have locks to release before pulling on the harnesses.

Method #1

1. After removing the engine control board, see page 8-42.

2. Disconnect the 8 wiring harnesses.

3. Loosen the 2 mounting bracket screws and remove the interface board from the white plastic mounting posts.

Method #2

1. Lower the HVPS assembly to a horizontal position.

2. Disconnect the 8 wiring harnesses.

3. Remove the 2 screws that secure the engine control interface board mounting bracket to the printer frame.

4. Remove the engine control interface board and mounting bracket from the printer frame.

7750-023

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8-44 Phaser 7750 Printer Service Manual

3.3 VDC and 5 VDC Low-Voltage Power Supplies

NoteIf removing only one of the low-voltage power supplies, disconnect the associated wiring harness from the printer, and remove the 4 screws that secure the low-voltage power supply to the mounting bracket.

1. Move the T1 and T3 power supplies out of the way.

2. Disconnect P/Js 510, 511, 15 and 16 from the low-voltage power supplies.

3. Loosen the 4 screws securing the mounting bracket to the frame.

4. Lift power supply up and out to remove.

7750-010

5 V LVPS

3.3 V LVPS

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Service Parts Disassembly 8-45

LD Power Relay

1. Remove the rear cover and shield.

2. Disconnect the wiring harness.

3. Remove 2 screws securing the LD power assembly.

4. Remove the LD power assembly.

Fig. 2

Fig. 1

7750-232

Page 258: Phaser 7750 Service Manual

8-46 Phaser 7750 Printer Service Manual

24 VDC Low-Voltage Power Supply, Fan and Bracket

1. Remove the rear cover and 24 VDC shield.

2. Remove the top rear cover and left-hand rear mid covers, see page 8-7.

NoteIf only the power supply needs to be removed, disconnect the wiring harness and loosen the 2 screws that secure the power supply to the PS mounting bracket.

3. Disconnect the wiring harness at P502, P505, and P2 from the 24 VDC power supply and the fan motor wiring harness P214.

4. Remove the 1 screw at the top of the bracket and loosen the remaining four screws in slots.

5. Remove the power supply and bracket assembly.

7750-024

Page 259: Phaser 7750 Service Manual

Service Parts Disassembly 8-47

T2 High-Voltage Power Supply

1. Remove the 24 VDC Power Supply and Bracket, see page 8-46.

2. Disconnect the high-voltage wires from the KCMY connectors.

3. Disconnect the wiring harness from J575 and J576.

4. Remove the 2 screws that secure the T2 power supply to the printer frame.

5. Remove the T2 high-voltage power supply.

K

C

M

Y

7750-025

Page 260: Phaser 7750 Service Manual

8-48 Phaser 7750 Printer Service Manual

Chassis AC Power Assembly

NoteAC power (consists of the AC drive, noise filter and GFI assemblies and mounting bracket.

1. Remove the T2 high-voltage power supply.

2. Remove T1 and T3 power supply assembly.

3. Disconnect the wiring harnesses P15 and P16, the AC drive wiring harness P43 and the individual wires at J39- J40, J41 and J47 of the AC drive board.

4. Disconnect the AC wires from P15 and P16 on the Noise Filter board.

5. Clear the wiring harnesses from their retaining clips.

6. Remove the seven screws securing the chassis assembly to the printer frame.

7. Remove the complete assembly from the printer frame.

7750-237

Page 261: Phaser 7750 Service Manual

Service Parts Disassembly 8-49

Main Drive Assembly

1. Remove the fuser.

2. Remove Tray 1 /(MPT), see page 8-9.

3. Remove the T2 high-voltage power supply, see page 8-47.

4. Disconnect the wiring harness.

CautionThere are 5 brass screws that hold the main drive assembly together. DO NOT REMOVE these screws.

5. Remove the 5 black screws that secure the complete main drive assembly to the printer frame.

6. Lift the complete main drive assembly up and out of the printer.

Replacement Procedures

NoteWhen reinstalling, rotate the main drive to ensure the gears move freely. Remove the Fuser unit to give better visibility.

1. As the main drive assembly is being installed into position, make sure the gears are meshed completely with the mating gears by slightly rotating the main motor until the main motor bracket seats without stress, and is flat against the frame.

2. Rotate the main drive after installing the assembly to ensure it rotates freely, and ensure it is FLAT against the frame.

CautionIt is easy to pinch or short wires under the main drive assembly bracket.

3. Make sure that the red transfer roller wire is connected near the right side of the main drive assembly to its mating connector on the frame.

7750-121

Do NOT removethese 5 screws

Page 262: Phaser 7750 Service Manual

8-50 Phaser 7750 Printer Service Manual

Accumulator Belt Drive Assembly

1. Remove the rear cover and shield.

2. Move the T1 and T3 power supplies out of the way.

3. Remove any components covering the motor which is mounted to the frame at the rear, top, left corner.

4. Remove the 3 screws that secures the motor and bracket assembly to the frame and remove the assembly.

7750-123

Page 263: Phaser 7750 Service Manual

Service Parts Disassembly 8-51

Developer Drive Assembly

1. Remove the 3.3 VDC and 5 VDC power supply and bracket assembly, see page 8-44.

2. Disconnect the wiring harness from the developer drive assembly.

3. Clear the high-voltage lines.

4. Remove the 2 black screws securing the developer drive assembly to the printer frame and remove from the printer.

Replacement Procedures

CautionWhen reinstalling, ensure that the assembly seats against the frame and rotate the main drive to ensure the gears move freely.

7750-124

Page 264: Phaser 7750 Service Manual

8-52 Phaser 7750 Printer Service Manual

Imaging Unit Drive Assembly

1. Remove the rear cover, see page 8-6.

2. Remove the right side cover, see page 8-4.

3. Remove the 3.3 VDC and 5 VDC Low-voltage power supply, see page 8-44.

4. Remove the 24 VDC Low-voltage power supply, see page 8-46.

5. Remove the T2 High-Voltage power supply, see page 8-47.

6. Remove the engine control interface board and bracket, see page 8-43.

7. Disconnect the wiring harnesses (1 to YMC and 1 to K) to the Print Engine Drive Assembly.

8. Remove the 2 screws securing the finisher connector (now accessible after removing the right cover assembly) and let it hang loose.

9. Remove 1 screw that is accessible through the frame access hole near the finisher connector.

10. Remove the remaining 7 screws that secure the imaging unit drive assembly to the printer frame.

11. Lift the imaging unit drive assembly up and out of the printer.

NoteSome wires will have to be removed from their clamps to clear the drive assembly.

7750-122

Page 265: Phaser 7750 Service Manual

Service Parts Disassembly 8-53

Tray 2 Paper-Select Switches

1. Remove the T1 and T3 high-voltage power supply.

2. Remove the 3.3 VDC and 5 VDC low-voltage power supplies, see page 8-44.

3. Disconnect the wiring harness from the Tray 1 paper-select switches.

4. Remove the 2 screws that secure the mounting bracket to the printer frame and remove the switch.

7750-240

Page 266: Phaser 7750 Service Manual

8-54 Phaser 7750 Printer Service Manual

Main Lever Assembly

Reinstallation Procedures

NoteSlide the main lever gears under the lift jack assembly racks and lift into position. Verify that the timing marks on the main lever and the lift jack assemblies align. The main lever assembly requires extra pressure approximately 1” from the front of the printer when properly aligned.

7750-249

Page 267: Phaser 7750 Service Manual

Service Parts Disassembly 8-55

Right-Hand Lift Jack Assembly

1. Ensure that the lift frame assembly is fully lifted and the main lever is in the down position.

2. Remove the accumulator belt assembly.

3. Remove RH cover assembly.

4. Remove the pivot pin and partially remove the main lever on the right hand side.

5. Remove the e-clips and washers from the RH lift jack assembly roller guides.

6. Remove the 4 screws that hold the RH lift jack bracket and remove the bracket.

7. Remove the 2 screws holding the waste auger assembly.

8. Remove the 4 screws holding the RH lift jack assembly and remove from the printer.

Reinstallation Procedures

NoteWhen reinstalling the RH lift jack assembly install the screws as follows: 1.Upper left. 2, Upper right. 3. Then the lower screws. Verify that the timing marks on the main lever and the lift jack assembly align.

Left-Hand Lift Jack Assembly

1. Ensure that the lift frame assembly is fully lifted and the main lever is in the down position.

2. Partially remove the main drive assembly.

3. Remove the accumulator belt assembly.

4. Remove the imaging units and protect from the light.

5. Remove the LH cover assembly.

6. Remove the transport registration assembly.

7. Remove the mark-on-belt (MOB) sensor assembly.

8. Reach inside the LH cover cavity and remove the black imaging unit rail, see "Imaging Unit Rail Assembly" on page 8-24.

CautionCover the black developer with multiple sheets of stiff paper or cardboard to prevent damage to the developer roller and to catch e-clips and washers loosened in the next step.

The washers can fall out into the lower metal cavity. Lay something underneath to catch the washers and screws.

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8-56 Phaser 7750 Printer Service Manual

9. Remove the e-clips, washers, and bearings from the LH lift jack assembly roller guides.

10. Partially remove the left hand side of the main lever assembly.

11. Remove the LH lever hinge.

12. Remove the 4 screws that hold the LH lift jack bracket and remove the bracket.

13. Remove the 4 screws holding the LH lift jack assembly and remove from the printer.

NoteWhen reinstalling the LH lift jack assembly install the screws as follows: upper left, upper right, then the lower screws. Verify that the timing marks on the main lever and the lift jack assembly align.

Page 269: Phaser 7750 Service Manual

Service Parts Disassembly 8-57

Optional Lower Trays

Right Side Door

1. Remove the 4 screws securing the right-hand cover and remove.

Rear Cover

1. Remove the 4 screws securing the cover.

2. Remove the rear cover.

7750-238

Page 270: Phaser 7750 Service Manual

8-58 Phaser 7750 Printer Service Manual

LTD/HCF Cover Assembly

1. Open Door C.

2. Remove 1 screw from each of the support straps.

3. Remove 1 screw from the cover’s front pivot bracket.

4. Remove the cover assembly from the rear pivot.

7750-164

Rear CoverInterlockSwitch

Front PivotBracket

Page 271: Phaser 7750 Service Manual

Service Parts Disassembly 8-59

High-Capacity Feeder (HCF) Tray 4

1. On the left side of the High-Capacity Feeder, remove one screw from the Tray 4 stopper bracket and remove the bracket.

2. Pull Tray 4 out of the printer.

High-Capacity Feeder (HCF) Tray 5 and Paper Transport

1. Open Tray 5.

2. Remove the 2 screws that secure the Tray 5 stopper.

3. Remove the 2 screws securing the paper transport, and slide it back in.

4. Pull Tray 5 out of the printer.

7750-028

TRAY 4 STOPPERBRACKET

PAPER TRANSPORT

TRAY 5 STOPPER

7750-029

Page 272: Phaser 7750 Service Manual

8-60 Phaser 7750 Printer Service Manual

LTD/HCF Feeder Paper-Select Switches

1. Remove the paper tray.

2. Reach inside the cabinet and disconnect the wire harness.

3. Reach inside the cabinet and remove the 1 screw that secures the paper-select switch.

Universal Tray Assembly

V

Universal Tray PaperSelect Switch (3X)

7750-154

Page 273: Phaser 7750 Service Manual

Service Parts Disassembly 8-61

LTD/HCF Feeder Paper Feed Motor Assembly

1. Remove the left-hand cover.

2. Open the tray halfway.

3. Disconnect the wiring harness.

4. Remove the 2 screws holding the Tray 2 feeder assembly, not the screws securing the lower tray bracket.

5. Remove the tray feeder assembly.

6. Some manipulation may be required to disengage the gears.

Removal of Motor

1. Disconnect the wiring harness from the motor.

2. Remove the 2 screws securing the motor to the feeder bracket.

3. Lift the motor straight out of the bracket to clear the gear on the motor shaft.

4. When reinstalling the motor, it may be necessary to manually rotate the gears to mesh them with the other gears.

7750-163

Chute to Lower

Paper FeedMotor AssemblyTrays 3 & 4- HCFTrays 3, 4, & 5 - LTD

LEFT SIDE

Page 274: Phaser 7750 Service Manual

8-62 Phaser 7750 Printer Service Manual

Bracket Assembly, Left-Hand and Right-Hand Gear (HCF)

1. Remove the rear cover.

2. Remove the 2 screws securing the bracket assembly (Gear RH (2) or Gear LH (1)) to the frame.

3. Remove the bracket assembly.

Replacement Procedures

NoteThere are locating pins for each bracket.

7750-221

1

2 V

V

V

Page 275: Phaser 7750 Service Manual

9Chapter

Service Parts Lists

In this chapter...■ Serial Number Format

■ Using the Parts List

■ Hardware Kits

■ Recommended Service Tools

Page 276: Phaser 7750 Service Manual

9-2 Phaser 7750 Printer Service Manual

Serial Number Format

Changes to Xerox products are made to accommodate improved components as they become available. It is important when ordering parts to include the following information:

■ Component’s part number

■ Product type or model number

■ Serial number of the printer

Serial numbering. Particular fields in the serial number indicate the modification level of the printer, the date of its manufacture and the sequence number of the printer produced on that day.

The serial number is coded as follows:

■ The text “S/N” followed by the serial number in the barcode.

■ The barcode does not include a field identifier.

■ The nine digit serial number is based on the following format:PPPRSSSSS

R - Single digit numeric revision digit. To be rolled when a major product change occurs. Initiated with a change request.

SSSSS - Five digit numeric serial number.

Serial Number Example:

RRW453072:

RRW = Product code for the 110V Printer

4 = Revision level

53072 = Serial number

PPP = Three digit alphanumeric product code

Product Model Voltage Product Code

7750 B, DN, GX, DXF 110V RRW

7750V B, DN, GX, DXF 220V RTG

Page 277: Phaser 7750 Service Manual

Service Parts Lists 9-3

Using the Parts List

1. No.: The callout number from the exploded part diagram.

2. Part Number: The material part number used to order specific parts.

3. Qty: This number represents the parts per printer, not the number of parts supplied in the actual part order.

4. Name/Description: Details the name of the part to be ordered and the number of parts supplied per order.

5. Parts identified throughout this manual are referenced PL#.#.#; For example, PL3.1.10 means the part is item 10 of Parts List 3.1.

6. A black triangle preceding a number followed by a parenthetical statement in an illustrated parts list means the item is a parent assembly, made up of the individual parts called out in parentheses.

7. The notation “with X~Y” following a part name indicates an assembly that is made up of components X through Y. For example, “1 (with 2~4)” means part 1 consists of part 2, part 3, and part 4.

8. An asterisk (*) following a part name indicates the page contains a note about this part.

9. The notation (NS) next to a part indicates that particular part is not spared, but contained in a kit or major assembly.

10. The notation “J1<>J2 and P2” is attached to a wire harness. It indicates that connector Jack 1 is attached to one end of the wire harness and connector J2 is attached to the other end that is plugged into P2.

NoteOnly parts showing part numbers are available for support. Parts not showing part numbers are available on the parent assembly.

Legend:

Identifier Meaning

C C-ring

E E-ring

KL K-clip

S Screw

p/o Part of...

N/S Not Spared

Page 278: Phaser 7750 Service Manual

9-4 Phaser 7750 Printer Service Manual

Parts List 1.1 Drive Unit

s4500-345

Page 279: Phaser 7750 Service Manual

Service Parts Lists 9-5

Drive Unit PL 1.1

No. Part number Qty Part Description and (part name)

1 116-1752-00 Drum Drive Assembly (DRIVE ASSY DRUM)

4 116-1753-00 Accumulator Belt Drive (DRIVE ASSY IBT)

7 116-1754-00 Developer Drive Assembly (DRIVE ASSY-DEVE)

14 116-1755-00 Main Drive Assembly (DRIVE ASSY-MAIN)

15 116-1756-00 Developer Gear Assembly (GEAR ASSY-DEVE)

Page 280: Phaser 7750 Service Manual

9-6 Phaser 7750 Printer Service Manual

Part List 1.2 Main Drive Motor Assembly

Main Drive Motor Assembly PL 1.2

No. Part number Qty Part Description and (part name)

13 116-1539-00 Developer Clutch Assembly (CLUTCH ASSY DEVE)

s7750-346

Page 281: Phaser 7750 Service Manual

Service Parts Lists 9-7

Part List 1.3 Steering Motor and MOB

Steering Motor and Mark-On-Belt PL 1.3

No Part number Qty Part Description and (part name)

1 116-1104-00 Belt Steering Drive Assembly (DRIVE ASSY STEERING)

4 116-1124-00 Mark On Belt Sensor Assembly (SENSOR ASSY-MOB)

s7750-347

Page 282: Phaser 7750 Service Manual

9-8 Phaser 7750 Printer Service Manual

Part List 2.1 Tray 2

Tray 2 PL 2.1

No Part number Qty Part Description and (part name)

1 116-1093-00 Tray Stopper (STOPPER TRAY)

2 Spacer N/S

3 116-1126-00 Paper Supply Switch Assembly (SWITCH ASSY-P.S)

4 119-6504-00 Tray 2 (Universal Tray)

s7750-348

Page 283: Phaser 7750 Service Manual

Service Parts Lists 9-9

Part List 2.3 Tray Feeder and Left Lower Cover Assy

Tray 2 Feeder and Left Lower Cover Assembly PL 2.3

No Part number Qty Part Description and (part name)

1 116-1160-00 Tray 2 Feeder Assembly (FEEDER ASSY)

2 116-1181-00 Lower LH Cover Assembly (COVER ASSY LH LOW)

16 116-1757-00 Lower Chute

s7750-350

Page 284: Phaser 7750 Service Manual

9-10 Phaser 7750 Printer Service Manual

Part List 2.4 Tray 2 Feeder

Tray 2 Feeder PL 2.4

No Part number Qty Part Description and (part name)

1 116-1109-00 Motor Assembly (MOTOR ASSY)

16 116-1211-00 Roller Kit

s7750-35116

Page 285: Phaser 7750 Service Manual

Service Parts Lists 9-11

Part List 2.6 Registration Transport

Registration Transport PL 2.6

No Part number Qty Part Description and (part name)

1 116-1758-00 Registration Transport Assembly (TRNSPORT ASSY-REGI)

s7750-353

Page 286: Phaser 7750 Service Manual

9-12 Phaser 7750 Printer Service Manual

Part List 2.7 Left Cover Unit

Left Cover Unit PL 2.7

No Part number Qty Part Description and (part name)

1 116-1540-00 11/23T Tooth Damper Gear (GEAR DAMPER 11T/23T)

3 116-1541-00 Left Hand Damper Gear (White) (DAMPER-LH)

5 116-1182-00 Left Hand Cover Assembly (COVER ASSY-L/H OPB)

s7750-354

Page 287: Phaser 7750 Service Manual

Service Parts Lists 9-13

Part List 2.8 Left Cover Assembly: 1 of 2

Left Cover Assembly: 1 of 2 PL 2.8

No Part number Qty Part Description and (part name)

3 108R00579 2nd BTR/Transfer Roller Assembly (2NDBTR ASSEMBLY)

12 116-1543-00 Exit Switch Assembly (SWITCH ASSY-EXIT

14 116-1098-00 Duplex Chute Assembly (CHUTE ASSY-DUP)

16 116-1182-00 Left Cover Assembly

17 116-1759-00 Exit Roller Assembly

s7750-355

Page 288: Phaser 7750 Service Manual

9-14 Phaser 7750 Printer Service Manual

Part List 2.9 Left Cover Assembly: 2of 2

Left Cover Assembly: 2 of 2 PL 2.9

No Part number Qty Part Description and (part name)

3 116-1760-00 Second Motor Assembly (MOTOR ASSY-2ND)

6 116-1544-00 Paper on Belt (POB) Sensor

17 114-1542-00 Damper Gear (45Tooth) (GEAR ASSY-DAMPER 45T)

s7750-356

Page 289: Phaser 7750 Service Manual

Service Parts Lists 9-15

Part List 2.10 Exit Transport Assembly

Exit Transport Assembly PL 2.10

No Part number Qty Part Description and (part name)

1 116-1762-00 Exit Transport

2 116-1196-00 Exit Transport Cover

s7750-357

Page 290: Phaser 7750 Service Manual

9-16 Phaser 7750 Printer Service Manual

Part List 2.12 Tray 1: 1 of 2

Tray 1: 1 of 2 PL 2.12

No Part number Qty Part Description and (part name)

1 116-1763-00 Tray 1/MPT (FEEDER ASSY-MSI)

s7750-359

Page 291: Phaser 7750 Service Manual

Service Parts Lists 9-17

Part List 2.13 Tray 1: 2 of 2

Tray 1 PL 2.13

No Part number Qty Part Description and (part name)

5 116-1763-00 Tray 1/MPT Extension

s7750-360

Page 292: Phaser 7750 Service Manual

9-18 Phaser 7750 Printer Service Manual

Part List 2.14 Tray 1 Feed Assembly

Tray 1 Feed Assembly PL 2.14

No Part number Qty Part Description and (part name)

14 116-1765-00 Feed Roller Assembly (ROLLER ASSY-FEED)

15 116-1820-00 2 Feed Roller Kit

19 116-1166-00 Retard Pad (PAD ASSY-RETARD)

22 116-1766-00 Spring Middle

24 116-1767-00 Spring Front and Rear

s7750-361

Page 293: Phaser 7750 Service Manual

Service Parts Lists 9-19

Part List 3.1 Laser (ROS) Assembly

Laser ROS Assembly PL 3.1

No Part number Qty Part Description and (part name)

2 116-1768-00 Laser Assembly (ROS ASSEMBLY)

s7750-36

Page 294: Phaser 7750 Service Manual

9-20 Phaser 7750 Printer Service Manual

Part List 4.1 Xerographic Module: 1 of 2

Xerographic Module 1 of 2 PL 4.1

No Part number Qty Part Description and (part name)

2 108-R005-75 Waste Toner Cartridge

3 116-1138-00 Sensor Holder Assembly (HOLDER ASSY-SNS)

7 108-R005-81 Imaging Unit

8 116-1101-00 Agitator Motor Assembly (MOTOR ASSY-AGT)

s7750-364

Page 295: Phaser 7750 Service Manual

Service Parts Lists 9-21

Part List 4.2 Xerographic Module: 2 of 2

Xerographic Module 2 of 2 PL 4.2

No Part number Qty Part Description and (part name)

1 116-1769-00 Xerographic Plate Assembly (PLATE ASSY-XERO OPB)

6 116-1770-00 Image Unit Mounting Rail Y, M, C (ERASE ASST YMC)

7 116-1771-00 Image Unit Mounting Rail K (ERASE ASST)

s7750-365

Page 296: Phaser 7750 Service Manual

9-22 Phaser 7750 Printer Service Manual

Part List 5.1 Lift Unit

s7750-366

Page 297: Phaser 7750 Service Manual

Service Parts Lists 9-23

Lift Unit PL 5.1

No Part number Qty Part Description and (part name)

1 116-1198-00 LH Frame Lift Assembly (FRAME ASSY-LIFT LH)

2 116-1199-00 RH Frame Lift Assembly (FRAME ASSY-LIFT RH)

3 116-1772-00 Bearing

4 116-1773-00 Washer

5 Plate N/S

6 116-1202-00 Lift Arm Latch Assembly (LATCH ASSY-AST)

7 116-1200-00 LH Handle Hinge (HINGE-HANDLE LH)

8 116-1201-00 RH Handle Hinge (HINGE HANDLE RH)

9 116-1203-00 Pivot Pin (SHAFT MAIN)

10 116-1204-00 Main Lift Handle Assembly (LEVER ASSY-MAIN)

Page 298: Phaser 7750 Service Manual

9-24 Phaser 7750 Printer Service Manual

Part List 5.2 Accumulator Belt Assembly

Accumulator Belt Assembly PL 5.2

No Part number Qty Part Description and (part name)

1 116-1774-00 Accumulator Belt Assembly (KIT IBT-UNIT OPB)

7 116-1180-00 Waste Toner Auger Assembly (AUGER ASSY)

10 108-R005-80 Accumulator Belt Cleaner Assembly

s7750-367

Page 299: Phaser 7750 Service Manual

Service Parts Lists 9-25

Part List 5.6 Accumulator Belt Elevator

Accumulator Belt Elevator PL 5.6

No Part number Qty Part Description and (part name)

4 116-1777-00 Accumulator Belt Elevator (IBT ELEVATOR FRAME) includes items 1 - 4

s7750-371

Page 300: Phaser 7750 Service Manual

9-26 Phaser 7750 Printer Service Manual

Part List 6.1 Developer Unit: 1 of 2

s7750-372

Page 301: Phaser 7750 Service Manual

Service Parts Lists 9-27

Developer Unit: 1 of 2 PL 6.1

No Part number Qty Part Description and (part name)

1 116-1778-00 Yellow Toner Dispenser (DISP ASSY Y)

2 106-R006-51 Yellow Toner Cartridge

3 116-1779-00 Magenta Toner Dispenser (DISP ASSY M)

4 106-R006-50 Magenta Toner Cartridge

5 116-1780-00 Cyan Toner Dispenser (DISP ASSY C)

6 106-R006-49 Cyan Toner Cartridge

7 116-1781-00 Black Toner Dispenser (DISP ASSY K)

8 106-R006-48 Black Toner Cartridge

9 116-1782-00 Toner Dispenser Base Assembly (BASE ASSY DISP)

Page 302: Phaser 7750 Service Manual

9-28 Phaser 7750 Printer Service Manual

Part List 6.2 Developer Unit: 2 of 2

Developer Unit: 2 of 2 PL 6.2

No Part number Qty Part Description and (part name)

1 116-1783-00 Developer Housing (HSG ASSY DEVE)

5 116-1784-00 Black Developer Beads (Developer K)

6 116-1785-00 Yellow Developer Beads (Developer Y)

7 116-1786-00 Magenta Developer Beads (Developer M)

8 116-1787-00 Cyan Developer Beads (Developer C)

s7750-373

Page 303: Phaser 7750 Service Manual

Service Parts Lists 9-29

Part List 7.1 Fuser Assembly

Fuser Assembly PL 7.1

No Part number Qty Part Description and (part name)

1 115-R000-25115-R000-26

Fuser Assembly (110V)Fuser Assembly (220V)

s7750-374

Page 304: Phaser 7750 Service Manual

9-30 Phaser 7750 Printer Service Manual

Part List 8.1 Air System

Air System PL 8.1

No Part number Qty Part Description and (part name)

1 116-1788-00 Laser Shutter Motor

4 116-1789-00 LH Lower Inner Cover (COVER-INNER, L/H, LOW)

6 116-1176-00 Fuser Fan Assembly (FAN ASSY FUSER)

8 116-1790-00 Laser Fan (FAN ASSY (ROS))

9 116-1831-00 Developer Cooling Fan (Not Shown)Location: Inside Rear Cover

10 116-1833-00 Bottom Fan (Not Shown)Location: Underneath Power Supplies

s7750-376

Page 305: Phaser 7750 Service Manual

Service Parts Lists 9-31

11 116-1834-00 Bottom Fan Duct (Not Shown)Location: Underneath Power Supplies

Air System PL 8.1

No Part number Qty Part Description and (part name)

Page 306: Phaser 7750 Service Manual

9-32 Phaser 7750 Printer Service Manual

Part List 9.1 Electrical Components: 1 of 3

s7750-377

Page 307: Phaser 7750 Service Manual

Service Parts Lists 9-33

Electrical Components: 1 of 3 PL 9.1

No Part number Qty Part Description and (part name)

1 116-1791-00 HVPS (T1)

2 116-1792-00 HVPS (T3)

4 116-1793-00116-1150-00

3.3 LVPS (110V)3.3 LVPS (220V)

5 116-1151-00116-1152-00

5V LVPS (110V)5V LVPS (220V)

6 116-1829-00 Interface Engine Control Board

9 116-1153-00116-1154-00

24V LVPS (110V)24V LVPS (220V)

11 116-1175-00 LVPS Fan

14 116-1794-00 HVPS (T2)

Page 308: Phaser 7750 Service Manual

9-34 Phaser 7750 Printer Service Manual

Part List 9.2 Electrical Components: 2 of 3

Electrical Components: 2 of 3 PL 9.2

No Part number Qty Part Description and (part name)

1 116-1796-00116-1797-00

AC Power Chassis Assembly (110V)AC Power Chassis Assembly (220V)

13 116-1801-00 Outlet Panel

14 116-1798-00 Power Cord

s7750-378

Page 309: Phaser 7750 Service Manual

Service Parts Lists 9-35

Part List 9.3 Electrical Components: 3 of 3

Electrical Components: 3 of 3 PL 9.3

No Part number Qty Part Description and (part name)

1 116-1223-00 Developer Block

2 116-1312-00 Wire Harness

3 116-1307-00 Wire Harness Y, M

4 116-1308-00 Wire Harness C, K

5 116-1913-00 2nd Wire Harness

6 116-1306-00 DTS Connector

7 116-1310-00 DTS Wire Harness

8 116-1799-00 DC Wire Harness

s7750-379

Page 310: Phaser 7750 Service Manual

9-36 Phaser 7750 Printer Service Manual

Part List 10.1 Front Cover

Front Cover PL 10.1

No Part number Qty Part Description and (part name)

3 116-1800-00 Front Cover Assembly (COVER ASSY FRONT MN)

6 116-1187-00 Strap

7 116-1116-00 ROS Window Cleaning Wand (CLEANER ASSY)

9 116-1117-00 ROS Window Cleaning Wand Base (CLEANER ASSY BASE)

12 116-1095-00 Right Hand Cover (COVER ASSY RIGHT MN)

s7750-380

Page 311: Phaser 7750 Service Manual

Service Parts Lists 9-37

Part List 10.2 Top Cover and Front Panel

Top Cover and Front Panel PL 10.2

No Part number Qty Part Description and (part name)

1 116-1802-00 Top Cover Assembly (TOP COVER)

5 116-1803-00 Front Panel (CONTROL PANEL)

7 116-1805-00 Front Fuser Cover (COVER AY-F FRONT MN)

9 116-1806-00 Link Assembly (LINK ASSEMBLY)

10 116-1807-00 On/Off Switch (MAIN POWER SWITCH

11 116-1804-00 Front Panel Wire Harness

s7750-381

Page 312: Phaser 7750 Service Manual

9-38 Phaser 7750 Printer Service Manual

Part List 10.3 Rear Cover

Rear Cover PL 10.3

No Part number Qty Part Description and (part name)

1 Data plate N/S

2 Blind Cover

3 116-1954-00 Rear Cover Assembly (COVER ASSY REAR)

4 Rear Cover {p/o item 3}

5 116-1188-00 Lower Tray Unit Harness Cover (COVER BLIND TM)

6 116-1189-00 Left Hand Rear Middle Cover (COVER-L/H R,MID)

7 116-1191-00 Left Hand Rear Lower Cover (COVER-L/H R,LOW)

8 116-1914-00 Left Hand Front Lower Cover (COVER AY-L/H F, LOW MN)

9 116-1808-00 Top Rear Cover (COVER-TOP, REAR)

s7750-382

Page 313: Phaser 7750 Service Manual

Service Parts Lists 9-39

Part List 11.1 Inverter Transport

Inverter Transport PL 11.1

No Part number Qty Part Description and (part name)

1 116-1809-00 Inverter Transport Assembly (TRANSPORT ASSY-INV)

s7750-383

Page 314: Phaser 7750 Service Manual

9-40 Phaser 7750 Printer Service Manual

Part List 12.1 Duplex Unit Assembly

Duplex Unit Assembly PL 12.1

No Part number Qty Part Description and (part name)

2 116-1810-00 Duplex Transport Assembly (TRANSPORT ASSY DUP)

s7750-385

Page 315: Phaser 7750 Service Manual

Service Parts Lists 9-41

Part List 13.1 Image Processor and Engine Control Boards

Boards PL 13.1

No Part number Qty Part Description and (part name)

1 116-1812-00 Chassis Assembly (w/o Engine Board)

2 116-1811-00 Engine Control Board (PWB MCU)

3 650-4306-00671-5316-80

Image Processor Board

4 156-4837-00156-4663-00156-4857-00

128 MB RAM SODIMM256 MB RAM SODIMM512 MB RAM SODIMM

5 650-4311-00 Internal Hard Drive

6 116-1836-00 Not Shown - Electrical Chassis Cooling Fan

7 163-1506-00163-1507-00

Cofiguration Chip BaseConfiguration Chip Network

7750-470

2

1

3

54

Page 316: Phaser 7750 Service Manual

9-42 Phaser 7750 Printer Service Manual

Part List 16.1 Lower Trays 3/4/5 Assembly

Lower Trays 3/4/5 Assembly PL 16.1

No Part number Qty Part Description and (part name)

2 119-6504-00 Tray 3

7 116-1090-00 Tray 4

8 116-1089-00 Tray 5

9 116-1126-00 Tray 3 Paper Size Switch

10 116-1127-00 Tray 4/5 Paper Size Switch

s7750-388

Page 317: Phaser 7750 Service Manual

Service Parts Lists 9-43

Part List 16.5 Lower Trays Paper Feeder: 1 of 2

Lower Trays Paper Feeder: 1 of 2 PL 16.5

No Part number Qty Part Description and (part name)

4 116-1838-00 Tray 5 Transport Assembly

16 116-1816-00 Tray 5 Feeder

19 116-1218-00 Tray 5 Feed out Sensor

20 116-1169-00 Upper Chute

21 116-1168-00 Lower Chute

s7750-392

Page 318: Phaser 7750 Service Manual

9-44 Phaser 7750 Printer Service Manual

Part List 16.6 Lower Trays Paper Feeder: 2 of 2

Lower Trays Paper Feeder: 2 of 2 PL 16.6

No Part number Qty Part Description and (part name)

1 116-1815-00 Takeaway Roller

8 116-1173-00 Chute Assembly

12 Chute

13 116-1167-00 Lower Chute

s7750-393

Page 319: Phaser 7750 Service Manual

Service Parts Lists 9-45

Part List 16.13 Left Cover Assembly (LTD)

Left Cover Assembly (LTA) PL 16.13

No Part number Qty Part Description and (part name)

1 116-1185-00 Left Cover Assembly

s7750-400

Page 320: Phaser 7750 Service Manual

9-46 Phaser 7750 Printer Service Manual

Part List 16.14 Tray 4/5 Lift Gear Assembly

Left Cover Assembly (LTA) PL 16.14

No Part number Qty Part Description and (part name)

2 116-1171-00 Gear Assembly Tray 4

3 116-1170-00 Gear Assembly Tray 5

s7750-401

Page 321: Phaser 7750 Service Manual

Service Parts Lists 9-47

Part List 16.15 Electrical Components and Caster

Electrical Components LTA PL 16.15

No Part number Qty Part Description and (part name)

4 116-1099-00 Takeaway Motor 2

5 116-1814-00 Takeaway Motor 1

12 116-1818-00 Tray Module Control Board

s7750-402

Page 322: Phaser 7750 Service Manual

9-48 Phaser 7750 Printer Service Manual

Part List 16.16 Lower Tray Deck

Lower Tray Deck PL 16.16

No Part number Qty Part Description and (part name)

1 116-1814-00 Tray 3 Module Motor Assembly (MOTOR ASSY-3TM

2 116-1813-00 LTD Circuit (control) Board (TRAY MODULE PWB)

3 116-1206-00 Caster, Locking (CASTER ASSY-S)

4 116-1221-00 Caster (CASTER ASSY)

5 Paper Select Switch

6 116-1184-00 LTD Module Cover (COVER ASSY LH 3TM)NOT SHOWN

1

4

34

3

7750-472

2

Page 323: Phaser 7750 Service Manual

Service Parts Lists 9-49

Hardware Kits

Recommended Service Tools

The following service are recommended as a start for servicing the printer. As additional tools are needed visit the following URL for help: http://cpid.office.xerox.com/hardwaretools.html.

Parts Part number Qty Name and description (vendor description)

116-1912-00 Sensor Kit

116-1210-00 Sensor Flag Kit

116-1211-00 Roller Kit

116-1820-00 Tray 1/MPT Roller Kit

116-1300-00 Hardware Kit

065-0630-00 1 Complete Repackaging kit

065-0629-00 1 Internal repackaging kit

Part Number Description

003-0293-00 Driver, Magnetic 0.25” drive (no bits), 8” shank

003-0335-00 Tip, #1 Philips Bit, 0.25” drive

003-0336-00 Tip, #2 Philips Bit, 0.25” drive

640600 Mag 27020 Tip, 2.5 mm Hex Bit, 0.25” drive

600T02123 Hex Nutdriver, 5.5 mm (magnetic)

Page 324: Phaser 7750 Service Manual

9-50 Phaser 7750 Printer Service Manual

Page 325: Phaser 7750 Service Manual

10Chapter

Wiring DiagramsIn this chapter...■ Plug/Jack Locations Table

■ Plug/Jack Locator Maps

■ Wiring Diagrams

■ Wiring Schematics

Page 326: Phaser 7750 Service Manual

10-2 Phaser 7750 Printer Service Manual

Plug/Jack Locations

Plug/Jack No. Map Number Item No. Title

2 Map 12 8 HVPS T1, T3, +24V LVPS

15A Map 16 19 I/F PWB, MAIN Motor, LVPS T2

16 Map 16 16 I/F PWB, MAIN Motor, LVPS T2

42 Map 18 10 AC Drive PWB, Noise Filter PWB, Delay PWB

43 Map 18 11 AC Drive PWB, Noise Filter PWB, Delay PWB

46 Map 18 1 AC Drive PWB, Noise Filter PWB, Delay PWB

J70 Map 18 12 AC Drive PWB, Noise Filter PWB, Delay PWB

72 Map 12 9 HVPS T1, T2, +24V LVPS

102 Map 3 1 Inverter Transport Assembly

103 Map 8 4 MSI Unit

104 Map 7 3 Exit Transport Assembly

106 Map 19 3 Left Lower Assembly, Tray 2 Feeder

108 Map 19 2 Left Lower Assembly, Tray 2 Feeder

109 Map 5 4 Registration Transport Assembly

111 Map 3 14 Inverter Transport Assembly

113 Map 3 8 Inverter Transport Assembly

115 Map 17 10 Developer Motor, Tray 2 Size Switch

116 Map 2 3 MOB Sensor Assembly

117 Map 2 1 MOB Sensor Assembly

119 Map 11 5 IBT Belt Assembly

121 Map 11 4 IBT Belt Assembly

122 Map 11 2 IBT Belt Assembly

125 Map 19 7 Left Lower Assembly, Tray 2 Feeder

129 Map 1 10 Xerographic

130 Map 1 9 Xerographic

131 Map 1 7 Xerographic

132 Map 1 5 Xerographic

133 Map 1 16 Xerographic

135 Map 4 5 Duplex Transport Assembly

136 Map 4 6 Duplex Transport Assembly

Page 327: Phaser 7750 Service Manual

10-3

140 Map 3 12 Inverter Transport Assembly

144 Map 2 2 MOB Sensor Assembly

150 Map 19 4 Left Lower Assembly, Tray 2 Feeder

151 Map 1 12 Xerographic

152 Map 1 15 Xerographic

153 Map 1 19 Xerographic

154 Map 1 17 Xerographic

155 Map 5 3 Registration Transport Assembly

163 Map 9 11 Toner Dispense Motor, Main Switch

165 Map 9 8 Toner Dispense Motor, Main Switch

171 Map 1 4 Xerographic

172 Map 7 2 Exit Transport Assembly

203 Map 16 10 I/F PWB, MAIN Motor, LVPS T2

205 Map 19 1 Left Lower Assembly, Tray 2 Feeder

207 Map 1 11 Xerographic

208 Map 16 24 I/F PWB, MAIN Motor, LVPS T2

210 Map 16 22 I/F PWB, MAIN Motor, LVPS T2

211 Map 6 8 Fuser Assembly

212 Map 6 11 Fuser Assembly

214 Map 12 11 HVPS T1, T3, +24V LVPS

215 Map 3 5 Inverter Transport Assembly

216 Map 3 15 Inverter Transport Assembly

217 Map 3 4 Inverter Transport Assembly

218 Map 3 2 Inverter Transport Assembly

219 Map 3 3 Inverter Transport Assembly

220 Map 7 4 Exit Transport Assembly

221 Map 17 7 Developer Motor, Tray 2 Size Switch

222 Map 7 1 Exit Transport Assembly

223 Map 1 8 Xerographic

224 Map 1 6 Xerographic

225 Map 1 3 Xerographic

226 Map 1 20 Xerographic

Plug/Jack No. Map Number Item No. Title

Page 328: Phaser 7750 Service Manual

10-4 Phaser 7750 Printer Service Manual

227 Map 9 17 Toner Dispense Motor, Main Switch

228 Map 9 12 Toner Dispense Motor, Main Switch

229 Map 9 10 Toner Dispense Motor, Main Switch

230 Map 9 9 Toner Dispense Motor, Main Switch

231 Map 5 5 Registration Transport Assembly

232 Map 17 9 Developer Motor, Tray 2 Size Switch

233 Map 1 2 Xerographic

234 Map 17 1 Developer Motor, Tray 2 Size Switch

235 Map 17 2 Developer Motor, Tray 2 Size Switch

237 Map 11 3 IBT Accumulator Belt Assembly

240 Map 5 2 Registration Transport Assembly

251 Map 3 6 Inverter Transport Assembly

255 Map 2 4 MOB Sensor Assembly

260 Map 6 5 Fuser Assembly

261 Map 6 6 Fuser Assembly

262 Map 6 3 Fuser Assembly

263 Map 6 4 Fuser Assembly

264 Map 6 9 Fuser Assembly

265 Map 8 2 Tray 5

288 Map 9 18 Toner Dispense Motor, Main Switch

400 Map 15 8 MCU-MF PWB

40 Map 15 11 MCU-MF PWB

40 Map 15 12 MCU-MF PWB

40 Map 15 2 MCU-MF PWB

40 Map 15 4 MCU-MF PWB

40 Map 15 5 MCU-MF PWB

40 Map 15 6 MCU-MF PWB

407 Map 15 3 MCU-MF PWB

J410 Map 15 10 MCU-MF PWB

P410 Map 16 4 I/F PWB, MAIN Motor, LVPS T2

P460 Map 15 1 MCU-MF PWB

J496 Map 15 9 MCU-MF PWB

Plug/Jack No. Map Number Item No. Title

Page 329: Phaser 7750 Service Manual

10-5

498 Map 15 7 MCU-MF PWB

501 Map 12 19 HVPS T1, T3, +24V LVPS

502 Map 12 6 HVPS T1, T3, +24V LVPS

505 Map 12 7 HVPS T1, T3, +24V LVPS

510 Map 16 23 I/F PWB, MAIN Motor, LVPS T2

510B Map 16 18 I/F PWB, MAIN Motor, LVPS T2

511 Map 16 15 I/F PWB, MAIN Motor, LVPS T2

514 Map 10 3 ROS Assembly

515 Map 10 2 ROS Assembly

516 Map 10 7 ROS Assembly

517 Map 10 8 ROS Assembly

518 Map 10 9 ROS Assembly

526 Map 10 5 ROS Assembly

527 Map 10 1 ROS Assembly

528 Map 10 6 ROS Assembly

529 Map 10 4 ROS Assembly

530 Map 16 13 I/F PWB, MAIN Motor, LVPS T2

531 Map 16 7 I/F PWB, MAIN Motor, LVPS T2

532 Map 16 14 I/F PWB, MAIN Motor, LVPS T2

533 Map 16 1 I/F PWB, MAIN Motor, LVPS T2

534 Map 16 9 I/F PWB, MAIN Motor, LVPS T2

535 Map 16 20 I/F PWB, MAIN Motor, LVPS T2

536 Map 16 8 I/F PWB, MAIN Motor, LVPS T2

538 Map 4 1 Duplex Transport Assembly

539 Map 4 3 Duplex Transport Assembly

540 Map 4 4 Duplex Transport Assembly

541 Map 23 14 TT Module (rear)

546 Map 23 1 TT Module (rear)

547 Map 23 4 TT Module (rear)

548 Map 23 15 TT Module (rear)

549 Map 23 13 TT Module (rear)

551 Map 16 25 I/F PWB, MAIN Motor, LVPS T2

Plug/Jack No. Map Number Item No. Title

Page 330: Phaser 7750 Service Manual

10-6 Phaser 7750 Printer Service Manual

552 Map 16 26 I/F PWB, MAIN Motor, LVPS T2

552 Map 23 6 TT Module (rear)

553 Map 16 17 I/F PWB, MAIN Motor, LVPS T2

553 Map 23 10 TT Module (rear)

554 Map 23 11 TT Module (rear)

555 Map 23 5 TT Module (rear)

557 Map 23 2 TT Module (rear)

561 Map 23 12 TT Module (rear)

564 Map 23 3 TT Module (rear)

568 Map 16 2 I/F PWB, MAIN Motor, LVPS T2

569 Map 16 27 I/F PWB, MAIN Motor, LVPS T2

570 Map 12 4 HVPS T1, T3, +24V LVPS

57 Map 12 17 HVPS T1, T3, +24V LVPS

57 Map 12 3 HVPS T1, T3, +24V LVPS

57 Map 12 1 HVPS T1, T3, +24V LVPS

57 Map 12 18 HVPS T1, T3, +24V LVPS

57 Map 16 12 I/F PWB, MAIN Motor, LVPS T2

57 Map 16 11 I/F PWB, MAIN Motor, LVPS T2

580 Map 12 14 HVPS T1, T3, +24V LVPS

581 Map 12 2 HVPS T1, T3, +24V LVPS

590 Map 18 5 AC Drive PWB, Noise Filter PWB, Delay PWB

592 Map 18 6 AC Drive PWB, Noise Filter PWB, Delay PWB

593 Map 18 14 AC Drive PWB, Noise Filter PWB, Delay PWB

J600 Map 5 1 Registration Transport Assembly

P600 Map 6 10 Fuser Assembly

602 Map 1 24 Xerographic

605 Map 11 1 IBT Accumulator Belt Assembly

608 Map 1 25 Xerographic

J610 Map 8 1 MSI Unit

P610 Map 17 3 Developer Motor, Tray 2 Size Switch

611 Map 7 5 Exit Transport Assembly

J612 Map 3 9 Inverter Transport Assembly

Plug/Jack No. Map Number Item No. Title

Page 331: Phaser 7750 Service Manual

10-7

P612 Map 17 3 Developer Motor, Tray 2 Size Switch

J613 Map 3 10 Inverter Transport Assembly

P613 Map 17 5 Developer Motor, Tray 2 Size Switch

614 Map 1 18 Xerographic

617 Map 19 6 Left Lower Assembly, Tray 2 Feeder

619 Map 1 1 Xerographic

620 Map 5 6 Registration Transport Assembly

622 Map 1 22 Xerographic

623 Map 19 5 Left Lower Assembly, Tray 2 Feeder

624 Map 1 21 Xerographic

P626 Map 3 13 Inverter Transport Assembly

J626 Map 4 2 Duplex Transport Assembly

631 Map 1 23 Xerographic

J633 Map 3 3 Inverter Transport Assembly

P633 Map 3 7 Inverter Transport Assembly

639 Map 16 5 I/F PWB, MAIN Motor, LVPS T2

J640 Map 3 11 Inverter Transport Assembly

P640 Map 17 6 Developer Motor, Tray 2 Size Switch

641 Map 16 6 I/F PWB, MAIN Motor, LVPS T2

646 Map 17 8 Developer Motor, Tray 2 Size Switch

668 Map 12 15 HVPS T1, T3, +24V LVPS

669 Map 12 16 HVPS T1, T3, +24V LVPS

670 Map 20 9 TT Module (Tray 3,4 feeder)

672 Map 20 7 TT Module (Tray 3,4 feeder)

674 Map 23 9 TT Module (rear)

J800 Map 31 8 Finisher (rear) (1 0f 2)

P800 Map 16 21 I/F PWB, MAIN Motor, LVPS T2

801 Map 12 5 HVPS T1, T3, +24V LVPS

814 Map 20 5 TT Module (Tray 3,4 feeder)

815 Map 20 4 TT Module (Tray 3,4 feeder)

816 Map 22 5 TT Module (Tray 3,4,5, Paper Size Switch)

818 Map 20 5 TT Module (Tray 3,4 feeder)

Plug/Jack No. Map Number Item No. Title

Page 332: Phaser 7750 Service Manual

10-8 Phaser 7750 Printer Service Manual

819 Map 20 4 TT Module (Tray 3,4 feeder)

820 Map 22 3 TT Module (Tray 3,4,5 Paper Size Switch)

821 Map 20 6 TT Module (Tray 3,4 feeder)

822 Map 21 1 TT Module (Tray 3,4 feeder)

823 Map 21 2 TT Module (Tray 3,4 feeder)

824 Map 22 3 TT Module (Tray 3,4,5 Paper Size Switch)

825 Map 21 3 TT Module (Tray 3,4 feeder)

826 Map 23 7 TT Module (rear)

827 Map 20 3 TT Module (Tray 2,3 feeder)

828 Map 20 3 TT Module (Tray 2,3 feeder)

829 Map 21 4 TT Module (Tray 2,3 feeder)

841 Map 20 8 TT Module (Tray 2,3 feeder)

842 Map 23 8 TT Module (rear)

J903 Map 12 13 HVPS T1, T3, +24V LVPS

J925 Map 12 12 HVPS T1, T3, +24V LVPS

FS37 Map 6 2 Fuser Assembly

FS38 Map 6 1 Fuser Assembly

FS39 Map 18 3 AC Drive PWB, Noise Filter PWB, Delay PWB

FS40 Map 18 2 AC Drive PWB, Noise Filter PWB, Delay PWB

FS41 Map 18 4 AC Drive PWB, Noise Filter PWB, Delay PWB

FS45 Map 18 9 AC Drive PWB, Noise Filter PWB, Delay PWB

FS47 Map 18 7 AC Drive PWB, Noise Filter PWB, Delay PWB

FS48 Map 18 8 AC Drive PWB, Noise Filter PWB, Delay PWB

FS51 Map 12 10 HVPS T1, T3, +24V LVPS

FS56 Map 9 14 Toner Dispense Motor (Y,M,C,K), Main Switch

FS57 Map 9 13 Toner Dispense Motor (Y,M,C,K), Main Switch

FS61 Map 18 16 AC Drive PWB, Noise Filter PWB, Delay PWB

FS62 Map 18 15 AC Drive PWB, Noise Filter PWB, Delay PWB

FS68 Map 9 15 Toner Dispense Motor (Y,M,C,K), Main Switch

FS69 Map 9 16 Toner Dispense Motor (Y,M,C,K), Main Switch

FS76 Map 18 13 AC Drive PWB, Noise Filter PWB, Delay PWB

FS77 Map 18 17 AC Drive PWB, Noise Filter PWB, Delay PWB

Plug/Jack No. Map Number Item No. Title

Page 333: Phaser 7750 Service Manual

10-9

FS90 Map 18 18 AC Drive PWB, Noise Filter PWB, Delay PWB

FS134 Map 1 13 Xerographic

FS135 Map 1 14 Xerographic

FS180 Map 9 19 Toner Dispense Motor (Y,M,C,K), Main Switch

FS181 Map 9 1 Toner Dispense Motor (Y,M,C,K), Main Switch

FS182 Map 9 2 Toner Dispense Motor (Y,M,C,K), Main Switch

FS183 Map 9 3 Toner Dispense Motor (Y,M,C,K), Main Switch

FS184 Map 9 4 Toner Dispense Motor (Y,M,C,K), Main Switch

FS185 Map 9 5 Toner Dispense Motor (Y,M,C,K), Main Switch

FS186 Map 9 6 Toner Dispense Motor (Y,M,C,K), Main Switch

FS187 Map 9 7 Toner Dispense Motor (Y,M,C,K), Main Switch

FS812 Map 20 1 TT Module (Tray 3,4 feeder)

FS813 Map 20 2 TT Module (Tray 3,4 feeder)

Plug/Jack No. Map Number Item No. Title

Page 334: Phaser 7750 Service Manual

10-10 Phaser 7750 Printer Service Manual

Plug/Jack Locator Maps

Map 1 -

7750-062

P/J207

P/J130

P/J223

P/J129P/J131P/J132P/J224P/J171

P/J225P/J233

P/J619

P/J608

P/J602

P/J631

P/J622

P/J624

P/J226

P/J614

P/J154

P/J133

P/J152P/J135

P/J134P/J151

Page 335: Phaser 7750 Service Manual

10-11

Map 2 - MOB Sensor Assembly

7750-063

P/J117

P/J144

P/J255

P/J116

Page 336: Phaser 7750 Service Manual

10-12 Phaser 7750 Printer Service Manual

Map 3- Inverter Transport

7750-064

P/J102P/J218

J633P/J217

P/J215P/J251

INVERTER TRANSPORT ASSEMBLY

P/J216

P/J111

P626

P/J140

P633

P/J113

J612

J613

J640

Page 337: Phaser 7750 Service Manual

10-13

Map 4 - Duplex Transport

P/J136 P/J538

J626

P/J539P/J540

P/J135

DUPLEX TRANSPORT ASSEMBLY7750-065

Page 338: Phaser 7750 Service Manual

10-14 Phaser 7750 Printer Service Manual

Map 5 - Fuser

7750-066

P/J109

P/J240

7.2.6 FUSER ASSEMBLYJ600

P/J155

P/J620

P/J231

REGISTRATION TRANSPORT ASSEMBLY

ROS SHUTTER MOTOR

Page 339: Phaser 7750 Service Manual

10-15

Map 6 - Fuser

P/J212

P/J211P/J264(WHT)

P600(BLK)

FUSER REAR

P/J260(BLU)

P/J261(RED)

P/J263 P/J262

FS38

FS37

7750-067

Page 340: Phaser 7750 Service Manual

10-16 Phaser 7750 Printer Service Manual

Map 7 - Exit Transport

7750-068

P/J104

P/J220P/J611

P/J222

P/J172

Page 341: Phaser 7750 Service Manual

10-17

Map 8 - Tray 1

Map 9 - Toner Dispense Motor (YMCK) Switch

J610P/J265

P/J219

P/J103

7750-069

7750-070

FS180

P/J288

P/J227

FS69

FS68FS56

FS57

P/J228

P/J163

P/J229

P/J230

P/J165

FS187

FS186FS185FS184FS183

FS182FS181

Page 342: Phaser 7750 Service Manual

10-18 Phaser 7750 Printer Service Manual

Map 10 - ROS (Laser) Assembly

Map 11 - Accumulator Belt

P/J527

P/J515P/J514

P/J529

P/J526

P/J528

P/J516

P/J517

P/J518

7750-071

7750-072

P/J605 P/J122

P/J237

P/J121

P/J119

Page 343: Phaser 7750 Service Manual

10-19

Map 12 - HVPS (T1 and T3) and +24V LVPS

P/J572P/J570 P/J801 P/J502

P/J505

P/J2

P/J72

FS51P/J214

J925J903

P/J580P/J668P/J669

P/J571

P/J574

P/J501

P/J573P/J581

HVPS T3

7750-073

Page 344: Phaser 7750 Service Manual

10-20 Phaser 7750 Printer Service Manual

Map 15 - Fuser Fuse BoardP460

MCU PWB (BOTTOM VIEW)

P/J401

P/J402

P/J403P/J407

P/J404P/J405

P/J406P/J498

P/J400

J496

J410

7750-076

Page 345: Phaser 7750 Service Manual

10-21

Map 16 - I/F Power Board, Main Motor, LVPS and T2

P/J533 P/J568

P/J550P410

P/J639P/J641 P/J531 P/J536

P/J534

P/J203

P/J576

P/J575

P/J530

P/J532P/J511P/J16

P/J553P/J510B

P/J15AP/J535

P800

P/J210

P/J510

P/J208

P/J551

P/J552

P/J569

7750-077

Page 346: Phaser 7750 Service Manual

10-22 Phaser 7750 Printer Service Manual

Map 17 - Developer Motor and Tray 2 Size Switch

7750-078

P/J235P/J234

P610

P612

P613

P640

P/J221

P/J646

P/J232

P/J115

Page 347: Phaser 7750 Service Manual

10-23

Map 18 - AC Drive, Noise Filter, and Delay Board

J70 FS76 P/J593

FS90 FS77 FS61 FS62

DELAY PWBNOISE FILTER PWB

AC DRIVE PWB

P/J46 FS40 FS39 FS41 P/J590

P/J592FS47FS48FS45P/J42

P/J43

7750-079

Page 348: Phaser 7750 Service Manual

10-24 Phaser 7750 Printer Service Manual

Map 19 - Left Lower Assembly and Tray 2 Feeder

P/J205 P/J108

P/J106

TRAY 2 FEEDER

P/J125

P/J617

P/J623

P/J150

7750-080

Page 349: Phaser 7750 Service Manual

10-25

Map 20 - Tray 3 and 4 Feeders (HCF)

LH COVERINTERLOCK SWITCH

FS813

FS812

7750-081

TRAY3 : P/J827TRAY4 : P/J828

TRAY3 : P/J815TRAY4 : P/J819

TRAY3 : P/J814TRAY4 : P/J818

TRAY 3,4, FEEDER

P/J670

P/J841

P/J672

P/J821

TRAY 3 FEEDER

TRAY 4/5 FEEDER

Page 350: Phaser 7750 Service Manual

10-26 Phaser 7750 Printer Service Manual

Map 21 - Tray 3 Feeder (HCF)

P/J822

P/J823

P/J829

P/J825

TRAY 3 FEEDER7750-082

Page 351: Phaser 7750 Service Manual

10-27

Map 22 - Trays 3, 4, and 5 Paper Size Switches (HCF)

7750-083

TRAY 5 PAPERSIZE SWITCH

TRAY 4 PAPERSIZE SWITCH

TRAY 3 PAPERSIZE SWITCH

P/J824

P/J816

P/J820

Page 352: Phaser 7750 Service Manual

10-28 Phaser 7750 Printer Service Manual

Map 23 - (HCF) Lower Tray (Rear)

P/J548P/J541 P/J549

P/J561 P/J554

P/J553 P/J674

P/J842

P/J826P/J552

P/J555

P/J547P/J564

P/J557P/J546

7750-084

Page 353: Phaser 7750 Service Manual

10-29

Wiring Diagrams

+24 VDC - 1 of 2

+24V

LOW

VOLTA

GEPO

WER

SUPP

LY

LH CO

VER

INTER

LOCK

SWITC

H

LH ON

TINT

ERLO

CKSW

ITCH

J502

J172

ORN OR

N

ORN

ORN

ORN

BLU

A1B1

B1

ESS P

WBJ30

0

A+2

4 VDC

(2 OF

X)

B+2

4 VDC

(3 OF

X)

C+2

4 VDC

(3 OF

X)

SEE W

IRE NE

T+2

4VDC

-2

1.71.7

1.7 J172

J171

J171

J569

J569

ORN

ORN

ORN

ORN

A1

I/F PW

BJ53

5A1

BLU

+24V

DCINT

LK

SEE W

IRE NE

T+2

4VDC

-3

SAFET

YRE

LAY P

WB

21

+24V

DCJ53

0

J505

P668

J555

J400

12 67

7

3 1241

TRAY

MODU

LEPW

B

7.3.13

+ 24

VDC-1

7750

-259

Page 354: Phaser 7750 Service Manual

10-30 Phaser 7750 Printer Service Manual

+24 VDC 2 of 2

DEVE

MOT

OR9.

9

9.19

9.18

9.24

A

6.10

9.17

9.29

DRUM

MOT

OR(K

)

DRUM

MOT

OR(Y

,M,C

)

9.2

9.1

HVPS

T6

2ND

BTR

RETR

ACT

MOT

OR

1ST

BTR

RETR

ACT

MOT

OR

IBT

STEE

RING

MOT

OR

ROS

SHUT

TER

MOT

OR

AGIT

ATOR

MOT

OR

+24

VDC

+24V

DCIN

TLK

J531

J551

ORN

I/F P

WB

+24V

DCIN

TLK

BLU

BLU

BLU

J533

BLU

YEL

YEL

ORN

ORN

3 A16

B8 B9 5 B5 A3 A15

B9 B11

B1 A16

1

ORN

ORN

BLU

YEL

BLU

J535

J534

J532

N.C.

J533

J550

P207

J207

J240

P240

J233

P233

J232

J235

J210

J576

ORN

ORN

ORN

261421

15

153

B5A5

43

34

4

13 12 DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UGDO

UBLE

PLUG

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UGP6

12

P639

J639

IBT

MOT

OR

P605

J605

J237

P237

J612

P216

J216

A

A

9.15

4.1

TONE

R DI

SPEN

SEM

OTOR

(K)

1

9.15

TONE

R DI

SPEN

SEM

OTOR

(C)

1

9.15

TONE

R DI

SPEN

SEM

OTOR

(M)

1

9.15

J227

J533 BL

U

BLU

BLU

BLU

ORN

ORN

HVPS

T5

ORN

ORN

BLU

HVPS

T7

I/F P

WB

A2 A4 A6 A8 1

1

2

2

1311

11

12

B15

B14

J228

J229

J230

J203

J534

J553

J501

J572

J573

TONE

R DI

SPEN

SEM

OTOR

(Y)

1

7750

-260

Page 355: Phaser 7750 Service Manual

10-31

Main Power

1.1B 3.4

3.4

1.1B

1.1B

MCU

PW

BPL

13.

1

DELA

Y RE

LAY

ON (L

)+24

VDC

NOIS

E FI

LTER

PW

BPL

9.2

GFI B

REAK

ERPL

9.2

1

1 2DC

COM

J404

J646

P646

J593

BLU

BLU

BLK

BLK

J50

2 1

2 1

1 2

DOUB

LEPL

UG

YEL

YEL

+24V

DC

CIRC

UIT

PROT

ECTO

R

NOIS

EFI

LTER

GFI

J72

12FS

75

FS74

WHT

FS76

FS77

PLUG

IN A

CH

PLUG

IN A

CH

J70

1

FS90

FS61

FS62

BLK

PLUG

IN A

CH

POW

ER O

N AC

H

BLK

PLUG

IN A

CN

FS51

WHT

T55

G/Y

DELA

YRE

LAY

PWB

PL9.

2

RELA

Y ON

ACH

(TO

AC D

RIVE

)

PLUG

IN A

CN(T

O AC

DRI

VE)

BLK

PLUG

IN A

CH(T

O PS

W O

UTLE

T)

BLK

PLUG

IN A

CH(T

O PS

W O

UTLE

T)

POW

ER O

N AC

H(T

O AC

DRI

VE)

BLK

WHT

WHT

I/F P

WB

PL9.

1 DC C

OM

DOUB

LEPL

UG

DOUB

LEPL

UG

A4J5

36J2

882

2

31

P288

P288

J288

J536

A511

7BL

U

FS68

FS56

BLK

BLK

FS57

(2)

(1)

(3)

(4)

FS69

BLU

MAI

NPO

WER

SWIT

CHPL

10.2

DC33

0 [0

08-1

11]

MAI

N PO

WER

SWIT

CHST

ATUS

ON(1

)+3

3VDC

I/F PWB

PL9.

1

MCU

PW

BPL

13.1

+3.3

VDC

7750

-261

Page 356: Phaser 7750 Service Manual

10-32 Phaser 7750 Printer Service Manual

Main Power 2 of 2

1.1A

10.1

TBD

TBD

1.4

1.4

1.3

1.3

1.5

1.5

1.6

1.6

3.3B

3.3C

3.3B

3.3C

10.1

1.1A

1.1A

POW

ER O

N A

CH(T

O A

CCES

SOR

Y)

POW

ER O

N A

CH(T

O A

CCES

SOR

Y)

REL

AY O

N A

CH(T

O A

C D

RIV

E)

POW

ER O

N A

CH(T

O A

C D

RIV

E)

POW

ER O

N A

CH(T

O +

3.3V

LVP

S 2)

POW

ER O

N A

CH(T

O +

3.3V

LVP

S 2)

POW

ER O

N A

CH(T

O +

3.3V

LVP

S 1)

POW

ER O

N A

CH(T

O +

3.3V

LVP

S 1)

POW

ER O

N A

CH(T

O +

24V

LVPS

1)

POW

ER O

N A

CH(T

O +

24V

LVPS

1)

POW

ER O

N A

CH(T

O II

T O

UTL

ET)

POW

ER O

N A

CH(T

O II

T O

UTL

ET)

POW

ER O

N A

CH(T

O +

5V L

VPS)

POW

ER O

N A

CH(T

O +

5V L

VPS)

PLU

G IN

ACH

(TO

AC

DR

IVE) W

HT

BLK

BLK

BLK

FS45

BLK

FS40

WH

TFS

39

J46

J46

J43 BL

K

BLK

BLK

BLK

J42 BL

K

N.C

.

N.C

.

N.C

.

N.C

.

BLK

WH

T

WH

T

WH

T

WH

T

WH

T

WH

T

9 1 2 3 9 10 11 121 2 3 4410 11 12

31

AC D

RIV

EPW

BPL

9.2

AC D

RIV

E

CHO

KECO

ILPL

9.1

1.1B

MAI

N P

OW

ER O

N (

2 O

F 2)

7750

-262

Page 357: Phaser 7750 Service Manual

10-33

LVPS Control

1.3

1.4

1.4

1.5 1.9

1.5

1

4

4

3

2

SLEE

P SW

ITCH

SIGN

AL2.

1

IOT

POW

ERCO

NTRO

LSI

GNAL

1.2

LVPS

CON

TROL

ESS

PWB

PL13

.1

+3.3

VDC

P/J4

60B7

DC C

OM+3

.3VD

C

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

P/J4

1011

9B1 B2

DC C

OMB4

101

+5VD

C

+3.3

VDC

J534 YE

L

VIO

YEL

VIO

YEL

YEL

+5V

LVPS

ENAB

LE (L

) +3.

3VDC

MCU

+3.

3VEN

ABLE

SIG

NAL

+24V

LVP

SEN

ABLE

(H) +

5VDC

+5V

LVPS

ENAB

LE R

ETUR

N

MCU

+3.

3VEN

ABLE

SIG

NAL

+5V

LVPS

ENAB

LE (L

) +3.

3VDC

+24V

LVP

SEN

ABLE

(H) +

5VDC

+5V

LVPS

ENAB

LE R

ETUR

N

DC C

OM DC C

OM

+24V

DC

MCU

PW

BPL

13.1

B12

B11

B14

J406

BLU

BLU

BLU

DC33

0 [0

04-0

50]

LVPS

FAN

HIG

HSP

EED

(L) +

24VD

CJ2

14P2

14

+24V

DC

DC C

OM

32

41

14

DOUB

LEPL

UG

MOT

FAN

LVPS

FAN

PL9.

13

2P2

14J2

14

DOUB

LEPL

UGDC

330

[004

-200

]LV

PS F

ANLO

CKED

(H) +

3.3V

DC

BLU

J406

B13M

CU P

WB

PL13

.1

LVPS

FAN

LOC

KFA

IL S

IGNA

L

LVPS

COO

LING

AIR

In S

leep

Mod

e, M

/C tu

rns

off t

he +

5V L

VPS

and

+24V

LVP

S En

able

signa

l to

cut o

ff th

e +5

V DC

and

+24

V DC

out

put.

In S

leep

Mod

e, th

roug

h +3

.3V

LVPS

rem

ains

on, +

3.3V

DC

supp

lied

toeit

her o

f the

PW

Bs is

cut

off

to p

art o

f ESS

PW

B an

d all

the

parts

of

MCU

PW

B (S

ee C

H 1.

3.)

LVPS

Fan

sta

rts lo

w-sp

eed

rota

tion

at p

ower

on

and

keep

s it

with

M/C

on s

tand

by.

LVPS

Fan

sta

rts h

igh

spee

d ro

tatio

n at

Main

Mot

or O

n an

d tra

nsits

tolo

w-sp

eed

rota

tion

15se

c (a

djus

tabl

e in

NVM

) afte

r Main

Mot

or O

ff.In

Slee

p M

ode,

LVP

S Fa

n st

ops

rota

ting

beca

use

+24V

DC

is cu

t off.

1 2

NOTE

:

7750

-263

Page 358: Phaser 7750 Service Manual

10-34 Phaser 7750 Printer Service Manual

DC Power Generation 3.3 VDC1

2

1.2

16.1

7.11 7.1

ALL

ALL

ALL

ON/

OFF

ALL

1.1B

1.1B

MCU

+3.

3VEN

ABLE

SIG

NAL

POW

ER O

N AC

H(T

O +3

.3V

LVPS

)

POW

ER O

N AC

H(T

O +3

.3V

LVPS

)

1.3

DC P

OWER

GEN

ERAT

ION

(3.3

VDC)

+3.3

V LO

W V

OLTA

GEPO

WER

SUP

PLY

1 PL

9.1

J15A

BLK

WHT GR

N

+3.3

VDC

POW

ERGE

NERA

T-IO

N

12 6 9 4 8 11

1

1 2

3 4 8 10 11

1 3 5 7VI

O

GRY

VIO

GRY

VIO

GRY

VIO

GRY

GRY

GRY

GRY

GRY

GRY

GRY

VIO

VIO

VIO

VIO

VIOP510P5

10

P510

P668

J668

J555

J510

J300

J400

VIO

3 5

T3

B8B9B6

B5 B7

B11

ESS

PWB

PL13

.1

+3.3

VDC-

1+3

.3VD

C

+3.3

VDC

+3.3

VDC-

2

MCU

PW

BPL

13.1

1/F

PWB

P19.

1P/

J410

32 56

B3 B10

J532

YEL

YEL

J536

+3.3

VDC

(MSI

SIZ

E SE

NSOR

)

+3.3

VDC

TRAY

1SI

ZE S

ENSO

R

WIT

H 3T

M

ATTM

(FX

ONLY

)

TRAY

MOD

ULE

PWB

PL15

.9/ 1

6.15

55

6

5 66

DC C

OM

1 2

Wiri

ng in

MCU

PW

B

Shor

t Circ

uit P

rote

ctio

n (O

verc

urre

nt P

rote

ctio

n)W

hen

+3.3

V DC

circ

uit i

s sho

rted,

the o

utpu

t dro

ops.

The o

utpu

t aut

o-re

cove

rs in

10

sec.

afte

r rec

over

y fro

m th

e sho

rt cir

cuit.

Over

volta

ge P

rote

ctio

nW

hen

+3.3

V DC

out

put r

each

es +

4-+5

V DC

, the

out

put i

s cut

off.

The o

utpu

t rec

over

s at p

ower

on

60 se

c afte

r pow

er o

ff.

NOTE

:

7750

-264

Page 359: Phaser 7750 Service Manual

10-35

DC Power Generation 5 VDC

1.2

1.2

1.1B

1.1B

+5V

LVPS

ENA

BLE

(L) +

3.3

VDC

+5V

LVPS

ENAB

LE R

ETUR

N

POW

ER O

N AC

H(T

O +5

V LV

PS)

POW

ER O

N AC

H(T

O +5

V LV

PS)

+5V

LOW

VOL

TAGE

POW

ER S

UPPL

Y PL

9.1

+5VD

CON

/OFF

CONT

ROL

+5VD

CPO

WER

GENE

RATI

ON

J511

J511

YEL

VIO

BLK

WHT GR

Y

1 5 1 3 5

2 4 8

6 13

3 7 6

T3

J16

1

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

VIO

VIO

GRY

VIO

VIO+5

VDC +5

VDC

DC C

OM

DC C

OM

DC C

OM

J300

1.4

DC P

OWER

GEN

ERAT

ION

(+5V

DC)

ESS

PWB

PL13

.1

ALL

ALL

1.7

ALL

ALL

ALL

ALL

ALL

ALL

J400

5 3

I/F P

WB

PL9.

1

J530

GRY

VIO

J530

J534

2 4

1 3 B5 B3

YEL

YEL

YEL

YEL

MCU

PW

BPL

13.1

A5 4A7

DOUB

LEPL

UGDO

UBLE

PLUG

+5VD

C

+5VD

C(T

O IN

TERL

OCK)

+5VD

C

J406

J400

P640

J640

J626

J538

P626

YEL

YELDC

COM

10 8

2A3 A1

B3 B14

2 4

WIT

H DU

PLEX

(FXA

P:ST

ANDA

RD)

DUPL

EX P

WB

PL12

.2

1.5

1.5

+5VD

C(T

O +2

4V L

VPS)

DC C

OM(T

O +2

4V L

VPS)

1Sh

ort C

ircui

t Pro

tect

ion

(Ove

rcur

rent

Pro

tect

ion)

Whe

n +5

V DC

circ

uit i

s sh

orte

d, th

e ou

tput

dro

ps.

The

outp

ut a

uto-

reco

vers

in 1

0sec

afte

r rec

over

y fro

m th

e sh

ort.

Over

volta

ge P

rote

ctio

nW

hen

+5v

DC o

utpu

t rea

ches

+6-

8V D

C, th

eou

tput

is c

ut o

ff. T

he o

utpu

t rec

over

s at

pow

eron

60s

ec a

fter p

ower

off.

77

50-2

65

Page 360: Phaser 7750 Service Manual

10-36 Phaser 7750 Printer Service Manual

DC Power Generation +24 VDC

1.2

1.4

1.4

1.1B

+24V

LVPS

ENA

BLE

(H) +

5VDC

+5VD

C(T

O +2

4V LV

PS)

DC C

OM(T

O +2

4V LV

PS)

POW

ER O

N AC

H(T

O +2

4V LV

PS)

1.1B

POW

ER O

N AC

H(T

O +2

4V LV

PS)

1.2

ALL

ALL

ALL

ALL

ALL

ALL

ALL1.

7

ALL 1.

8

12.1

12.1

1.7

ALL

ALL

YEL

YEL

YEL

BLK

WHT

J505

+24V

LOW

VOL

TAGE

POW

ER S

UPPL

YPL

9.1

1.5

DC P

OWER

GEN

ERAT

ION

(+24

VDC)

+24V

DC O

N/OF

FCO

NTRO

L

=24V

DCPO

WER

GENE

RATI

ON

1

1GR

N

+24V

LVPS

COOL

ING

AIR

+24V

DC

+24V

DC

ORN

DC C

OM

DC C

OM

DC C

OM

DC C

OM

VIO

J400

I/F P

WB

PL9.

1J5

30

ORN

VIO VIO

J505

J502

ORN

VIO

DC C

OM

+24V

DC

J502 +2

4VDC

J300

ORN

DC C

OM

VIO

1 4 8

7 14A4 A6 8

36

12

10 7 8 911

6 5

77 2 6 1 6

A B

T3

3 34 42

J2

ESS

PWB

PL13

.1

MCU

PW

BPL

13.1

A

B

J400

VIOJ406

P406

+24V

DC

YEL

YEL

DC C

OM

11 9

A4 A7

B4 B7

1 3

DOUB

LEPL

UGJ6

40

GRY

GRY

GRY

GRY

DRAW

ERCO

NNEC

TOR

P626

J626

J538

DUPL

EX P

WB

PL12

.2

VIO

VIO

VIO

VIO

VIO

VIO

DC C

OM

DC C

OM

DC C

OM

ORN

ORN

ORN

+24V

DC

+24V

DCJ5

30BL

U

BLU

BLU

P668

J555

J554

J561

J561 N.C

7 8

7 8

3 4

3 4

7 8 3 4

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

N.C

+24V

DC(T

O TM

INTE

RLOC

K)

+24V

DC (T

OFI

NISH

ER)

DC C

OM(T

O FI

NISH

ER)

DC C

OM(T

O LD

POW

ER P

WB)

+24V

DC(T

O IN

TERL

OCK)

ORN

7750

-266

Page 361: Phaser 7750 Service Manual

10-37

Power Interlock Switching

A1B1

J172

J172

LH C

over

Inte

rlock

Switc

hPL

2.10

A1B1

RH C

over

Inte

rlock

Switc

hPL

2.10

A1B1

J171

J173

J173

J569

J569

J171

Fron

t Cov

erIn

terlo

ckSw

itch

PL10

.1

ORN

ORN

DRUM

(M)

PL4.

1

58

DRUM

(Y)

PL4.

1

58

1

1

2 4

5

DRUM

(C)

PL4.

1

53

8

DRUM

(K)

PL4.

1

58

1 1.9

1 1.9

1.5 1.5

1.4

1.7

POW

ER IN

TERL

OCK

SWIT

CHIN

G

+24V

DC(T

OIN

TERL

OCK)

+5VD

C(T

OIN

TERL

OCK)

ORN

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

GRY

YEL

GRY

GRY

YEL

ORN

BLU

FS13

5

WAS

TECA

RTRI

DGE

INTE

RLOC

KSW

ITCH

PL4.

1FS

134

21

P631

J154

J154

J535

J153

J153

WAS

TECA

RTRI

DGE

INTE

RLOC

KCL

OSED

(H) +

5VDC

DC33

0 [0

01-3

00]

FRON

T IN

TERL

OCK

CLOS

ED (H

) +24

VDC

DC33

0 [0

01-3

01]

LH C

OVER

INTE

RLOC

KCL

OSED

(H) +

24VD

C

J531

J535

A3 B131

DC C

OM

DC C

OM

DC C

OM

DC C

OM

A

B

A187

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1+3

.3VD

C

+3.3

VDC

+3.3

VDC

+3.3

VDC

100

P/J4

1086 27

DC33

0 [0

01-3

06]

DRUM

INTE

RLOC

KCL

OSED

(H) +

5VDC

LD P

OWER

+5VD

CJ4

00LD

P0W

ER+5

VDC

ALL

J151

J631

J568

J568

J151

J152

J152

DC C

OM

VIO

VIO

AB

Inte

rlock

Rela

yPW

BPL

9.1

LH C

OVER

INTE

RLOC

KSW

ITCH

SENS

ED

FRON

TIN

TERL

OCK

SWIT

CHSE

NSED

1

NOTE

Virtu

al Li

ne

P/J4

10

9

Inte

rlock

Rela

y PW

BPL

9.1

7750

-267

Page 362: Phaser 7750 Service Manual

10-38 Phaser 7750 Printer Service Manual

Tray Module Power Interlock Switching

1.5

ALL

1.91

+24V

DC(TO

TM IN

TERL

OCK)

BLU

BLU

1.8 TR

AY M

ODUL

E POW

ER IN

TERL

OCK S

WITC

HING

FS81

2FS

813

TRAY

MOD

ULE L

HCO

VER

INTE

RLOC

KSW

ITCH

PL15

.10/16

.13DC

330 [

001-3

04]

TRAY

MOD

ULE L

H COV

ERIN

TERL

OCK C

LOSE

D (H)

+24V

DCJ5

543

DC CO

M+5VD

C

+24V

DCTM

INTL

K

TRAY

MOD

ULE P

WBPL

15.9/

16.5

TRAY

MOD

ULE

LH CO

VER

INTE

RLOC

K SWI

TCH

SENS

ED SI

GNAL

7750

-268

NOTE

Virtua

l Line

1

Page 363: Phaser 7750 Service Manual

10-39

Main Motor Drive Control

4

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

10J5

3410

9B1

1

B10

B9 B7 B15

B14

B13

B12

108

107

105

DC C

OM

DC C

OM

DC C

OM

DC C

OM

BLU

BLU

BLU

BLU

ORN

ORN

VIO

VIO

+24V

DCIN

TLK

DC C

OM

4

2 2 2 2

Mai

n M

otor

ON

(L) +

5VDC

MAI

N M

OTOR

HIGH

SPE

ED 1

(L) +

5VDC

MAI

N M

OTOR

HIGH

SPE

ED 2

(L) +

5VDC

MAI

N M

OTOR

CLOC

K +5

VDC

+24V

DC IN

TERL

OCK

+24V

DC IN

TERL

OCK

DC C

OM

DC C

OM

J203

NAIN

MOT

ORPL

1.1

MOT

3

FGSE

RVO

CONT

ROL

J203

MAI

N M

OTOR

FAIL

(H) +

3.3V

DCJ5

34

BLU

8

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1+3

.3VD

C

P/J4

10B8

106

4.1B

4.1A

MAI

N M

OTOR

DRI

VE C

ONTR

OL (1

of 2

)

This

driv

es a

t hig

h sp

eed

for s

tand

ard

pape

r and

hal

f spe

ed fo

r OHP

film

Mai

n M

otor

rota

tes

at n

orm

al s

peed

wih

DC3

30 [0

04-0

04] o

n, a

t hal

f spe

ed w

ithDC

330

[004

-007

] on,

and

at d

oubl

e sp

eed

with

DC

330

[004

-008

] on.

1 2

NOTE

:

3 4

Rota

tion

spee

d is

con

trolle

d co

mar

ed w

ith th

e in

tern

al c

lock

.

Mai

n M

otor

Fai

l Det

ectio

n is

dis

able

d.

5 6 7 9 1 2 3 4

7750

-269

Page 364: Phaser 7750 Service Manual

10-40 Phaser 7750 Printer Service Manual

Laser Control Y (As an Example)

VIDE

O DA

TA Y

7

VIDE

O DA

TA Y

6

VIDE

O DA

TA Y

5

VIDE

O DA

TA Y

4

VIDE

O DA

TA Y

3

VIDE

O DA

TA Y

2

VIDE

O DA

TA Y

1

VIDE

O DA

TA Y

0

VALI

D Y

VIDE

O CL

OCK

PAGE

REQ

UEST

Y

LINE

REQ

UEST

Y

1

2

36.

12C

6.9

36.

12C

ESS

PWB

PL13

.1M

CU P

WB

PL13

.1

6.5A

LAS

ER C

ONTR

OL A

ND S

CANN

ING

(Y) (

1 of

2)

P/J4

60A9 B9 A1

0

B10

A12

B12

A13

B13

B16

B28

A16

A17

MCU

PW

BPL

13.1

MCU

PW

BPL

13.1

ROS

ASSY

PL3.

1SO

S PW

B (Y

)

J401

+5VD

C

+5VD

C

+5VD

C

+5VD

C

+5VD

CIN

TERL

OCK

+5VD

CDC

COM

DC C

OMVI

OGRY

B14

B16

J516

1 3

POLY

GON

MIR

ROR

DRIV

E

A11

A12

A13

A17

B4 B18

B20

DC C

OM

DC C

OM

DC C

OM

+5VD

CIN

TERL

OCK

GRY

GRY

YEL

YEL

YEL

VIO

J401

YEL

VIDE

O DA

TA (Y

) +

VIDE

O DA

TA (Y

) +

LASE

R DI

ODE

(Y)

POW

ER S

IGNA

L

DC30

0 [0

06-0

30]

LASE

R DI

ODE

(Y)

ENAB

LE (L

) +5V

DC

LASE

R DI

ODE

(Y)

POW

ER C

ONTR

OLON

(L) +

5VDC

DC C

OM

+5VD

C IN

TERL

OCK

J516

SOS

(Y)

SENS

ED (L

) +5V

DC

YEL

B15

2

DC C

OM

6 7 3 4 5 2 1

LDD

PWB

(Y)

ROS

ASSY

PL13

.1

J529

LD D

RIVE

CONT

ROL

LASE

R DI

ODE

LDPD

WAR

NING

LASE

R HA

ZARD

NO D

IREC

TEX

POSU

RE

SOS

(Y)

SENS

ED S

IGNA

L

MOD

ULAT

EDLA

SER

BEAM

(Y)

ZONE K3

ROS

CONT

ROL

FAIL

SIG

NAL

ZONE K4

1 2 3

Conv

erts

vid

eo d

ata

from

ESS

in re

solu

tion

and

vide

o cl

ock

spee

d an

dco

rrec

ts a

col

or m

isre

gi q

ty b

y Re

gi C

ontro

l.

Turn

ing

on D

C330

[006

-030

] mak

es E

nabl

e Si

gnal

on

for a

ll th

e co

lors

.

Virtu

al L

ine

NOTE

:

7750

-270

Page 365: Phaser 7750 Service Manual

10-41

Laser Scan Drive Control

6.9 LA

SEER

SCAN

DRIVE

CONT

ROLL

ER

MCU P

WBPL

13.1

DC CO

M

DC CO

M

DC CO

M

+24V

DC

J402

DC 33

0 [00

6-031

]RO

S MOT

ORON

(L) +

6VDC

DC 33

0 [00

6-031

]RO

S MOT

ORRE

F CLO

CK

YEL

YEL

YEL

TD 1

TD 11 2

ORN

VIO

+24V

DC

DC CO

M

ROS A

SSY

PL3.1

1

ROS M

OTOR

MOT

FG

J518

DC33

0 [00

6-160

]RO

S MOT

ORRE

ADY (

L) +3

.3VDC

DC CO

M

VIO

MCU P

WBPL

13.1

+3.3V

DC

J402

ROS M

OTOR

READ

Y SIGN

AL

POLY

GON M

IRROR

DRIVE

6.12C

6.5A

4 2 6 5

J518

2

4 6

3 5 1 2

3 1

Contr

ols ro

tation

speed

in co

mpari

son

with R

OS M

otor R

ef Clo

ck.

Virtua

l Line

Test

Point

on M

CU PW

B J40

2-2(+)

GND(

_)A f

reque

ncy o

f app

rox. 2

.5KHz

7750

-274

Page 366: Phaser 7750 Service Manual

10-42 Phaser 7750 Printer Service Manual

Laser Shutter ControlM

CU P

WB

PL13

.1I/F

PW

BPL

9.1

P/J4

10

+5VD

C

+5VD

C

DC C

OM

DC C

OM

DC C

OM

DC C

OMDC

COM

DC C

OMDC

COM

DC C

OM

DC C

OM

DC C

OM

1

13 12 11 10

+24V

DCIN

TERL

OCK

YEL

YEL

YEL

YEL

YEL

J533

J240

P240

B1 B2 B3 B4 B5

DC33

0-[0

09-0

40] C

LOSE

DC33

0 [0

09-0

41] O

PEN

ROS

SHUT

TER

MOT

ORON

+24

V CL

OCK

DC33

0-[0

09-0

40] C

LOSE

DC33

0 [0

09-0

41] O

PEN

ROS

SHUT

TER

MOT

ORON

+24

V CL

OCK

DC33

0-[0

09-0

40] C

LOSE

DC33

0 [0

09-0

41] O

PEN

ROS

SHUT

TER

MOT

ORON

+24

V CL

OCK

DC33

0-[0

09-0

40] C

LOSE

DC33

0 [0

09-0

41] O

PEN

ROS

SHUT

TER

MOT

ORON

+24

V CL

OCK

DOUB

LEPL

UG

12345

54321

ZONE C5

MOT

+24V

DC IN

TERL

OCK

6.10

ROS

SHU

TTER

CON

TROL

For p

reve

ntin

g RO

S se

al g

lass

from

con

tam

inat

ion,

the

shut

ter i

s cl

osed

whi

le R

OS n

ot in

ope

ratio

n.a.

At p

ower

on

and

with

inte

rlock

clo

sed,

ROS

Shu

tter C

lose

istu

rned

on

to c

lose

the

shut

ter.

b. 5

00m

s be

fore

ROS

Writ

e st

arts

ear

liest

for o

ne o

f the

four

col

ors

ROS

shut

ter O

pen

is tu

rned

on

to o

pen

the

shut

ter.

c. W

hen

ROS

Writ

e en

ds la

test

for o

ne o

f the

four

col

ors,

ROS

Shut

ter C

lose

is tu

rned

on

to c

lose

the

shut

ter.

d. In

Sta

ndby

Mod

e th

e sh

utte

r sta

ys c

lose

d. H

owev

er, w

ith p

ower

off o

r Int

erlo

ck o

pen

whi

le a

job

in p

rogr

ess,

the

shut

ter s

tays

ope

n.

1

NOTE

:

ROS

SHUT

TER

MOT

ORPL

8.1

7750

-275

ZONE G2

Page 367: Phaser 7750 Service Manual

10-43

Color Registration Control

9

5 8

2 1 10

SIDE

-A

LED

PD

SIDE

-B

LED

PD

MOB

SEN

SOR

2 PL

1.3

9

5 8

2 1 10

SIDE

-A

LED

PD

SIDE

-B

LED

PD

MOB

SEN

SOR

1 PL

1.3

2

1 2

2

1

1

6.12

C

6.12

C

6.11

COL

OR R

EGIS

TRAT

ION

CONT

ROL

MCU

PW

BPL

13.1

A219 12 11 20

2 9 10 1

A9 A10

A12

A19

A20

A11

9 2 1 10

12 19 20 11

A1

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

+5VD

C

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

MOB

SEN

SOR

1LE

D-B

ON S

IGNA

L

MOB

SEN

SOR

2LE

D-A

ON S

IGNA

L

MOB

SEN

SOR

2LE

D-B

ON S

IGNA

L

MOB

SEN

SOR

1LE

D-A

ON S

IGNA

LJ4

03P6

08J6

08J1

16

J117

J117

YEL

YEL

YEL

YEL

YEL

YEL YE

L

YEL

VIO

VIO

GRY

GRY

J116

J608

J403

P608

13A1

3

A16

A3A6

16

85

36

1815

DOUB

LEPL

UGM

OB S

ENSO

R 1-

ADE

TECT

ED (L

) +5V

DC

MOB

SEN

SOR

1-B

DETE

CTED

(L) +

5VDC

MOB

SEN

SOR

2-A

DETE

CTED

(L) +

5VDC

MOB

SEN

SOR

2-B

DETE

CTED

(L) +

5VDC

MOB

SEN

SOR

2DE

TECT

ED S

IGNA

L

MOB

SEN

SOR

1DE

TECT

ED S

IGNA

L

BLU

BLU

BLU

BLU

+5VD

C

+5VD

C

+5VD

C

+5VD

C

MCU

PW

BPL

13.1

Virtu

al Li

ne.

At R

OS W

rite,

cor

rect

ions

are

mad

e to

the

follo

wing

acc

ordi

ng to

col

orm

isreg

i qty

det

ecte

d by

MOB

Sen

sor.

a. F

ast S

can

Writ

e Lo

catio

n (W

rite

Star

t Pixe

l#. V

ideo

Clo

ck P

hase

)Al

l the

Zoo

m R

atio

s (V

ideo

Clo

ck F

requ

ency

)M

agni

ficat

ion

Balan

ce (V

ideo

Clo

ck S

weep

Qty

)b.

Slo

w Sc

anW

rite

Loca

tion

(Writ

e St

art L

ine

#)

NOTE

S:

7750

-276

9.20

9.21

9.22

9.23

TRAN

SFER

RED

REGI

CON

PATC

H (Y

)TO

IBT

TRAN

SFER

RED

REGI

CON

PATC

H (M

)TO

IBT

TRAN

SFER

RED

REGI

CON

PATC

H (M

)TO

IBT

TRAN

SFER

RED

REGI

CON

PATC

H (K

)TO

IBT

Page 368: Phaser 7750 Service Manual

10-44 Phaser 7750 Printer Service Manual

Tray 2 Paper Size Sensing

1

2

I/F P

WB

PL9.

1

+3.3

VDC

+3.3

VDC

DC C

OM

DC C

OM

B10

B8

J536

J115

YEL

YEL

1 3

2

TRAY

2 P

APER

SIZ

E SE

NSOR

PL2.

1

S4S3

S2S1

J115

TRAY

2 P

APER

SIZE

SEM

SOR

SENS

ED S

IGNA

L

YEL

J536

B958

P/J4

10

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1

+3.3

VDC

PAPE

R SI

ZE S

ENSO

R

S4

S3

S2

S1

TRAY

2 P

APER

SIZE

SEN

SOR

SENS

ED S

IGNA

L7.

10A

1Pa

per s

ize is

sen

sed

acco

rdin

g to

vol

tage

cor

resp

ondi

ng to

com

bine

d re

sist

ance

of P

aper

Size

Sen

sor.

The

tabl

e sh

ows

pape

r size

s co

rres

pond

to th

eir r

espe

ctiv

e Sw

itch

ON/O

FF p

atte

rns

and

volta

ges.

2Vi

rtual

Lin

e

NOTE

S:

7750

-277

7.1

TRAY

2 P

APER

SIZ

E SE

NSIN

G

Page 369: Phaser 7750 Service Manual

10-45

Tray 3 Paper Size Sensing

2

1 3

2

TRAY

3 P

APER

SIZ

E SE

NSOR

PL15

.1/1

6.1

S4S3

S2S1

PAPE

R SI

ZE S

ENSO

R

S4

S3

S2

S1

7.10

A

1Pa

per s

ize is

sen

sed

acco

rdin

g to

vol

tage

cor

resp

ondi

ng to

com

bine

d re

sist

ance

of P

aper

Size

Sen

sor.

The

tabl

e sh

ows

pape

r size

s co

rres

pond

to th

eir r

espe

ctiv

e Sw

itch

ON/O

FF p

atte

rns

and

volta

ges.

2Vi

rtual

Lin

e

NOTE

S:

7750

-278

7.1

TRAY

3 P

APER

SIZ

E SE

NSIN

G

1

+5VD

C

+5VD

C

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

2 8

J546

TRAY

MOD

ULE

PWB

15.9

/16.

15J5

57

J546

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

5 9 7

YEL

YEL

GRY

VIO

J816SH

ORTI

NGW

IRE

(TTM

i Y

)

J816

TRAY

MOD

ULE

DETE

CT S

IGNA

L 1

TRAY

3 P

APER

SIZE

SEN

SOR

SENS

ED S

IGNA

L

TRAY

3 P

APER

SIZE

SEN

SOR

SENS

ED S

IGNA

L

Page 370: Phaser 7750 Service Manual

10-46 Phaser 7750 Printer Service Manual

Tray 4 Paper Size Sensing

1 3

2

TRAY

4 P

APER

SIZ

E SE

NSOR

PL16

.1

S4S3

S2S1

+5VD

C

DC C

OM

TRAY

MOD

ULE

PWB

PL16

.15

12 10VI

O

GRY

J548

+5VD

C

DC C

OM

J820

7.3

TRAY

4 P

APER

SIZ

E SE

NSIN

G

TRAY

4 P

APER

SIZE

SEN

SOR

SENS

ED S

IGNA

LJ8

20J5

48 YEL

11

+5VD

C

TRAY

MOD

ULE

PWB

PL16

.15

PAPE

R SI

ZE S

ENSO

R

S4

S3

S2

S1

1

2TR

AY 4

PAP

ERSI

ZE S

ENSO

RSE

NSED

SIG

NAL

7.10

A

1Pa

per s

ize is

sen

sed

acco

rdin

g to

vol

tage

cor

resp

ondi

ng to

com

bine

d re

sist

ance

of P

aper

Size

Sen

sor.

The

tabl

e sh

ows

pape

r size

s co

rres

pond

to th

eir r

espe

ctiv

e Sw

itch

ON/O

FF p

atte

rns

and

volta

ges.

2Vi

rtual

Lin

e

NOTE

S:

7750

-279

Page 371: Phaser 7750 Service Manual

10-47

Tray 5 Paper Size Sensing

1 3

2

TRAY

5 P

APER

SIZ

E SE

NSOR

PL16

.1

S4S3

S2S1

+5VD

C

DC C

OM

TRAY

MOD

ULE

PWB

PL16

.15

6 4VI

O

GRY

J548

+5VD

C

DC C

OM

J824

7.4

TRAY

5 P

APER

SIZ

E SE

NSIN

G

TRAY

5 P

APER

SIZE

SEN

SOR

SENS

ED S

IGNA

LJ8

24J5

48 YEL

5

+5VD

C

TRAY

MOD

ULE

PWB

PL16

.15

PAPE

R SI

ZE S

ENSO

R

S4

S3

S2

S1

1

2TR

AY 4

PAP

ERSI

ZE S

ENSO

RSE

NSED

SIG

NAL

7.10

A

1Pa

per s

ize is

sen

sed

acco

rdin

g to

vol

tage

cor

resp

ondi

ng to

com

bine

d re

sist

ance

of P

aper

Size

Sen

sor.

The

tabl

e sh

ows

pape

r size

s co

rres

pond

to th

eir r

espe

ctiv

e Sw

itch

ON/O

FF p

atte

rns

and

volta

ges.

2Vi

rtual

Lin

e

NOTE

S:

7750

-280

Page 372: Phaser 7750 Service Manual

10-48 Phaser 7750 Printer Service Manual

Paper Size Sensing Switch Table

Paper size is sensed according to voltage corresponding to combined resistance of the paper size sensor. The table shows paper sizes repective to their ON/OFF patterns and voltages.

Paper SizeS1

DC330 [007-104]

S2 DC330

[007-105]

S3 DC330

[007-106]

S4 DC330

[007-107]

Voltage J546-8

No Tray OFF OFF OFF OFF 4.66

A3 S OFF OFF OFF ON 4.33

11” x 17” OFF OFF ON OFF 4.01

8.5” x 13” S OFF OFF ON ON 3.69

OFF ON OFF OFF 3.38

B5 L16K L

OFF ON OFF ON 3.07

B5 S 8” x 10” S

OFF ON ON OFF 2.75

8.5” x 11” S OFF ON ON ON 2.44

ON OFF OFF OFF 2.15

B4 S 8K S

ON OFF OFF ON 1.83

A4 S ON OFF ON OFF 1.52

8.5” x S14” ON OFF ON ON 1.21

ON ON OFF OFF 0.91

A4 L ON ON OFF ON 0.60

8.5” x 11” L ON ON ON OFF 0.30

A5 S 5.5” x 8.5” S

ON ON ON ON 0.00

Page 373: Phaser 7750 Service Manual

10-49

Tray 2 Paper Stacking

3 12

TRAY

2 L

EVEL

SENS

ORPL

2.4

3 12

TRAY

2 L

EVEL

SENS

ORPL

2.4

7.5

TRAY

2 P

APER

STA

CKIN

G

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

10

DC C

OMDC

COM

DC C

OMDC

COM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

95969798A6 A5 A4 A3 A2 A1

+24V

DC

+24V

DC

+24V

DC

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

J532

P617

DC33

0 [0

08-0

01] (

FEED

)DC

330

[008

-002

](LI

FT-U

P)TR

AY 2

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

01] (

FEED

)DC

330

[008

-002

](LI

FT-U

P)TR

AY 2

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

01] (

FEED

)DC

330

[008

-002

] (LI

FT-U

P)TR

AY 2

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

01] (

FEED

)DC

330

[008

-002

] (LI

FT-U

P)TR

AY 2

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DOUB

LEPL

UG

76

85

94

103

112

121

1 2 3 4 5 6

ORN

ORN

MOT

J617

J205

TRAY

2FE

ED/L

IFT-

UPM

OTOR

PL2.

4

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

+5VD

C

A10

A12

A7 A9

BLU

BLU

BLU

BLU

J532

P617

J617

J108

J108

DOUB

LEPL

UG

DOUB

LEPL

UG3 1 6 4

10 12 7 9

VIO

VIO

GRY

GRY

J106

J106

J617

P617

J532

11 8

2 5

YEL

YEL

BLU

BLU

DC33

0 [0

07-1

16]

TRAY

2 L

EVEL

SEN

SOR

SENS

ED (H

) +3.

3VDC

DC33

0 [0

07-1

20]

TRAY

2 N

O PA

PER

SENS

ORSE

NSED

(H) +

3.3V

DC

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1

A11

A8

93 94

+3.3

VDC

+3.3

VDC

TRAY

2 L

EVEL

SENS

ORSE

NSED

SIG

NAL

TRAY

2 N

O LE

VEL

SENS

ORSE

NSED

SIG

NAL

7.10

B8.1

8.1

7.10

B

1 1

TRAY

2 S

TACK

EDPA

PER

1Vi

rtual

Lin

e

NOTE

:

P/J4

10

TRAY

2 F

EED

DRIV

E

7750

-281

OPER

ATOR

LOAD

ED

PAPE

R

Page 374: Phaser 7750 Service Manual

10-50 Phaser 7750 Printer Service Manual

Tray 3 Paper Stacking

3 12

TRAY

3 L

EVEL

SENS

ORPL

15.3

/16.

7

3 12

TRAY

3 N

O PA

PER

SENS

ORPL

15.3

/16.

7

7.6

TRAY

3 P

APER

STA

CKIN

G

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

DC C

OM

DC C

OM

DC C

OM

DC C

OM

6 5 4 3 2 1

+24V

DCTM

INTL

K

+24V

DC T

M IN

TLK

+24V

DC T

M IN

TLK

YEL

YEL

YEL

BLU

YEL

BLU

VIO

VIO

BLU

BLU

J547

P670

DC33

0 [0

08-0

03] (

FEED

)DC

330

[008

-004

] (LI

FT-U

P)TR

AY 3

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

03] (

FEED

)DC

330

[008

-004

] (LI

FT-U

P)TR

AY 3

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

03] (

FEED

)DC

330

[008

-004

] (LI

FT-U

P)TR

AY 3

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

03] (

FEED

)DC

330

[008

-004

] (LI

FT-U

P)TR

AY 3

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DOUB

LEPL

UG

76

85

94

103

112

121

1 2 3 4 5 6

ORN

ORN

MOT

J670

J827

TRAY

2FE

ED/L

IFT-

UPM

OTOR

PL15

.3/1

6.7

TRAY

MOD

ULE

PWB

PL15

.9/1

6.5

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

+5VD

C

10 12 7 9

VIO

GRY

VIO

GRY

J547

P670

J670

J815

J815

DOUB

LEPL

UG

DOUB

LEPL

UG3 1 6 4

10 12 7 9

VIO

VIO

GRY

GRY

J814

J814

J670

P670

J547

11 8

2 5

YEL

YEL

YEL

YEL

DC33

0 [0

07-1

17]

TRAY

3 L

EVEL

SEN

SOR

SENS

ED (H

) +5V

DC

DC33

0 [0

07-1

21]

TRAY

3 N

O PA

PER

SENS

ORSE

NSED

(H) +

5VDC

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

11 8

+3.3

VDC

+3.3

VDC

TRAY

3 L

EVEL

SENS

ORSE

NSED

SIG

NAL

TRAY

3 N

O LE

VEL

SENS

ORSE

NSED

SIG

NAL

7.10

B

8.1

8.1

7.10

B

1 1

TRAY

3 S

TACK

EDPA

PER

1Vi

rtual

Line

NOTE

:

TRAY

3 F

EED

DRIV

E

7750

-282

OPER

ATOR

LOAD

ED

PAPE

R

Page 375: Phaser 7750 Service Manual

10-51

Tray 4 Paper Stacking

3 12

TRAY

4 L

EVEL

SENS

ORPL

15.5

/16.

9

TRAY

4 N

O PA

PER

SENS

ORPL

15.5

/16.

9

3 12

7.7

TRAY

4 P

APER

STA

CKIN

G

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

DC C

OM

DC C

OM

DC C

OM

DC C

OM

B6 B5 B4 B3 B2 B1

+24V

DCTM

INTL

K

+24V

DC T

M IN

TLK

+24V

DC T

M IN

TLK

YEL

YEL

YEL

BLU

YEL

BLU

VIO

VIO

BLU

BLU

J549

P672

DC33

0 [0

08-0

05] (

FEED

)DC

330

[008

-006

] (LI

FT-U

P)TR

AY 4

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

05] (

FEED

)DC

330

[008

-006

] (LI

FT-U

P)TR

AY 4

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

05] (

FEED

)DC

330

[008

-006

] (LI

FT-U

P)TR

AY 4

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DC33

0 [0

08-0

05] (

FEED

)DC

330

[008

-006

] (LI

FT-U

P)TR

AY 4

FEE

D/LI

FT-U

PM

OTOR

ON

24V

CLOC

K

DOUB

LEPL

UG

76

85

94

103

112

121

1 2 3 4 5 6

ORN

ORN

MOT

J672

J828

TRAY

4

FEED

/LIF

T-UP

MOT

ORPL

15.5

/16.

9

TRAY

MOD

ULE

PWB

PL15

.9/1

6.5

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

+5VD

C

B10

B12

B7 B9

VIO

GRY

VIO

GRY

J549

P672

J672

J819

J819

DOUB

LEPL

UG

DOUB

LEPL

UG3 1 6 4

10 12 7 9

VIO

VIO

GRY

GRY

J818

J818

J672

P672

J549

11 8

2 5

YEL

YEL

YEL

YEL

DC33

0 [0

07-1

18]

TRAY

4 L

EVEL

SEN

SOR

SENS

ED (H

) +5V

DC

DC33

0 [0

07-1

22]

TRAY

4 N

O PA

PER

SENS

ORSE

NSED

(H) +

5VDC

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

B11

B8

+5VD

C

+5VD

CTR

AY 4

LEV

ELSE

NSOR

SENS

ED S

IGNA

L

TRAY

4 N

O LE

VEL

SENS

ORSE

NSED

SIG

NAL

7.10

B

8.1

8.1 7.

10B

1 1

TRAY

4 S

TACK

EDPA

PER

1Vi

rtual

Line

NOTE

:

TRAY

4 F

EED

DRIV

E

7750

-283

OPER

ATOR

LOAD

ED

PAPE

R

Page 376: Phaser 7750 Service Manual

10-52 Phaser 7750 Printer Service Manual

Tray 5 Paper Stacking

OPER

ATOR

LOAD

ED

PAPE

R

3 12

TRAY

5 L

EVEL

SENS

ORPL

15.7

/16.

11

TRAY

5 N

O PA

PER

SENS

ORPL

15.7

/16.

11

3 12

7.8

TRAY

5 P

APER

STA

CKIN

G

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

DC C

OM

DC C

OM

DC C

OM

DC C

OM

A6 A5 A4 A3 A2 A1

+24V

DCTM

INTL

K

+24V

DC T

M IN

TLK

+24V

DC T

M IN

TLK

YEL

YEL

YEL

BLU

YEL

BLU

VIO

VIO

BLU

BLU

J549

P674

DC33

0 [0

08-0

07] (

FEED

)DC

330

[008

-008

] (LI

FT-U

P)TR

AY 5

FEED

/LIF

T-UP

MOT

OR O

N 24

V CL

OCK

DC33

0 [0

08-0

07] (

FEED

)DC

330

[008

-008

] (LI

FT-U

P)TR

AY 5

FEED

/LIF

T-UP

MOT

OR O

N 24

V CL

OCK

DC33

0 [0

08-0

07] (

FEED

)DC

330

[008

-008

] (LI

FT-U

P)TR

AY 5

FEED

/LIF

T-UP

MOT

OR O

N 24

V CL

OCK

DC33

0 [0

08-0

07] (

FEED

)DC

330

[008

-008

] (LI

FT-U

P)TR

AY 5

FEED

/LIF

T-UP

MOT

OR O

N 24

V CL

OCK

DOUB

LEPL

UG

76

85

94

103

112

121

1 2 3 4 5 6

ORN

ORN

MOT

J674

J829

TRAY

5

FEED

/LIF

T-UP

MOT

ORPL

15.7

/16.

11

TRAY

MOD

ULE

PWB

PL15

.9/1

6.5

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

+5VD

C

A10

A12

A7 A9

VIO

GRY

VIO

GRY

J549

P674

J674

J822

J822

DOUB

LEPL

UG

DOUB

LEPL

UG3 1 6 4

10 12 7 9

VIO

VIO

GRY

GRY

J823

J823

J674

P674

J549

11 8

2 5

YEL

YEL

YEL

YEL

DC33

0 [0

07-1

19]

TRAY

5 L

EVEL

SEN

SOR

SENS

ED (H

) +5V

DC

DC33

0 [0

07-1

23]

TRAY

5 N

O PA

PER

SENS

ORSE

NSED

(H) +

5VDC

TRAY

MOD

ULE

PWB

PL15

.9/1

6.15

A11

A8

+5VD

C

+5VD

CTR

AY 5

LEV

ELSE

NSOR

SENS

ED S

IGNA

L

TRAY

5 N

O LE

VEL

SENS

ORSE

NSED

SIG

NAL

7.10

B

8.1

8.1 7.

10B

1 1

TRAY

5 S

TACK

EDPA

PER

1Vi

rtual

Line

NOTE

:

TRAY

5 FE

ED D

RIVE

7750

-284

Page 377: Phaser 7750 Service Manual

10-53

Tray 1/MPT Paper Stacking

DC CO

M

DC CO

M

DC CO

M

+3.3V

DC

+3.3V

DC

+5VD

C

+5VD

C

J532

P610

J610

J103

J265

P265

P265

J265

J610

P610

J532

DC14

0 [00

7-100

]MS

I PAP

ER SI

ZESE

NSOR

SENS

EDSIG

NAL

DC33

0 [00

7-125

]MS

I NO P

APER

SENS

OR SE

NSED

(H) +3

.3VDC

B3 B15 B8 B10

I/F PW

BPL

9.1

YEL

DOUB

LEPL

UGDO

UBLE

PLUG

DOUB

LEPL

UGDO

UBLE

PLUG

YEL

YEL

YEL

8 6 3 1863

13

22

2 7

7 2

31

1GR

Y

GRY

VIO VIO

PAPE

RSIZ

ESE

NSOR

PL2.1

5

YEL

YEL

J103

OPER

ATOR

LOAD

ED PA

PER

7.9 TR

AY 5

PAPE

R STA

CKING

YEL

YEL

I/F PW

BPL

9.1MC

U PWB

PL13

.1

B4 B9

34P/J41

0

37

+3.3V

DC

+3.3V

DC

1

2Pa

per Si

zeSe

nsor S

ensed

Signal 2

No Pa

perSe

nsor S

ensed

Signal ST

ACKE

DPA

PER

7.10B

7.10B 8.1

TRAY

5 NO

PAPE

RSE

NSOR

PL2.1

33 1

2

Paper

width

(size

in Fa

st Sc

an dir

ection

) is se

nsed a

ccordi

ng to

voltag

e corr

espon

ding t

o resi

stance

of M

SI Pa

per Si

zeSe

nsor. T

he tab

le sho

ws pa

per siz

es (w

idths)

corre

spond

to th

eir re

spectiv

e volt

ages.

NOTE

:

1 2Vir

tual L

ine

7750

-285

7750

-285

Page 378: Phaser 7750 Service Manual

10-54 Phaser 7750 Printer Service Manual

Paper Feeding

45

54

12

21

4.1B 7.9

7.5

7.5

7.6

7.6

7.7

7.7

7.8

7.8

8.1

TRAY

1- 5

PAP

ER F

EEDI

NG

MCU

PW

BPL

13.1 CO

NTRO

LLO

GIC

DC C

OM

I/F P

WB

PL9.

1P/

J410

36B7 B6

+24V

DC

+24V

DC

J532

DC30

0 [0

07-0

03]

TRAY

5 F

EED

SOLE

NOID

ON (L

) +24

VDC

P610

YEL

YEL

DOUB

LEPL

UGDO

UBLE

PLUG

J610 OR

N

BLU

P219

J219

TRAY

5FE

EDSO

LENO

IDPL

2.14

A

A

TRAY

5 F

EED

DRIV

E

TRAY

5 S

TACK

EDPA

PER

TRAY

1 F

EED

DRIV

E

TRAY

1 S

TACK

EDPA

PER

TRAY

2 F

EED

DRIV

E

TRAY

2 S

TACK

EDPA

PER

TRAY

3 F

EED

DRIV

E

TRAY

4 FE

ED D

RIVE

TRAY

3 S

TACK

EDPA

PER

TRAY

4 ST

ACKE

DPA

PER

8.5

8.2

TRAY

5 F

ED P

APER

TRAY

1 F

ED P

APER

8.3

TRAY

2 F

ED P

APER

8.3

TRAY

3 F

ED P

APER

8.3

TRAY

4 F

ED P

APER

7750

-286

Page 379: Phaser 7750 Service Manual

10-55

Paper Transportation

3 12

TRAY

1 F

EED

OUT

SENS

ORPL

2.3

A

3 12

LH L

OWER

COV

ERIN

TERL

OCK

SENS

ORPL

2.3

A

A

4.1B 8.1 8.

3

8.6 8.

5 8.6

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

+5VD

C

+5VD

C

J536

P623

YEL

YEL

B5 B7

8.2

IOT

PAPE

R TR

ANSP

ORTA

TION

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

J623

VIO

J150

GRY

J150

J623

P623

3 1

1 3YE

LYE

L2

2

DC33

0 [0

08-1

00]

TRAY

1 F

EED

OUT

SENS

OR S

ENSE

D(H

) +5V

DCJ5

36B6

55

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1 +5VD

C

P/J4

10

1 TRAY

1 F

EED

OUT

SENS

ORSE

NSED

SIG

NAL

TRAY

FED

PAPE

R

TAKE

AW

AYCL

UTCH

PL1.

2P2

21

DC33

0 [0

08-0

38] (

400m

s)TA

KE A

WAY

CLU

TCH

ON (L

) +24

VDC

BLU

BLU

J532

J221

+24V

DC

1 2

2 1

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1P/

J410

DC C

OM

+24V

DC

92A1

5

A14

TAKE

AW

AYRO

LL 1

DRI

VE

TRAY

1 F

EDPA

PER

TRAY

MOD

ULE

FED

PAPE

R

MCU

PW

BPL

13.1

DC C

OM

+5VD

C

+5VD

C

J407

B12

B14

DC C

OM

YEL

YEL

J125

J125

DC33

0 [0

01-3

02LH

LOW

ER C

OVER

INTE

RLOC

K SE

NSOR

CLOS

ED (H

) +3.

3VDC

YEL

J407

B13M

CU P

WB

PL13

.1

+3.3

VDC

LH L

OWER

COV

ERIN

TERL

OCK

SENS

ORSE

NSED

SIG

NAL

1

1NOTE

: Virtu

al Li

ne77

50-2

87

Page 380: Phaser 7750 Service Manual

10-56 Phaser 7750 Printer Service Manual

Tray Module Paper Transportation

22

22

22

J546

DC C

OMP8

40

DOUB

LEPL

UGJ8

40J8

30

VIO

VIO

+5VD

C

GRY

GRY

3

31

1

J548

DC C

OMP8

41

DOUB

LEPL

UGJ8

41J8

21

VIO

VIO

+5VD

C

GRY

GRY

3

31

1

DC C

OM

P842

DOUB

LEPL

UGJ8

42J8

25

GRY

GRY

+5VD

C

VIO

VIO

1

13

3

10 12 7 9 3 1

3 12

TAKE

AW

AY S

ENSO

RPL

16.6

A

3 12

1 3

2

TRAY

3 F

EED

OUT

SENS

ORPL

16.6

TRAY

4 F

EED

OUT

SENS

ORPL

16.5

B C

8.6

8.6

8.6

8.2

8.4

8.4

8.4

8.1

8.1

8.1

A B

C

TAKE

AW

AYRO

LL 2

DRI

VE

TRAY

2 F

EDPA

PER

TRAY

3 FE

DPA

PER

TRAY

34 F

EDPA

PER

TAKE

AW

AYRO

LL 3

DRI

VE

TAKE

AW

AYRO

LL 4

DRI

VE

TRAY

MOD

ULE

PWB

PL16

.15

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

8.3

TRAY

MOD

ULE

PAPE

R TR

ANSP

ORTA

TION

J830 J831

J825

YEL

YEL

YEL

YEL

YEL

YEL

J840

J841

J842

P840

P841

9842

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

DC33

0 [0

08-1

06]

TAKE

AW

AY S

ENSO

RSE

NSED

(H) +

5VDC

DC33

0 [0

08-1

02]

TRAY

3 F

EED

OUT

SENS

ORSE

NSED

(H) +

5VDC

DC33

0 [0

08-1

03]

TRAY

4 F

EED

OUT

SENS

ORSE

NSED

(L) +

5VDC

J546

J548

TRAY

MOD

ULE

PWB

PL16

.15

+5VD

C

+5VD

C

+5VD

C

11 8 2

1

1

1 1

TAKE

AW

AYSE

NSOR

SENS

ED S

IGNA

L

TRAY

3 F

EED

OUT

SENS

ORSE

NSED

SIG

NAL

TRAY

4 F

EED

OUT

SENS

ORSE

NSED

SIG

NAL

TRAY

MOD

ULE

FED

PAPE

R

7750

-288

NOTE

:

Virtu

al L

ine

Page 381: Phaser 7750 Service Manual

10-57

Tray Module Paper Transport Drive Control

8.4

TRAY

MOD

ULE

PAPE

R TR

ANSP

ORT

DRIV

E CO

NTRO

L

TRAY

MOD

ULE

PWB

PL16

.15

CD C

OM

CD C

OM

CD C

OM

CD C

OM

CD C

OM

CD C

OM

CD C

OM

CD C

OM

+24V

DCTM

INTL

K

+24V

DCTM

INTL

K

J552

TAKE

AW

AY M

OTOR

1ON

24V

CLO

CK

1

TAKE

AW

AY M

OTOR

1ON

24V

CLO

CK

1

TAKE

AW

AY M

OTOR

1ON

24V

CLO

CK

1

YEL

YEL

YEL

TAKE

AW

AY M

OTOR

1ON

24V

CLO

CK

1

YEL

+24V

DC T

M IN

TLK

+24V

DC T

M IN

TLK

VIO

VIO

TAKE

AW

AY M

OTOR

2ON

24V

CLO

CK

1

TAKE

AW

AY M

OTOR

2ON

24V

CLO

CK

1

TAKE

AW

AY M

OTOR

2ON

24V

CLO

CK

1

TAKE

AW

AY M

OTOR

2ON

24V

CLO

CK

1

+24V

DC T

M IN

TLK

+24V

DC T

M IN

TLK

6 5 4 3 2 1 6 5 4 3 2 1

J533

DOUB

LEPL

UGP8

26J8

267

1 2 3 4 5 6

6 5 4 3 2

TAKW

AW

AYM

OTOR

1PL

16.1

5

TAKW

AW

AYM

OTOR

2PL

16.1

5MOT MOT

8.3

8.3

8.3

TAKE

AW

AYRO

LL 2

DRI

VE

TAKE

AW

AYRO

LL 3

DRI

VE

TAKE

AW

AYRO

LL 4

DRI

VE

7750

-289

Page 382: Phaser 7750 Service Manual

10-58 Phaser 7750 Printer Service Manual

Registration

13

2

OHP

SENS

OR R

PL2.

6

B

13

2

REGI

SEN

SOR

PL2.

6

A

1

22

8.6

8.6

9.24

B

4.1B

10.5

8.1

8.2

8.5

REGI

STRA

TION

MCU

PW

BPL

13.1

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

CDC

COM

DC C

OM

+5VD

C

B9 B11

B1 B3

J407

P620

YEL

YEL

YEL

3 1 11

9 11 1 3

VIO

VIO

GRY

GRY

J155

J620

DOUB

LEPL

UGJ1

09

J155

YEL

YEL

YEL

YEL

J109

J620

P620

DOUB

LEPL

UG

10

102

2

DC33

0 [0

08-1

04]

REGI

SEN

SOR

SENS

ED (L

) +3.

3VDC

J407

DC33

0 [0

08-1

10]

OHP

SENS

OR R

SENS

ED (L

) +5V

DC

MCU

PW

BPL

13.1

+3.3

VDC

+5VD

C

REGI

SEN

SOR

SENS

ED S

IGNA

L

OHP

SENS

OR R

SENS

ED S

IGNA

L

REGI

STRA

TED

PAPE

R

MCU

PW

BPL

13.1

DC C

OM

+24V

DC

B7 B8

REGI

ROL

LDR

IVE

J407

DC33

0 [0

08-0

37] (

400m

s)RE

GI C

LUTC

HON

(L) +

24VD

CYE

L

YEL+2

4VDC

DOUB

LEPL

UGP6

20J6

20J2

31

BLU

ORN

REGI

CLU

TCH

PL2.

6

DULE

X OU

TCO

PY

MSI

FED

PAPE

R

TRAY

FED

PAPE

R

1 2

Pape

r typ

e is

sens

ed b

y ho

w OH

P Se

nsor

R o

pera

tes

for 1

20m

sec

from

Regi

Sen

sor O

N an

d 10

0mse

c af

ter R

egi s

tarts

. If a

ny o

ther

than

the

com

bina

tions

sho

wn a

t rig

ht is

det

eted

, the

ope

ratio

n st

ops.

NOTE

: Virtu

al Li

ne

7750

-290

Page 383: Phaser 7750 Service Manual

10-59

Drum Drive Control

MOT FG

3

1

2 2 2

DC C

OM

DC C

OM

DC C

OM

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

1022

B5 B3 B2 B6 B7 B9 B8

20 19

+5VD

C

+5VD

C

DC C

OM

+24V

DCIN

TLK

DC C

OM

DC33

0 [0

04-0

03]

DRUM

MOT

OR (Y

,M,C

)ON

(L) +

5VDC

DC33

0 [0

04-1

01]

DRUM

MOT

OR (Y

,M,C

)FA

IL (H

) +3.

3VDC

DRUM

MOT

OR (Y

,M,C

)PL

1.1

DC33

0 [0

04-0

03]

DRUM

MOT

OR H

IGH

SPEE

D (L

) +5V

DC

DC33

0 [0

04-0

03]

DRUM

MOT

ORRE

F CLO

CK +

5VDC

J535

J210

BLU

BLU

BLU

GRY

DC C

OM

+24V

DC IN

TLK

VIO

ORN

VIO

DC C

OM

1 2 3 4 5 6 7

8SE

RVO

CONT

ROL

J210

J535

BLU

B1

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1+3

.3VD

C

18P/

J410

4 DRUM

MOT

OR(Y

,M,C

)FA

IL S

IGNA

L9.

31A

9.5

9.6

9.7

NOTE

S:

Drive

s at h

igh

spee

d fo

r sta

ndar

d pa

per a

nd at

half

spee

d fo

r OHP

film

.

Rem

ove a

ll the

dru

ms b

efor

e tur

ning

on

DC30

0 {0

04-0

03].

Turn

ing

on

Dr

um M

otor

s with

the d

rum

s ins

talle

d m

ay d

amag

e the

Dru

m b

lades

each

.

Turn

ing

on D

C300

[004

-003

] allo

ws th

e Dru

m M

otor

s to

rota

te at

nor

mal

(hig

h) sp

eed

and

DC30

0 [0

04-0

11] a

t half

spee

d.

The r

otat

ion

spee

d is

cont

rolle

d co

mpa

red

with

the i

nten

al clo

ck

Virtu

al Li

ne

1 2 3 49.1

DRUM

DRI

VE C

ONTR

OL (Y

,M,C

)

A B C

DRUM

(Y) D

RIVE

DRUM

(M) D

RIVE

DRUM

(C) D

RIVE

7750

-291

Page 384: Phaser 7750 Service Manual

10-60 Phaser 7750 Printer Service Manual

Drum Drive Control K

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

10A1

1

A10

A9 A8 A12

A13

A15

A14

+5VD

C

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+24V

DCIN

TLK

DC C

OM

1

2 2 2 2

3

TD 1

TD 1

MOT FG

A7

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1

+3.3

VDC

47P/

J410

4 DRUM

MOT

OR (K

)FA

IL S

IGNA

L9.

31A

9.8

43 44 45 46

J534

J235

J235

DC33

0 [0

04-0

06]

DRUM

MOT

OR (K

)ON

(L) +

5VDC

DC33

0 [0

04-0

06]

DRUM

MOT

OR (K

)RE

F CLO

CK (L

) +5V

DC

DC33

0 [0

04-0

06]

DRUM

MOT

OR (K

)HI

GH S

PEED

(L) +

5VDC

DC33

0 [0

04-0

06]

DRUM

MOT

OR (K

)HI

GH S

PEED

(L) +

5VDC

BLU

BLU

BLU

BLU

BLU

BLU

GRY

VIO

ORN

VIO

DRUM

MOT

OR (K

)PL

1.1 SE

RVO

CONT

ROL

DC33

0[00

4-10

2]DR

UM M

OTOR

(K)

FAIL

(H) +

3.3V

DCJ5

349

5 6 7 8 4 3 1 2

DRUM

(K)

DRIV

E

9.2

DRUM

DRI

VE C

ONTR

OL (K

)

NOTE

S:

Drive

s at h

igh

spee

d fo

r sta

ndar

d pa

per a

nd at

half

spee

d fo

r OHP

film

.

Rem

ove D

rum

K b

efor

e tur

ning

on

DC30

0 {0

04-0

06].

Turn

ing

on

Dr

um M

otor

s with

the d

rum

inst

alled

may

dam

age t

he D

rum

blad

e.

Tu

rnin

g on

DC3

00 [0

04-0

06] a

llows

the D

rum

Mot

ors t

o ro

tate

at n

orm

al

(h

igh)

spee

d an

d DC

300

[004

-009

] at h

alf sp

eed,

and

DC33

0 [0

04-0

10] a

t

do

uble

spee

d.

The r

otat

ion

spee

d is

cont

rolle

d co

mpa

red

with

the i

nten

al clo

ck.

Virtu

al Li

ne

1 2 3 4

Test

Poi

nt M

CU P

WB

J407

-B3(

+) to

GND

(-).

A fre

quen

cy o

f app

rox.

1.28

5KHz

.

7750

-292

Page 385: Phaser 7750 Service Manual

10-61

Drum Life Control

DRUM

(K)

PL4.

1

CRUM

4 3 22

1

3

DRUM

(C)

PL4.

1

CRUM

4 3 22

1

MCU

PW

BPL

13.1

+3.3

VDC

+3.3

VDC

+3.3

VDC

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

A8 A7 A6 A5 A4 A3 A2 A1

YEL

YEL

YEL

YEL

YEL

YEL

YEL

YEL

YEL

YEL

YEL

VIO

YEL

YEL

YEL

VIO

J405

P622

DC33

0[00

9-03

5]DR

UM (K

) POW

ERON

(H) +

3.3V

DC

DC33

0[00

9-03

5]DR

UM (C

) POW

ERON

(H) +

3.3V

DC

DC33

0[00

9-15

3]DR

UM (C

) DAT

A

DRUM

(K)

+3.3

VDC

CLOC

K

DRUM

(C)

+3.3

VDC

CLOC

K

DC33

0[00

9-15

4]DR

UM (K

) DAT

A1 1

1 2 3

DOUB

LEPL

UGJ6

22J1

531

10 9 8 7 6 5 4 3

2 3 4 5 6 7 8

J152

DRUM

(K) D

ATA

SIGN

AL9.

31B

3DR

UM (C

) DAT

ASI

GNAL

9.31

B

NOTE

:

DC

330

[009

-153

] & [0

09-1

54]:

Drum

Det

ect

W

ith D

rum

inst

alle

d pr

oper

ly, h

igh

is d

ispl

ayed

. How

ever

, no

prop

er

disp

lay

appe

ars

for D

rum

Car

tridg

e in

stal

led

at fa

ctor

y sh

ipm

ent.

Dr

um C

artri

dge

inst

alle

d at

fact

ory

ship

men

t has

no

Crum

. The

life

of t

he

drum

car

tridg

e is

con

trolle

d ba

sed

on d

ata

in M

/C N

VM.

Vi

rtual

Lin

e77

50-2

94

9.4

DRUM

LIF

E CO

NTRO

L (C

,K)

Page 386: Phaser 7750 Service Manual

10-62 Phaser 7750 Printer Service Manual

Charge and Exposure (Y as an Example)

9.1

9.26

6.5B

6.5B

6.5B

9.26

9.10

9.10

9.10

DRUM

(Y) D

RIVE

CLEA

NED

DRUM

(Y)

LASE

R SC

ANNE

DIM

AGE

(Y)

LASE

R SC

ANNE

DAD

C PA

TCH

(Y)

LASE

R SC

ANNE

DRE

GICO

N PA

TCH

(Y)

I/F P

WB

PL9.

1

DC C

OM

+24V

DCIN

TLK

4 3 2 1

J553

DC C

OMDC

COM

DC C

OMDC

COM

J501

VIO

VIO

BLU

VIO

ORN

ORN+2

4VDC

INTL

K+2

4VDC

INTL

K

+24V

DCIN

TLK

+24V

DC IN

TLK

1010

11

1112 13

1

4 4

1 2

2 3

HVPS

CON

TROL

PWB

PL9.

1HV

PS T

5PL

9.1

P/J5

71 9 2 1

1 8 9

J572

DC33

0 [0

09-0

39]

BCR

CLOC

KJ5

73

YEL

YEL

YEL

DC14

0 [0

09-0

26]

BCR

(Y) A

C RE

MOT

E

DC14

0 [0

09-0

26]

BCR

(Y) A

C RE

MOT

E

HVPS

T7

PL9.

1

AC F

REQU

ENCY

AND

DUTY

CONT

ROL

BCR

(Y)

POW

ERCO

NTRO

L

CAUT

ION

HIGH

VOLT

AGE

1 8

8

9 10 11

J581

BCR

(Y) P

OWER

ZONE D4

CLEA

NER

(Y)

DRIV

E

LATE

NT IM

AGE

(Y)

LATE

NTAD

C PA

TCH

(Y)

LATE

NT R

EGIC

ONPA

TCH

(Y)

9.5

CHAR

GING

AND

EXP

OSUR

E (Y

) ZONE H2

BCR

(Y) P

OWER

HVPS

Con

trol P

WB

perfo

rms

BCR

on/o

ff co

ntro

l and

rem

ote

cont

rol b

yco

nduc

ting

seria

l com

mun

icat

ions

with

MCU

PW

B.Fo

r the

wiri

ng b

etw

een

MCU

PW

B an

d HV

PS C

ontro

l PW

B, s

ee C

H 3.

1B

User

s DC

and

AC,

sup

erim

posi

ng th

em o

n ea

ch o

ther

in F

ull C

olor

mod

e,an

d DC

in B

/W m

ode

for c

harg

e.

With

wea

r of i

t, th

e ch

argi

ng c

apab

ility

of D

rum

P/R

var

ies.

The

DC

elem

ent

with

whi

ch B

CR is

cha

rged

ia c

orre

cted

acc

ordi

ng to

val

ue re

ad b

y En

viro

men

tSe

nsor

and

Dru

m C

ycle

Qty

in e

ach

of fu

ll Co

lor a

nd B

/W m

ode,

whi

ch q

ty is

read

from

Dru

m C

rum

.

Turn

ing

on D

C140

[009

-026

] ena

bles

BCR

for e

very

col

or, D

eve

Bias

for e

very

colo

r, M

ain

Mot

or, D

rum

Mot

ors

and

Deve

Mot

or to

ope

rate

sim

ulta

neou

sly.

3 4

7750

-295

NOTE

S:

Page 387: Phaser 7750 Service Manual

10-63

Deve Drive Control

1

1 2 3

2 2

9.9

DEVE

DRI

VE C

ONTR

OL

MCU

PW

BPL

13.1

DC C

OM

DC C

OM

I/F P

WB

PL9.

1

P/J4

1048 49

A6 A5 A3 A4 A2 A1

=5VD

C

=5VD

CDC

COM

DC C

OM

DC C

OM

DC C

OM

+24V

DCIN

TLK

+24V

DC IN

TLK

BLU

BLU

ORN

VIO

VIO

GRY

J534

J232

DC 3

30 [0

09-0

14] (

5s)

DEVE

MOT

ORON

(L) +

5VDC

DC 3

30 [0

09-0

14] (

5s)

DEVE

MOT

ORHI

GH S

PEED

(L) +

5VDC

1 2 4 5 6 7

3

MOT FG

9.10

9.11

9.12

A B C

DEVE

(Y) D

RIVE

DEVE

(M) D

RIVE

DEVE

(C) D

RIVE

Drive

s at h

igh

spee

d fo

r sta

ndar

d pa

per a

nd at

half

spee

d fo

r thi

ck p

aper

and

OHP

film

.

Turn

ing

on D

C330

[009

-014

] allo

ws D

eve M

otor

to ro

tate

at n

orm

al(h

igh)

spee

d an

d DC

330

[009

-016

] at h

alf sp

eed

The r

otat

ion

spee

d is

cont

rolle

d co

mpa

red

with

the i

nter

nal c

lock

.

NOTE

S:

7750

-299

Page 388: Phaser 7750 Service Manual

10-64 Phaser 7750 Printer Service Manual

Development Y (As an Example)

9.159.9

DISP

ENSE

DYE

LLOW

TON

ER

9.5

LATE

NTIM

AGE

(Y)

9.5

LATE

NTAD

C PA

TCH

(Y)

9.5

LATE

NT R

EGIC

ONPA

TCH

(Y)

1

3 3 3 3 3

2

DEVE

BIA

S(Y

, M)

POW

ERCO

NTRO

L

CAUT

ION

HIGH

VOLT

AGE

5

6

1 2 3 4 5 6

9.20

9.20

9.20

9.29

9.31

9.10

DEV

ELOP

MEN

T (Y

)DE

VE (Y

) DRI

VE

HVPS

CON

TROL

PW

BPL

9.1

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

DC C

OMDC

COM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

MCU

PW

BPL

13.1

DC C

OM

+5VD

C

4 3 2 1

J553

VIO

VIO

ORN

ORN

J501

HVPS

T5

PL9.

1

P/J5

7124 25 26 27 28 18 20 19 10 11 12 13

P/J5

7015

,16,

17

B12

B14

J405 YE

L

YEL

DC C

OMP1

29

DC33

0 [0

09-0

80]

ATC

SENS

OR P

OWER

ON (H

) +5V

DC

DOUB

LEPL

UGDO

UBLE

PLUG

3 1

1 3

J129

ATC

SENS

OR (Y

)PL

6.2

4

J129

P129 YE

L2

2

DC14

0 [0

09-0

26]

DEVE

BIA

S (Y

,M)

AC R

EMOT

E 1

DC14

0 [0

09-0

26]

DEVE

BIA

S (Y

,M)

AC R

EMOT

E 2

DC14

0 [0

09-0

26]

DEVE

BIA

S (Y

)DC

REM

OTE

DC14

0 [0

09-0

26]

AC B

IAS

REM

OTE

2

DC14

0 [0

09-0

26]

AC B

IAS

REM

OTE

1

ANAL

OG G

ND

+5VD

C RE

F

AC B

IAS

VOLT

AGE

MON

ITOR

DEVE

BIA

S (Y

,M)

AC V

OLTA

GE M

ONIT

OR

J580

DISP

ENSE

DYE

LLOW

TON

ER

LATE

NTIM

AGE

(Y)

LATE

NTAD

C PA

TCH

(Y)

LATE

NT R

EGIC

ONPA

TCH

(Y)DE

VE B

IAS

(Y)

1

DC14

0 [0

09-1

00]

ATC

SENS

OR (Y

)SE

NSED

SIG

NAL

YEL

J405

B13M

CU P

WB

PL13

.1

ATC

SENS

OR (Y

)SE

NSED

SIG

NAL

HVPS

Con

trol P

WB

perfo

rms

Deve

Bia

s on

/off

cont

rol a

nd re

mot

eco

ntro

l by

cond

uctin

g se

rial c

omm

unic

atio

ns w

ith M

CU P

WB.

For t

he w

iring

bet

wee

n M

CU P

WB

and

HVPS

Con

trol P

WB,

see

CH

3.1B

AC B

ias

Rem

ote

1 an

d AC

Bia

s Re

mot

e 2

are

rem

ote

sign

als

for t

heco

nver

ter t

hat g

ener

ates

the

DC e

lem

ent.

Turn

ing

on D

C140

[009

-026

] allo

ws

BCR

for e

very

col

or, D

eve

Bias

for e

very

col

or, M

ain

Mot

or, D

rum

Mot

ors

and

Deve

Mot

or to

ope

rate

sim

ulta

neou

sly.

Whe

n re

plac

ing

Deve

Ass

y or

ATC

Sen

sor,

use

Refe

renc

e Va

lue

and

Gain

Valu

e sp

ecifi

ed o

n th

e la

bel o

f the

new

ATC

Sen

sor f

or D

C921

ATC

Sens

or S

etup

.

Dete

cts

Low

Ton

er a

nd T

oner

Em

pty

by A

TC S

enso

r-sen

sed

Tone

rCo

ncen

tratio

n in

Dev

e As

sy a

nd IC

DC C

ontro

l.

Virtu

al L

ine

NOTE

S:

7750

-300

DEVE

LOPE

DIM

AGE

(Y)

DEVE

LOPE

DAD

C PA

TCH

(Y)

DEVE

LOPE

DRE

GICO

NPA

TCH

(Y)

WAS

TETR

ICLE

(Y)

Page 389: Phaser 7750 Service Manual

10-65

Development K

9.15

4.1B

DISP

ENSE

DBL

ACK

TONE

R

9.8

LATE

NTIM

AGE

(K)

9.8

LATE

NTAD

C PA

TCH

(K)

9.8

LATE

NT R

EGIC

ONPA

TCH

(K)

1

3 3 3 3 3

2

DEVE

BIA

S(C

, K)

POW

ERCO

NTRO

L

CAUT

ION

HIGH

VOLT

AGE

5

6

1 2 3 4 5 6

9.13

A DE

VELO

PMEN

T (K

) (1

of 2

)

DEVE

(K) D

RIVE

HVPS

CON

TROL

PW

BPL

9.1

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

DC C

OMDC

COM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

MCU

PW

BPL

13.1

DC C

OM

+5VD

C

4 3 2 1

J553

VIO

VIO

ORN

ORN

J501

HVPS

T5

PL9.

1

P/J5

7115 16 26 27 31 18 20 10 10 11 12 13

P/J5

7015

,16,

17

A12

A14

J405 BL

U

BLU

DC C

OMP1

31

DC33

0 [0

09-0

80]

ATC

SENS

OR P

OWER

ON (H

) +5V

DC

DOUB

LEPL

UGDO

UBLE

PLUG

3 1

1 3

J132

ATC

SENS

OR (K

)PL

6.2

4

J132

P132

BLU

22

DC14

0 [0

09-0

26]

DEVE

BIA

S (C

AK

)AC

REM

OTE

1

DC14

0 [0

09-0

26]

DEVE

BIA

S (C

AK

)AC

REM

OTE

2

DC14

0 [0

09-0

26]

DEVE

BIA

S (K

)DC

REM

OTE

DC14

0 [0

09-0

26]

AC B

IAS

REM

OTE

2

DC14

0 [0

09-0

26]

AC B

IAS

REM

OTE

1

ANAL

OG G

ND

+5VD

C RE

F

AC B

IAS

VOLT

AGE

MON

ITOR

DEVE

BIA

S (C

AK

)AC

VOL

TAGE

MON

ITOR

J580

DISP

ENSE

DBL

ACK

TONE

R

LATE

NTIM

AGE

(K)

LATE

NTAD

C PA

TCH

(K)

LATE

NT R

EGIC

ONPA

TCH

(K)

DEVE

BIA

S (K

)

DEVE

(K) D

RIVE

7

DC14

0 [0

09-1

03]

ATC

SENS

OR (K

)SE

NSED

SIG

NAL

J405

A13M

CU P

WB

PL13

.1

ATC

SENS

OR (K

)SE

NSED

SIG

NAL

HVPS

Con

trol P

WB

perf

orm

s De

ve B

ias

on/o

ff co

ntro

l and

rem

ote

cont

rol b

y co

nduc

ting

seria

l com

mun

icat

ions

with

MCU

PW

B.Fo

r the

wiri

ng b

etw

een

MCU

PW

B an

d HV

PS C

ontro

l PW

B, s

ee C

H 3.

1B

AC B

ias

Rem

ote

1 an

d AC

Bia

s Re

mot

e 2

are

rem

ote

sign

als

for t

heco

nver

ter t

hat g

ener

ates

the

DC e

lem

ent.

Turn

ing

on D

C140

[009

-026

] allo

ws

BCR

for e

very

col

or, D

eve

Bias

for e

very

col

or, M

ain

Mot

or, D

rum

Mot

ors

and

Deve

Mot

or to

ope

rate

sim

ulta

neou

sly.

Whe

n re

plac

ing

Deve

Ass

y or

ATC

Sen

sor,

use

Refe

renc

e Va

lue

and

Gain

Valu

e sp

ecifi

ed o

n th

e la

bel o

f the

new

ATC

Sen

sor f

or D

C921

ATC

Sens

or S

etup

.

Dete

cts

Low

Ton

er a

nd T

oner

Em

pty

by A

TC S

enso

r-se

nsed

Ton

erCo

ncen

tratio

n in

Dev

e As

sy a

nd IC

DC C

ontro

l.

Virtu

al L

ine

NOTE

S:

7750

-303

A B C D E F

9.31

C

9.13

B

9.13

B

9.13

B

9.13

B

9.13

B

9.13

B

Page 390: Phaser 7750 Service Manual

10-66 Phaser 7750 Printer Service Manual

Development K (cont’d)

A B C D E F

9.23

9.23

9.23

9.29

MCU

PW

BPL

9.1

I/F P

WB

PL9.

1

DC C

OM

P/J4

10P/

J410

P/J4

1038

B12

B11

+24V

DC

+24V

DC

DC33

0 [0

09-0

13] (

5s)

DEVE

(K) C

LUTC

HON

(L) +

24VD

CJ5

32J2

34

YEL

YEL

1 2

2 1

P234

DEVE

(K)

CLUT

CHPL

1.2

DOUB

LEPL

UG

DEVE

BIA

S (K

)

DEVE

(K) D

RIVE

DISP

ENSE

DBL

ACK

TONE

R

LATE

NTIM

AGE

(K)

LATE

NTAD

C PA

TCH

(K)

LATE

NT R

EGIC

ONPA

TCH

(K)

9.13

A

9.13

A

9.13

A

9.13

A

9.13

A

9.13

A

DEVE

LOPE

DIM

AGE

(K)

DEVE

LOPE

DAD

C PA

TCH

(K)

DEVE

LOPE

DRE

GICO

NPA

TCH

(K)

WAS

TETR

ICKL

E (K

)

9.13

B DE

VELO

PMEN

T (K

) (2

of 2

)

7750

-304

Page 391: Phaser 7750 Service Manual

10-67

New Toner Cartridge Detection

NEW

CART

RIDG

EDE

TECT

SWIT

CH (M

)PL

6.1

1FS

182

FS18

3

YEL

YEL

NEW

CART

RIDG

EDE

TECT

SWIT

CH (Y

)PL

6.1

1FS

180

FS18

1

YEL

YEL

YEL

YEL

J163

P163

J163

DOUB

LEPL

UG

2 4

3 1

DOUB

LEPL

UG

4 2

1 3

DOUB

LEPL

UG

4 2

1 3

NEW

CART

RIDG

EDE

TECT

SWIT

CH (K

)PL

6.1

1

1 2

FS18

6FS

187

BLU

BLU

BLU

NEW

CART

RIDG

EDE

TECT

SWIT

CH (C

)PL

6.1

1FS

184

FS18

5

BLU

BLU

BLU

BLU

BLU

J165

J165

P165

DOUB

LEPL

UG

2 4

3 1

J405

DC33

0 [0

09-1

01]

NEW

CAR

TRID

GE D

ETEC

TSW

ITCH

(Y)

NEW

DET

ECT

(L) +

3.3V

DC

DC33

0 [0

09-1

02]

NEW

CAR

TRID

GE D

ETEC

TSW

ITCH

(M)

NEW

DET

ECT

(L) +

3.3V

DC

DC33

0 [0

09-1

03]

NEW

CAR

TRID

GE D

ETEC

TSW

ITCH

(C)

NEW

DET

ECT

(L) +

3.3V

DC

DC33

0 [0

09-1

04]

NEW

CAR

TRID

GE D

ETEC

TSW

ITCH

(K)

NEW

DET

ECT

(L) +

3.3V

DC

+3.3

VDC

+3.3

VDC

+3.3

VDC

+3.3

VDC

9.31

DNE

W C

ARTR

IDGE

DET

ECT

SWIT

CH S

IGNA

L Y

2

9.31

DNE

W C

ARTR

IDGE

DET

ECT

SWIT

CH S

IGNA

L M

2

9.31

DNE

W C

ARTR

IDGE

DET

ECT

SWIT

CH S

IGNA

L C

2

9.31

DNE

W C

ARTR

IDGE

DET

ECT

SWIT

CH S

IGNA

L K

2

MVU

PW

BPL

13.1

B18

B16

A16

A18

MCU

PWB

PL13

.1 DC C

OM

B17

B15

A15

A17

DC C

OM

DC C

OM

DC C

OM

YEL

YEL

J405

P163

P165

Dete

cts

Low

(New

) by

keep

ing

in c

onta

ct w

ith th

e m

etal

sur

face

at t

he re

ar o

f the

cartr

idge

for o

nly

a pe

riod

from

the

time

a ne

w c

artri

dge

is in

stal

led

until

it is

lock

ed.

Afte

r the

n th

e ci

rcui

t is

open

.

Virtu

al L

ine

9.14

NEW

TON

ER C

ARTR

IDGE

DET

ECTI

ON

7750

-305

Page 392: Phaser 7750 Service Manual

10-68 Phaser 7750 Printer Service Manual

Toner Dispense Control

+5VD

C

+5VD

C

+5VD

C

+5VD

CDC

COM

DC C

OM

DC C

OM

DC C

OM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

+24V

DCIN

TLK

+24V

DCIN

TLK

P/J4

1017 77 76 75

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

A1 A2 A3 A4 A5 A6 A7 A8

J533

J277

J228

J229

BLU

BLU

BLU

BLU

+24V

DC IN

TLK

BLU

BLU

J230

+24V

DC IN

TLK

BLU

BLU

TONE

RDI

SPEN

SEM

OTOR

(Y)

PL6.

1

2 1

MOT

TONE

RDI

SPEN

SEM

OTOR

(M)

PL6.

1

2 1

MOT

TONE

RDI

SPEN

SEM

OTOR

(C)

PL6.

1

2 1

MOT

TONE

RDI

SPEN

SEM

OTOR

(K)

PL6.

1

2 1

MOT

DC33

0 [0

09-0

01] (

5s)

TONE

R DI

SPEN

SEM

OTOR

(Y)

ON (L

) +24

VDC

2

DC33

0 [0

09-0

02] (

5s)

TONE

R DI

SPEN

SEM

OTOR

(M)

ON (L

) +24

VDC

2

DC33

0 [0

09-0

03] (

5s)

TONE

R DI

SPEN

SEM

OTOR

(C)

ON (L

) +24

VDC

2

DC33

0 [0

09-0

04] (

5s)

TONE

R DI

SPEN

SEM

OTOR

(K)

ON (L

) +24

VDC

2

12

19.

15 T

ONER

DIS

PENS

E CO

NTRO

L

DISP

ENSE

DBL

ACK

TONE

RDISP

ENSE

DCY

AN T

ONERDI

SPEN

SED

MAG

ENTA

TON

ER

DISP

ENSE

DYE

LLOW

TONE

R

9.13

9.12

9.11

9.10

This

mod

el h

as n

o Lo

w T

oner

Sen

sor.

Low

Ton

er/T

oner

Em

pty

is d

etec

ted

by A

TC S

enso

r-se

nsed

Tone

r Con

cent

ratio

n in

Dev

e As

sy a

nd IC

DC C

ontro

l. Fo

r the

ATC

Sens

or w

iring

, see

CH9

-9.1

3.

Tone

r Den

sity

Con

trol

ICDC

Con

trol e

stim

ates

tone

r con

sum

ptio

n qt

y fo

r Dis

pens

e Co

ntro

l.Di

spen

se Q

ty is

cor

rect

ed a

ccor

ding

to A

TC S

enso

r-se

nsed

Ton

erCo

ncen

tratio

n in

Dev

e As

sy.

Tone

r Em

pty

Dete

ctio

n

Whe

n AT

C Se

nsor

-sen

sed

Tone

r Con

cent

ratio

n in

Dev

e As

sy re

duce

sbe

low

the

spec

, Low

Ton

er is

det

ecte

d.W

hen

a to

tal I

CDC

valu

e ex

ceed

s th

e sp

ec a

fter t

he d

etec

tion

of L

owTo

ner,

Tone

r Em

pty

is d

etec

ted.

NOTE

:

Neve

r rep

eat t

urni

ng o

n DC

330

[009

-001

] - [0

09-0

04]

Turn

ing

on T

oner

Dis

pens

e M

otor

repe

ated

ly c

ause

s to

ner

bloc

king

in D

eve

Assy

.

7750

-306

Page 393: Phaser 7750 Service Manual

10-69

ADC and Environment Sensing

9.20

9.21

9.22

9.23

9.31

E

9.31

D

9.31

E

9.16

ADC

AND

ENV

IROM

ENT

SENS

ING

MCU

PW

BPL

13.1

I/F PWB

PL9.

1P/

J410

114

113

115

116

+5VD

C

+5VD

C

+5VD

C

+24V

DC

+24V

DC

+5VD

C

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

A10

A11

A13

A9 A8 A7 A6

DC 3

00 [0

09-0

76]

ADC

SENS

OR L

ED 2

ON (L

) +5V

DC

DC 3

00 [0

09-0

77]

ADC

SENS

OR L

ED 1

ON (L

) +5V

DC

DC 3

00 [0

09-0

78] (

100m

s)AD

C SE

NSOR

SOL

ENOI

DNI

P (L

) +24

VDC

DC 3

00 [0

09-0

79] (

100m

s)AD

C SE

NSOR

SOL

ENOI

DRE

LEAS

E (L

) +24

VDC

J536

P602

BLU

BLU

BLU

BLU

BLU

BLU

45 6 8 4 3 2 1

3 1 5 6 7 8

4 3 1 5 6 7 8

DOUB

LEPL

UGJ6

02J1

44

YEL

YEL

GRY

VIO

BLU

ORN

AMP

2

3

1

LED

2LE

D 1

2J1

44J6

02P6

02

YEL

DOUB

LEPL

UG

72

BLUJ5

36A1

2I/F PWB

PL9.

1

MCU

PW

BPL

13.1

P/J4

1011

1

DC14

0 [0

09-2

50]

ADC

SENS

ORSE

NSED

SIG

NAL

ADC

SENS

ORSE

NSED

SIGN

AL

A

ADC

SENS

ORPL

13.1

TRAN

SFER

RED

ADC

PATC

H (Y

)TO

IBT

TRAN

SFER

RED

ADC

PATC

H (M

)TO

IBT

TRAN

SFER

RED

ADC

PATC

H (C

)TO

IBT

TRAN

SFER

RED

ADC

PATC

H (K

)TO

IBT

I/F P

WB

PL9.

1

+5VD

C

+5VD

C

DC C

OM

DC C

OM

B4 B2

J536

P619

YEL

YEL

DOUB

LEPL

UG

1 3

4 2

J619

J255

GRY

VIO

1 3

4 2

ENVI

RONM

ENT

SENS

OR P

L1.3

ENVI

RONM

ENT

TEM

P

HUM

IDIT

Y

B

J255

J619

YEL

YEL

1 3

4 2

DOUB

LEPL

UG

P619

DC14

0 [0

09-2

56]

ENVI

RONM

ENT

SENS

OR T

EMP.

SIGN

ALDC

140

[009

-257

]EN

VIRO

NMEN

TSE

NSOR

HUM

IDIT

Y SI

GNAL

ENVI

RONM

ENT

SENS

OR T

EMP.

SIGN

AL

ENVI

RONM

ENT

SENS

ORHU

MID

ITY

SIGN

AL

J536

YEL

YEL

I/F P

WB

PL9.

1M

CUPW

BPL

13.1

B1 B3

P/J4

1051 53

4

1 2 3

4

7750

-307

ADC

Sens

or u

ses

two

refle

cted

-ligh

t pat

hs w

hose

opt

ic a

xes

angl

edi

ffere

ntly

to s

ense

ADC

pat

ch d

ensi

ty le

vels

of b

lack

and

col

or.

LED

2, w

hich

is fo

r a s

pecu

lar l

ight

pat

h, tu

rns

on in

sen

sing

bla

ckde

nsity

.LE

D 1,

whi

ch is

for a

diff

use

light

pat

h, tu

rns

on in

sen

sing

col

or d

ensi

ty.

As s

oon

as A

DC S

enso

r Shu

ttle

open

s/cl

oses

, ADC

Sen

sor s

urfa

ce is

cle

aned

.

Vitrt

ual L

ine.

NOTE

:

Page 394: Phaser 7750 Service Manual

10-70 Phaser 7750 Printer Service Manual

Accumulator Belt Assembly Drive Control

MCU

PW

BPL

13.1

DC C

OMDC

COM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

1

2 2 2 2

4 3 2

P/J4

10I/F P

WB

PL9.

1

+24V

DCIN

TLK

+24V

DC IN

TLK

1 2 3 4 5

DC33

0 [0

04-0

02]

IBT

MOT

ORON

+24

VDC

CLO

CK

DC33

0 [0

04-0

02]

IBT

MOT

ORON

+24

VDC

CLO

CK

DC33

0 [0

04-0

02]

IBT

MOT

ORON

+24

VDC

CLO

CK

DC33

0 [0

04-0

02]

IBT

MOT

ORON

+24

VDC

CLO

CK

J551

IBT

MOT

ORPL

1.1

MOT

9.17

IBT

DRIV

E CO

NTRO

L

IBT

CLEA

NER

DRIV

E9.

28

Driv

es a

t hig

h sp

eed

for s

tand

ard

pape

r and

at h

alf s

peed

for O

HP fi

lm.

NOTE

:

Lift

up IB

T As

sy b

efor

e tu

rnin

g on

DC3

300

[004

-002

]. Tu

rnin

g on

IBT

mot

or w

ithou

t lift

ing

it up

may

dam

age

IBT.

Turn

ing

DC33

0 [0

04-0

02] a

llow

s IB

T M

otor

to ro

tate

at n

orm

al s

peed

DC33

0 [0

04-0

12] a

t hal

f spe

ed a

nd D

C330

[004

-013

] at d

oubl

e sp

eed.

11

7750

-308

Page 395: Phaser 7750 Service Manual

10-71

1st BTR Contact Retract Control

ON FWD

CLK

9.18

1ST

BTR

CON

TACT

RET

RACT

CON

TROL

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

+5VD

C

+5VD

C

+5VD

C

+5VD

C

P/J4

10

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+24V

DCIN

TLK

+24V

DC IN

TLK

A20

A19

A18

A17

A16

A15

A9A7B6B5B4B3B2B1

A1 A2 A3 A4 A5 A6 B774

J533

BLU

BLU

BLU

BLU

BLU

BLU

BLU

DC33

0 [0

09-0

54] C

ONTA

CTDC

330

[009

-055

] RET

RACT

1ST

BTR

MOT

ORON

+24

VDC

CLOC

K

DC33

0 [0

09-0

54] C

ONTA

CTDC

330

[009

-055

] RET

RACT

1ST

BTR

MOT

ORON

+24

VDC

CLOC

KDC

330

[009

-054

] CON

TACT

DC33

0 [0

09-0

55] R

ETRA

CT1S

T BT

R M

OTOR

ON +

24VD

C CL

OCK

DC33

0 [0

09-0

54] C

ONTA

CTDC

330

[009

-055

] RET

RACT

1ST

BTR

MOT

ORON

+24

VDC

CLOC

K

1 1 1 1

P639

DOUB

LEPL

UGDO

UBLE

PLUG

DOUB

LEPL

UG

1 2 3 4 5 6 121789101112

J639

P605

BLU

BLU

BLU

BLU

BLU

BLU

BLU

GRY

VIO

ORN

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

BLU

DC33

0 [0

04-0

14]

1ST

BTR

RETR

ACT

SENS

ORPO

WER

ON

(H)+

5VDC

DOUB

LEPL

UGDO

UBLE

PLUG

J605

P605

A7B7

YEL

BLU

BLU

J639

P639

67

J533

A14

71

DC33

0[00

9-20

3]1S

T BT

R RE

TRAC

TSE

NSOR

CONT

ACT(

H)+3

.3VD

C

I/F PWB

PL9.

1

MCU

PW

BPL

13.1

P/J4

10

3.3V

DC

J122

J605

J237

5 4 3 2 154321

P237

1ST

BTR

RETR

ACT

SENS

OR P

L5.4

3 12

J122 YE

LMOT

1

1 2Vi

rtual

line

2

9.31

D

1ST

BTR

RETR

ACT

SENS

ORSE

NSED

SIGN

AL

1ST

BTR

RETR

ACT

MOT

ORPL

5.4

ZONE A5

7750

-309

Befo

re ru

nnin

g th

is d

iagr

am, t

urn

on D

C330

[004

-014

] to

turn

on

+5VD

C to

1st

BTR

Con

tact

Ret

ract

Sen

sor.

ZONE H2

Page 396: Phaser 7750 Service Manual

10-72 Phaser 7750 Printer Service Manual

Accumulator Belt Assembly Positioning

IBT

HOM

E SE

NSOR

PL5.

41 3

2

3 1

2

B

A

9.31

A

9.31

A

9.19

IBT

POSI

TION

ING

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1P/

J410

DC C

OM

DC C

OM

DC C

OM

DC C

OM

90 89 30 29

+24

VDC

INTL

K

+24

VDC

INTL

K

DC C

OM

DC C

OM

DC C

OM

DC C

OM

1 2 3 4 5

J550 BL

U

BLU

BLU

BLU

BLU

DC33

0 [0

04-0

01]

DC33

0 [0

04-0

05]

IBT

STEE

RING

MOT

ORON

+24V

DC C

LOCK

DC33

0 [0

04-0

01]

DC33

0 [0

04-0

05]

IBT

STEE

RING

MOT

ORON

+24V

DC C

LOCK

DC33

0 [0

04-0

01]

DC33

0 [0

04-0

05]

IBT

STEE

RING

MOT

ORON

+24V

DC C

LOCK

DC33

0 [0

04-0

01]

DC33

0 [0

04-0

05]

IBT

STEE

RING

MOT

ORON

+24V

DC C

LOCK

1 1

3 3

11

P207

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

J207

IBT

STEE

RING

MOT

ORPL

1.3

5 4 3 2 154321

MOT

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

10

+5VD

C

74

DC C

OM

DC C

OM

DC C

OM

DC C

OMA1

2

A9 A10

J533

DC33

0 00

4-01

4]IB

T SE

NSOR

POW

ERON

(H) +

5VDC

BLU

BLU

BLU

P639

J639

P605

DRAW

ERCO

NNEC

TOR

DRAW

ERCO

NNEC

TOR

BLU

BLU

VIO

9 12 11214

A3 A7 A5B5B7B3

J605

J121

VIO

GRY

GRY

BLU

DC33

0 [0

04-0

14]

IBT

SENS

OR P

OWER

ON (H

) +5V

DC

DC33

0 [0

04-1

00]

IBT

HOM

E SE

NSOR

SENS

ED (H

) +5V

DCJ1

21

J119

IBT

EDGE

SEN

SOR

PL5.

4

YEL

ZONE D6

AMP

VIO

J119

YEL

ZONE D6

DC14

0 [0

04-1

00]

IBT

EDGE

SEN

SOR

SENS

ED S

IGNA

L

IBT

HOM

W S

ENSO

RSE

NSED

SIG

NAL

ZONE G4 ZONE J5

DC33

0 [0

04-1

00]

IBT

HOM

E SE

NSOR

SENS

ED (H

) +5V

DC

DC33

0 [0

04-1

00]

IBT

EDGE

SEN

SOR

SENS

ED S

IGNA

L

YEL

YEL

J605

P605

J639

BLU

BLU

BLU

BLU

B2 B4

A2 A4

5 3108

P639

DC33

0 [0

04-1

00]

IBT

HOM

E SE

NSOR

SENS

ED (H

) +5V

DC

DC14

0 [0

04-1

00]

IBT

EDGE

SEN

SOR

SENS

ED S

IGNA

L

I/F P

WB

PL9.

1

A13

A11

MCU

PW

BPL

13.1

+5VD

C

P/J4

1072 15

IBT

EDGE

SEN

SOR

SENS

ED S

IGNA

L

7750

-310

Whe

n DC

330

[004

-001

] tur

ns o

n, IB

T St

eerin

gM

otor

rota

tes

for 2

80m

s cl

ockw

ise

view

ed fr

omth

e m

otor

inst

allin

g ar

ea b

efor

e st

oppi

ng.

1000

ms

afte

r the

n, it

rota

tes

coun

terc

lock

wis

efo

r 610

ms

befo

re s

topp

ing.

Whe

n DC

330

[004

-005

] tur

ns o

n, IB

T St

eerin

gM

otor

rota

tes

for 2

80m

s cl

ockw

ise

view

edfro

m th

e m

otor

inst

allin

g ar

ea b

efor

e st

oppi

ng.

Turn

s on

with

Fro

nt In

terlo

ck S

witc

h cl

osed

,le

adin

g to

a +

5VDC

sup

ply

to IB

T Ho

me

Sens

or a

nd IB

T Ed

ge S

enso

r.

Virtu

al L

ine

NOTE

:

1 2

2

3

Page 397: Phaser 7750 Service Manual

10-73

Image Transfer to Accumulator Belt Y (As an Example)

9.10

9.10

9.10

9.28

9.26

6.11

9.16

9.21

TRAN

SFER

RED

IMAG

E (Y

) TO

IBT

TRAN

SFER

RED

ADC

PATC

H (Y

)TO

IBT

TRAN

SFER

RED

REGI

CON

PATC

H (Y

)TO

IBT

CONT

AMIN

ATED

DRUM

(Y)

1

2

P/J5

71

9.20

IMAG

E TR

ANSF

ER T

O IB

T (Y

)

CLEA

NED

IBT

DEVE

LOPE

DIM

AGE

(Y)

DEVE

LOPE

DAD

C PA

TCH

(Y)

DEVE

LOPE

DRE

GICO

NPA

TCH

(Y)

DC14

0 [0

09-2

00]

1ST

BTR

(Y) M

ONIT

ORJ5

01

YEL

YEL

ANAL

OG@

GND

I/F P

WB

PL9.

1 DC C

OM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

+5VD

C RE

F

+24V

DC IN

TLK

J553

DC C

OM

DC C

OMVI

ODC

COM

VIO

ORN

ORN

HVPS

PL9.

1

9 5 10 11 12 13

ANAL

OG@

GND

1ST

BTR

(Y)

MON

ITOR

P/J5

70HVPS

CONT

ROL

PWB

PL9.

1

HVPS

T5 PL9.

1

2 18

1815

, 16,

17

DC14

0 [0

09-0

51]

1ST

BTR

(Y)

REM

OTE

J501

J575

J575

YEL

HVPS

T6

PL9.

1 1ST

BTR

(Y)

POW

ERCO

NTRO

L

1ST

BTR

(Y)

POW

ERZO

NE C1

61 5

YEL

YEL

ANAL

OG@

GND

DC14

0 [0

09-2

00]

1ST

BTR

(Y)

MON

ITOR

4 3 2 1

I/F P

WB

PL9.

1 DC C

OM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

B12

B11

J535

DC C

OM

DC C

OMVI

O

ORN

ANAL

OG@

GRDJ5

76

DC14

0 [0

09-2

00]

1ST

BTR

(Y) M

ONIT

OR

1 2

4

7750

-311

HVPS

Con

trol P

WB

perfo

rms

1st B

TR o

n/of

f con

trol a

nd re

mot

e co

ntro

lby

con

duct

ing

seria

l com

mun

icat

ions

with

MCU

PW

B.Fo

r the

wiri

ng fr

om M

CU P

WB

to H

VPS

Cont

rol P

WB,

see

CH3

.1B

NOTE

:

12

Turn

ing

on D

C140

[009

-051

] allo

ws

1st B

TR fo

r eve

ry c

olor

to tu

rn o

n.

1ST

BTR

(Y)

POW

ERZO

NE J3

Page 398: Phaser 7750 Service Manual

10-74 Phaser 7750 Printer Service Manual

Image Transfer to Paper

65B6

151

16

DC C

OMDC

COM

64B7

142

25

B813

33

4

B912

44

3

B10

115

52

B11

106

61

DC C

OM

66

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

A

9.24

A IM

AGE

TRAN

SFER

TO

PAPE

R (1

OF

2)

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

10

1

J533

DC33

0 [0

09-0

51] (

CONT

ACT)

DC33

0 [0

09-0

52] (

RETR

ACT)

2ND

BTR

RETR

ACT

MOT

ORON

+24

VDC

CLOC

K

DC33

0 [0

09-0

51] (

CONT

ACT)

DC33

0 [0

09-0

52] (

RETR

ACT)

2ND

BTR

RETR

ACT

MOT

ORON

+24

VDC

CLOC

K

DC33

0 [0

09-0

51] (

CONT

ACT)

DC33

0 [0

09-0

52] (

RETR

ACT)

2ND

BTR

RETR

ACT

MOT

ORON

+24

VDC

CLOC

K

DC33

0 [0

09-0

51] (

CONT

ACT)

DC33

0 [0

09-0

52] (

RETR

ACT)

2ND

BTR

RETR

ACT

MOT

ORON

+24

VDC

CLOC

K

P612

YEL

YEL

YEL

YEL

YEL

YEL

DOUB

LEPL

UGDO

UBLE

PLUG

J612

P216

BLU

BLU

ORN

ORN

BLU

BLU

MOT

J216

2ND

BTR

RETR

ACT

MOT

ORPL

2.9

I/F P

WB

PL9.

1

DC C

OM

DC C

OM

+5VD

C

+5VD

C

B18

B20

J533

YEL

YEL

P612

DOUB

LEPL

UG

3 11513

J612

VIO

GRY

J140

3 12

J140

2ND

BTR

RETR

ACT

SENS

OR P

L2.9

YEL

YEL

J612

P612

DOUB

LEPL

UGJ5

33

DC33

0 [0

09-2

00]

2ND

BTR

RETR

ACT

SENS

ORSE

NSED

(L) +

3.3V

DC14

2B1

970

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1+3

.3VD

C

P/J4

10

22N

D BT

RRE

TRAC

T SE

NSOR

SENS

ED S

IGNA

L9.

31A

2nd

BTR

cont

acts

at p

ower

on,

and

retra

cts

5hrs

(adj

usta

ble

in N

VM)

afte

r pow

er o

ff or

IBT

stop

s or

whe

n M

/C s

huts

dow

n.

NOTE

:

Virtu

al L

ine

1

7750

-315

Page 399: Phaser 7750 Service Manual

10-75

Image Transfer to Paper (cont’d)

9.25

9.28

2

3

9.23 4.1

8.7

REGI

STRA

TED

PAPE

R

TRAN

SFER

RED

IMAG

E (Y

+M+C

+K)

TO O

BT

2ND

BTR

DRIV

E

MCU

PW

BPL

13.1

DC C

OM

J406

B7

I/F P

WB

PL9.

1J5

53

DC C

OM

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

4 3 2 1

2ND

BTR

SELE

CTTR

ANSF

ER (L

) +5V

DCCL

EAN

(H) +

5VDC

BLU

1

DC C

OM

DC C

OMVI

O

ORN

ORN

VIO

P/J5

70

15,1

6,17

18 8 7 6 10 11 12 13

J501

DC C

OM

+24V

DCIN

TLK

ANAL

OG G

ND

+5VD

C RE

F

2ND

BTR

CLEA

NVO

LTAG

E M

ONIT

OR

2ND

BTR

CLEA

N RE

MOT

E

2ND

BTR

TRAN

SFER

VOLT

AGE

MON

ITOR

DC14

0 [0

09-2

04]

2ND

BTR

TRAN

SFER

CURR

ENT

MON

ITOR

DC14

0 [0

09-0

52]

2ND

BTR

TRAN

SFER

REM

OTE

P/J5

71HVPS

T5

PL9.

1

2ND

BTR

POW

ERCO

NTRO

L

10 11

HVPS

CON

TROL

PW

BPL

9.1

J574 BLU

3

+5VD

C2N

D BT

RPO

WER

ZONE

C3

UNFU

SED

COPY

CONT

AMIN

ATED

IBT

2nd

BTR

Bias

sw

itchi

ngFo

r the

imag

e ar

ea o

n IB

T, 2

nd B

TR is

cha

rged

with

Tra

nsfe

r Bia

s(n

egat

ive)

so

that

tone

r on

IBT

will

be

trans

ferr

ed to

pap

er. (

Tran

sfer

)Fo

r the

non

-imag

e ar

ea o

n IB

T, 2

nd B

TR is

cha

rged

with

Rev

erse

Bias

(pos

itive

) so

that

tone

r will

be

prev

ente

d fro

m a

ttach

ing

to th

ero

ll. (C

lean

)

HVPS

Con

trol P

WB

perfo

rms

2nd

BTR

on/o

ff co

ntro

l and

rem

ote

cont

rol

by c

ondu

ctin

g se

rial c

omm

unic

atio

ns w

ith M

CU P

WB.

For t

he w

iring

from

MCU

PW

B to

HVP

S Co

ntro

l PW

B, s

ee C

H3.1

B

Turn

ing

on D

C140

[009

-052

] allo

ws

Tran

sfer

Bia

s to

be

outp

ut.

1

NOTE

:

23

7750

-316

9.24

B IM

AGE

TRAN

SFER

TO

PAPE

R (2

OF

2)

2ND

BTR

POW

ERZO

NE J2

Page 400: Phaser 7750 Service Manual

10-76 Phaser 7750 Printer Service Manual

Stripping

1

A

10.2

9.31

A

2

UNFU

SED

COPY

9.24

B

I/F P

WB

PL9.

1

I/F P

WB

PL9.

1

DC C

OM

+24V

DCIN

TLK

+24V

DCIN

TLK

+24V

DC IN

TLK

+24V

DC IN

TLK

J553

J533

B17

B15

+5VD

C

DC C

OM

4 3 2 1

DC C

OM

DC C

OMDC

COM

VIO

VIO

ORN

ORN

J501

P/J5

7015

,16,

17

18 9 10 11 12 13

ANAL

OG G

ND

+5VD

C RE

F

DTS

VOLT

AGE

MON

ITOR

UNFU

SED

COPY

HVPS

CON

TROL

PW

BPL

9.1

HVPS

PW

BPL

9.1

P/J5

7112

DC33

0 [0

09-0

53]

DTS

REM

OTE

DTS

POW

ERCO

NTRO

L

+5VD

CYE

L

YEL

DC C

OM

P612

4 6

12 12

DOUB

LEPL

UGDO

UBLE

PLUG

J612

J111

GRY

VIO

POB

SENS

ORPL

2.9

1 3

2J1

11

YEL

J612

115

P612

DC33

0 [0

09-2

01]

POB

SENS

ORSE

NSED

(L)

+3.3

VDC

J533

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1

B16

YEL

P/J4

10

+3.3

VDC

POB

SENS

ORSE

NSED

SIGN

AL

1J8

01DT

S PO

WER

HVPS

Con

trol P

WB

perfo

ms

DTS

on/o

ff co

ntro

l and

rem

ote

cont

rol b

yco

nduc

ting

seria

l com

mun

icatio

ns w

ith M

CU P

WB.

For t

he w

iring

from

MCU

PW

B to

HVP

S Co

ntro

l PW

B, s

ee C

H3.1

B.

NOTE

:

Virtu

al Li

ne1

2

STRI

PPED

UNFU

SED

COPY

7750

-317

9.25

STR

IPPI

NG

Page 401: Phaser 7750 Service Manual

10-77

Drum Cleaning (Y, M as an Example)

9.26

DRU

M C

LEAN

ING

(Y,M

)

MCU

PW

BPL

13.1

DC C

OM

+24V

DC

+24V

DC

B2 B1

MCU

PW

BPL

13.1

DC C

OM

+24V

DC

B4 B3

J403

DC33

0 [0

09-0

45]

ERAS

E LA

MP

(Y)

ON (L

) +24

VDC

J223

YEL

YEL

DOUB

LEPL

UG

P223

1

12

2

ERAS

E LA

MP

(Y) P

L4.2

+24V

DC

J403

DC33

0 [0

09-0

45]

ERAS

E LA

MP

(M)

ON (L

) +24

VDC

J224

YEL

YEL

DOUB

LEPL

UG

P224

1

12

2

ERAS

E LA

MP

(M) P

L4.2

9.5

9.20

CLEA

NER

(Y)

DRIV

E

CONT

AMIN

ATED

DRUM

(Y)

9.6

9.21

CLEA

NER

(M)

DRIV

E

CONT

AMIN

ATED

DRUM

(M)

9.5

9.29

CLEA

NED

DRUM

(Y)

WAS

TETO

NER

(Y)

9.6

9.29

CLEA

NED

DRUM

(M)

WAS

TETO

NER

(M) 77

50-3

18

Page 402: Phaser 7750 Service Manual

10-78 Phaser 7750 Printer Service Manual

Waste Toner Disposal9.

28

9.10

9.26

9.26

9.11

9.12

9.13

9.27

9.27

WAS

TE T

ONER

FROM

IBT

WAS

TETR

ICKL

E (Y

)

WAS

TETR

ICKL

E (M

)

WAS

TETR

ICKL

E (C

)

WAS

TETR

ICKL

E (K

)

WAS

TETO

NER

(Y)

WAS

TETO

NER

(M)

WAS

TETO

NER

(C)

WAS

TETO

NER

(K)

9.29

WAS

TE T

ONER

DIS

POSA

L

DOUB

LEPL

UG

12 1

2 DOUB

LEPL

UG

31 3

1

P233

J233

A

A1

MCU

PW

BPL

13.1

DC C

OM

DC C

OM

DC C

OMYE

L

BLU

+24V

DC IN

TLK

BLU

YEL

+5VD

C

+5VD

C

91 B15

B17

P/J4

10I/F P

WB

PL9.

1

J407

+24V

DCIN

TLK

A17

A16

J532

DC33

0 [0

09-0

34]

AGIT

ATOR

MOT

ORON

(L) +

24VD

C

J614

P614

J133

3 1

MOT

AGIT

ATOR

MOT

ORPL

4.1

FULL

TON

ER S

ENSO

RPL

4.1

2J1

33P6

14

DOUB

LEPL

UG

22

J614

DC33

0 [0

09-1

50]

FULL

TON

ER S

ENSO

RSE

NSED

(H) +

3.3V

DCJ4

07

YEL

B16M

CU P

WB

PL13

.1

+3.3

VDC

9.31

E

FULL

TON

ERSE

NSOR

SENS

EDSI

GNAL 77

50-3

20

NOTE

: 1Vi

rtual

Lin

e

WAS

TE T

ONER

BOT

TLE

INTE

RLOC

K SW

ITCH

Page 403: Phaser 7750 Service Manual

10-79

Rear Fan Control

1

MOT

MCU

PW

BPL

13.1

I/F P

WB

PL9.

1

P/J4

1062

2 1 4

+24V

DC

DC C

OM

DC C

OM

J552

DC33

0 [0

04-0

50]

REAR

FAN

HIGH

SPEE

D (L

) +24

VDC

BRN

RED

BLK

REAR

FAN

PL8.

1

FAN

DC33

0 [0

04-2

00]

REAR

FAN

LOCK

ED (H

) +3.

3VDC

YEL

J552

EXHA

UST

AIR

3I/F P

WB

PL9.

1

P/J4

1063

+3.3

VDC

MCU

PW

BPL

13.1

9.30

REA

R FA

N CO

NTRO

L

7750

-321

Rear

Fan

sta

rts lo

w-s

peed

rota

tion

at p

ower

on

and

keep

s it

with

M/C

on

stan

dby.

Rear

Fan

sta

rts h

igh

spee

d ro

tatio

n at

Main

Mot

or O

n an

d tra

nsits

to lo

w-s

peed

rota

tion

15se

c (a

djus

tabl

e in

NVM

) afte

r Main

Mot

or O

ff.In

Slee

p m

ode,

the

Fan

stop

s ro

tatio

n be

caus

e +2

4VDC

is c

ut o

ff.

1

Page 404: Phaser 7750 Service Manual

10-80 Phaser 7750 Printer Service Manual

Fusing

4.1B

10.1

9.25

MOT

1

1 2

A2

10.6

10.3

B

10.2

FUS

ING

MCU

PW

BPL

13.1

DC C

OM

DC C

OM

DC C

OM+2

4VDC

+24V

DC

A15

A14

A17

J407

DC33

0 [0

04-0

50]

FUSE

R FA

N HI

GHSP

EED

(L) +

24VD

CJ2

22

BLU

BLU

BLU

DOUB

LEPL

UGDO

UBLE

PLUG

32 1 4

4 1

P222

P222

J222

FUSE

R FA

NPL

8.1

FAN

32

EXHA

UST

AIR

DC33

0 [0

04-2

00]

FUSE

R FA

NLO

CKED

(H) +

3.3V

DC

BLU

J407

A16M

CU P

WB

PL13

.1 +3.3

VDC

FUSE

R FA

N LO

CKFA

IL S

IGNA

L10

.6

2 FUSE

D CO

PY

FUSE

R DR

IVE

FUSI

NG H

EAT

STRI

PPED

UNFU

SED

COPY

I/F P

WB

PL9.

1B1

4J5

33

DC C

OM

DC C

OM

P612

J612

YEL

DOUB

LEPL

UGDO

UBLE

PLUG

DOUB

LEPL

UGDO

UBLE

PLUG

VIO

P113

12

12

88

79

J113

J113

P113

FUSE

R EX

ITSW

ITCH

PL2.

8

MAG

NET

J612

YEL

YEL

P612

DC33

0 [0

10-1

01]

FUSE

R EX

IT S

WIT

CHSE

NSED

(H) +

3.3V

DCJ5

33B1

368

P/J4

10

I/F P

WB

PL9.

1M

CU P

WB

PL13

.1 +3.3

VDC

FUSE

R EX

ITSW

ITCH

SENS

ED S

IGNA

L 7750

-322

Rear

Fan

sta

rts lo

w-s

peed

rota

tion

at p

ower

on

and

keep

s it

with

M/C

on

stan

dby.

Rear

Fan

sta

rts h

igh-

spee

d ro

tatio

n at

Mai

n M

otor

On

and

trans

its to

low

-spe

edro

tatio

n 15

sec

(adj

usta

ble

in N

VM) a

fter m

ain

Mot

or O

ff.In

Sle

ep m

ode,

the

Fan

stop

s ro

tatin

g be

caus

e +2

4VDC

is c

ut o

ff.

Virtu

al L

ine

NOTE

S:

Page 405: Phaser 7750 Service Manual

10-81

Inverter

A

B

10.3

A IN

VERT

ER (1

OF

2)

MCU

PW

BPL

13.1

DC C

OM

DC C

OM

+24V

DC

+24V

DC

+24V

DC

+24V

DC

A8 A9 A10

A11

J407

DC33

0 [0

08-0

42] (

400m

s)IN

VERT

ER F

ORW

ARD

CLUT

CH O

N (L

) +24

VDC

DC33

0 [0

08-0

42] (

400m

s)IN

VERT

ER R

EVER

SECL

UTCH

ON

(L) +

24VD

C

BLU

BLU

BLU

BLU

BLU

ORN

BLU

ORN

BLU

ORN

BLU

ORN

DOUB

LEPL

UGDO

UBLE

PLUG

P613

68 9 10 11

5 4 3

J613

P633

J633

DRAW

ERCO

NNEC

TOR

B6A6 A5 A4 A3

B5 B4 B3

P217

J217

P218

1 2

2 1

INVE

RTER

REVE

RSE

CLUT

CHPL

11.2

INVE

RTER

FORW

ARD

CLUT

CHPL

11.2

4 1

4.1B

INVE

RTER

DRI

VE

10.4

B

10.4

B

10.4

B

EXIT

ROL

LDR

IVE

FACE

UP

EXIT

ROLL

DRI

VE

FUSE

R EX

ITRO

LL D

RIVE

7750

-323

Page 406: Phaser 7750 Service Manual

10-82 Phaser 7750 Printer Service Manual

Inverter (cont’d)

1

2

3 3

32

1

12 1

2DOUB

LEPL

UG

DOUB

LEPL

UG

12 1

2DOUB

LEPL

UG

B

A

10.4

A

10.4

A

10.4

A

10.2

113 1

13DOUB

LEPL

UG

33 5

1DOUB

LEPL

UG

A5B5 B7

A7DRAW

ERCO

NNEC

TOR

DRAW

ERCO

NNEC

TOR

C

3 12

FACE

UP

EXIT

SENS

OR P

L11.

2

C

3 12

FULL

PAP

ER S

TACK

SENS

OR P

L10/

2.11

B6A6

212

DOUB

LEPL

UG

42

10.6

10.6

MCU

PWB

PL13

.1

DC C

OM

DC C

OM DC C

OM

+5VD

C

A3 A1

I/F P

WB

PL9.

1

DC C

OM

+5VD

C

B15

B17

MCU

PW

BPL

13.1

A4 A5 A6 A7

DC C

OM

DC C

OM

+24V

DC

+24V

DC

J407

BLU

BLU

BLU

BLU

DC33

0 [0

08-0

45] (

200m

s)EX

IT G

ATE

SOLE

NOID

ON (L

) +24

VDC

DC33

0 [0

08-0

46] (

200m

s)DU

PLEX

GAT

E SO

LENO

IDON

(L) +

24VD

C

12.3

10.5

CC

AC

10.3

B IN

VERT

ER (2

OF

2)

P613

DOUB

LEPL

UG

10 9 8 77654

J613

+24V

DC

+24V

DC

BLU

ORN

BLU

ORN

BLU

ORN

BLU

ORN

P633

DRAW

ERCO

NNEC

TOR

A4B4 B3 B2 B1

A3 A2 A1

J633

P251

J251

DUPL

EX G

ATE

SOLE

NOID

PL11

.2

P215

J215

EXIT

GAT

ESO

LENO

IDPL

11.2

EXIT

ROL

L DR

IVE

FACE

UP

EXIT

ROLL

DRI

VE

FUSE

R EX

ITRO

LL D

RIVE

FUSE

D CO

PYTO

INVE

RTER

TO F

ACE

UP T

RAY

COPY

TO

FACE

DOW

N TR

AY

COPY

TO

FINI

SHER

INVE

RTED

COP

Y

J407

BLU

BLU

+5VD

C +5VD

CP613

J613

J532

P611

YEL

YEL

P633

VIO

GRY

J611

VIO

VIO

GRY

GRY J1

04

J633

J102

J102

J633

J104

YEL

YEL

YEL

J611J6

33J6

13P6

13

P611

DC33

0 [0

10-1

03]

FACE

UP

EXIT

SENS

OR S

ENSE

D(H

) +3.

3VDC

J407

BLU

YEL

J532

B16I/F

PW

BPL

9.1

A2

MCU

PW

BPL

13.1 +3

.3VD

C

+3.3

VDC

P/J4

1041

DC33

0 [0

10-1

02]

FULL

PAP

ER S

TACK

SENS

OR S

ENSE

D(L

) +3.

3VDC

NOTE

: Sole

noid

On

allo

ws

switc

hing

toth

e pa

th fo

e pa

per t

o ex

it fa

ce u

p.So

leno

id O

n al

low

s sw

itchi

ngto

the

path

for D

uple

x.Vi

rtual

Lin

e

7750

-324

Page 407: Phaser 7750 Service Manual

10-83

Duplex Drive Control

DC C

OM

DC C

OM

DC C

OM

A10

A11

A12

DOUB

LEPL

UG

5 4 3

7 8 9

DRAW

ERCO

NNEC

TOR

B5 B4 B3

A5 A4 A3

YEL

YEL

YEL

YEL

YEL

YEL

J640

P626

J626

J538

DC C

OM

DC C

OM

DC C

OM

DC C

OM

+24V

DC

10.5

1 1 1TD 1

1 TD 1MCU

PW

BPL

13.1

J406

DC33

0 [0

08-0

09-0

12]

DUPL

EX M

OTOR

ON

(L) +

5VDC

DC33

0 [0

08-0

09-0

12]

DUPL

EX M

OTOR

REF

CLOC

K

DC33

0 [0

08-0

09-0

12]

DUPL

EX M

OTOR

HIGH

SPE

ED (L

) +5V

DC

P640

YEL

YEL

YEL

DUPL

EX P

WB

PL12

.2

+5VD

C

+5VD

C

+5VD

C

7 8 9

1 2 3 4 5 6

J539

DUPL

EXM

OTOR

PL12

.2DU

PLEX

MOT

ORON

24V

CLO

CK

DUPL

EX M

OTOR

ON 2

4V C

LOCK

DUPL

EX M

OTOR

ON 2

4V C

LOCK

DUPL

EX M

OTOR

ON 2

4V C

LOCK

+24V

DC

+24V

DCM

OT

DUPL

EXDR

IVE

10.4

DUP

LEX

DRIV

E CO

NTRO

L

Oper

atio

n sp

eed

and

dura

tion

vary

acc

ordi

ng to

diag

cod

e.

Test

Poi

nt: P

600-

4(+)

to P

600-

6(-)

afre

quen

cy o

f app

rox.

2.1

KHz

DUPL

EX M

OTOR

Oper

atio

n Sp

eed

Oper

atio

ndu

ratio

n

DC33

0 [0

08-0

09]

DC33

0 [0

08-0

10]

DC33

0 [0

08-0

11]

DC33

0 [0

08-0

12]

200m

m/s

ec10

00m

s

1000

ms

Long

Long

200m

m/s

ec

104m

m/s

ec

104m

m/s

ec

NOTE

:

7750

-325

Page 408: Phaser 7750 Service Manual

10-84 Phaser 7750 Printer Service Manual

Duplex Drive

10.3

B

10.4

A

B

3 12

DUPL

EX W

AIY

SENS

ORPL

12.2

DRAW

ERCO

NNEC

TOR

A7 A6

B7 B6

DOUB

LEPL

UG

5 6

7 6

10.6

8.7

10.6

10.5

DUP

LEX

DRIV

E

INVE

RTED

COPY

DUPL

EX D

RIVE

DUPL

EXPW

BPL

12.2

DC C

OM

DC C

OM

+5VD

C

J540

J135

J135

DC C

OM

DC C

OM

VIO

VIO

GRY

+5VD

C

J136

J136

DUPL

EX C

OVER

INTE

RLOC

KSW

ITCH

PL1

2.2

DUPL

EX

PWB

PL12

.2

3 5 12

1YE

L

YEL

J540

4 265

J538

J626

P626

YEL

YEL

YEL

YEL

YEL

YEL

J640

P640

DC33

0 [0

08-1

05]

DUPL

EX W

AIT

SENS

ORSE

NSED

(H) +

5VDC

DC33

0 [0

08-3

00]

DUPL

EX C

OVER

INTE

RLOC

K SW

ITCH

CLOS

ED (L

) +3.

3VDC

J406

A8 A9

MCU

PW

BPL

13.1

+5VD

C

+3.3

VDC

DUPL

EX W

AIT

SENS

ORSE

NSED

SIG

NAL

DUPL

EX C

OVER

INTE

RLOC

K SW

.SE

NSED

SIG

NAL

DUPL

EX O

UTCO

PY

11

NOTE

:

1Vi

rtual

Lin

e77

50-3

26

Page 409: Phaser 7750 Service Manual

10-84 Phaser 7750 Printer Service Manual

Duplex Drive

10.3

B

10.4

A

B

3 12

DUPL

EX W

AIY

SENS

ORPL

12.2

DRAW

ERCO

NNEC

TOR

A7 A6

B7 B6

DOUB

LEPL

UG

5 6

7 6

10.6

8.7

10.6

10.5

DUP

LEX

DRIV

E

INVE

RTED

COPY

DUPL

EX D

RIVE

DUPL

EXPW

BPL

12.2

DC C

OM

DC C

OM

+5VD

C

J540

J135

J135

DC C

OM

DC C

OM

VIO

VIO

GRY

+5VD

C

J136

J136

DUPL

EX C

OVER

INTE

RLOC

KSW

ITCH

PL1

2.2

DUPL

EX

PWB

PL12

.2

3 5 12

1YE

L

YEL

J540

4 265

J538

J626

P626

YEL

YEL

YEL

YEL

YEL

YEL

J640

P640

DC33

0 [0

08-1

05]

DUPL

EX W

AIT

SENS

ORSE

NSED

(H) +

5VDC

DC33

0 [0

08-3

00]

DUPL

EX C

OVER

INTE

RLOC

K SW

ITCH

CLOS

ED (L

) +3.

3VDC

J406

A8 A9

MCU

PW

BPL

13.1

+5VD

C

+3.3

VDC

DUPL

EX W

AIT

SENS

ORSE

NSED

SIG

NAL

DUPL

EX C

OVER

INTE

RLOC

K SW

.SE

NSED

SIG

NAL

DUPL

EX O

UTCO

PY

11

NOTE

:

1Vi

rtual

Lin

e77

50-3

26

Page 410: Phaser 7750 Service Manual

Pha

ser

7750

Pri

nter

10-8

5

Phas

er 7

750

Wiri

ng S

chem

atic

1 o

f 6

Page 411: Phaser 7750 Service Manual

10-8

6P

hase

r 77

50 P

rint

er

Phas

er 7

750

Wiri

ng S

chem

atic

2 o

f 6

Page 412: Phaser 7750 Service Manual

Pha

ser

7750

Pri

nter

10-8

7

Phas

er 7

750

Wiri

ng S

chem

atic

3 o

f 6

Page 413: Phaser 7750 Service Manual

10-8

8P

hase

r 77

50 P

rint

er

Phas

er 7

750

Wiri

ng S

chem

atic

4 o

f 6

Page 414: Phaser 7750 Service Manual

Pha

ser

7750

Pri

nter

10-8

9

Phas

er 7

750

Wiri

ng S

chem

atic

5 o

f 6

Page 415: Phaser 7750 Service Manual

10-9

0P

hase

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50 P

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er

Phas

er 7

750

Wiri

ng S

chem

atic

6 o

f 6

Page 416: Phaser 7750 Service Manual

10-9

2P

hase

r 77

50 P

rint

er

Page 417: Phaser 7750 Service Manual

11Chapter

Phaser 7750 Finisher

In this chapter...■ Phaser 7750 Finisher

■ Finisher Specifications

■ Finisher Assemblies

■ Finisher Disassembly

■ Finisher Service Parts List

Page 418: Phaser 7750 Service Manual

11-2 Phaser 7750 Printer Service Manual

Phaser 7750 Finisher

Finisher Overview

■ The finisher is a customer installed option that contains a horizontal transport, stapler, compiler, and stacker.

■ The finisher docks with the print engine and finisher stand.

■ The finisher’s built in power supply takes +24 VDC from the printer and provides all the DC voltages required.

S7700-444

Page 419: Phaser 7750 Service Manual

11-3

Finisher Specifications

Category Specification

Configuration User installed option. The finisher provides stapling (up to 50 sheets), print job offset and stacking up to 1,000 sheets of paper. The finisher docks with the printer and stand. All finisher operations are controlled by the finisher control board.

Paper feed Paper leaving the exit section of the printer is fed to the paper catch area then directly into the horizontal transport. The horizontal transport then delivers the paper to the finisher where stapling, offsetting (jogging) and stacking occur.

Power requirements

The printer provides +24 VDC to the finisher. The finisher’s power supply provides all required DC voltages throughout the finisher option.The Phaser 7750 Light Finisher shall meet FCC part 15, subpart B, Class A. CISPR22 Class A.

Dimensions:shown in mm.

Media Types Long-Edge Feed (LEF) Short-Edge Feed (SEF)B5 A3A4 A4Letter B4

8” x 10”Letter

US FolioLegal

Tabloid

Media Weight 64 - 105 g/m2 (Thick/Thin paper)

Page 420: Phaser 7750 Service Manual

11-4 Phaser 7750 Printer Service Manual

Stacker Capacity 1000 non-stapled sheets (20 lb. paper, letter/A4 or smaller)500 unstapled sheets (20 lb. paper, over size Letter/A4)300 unstapled sheets (Mix Stack / loading large on small)50 stapled sets

Staple Cartridge Capacity

5000 staples

Category Specification

Page 421: Phaser 7750 Service Manual

11-5

Finisher Assemblies

S7700-445

Gate Unit

Horizontal Transport

Staple Finisher

Stacker

Stand

Page 422: Phaser 7750 Service Manual

11-6 Phaser 7750 Printer Service Manual

Internal Assemblies of the Finisher

Exit Assembly

Main Motor

Finisher Control Board

Decurler

Compiler Tray

Stacker MotorAssembly

Staple Assembly Track

Cam Bracket Assembly

Staple UnitS7700-372

Page 423: Phaser 7750 Service Manual

11-7

Horizontal Transport Sensor, Interlock and Switch Locations

IOT Face DownTray Full Sensor

H-TransportEntrance Sensor

Gate In Solenoid

H-Transport Interlock Sensor

H-Transport Exit Sensor S7700-447

Page 424: Phaser 7750 Service Manual

11-8 Phaser 7750 Printer Service Manual

Finisher Sensor, Interlock and Switch Locator Map

S7700-449

Rear

Eject Clamp Home SensorStack Height Sensor

Decurler CamHome Sensor

Docking Interlock Sensor

Set Clamp Home Sensor

Full Stack Sensor

Page 425: Phaser 7750 Service Manual

11-9

Finisher Sensor, Interlock and Switch Locator Map

Page 426: Phaser 7750 Service Manual

11-10 Phaser 7750 Printer Service Manual

Finisher Disassembly

This section details the removal and replacement procedures for the main assemblies of the Phaser 7750 light finisher.

When replacing sensors, actuators, interlocks and/or switches;

■ Refer to the appropriate locator map to identify the sensor.

■ Remove the necessary covers.

■ Press down on the two locking tabs located at the top of the sensor, press up on the two locking tabs at the bottom of the sensor and remove the sensor.

Page 427: Phaser 7750 Service Manual

11-11

Horizontal Transport Assembly

1. Unplug the finisher from the printer.

2. Lift the two hooks securing the horizontal transport assembly to the finisher.

3. Remove the horizontal transport assembly.

Page 428: Phaser 7750 Service Manual

11-12 Phaser 7750 Printer Service Manual

Horizontal Transport Top Open, Front, and Rear Cover

1. Remove the horizontal transport assembly, see page 11-11.

2. Remove 1 screw securing the stopper.

3. Remove 2 screws from the horizontal transport front cover and remove the cover.

4. Remove the hinge screw and remove the top open cover.

5. Remove 2 screws securing the horizontal transport rear cover.

6. Remove the horizontal transport entrance upper cover assembly.

7. Remove the horizontal transport exit guide by pressing on the tabs on the lower right edge of the horizontal transport frame.

8. Remove the upper rear cover.

S7700-452

Page 429: Phaser 7750 Service Manual

11-13

Horizontal Transport Entrance Upper Cover Assembly

1. Remove the horizontal transport assembly, see page 11-11.

2. Remove the front cover, see page 11-12.

3. Remove 2 screws securing the rear cover and remove.

4. Remove the gate-in solenoid assembly.

5. Remove 4 screws securing the entrance upper cover assembly.

Page 430: Phaser 7750 Service Manual

11-14 Phaser 7750 Printer Service Manual

Horizontal Transport Belts

1. Remove the horizontal transport covers, see page 11-12.

2. Remove the KL-clips from the horizontal transport in and out.

3. Remove the bearings from the horizontal transport in and out shafts.

4. Remove one end of each horizontal transport belt roller support.

5. Remove the belts.

Replacement

NoteWhen reinstalling the belts, ensure that the textured side is out.

NoteIf necessary, remove the KL-clip and gear from the out roller to reinstall the belts to help install the bearing.

Page 431: Phaser 7750 Service Manual

11-15

Horizontal Transport Entrance Sensor and Top Tray Full Sensor

1. Remove the horizontal transport top open and front cover, see page 11-12.

2. Remove the 2 screws securing the horizontal transport entrance upper cover, see page 11-13

3. Remove the entrance sensor cover, pry up on the locking tab while pressing firmly towards the entrance end of the transport.

4. Disconnect the wiring harness connector.

5. Press down on the two locking tabs located at the top of the sensor, press up on the two locking tabs at the bottom of the sensor and remove the sensor.

Top Tray Sensor

1. Disconnect the wiring harness.

2. Remove 1 screw and remove the sensor bracket and sensor.

NoteWhen replacing the sensor be sure the harness guide is engaged into the cover.

Page 432: Phaser 7750 Service Manual

11-16 Phaser 7750 Printer Service Manual

Gate-In Solenoid Assembly

1. Remove the Rear Cover.

2. Disconnect the ground wire from the solenoid housing.

3. Remove the 2 screws securing the Gate-In Solenoid Assembly and remove.

Page 433: Phaser 7750 Service Manual

11-17

Finisher Covers

1. Remove the Horizontal Transport Assembly, see page 11-11.

2. Remove 1 screw from the Left Panel and remove.

3. Remove 5 screws from the Rear Cover.

4. Clear the gear at the top of the Rear Cover and remove the cover.

S7700-396

Front Cover

Left Panel

Left Top Cover

Rear Cover

Left Cover

Page 434: Phaser 7750 Service Manual

11-18 Phaser 7750 Printer Service Manual

5. Open the front door.

6. Remove 4 screws securing the front cover and remove.

7. Remove 2 screws from the left cover and lift up and out to remove.

8. Loosen the 4 screws securing the top cover.

9. Remove the left portion of the top cover assembly.

10. Open the top door and remove the front and back screws.

11. Pop off both straps, tilt the cover up and remove.

NoteWhen installing the rear cover, be sure that the two cables exiting the rear cover are properly aligned around the plastic tab in the exit way. If not, the cables fall to the bottom of the exit way and the cable to the horizontal transport cannot reach the cable connector on the transport.

Page 435: Phaser 7750 Service Manual

11-19

Stack Height-Sensor Assembly

1. Remove the horizontal transport assembly, see page 11-11.

2. Remove the top cover, see page 11-17.

3. Remove 1 screw from the Stack Height Sensor bracket.

4. Press down on the two locking tabs located at the top of the sensor, press up on the two locking tabs at the bottom of the sensor and remove the sensor.

Page 436: Phaser 7750 Service Manual

11-20 Phaser 7750 Printer Service Manual

Stacker Paper-Sensor Assembly

1. Loosen the thumb screw and remove the stacker tray.

2. Remove the 4 screws securing the stacker paper sensor assembly to the finisher.

3. Remove 2 screws from the bottom of the assembly.

4. Remove 1 screw on the sensor bracket.

5. Press down on the two locking tabs located at the top of the sensor, press up on the two locking tabs at the bottom of the sensor and remove the sensor.

6. Remove the connector from the sensor.

Page 437: Phaser 7750 Service Manual

11-21

Set Clamp Clutch and Gear

1. Remove the rear cover, see page 11-17.

2. Remove the set clamp actuator.

3. Remove 1 screw from the set clamp actuator retainer and remove.

4. Remove the clutch collar and clutch.

5. Remove the gear.

NoteWhen replacing, after installing the clutch collar you need to depress the clutch solenoid and rotate the set clamp shaft 1/4 revolution Counter-Clockwise. Then install the set clamp actuator. Then rotate the clutch until the solenoid snaps into position.

Page 438: Phaser 7750 Service Manual

11-22 Phaser 7750 Printer Service Manual

Eject Roll Assembly

1. Remove the rear and left covers, see page 11-17.

2. Remove sack paper sensor assembly, see page 11-20.

3. Undo the intermediate connector.

4. Remove the right cover.

5. Remove the set camp clutch and gear, see page 11-21.

6. Remove both KL-clips from the set clamp shaft.

7. Push the bearings out of the frame assembly and remove the shaft.

Page 439: Phaser 7750 Service Manual

11-23

Finisher Control Board, Bracket and Shield

1. Remove the rear cover, see page 11-17.

2. Remove 8 screws and loosen the two bottom screws.

3. Remove finisher control board shield.

4. Undo all the connectors.

5. Remove 2 screws on the left.

6. Loosen 1 screw on the right.

7. Undo one connector.

8. Loosen the outer screws located at the bottom of the finisher control board cover.

9. Remove the 8 remaining cover screws.

Page 440: Phaser 7750 Service Manual

11-24 Phaser 7750 Printer Service Manual

10. Remove the finisher control board cover.

11. Remove the 4 wiring connectors.

12. Remove 6 screws from the control board remove.

NoteWhen reinstalling the cover, do not insert screws into the second or fourth holes at the bottom of the cover as these are used to secure the outer cover.

Page 441: Phaser 7750 Service Manual

11-25

Stacker Motor Assembly

1. Remove the finisher control board bracket, and shield, see page 11-23.

2. Remove 1 connector.

3. Remove 3 screws securing the stacker motor assembly and remove.

NoteWhen reinstalling, ensure the gear is engaged and the sensor for the stacker is tripped.

Page 442: Phaser 7750 Service Manual

11-26 Phaser 7750 Printer Service Manual

Paddle Shaft

1. Remove the rear, left and right covers, see page 11-17.

2. Remove the cam bracket assembly, see page 11-28.

3. Remove the staple unit, see page 11-29.

4. Remove the e-clips from both ends of the shaft.

5. Remove the gear and bushing from the front end of the shaft.

6. Remove the bushing from the front and slide out the shaft.

7. Remove the bushings and KL-clips from both ends.

8. Slide the shaft to the rear and slide out.

Page 443: Phaser 7750 Service Manual

11-27

Paper Transport Motor (Motor Assembly Main)

1. Remove the Rear Cover, see page 11-17.

2. Remove 4 screws.

3. Undo the connector and lift the motor up and then out to free the belt.

Page 444: Phaser 7750 Service Manual

11-28 Phaser 7750 Printer Service Manual

Cam Bracket Assembly

1. Remove the rear and top covers, see page 11-17.

2. Remove 1 screw securing the decurler cam sensor.

3. Remove 1 screw from the eject clamp home sensor.

4. Disconnect the wiring harness from the set clamp home sensor.

5. Remove the wiring harness from the bracket.

6. Disconnect the wiring harness from the eject motor.

7. Remove 4 screws from the bracket and remove the cam bracket assembly.

NoteWhen reinstalling the cam bracket assembly the manipulate the eject assembly to ensure the gears follow one another from the back of the cam bracket assembly. Manually push the set clamps to engage the gears.

Page 445: Phaser 7750 Service Manual

11-29

Staple Unit Assembly and Motor

Staple Unit Assembly

1. Remove the front cover, see page 11-17.

2. Remove the 2 connectors to the staple unit.

3. Remove 2 screws, note: one screw has a ground wire.

4. Pull the staple unit assembly down, tilt up and pull out towards the front.

Staple Motor

1. Remove the staple unit assembly.

2. Remove the right cover.

3. Disconnect the wiring harness.

4. Remove 2 screws and remove the motor.

S7700-050

1

6V

4 5

3

67

2

Page 446: Phaser 7750 Service Manual

11-30 Phaser 7750 Printer Service Manual

Compiler Tray

1. Remove all covers, see page 11-17.

2. Remove the finisher control board shield, see page 11-23.

3. Disconnect P848.

4. Remove the set clamp solenoid connector.

5. Remove the staple unit, see page 11-29.

6. Remove 2 screws from the bottom of the tamper assembly, front and rear.

7. Push the wiring harness into the printer frame.

8. Tilt the carriage up and slide straight back letting the carriage drop down in the frame, then slide straight out the stapler cavity.

Page 447: Phaser 7750 Service Manual

11-31

Finisher Wiring Diagrams

DC Power and Interlock Switches

I/F P

WB

PL9.

1

+24V

DC(1

.5)

DC C

OM(1

.5)

J530

P800

ORN

VIO

11 8 12

CH12

ALL

A

A

TOP

COVE

RIN

TERL

OCK

SWIT

CHPL

17.1

3

2B 1A1B2A

34 1

2

FRON

T DO

ORIN

TERL

OCK

SWIT

CHPL

17.1

3

2B 1A1B2A

34 1

2

J890

12.1

1A

12.1

1A

12.1

1A

1 1

1

K1

CH12

ALL

312

DOCK

ING

INTE

RLOC

K SE

NSOR

PL17

.13

12.1

FIN

ISHE

R DC

POW

ER A

ND IN

TERL

OCK

SWIT

CHES

FINI

SHER

PW

BPL

17.1

3

DC C

OM

2 1 4

DC C

OM

J851

J851

YEL

YEL

YEL

ORN

ORN

ORN

ORN

ORN

ORN

ORN

+24V

DCJ8

44J8

92

TP1

CR7

DC C

OMDC

COM

CH12

ALL

RT1

+24V

DCTO

+5VD

C

J844

1 452

1

YEL

YEL

J890

DC33

0 [1

2-30

1]TO

P CO

VER

INTE

RLOC

K SW

ITCH

CLOS

ED (L

) +5V

DC

DC33

0 [1

2-30

0]FR

ONT

DOOR

INTE

RLOC

K SW

ITCH

CLOS

ED (L

) +5V

DCJ851

FINI

SHER

PW

BPL

17.1

3

+5VD

C

+5VD

C

TOP

COVE

RIN

TERL

OCK

SWIT

CH S

IGNA

L

FRON

T DO

ORIN

TERL

OCK

SWIT

CH S

IGNA

L

J891

J891 IN

TLK

ON+2

4VDC

INTL

K ON

+24V

DCP8

92J8

442

4

FINI

SHER

PW

BPL

17.1

3 DC C

OM

FINI

SHER

PWB

PL17

.13

+5VD

C

DC C

OM

B12

B10

J850

VIO

GRY

J866

J866

YEL

J850

DC33

0 [1

2-30

2]DO

CKIN

G IN

TERL

OCK

SENS

ORCL

OSED

(L) +

5VDC

DOCK

ING

INTE

RLOC

KSE

NSOR

SENS

ED S

IGNA

LB1

1+5VD

C

FINI

SHER

PW

BPL

17.1

3

7750

-327

1 3

NOTE

S:Vi

rtual

Lin

eW

hen

an o

verc

urre

nt fl

ows,

the

ther

mis

tor h

as th

e in

tern

alre

sist

ance

incr

ease

to p

rote

ct th

e ci

rcui

t.

TOP

COVE

RIN

TERL

OCK

SWIT

CH

FRON

T DO

ORIN

TERL

OCK

SWIT

CH

DOCK

ING

INTE

RLOC

KSE

NSOR

Page 448: Phaser 7750 Service Manual

11-32 Phaser 7750 Printer Service Manual

Board Communication

DOUB

LEPL

UG

DOUB

LEPL

UG

DOUB

LEPL

UG

3 4 5

5 3 1

5 3 1

72456

J800

BP8

00B

J843

12.2

PW

BS C

OMM

UNIC

ATIO

N

MCU

PW

B13

.1

B13

B12

B11

B9 B16

B16

B20

DC C

OM

YEL

YEL

YEL

YEL

YEL

YEL

YEL

J403

MCU

TO

FINI

SHER

COM

MUN

ICAT

ION

LINE

RETU

RN

DC33

0 [1

2-10

0]RE

GI. C

LUTC

H ON

SIGN

AL

NOT

USED

DC C

OM

DC C

OM

DC C

OM

P800

AJ8

00A

DC C

OM

3 4 5 7 10 9 8

+5VD

C

FINI

SHER

PW

BPL

17.1

3

DC C

OM

1 2 6

J843

J800

BP8

00B

YEL

YEL

YELFINI

SHER

TO

MCU

COM

MUN

ICAT

ION

LINE

FINI

SHER

DETE

CT (L

) +3.

3VDC

RETU

RN

J403

B15

B14

B10

+3.3

VDC

MCU

PW

BPL

13.1

1

1

FINI

SHER

COM

MUN

ICAT

ION

FAIL

SIG

NAL

12.1

1A

8 7 3621

NOTE

: Virtu

al Li

ne

7750

-328

Page 449: Phaser 7750 Service Manual

11-33

Copy and Drive Delivery

1

FINI

SHER

PW

BPL

17.1

3IN

TLK

ON+2

4VDC

RT5

DC C

OM

DC C

OM

10.3

ON

12.1

1A

12.4

12.5

12.5

12.6

12.4

2

B1 B2

J845

DC33

0 [1

2-06

0]PA

PER

TO F

INIS

HER

ON (H

) +24

VDC

DC33

0 [1

2-06

0]PA

PER

TO T

OP T

RAY

ON (H

) +24

VDC

J861

1 2

ORN

BLUJ8

60

DOUB

LEPL

UG

P860

2 112

GATE

INSO

LENO

IDPL

17.4

PAPE

R FR

OM M

/CPA

PER

FROM

M/C

12.3

COP

Y AN

D DR

IVE

DELI

VERY

FINI

SHER

PW

BPL

17.1

3

DC C

OM

B3 A6

IOT

REGI

.CL

UTCH

ON

+5VD

C

J845

J861

3 10

J846

DC C

OM

DC C

OM

3 13 7 5 11 9

DC C

OM

YEL

YEL

ORN

ORN

VIO

VIO

INTL

K ON

+24V

DC

DC33

0 [1

2-00

1] F

INIS

HER

DRIV

E M

OTOR

ON

J879

TRAN

SPOR

T M

OTOR

BRAK

E

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

DC C

OM

DC C

OM

FINI

SHER

DRIV

EM

OTOR

PL17

.71 6 3 2 5 4

MOT

FINI

SHER

DRI

VE

J859

AJ8

59B

VIO

GRY

VIO

GRY

6 4

1 3

DOUB

LEPL

UG

J855

TOP

TRAY

FUL

LSE

NSOR

PL1

7.4

3 12

25

J855 YE

LYE

LJ8

59B

SHOR

TING

PLUG

J859

A9

J861

DC33

0 [1

2-21

5] T

OPTR

AY F

ULL

SENS

ORFU

LL S

ENSE

D(L

) +5V

DCJ8

45A7

FINI

SHER

PWB

PL17

.13

+5VD

CTO

P TR

AYFU

LLSE

NSED

SIGN

AL

H-TR

A RO

LLDR

IVE

PAPE

R TO

H-TR

A

DECU

RLER

ROLL

DRI

VE

EXIT

ROL

LDR

IVE

COM

PILE

PADD

LE D

RIVE 77

50-3

29

NOTE

S:W

hen

an o

verc

urrr

ent f

low

s, th

e th

rerm

isto

r has

the

inte

rnal

resi

stan

cein

crea

se to

pro

tect

the

circ

uit.

Virtu

al L

ine

11

TOP

TRAY

FULL

SEN

SOR

GATE

INSO

LENO

ID

Page 450: Phaser 7750 Service Manual

11-34 Phaser 7750 Printer Service Manual

Horizontal Transportation

DOUB

LEPL

UG

312

H-TR

A IN

TERL

OCK

SENS

OR P

L17.

4

312

H-TR

A EX

IT S

ENSO

RPL

17.4

312

H-TR

A EN

TRAN

CESE

NSOR

PL1

7.4

DOUB

LEPL

UGJ8

56J8

58B

12.1

1A

12.1

1A

12.1

1A

12.5

1

1 1

12.3

12.3

12.4

HOR

IZON

TAL

TRAN

SPOR

TATI

ON

FINI

SHER

PWB

PL17

.13

+5VD

C

+5VD

C

+5VD

C

DC C

OM

DC C

OM

DC C

OM

A1 A3 B8 B6 B5 A5115681315

J845

J861

GRY

VIO

J858

AGR

Y

VIO

GRY

GRY

VIO

VIO

13

31

J853 YE

L

YEL

J858

BJ8

58A

22

P861

14 7 12

SHOR

TING

PLUG

J854

J859

BYE

LYE

L5

2J8

59A

DC33

0 [1

2-10

3]H-

TRA

ENTR

ANCE

SEN

SOR

PAPE

R SE

NSED

(H) +

5VDC

DC33

0 [1

2-10

4]H-

TRA

EXIT

SEN

SOR

PAPE

R SE

NSED

(H) +

5VDC

DC33

0 [1

2-30

5]H-

TRA

INTE

RLOC

KCL

OSED

(L) +

5VDC

J845

FINI

SHER

PW

BPL

17.1

3

+5VD

C

+5VD

C

+5VD

C

H-TR

A EX

ITSE

NSOR

SENS

ED S

IGNA

L

H-TR

A IN

TERL

OCK

SENS

ED S

IGNA

L

H-TR

A EN

TRAN

CESE

NSOR

SENS

ED S

IGNA

L

PAPE

R TO

DECU

RLER

J859

AJ8

59B

GRY

VIO

1 3

6 4

J854

SHOR

TING

PLUG

J853

PAPE

R TO

H-T

RA

H-TR

A RO

LL D

RIVE

A2 A4B7

NOTE

:

1Vi

rtual

Lin

e

7750

-330

ZONE H5

H-TR

A EN

TRAN

CESE

NSOR

H-TR

A IN

TERL

OCK

SENS

OR

H-TR

A EX

ITSE

NSOR H-TR

A RO

LLDR

IVE

ZONE

D5

Page 451: Phaser 7750 Service Manual

11-35

Decurler and Paper Transportation

2

2

3

312

DECU

RLER

CAM

HOM

E SE

NSOR

PL17

.8

12.1

1A

12.6

12.1

1A

12.3

12.3

12.4

312

COM

PILE

REN

TRAN

CE S

ENSO

RPL

17.1

2

4

13 4

2

4

12.5

DEC

URLE

R AN

D PA

PER

TRAN

SPOR

TATI

ON

FINI

SHER

PW

BPL

17.1

3

+5VD

C

DC C

ON

DC C

ON

J849 GR

Y

VIO

J846

RT5

INTL

K ON

+5VD

C

3 1 2 1

DC33

0 [1

2-07

0][1

2-07

1]DE

CURL

ER C

AMCL

UTCH

ON

(L) +

24VD

C BLU

ORN

INTL

K ON

+24V

DC

J880

DOUB

LEPL

UG

P880

DECU

RLER

CAM

CLUT

CHPL

17.7

2 1

2 1

J884

J884

DC33

0 [1

2-21

7]DE

CURL

ER C

AM H

OME

SENS

ORBL

OCKE

D (L

) +5V

DCJ8

49 YEL

2FINI

SHER

PW

BPL

17.1

3

+5VD

CDE

CURL

ER C

AMHO

ME

SENS

ORSE

NSED

SIG

NAL

DECU

RLER

ROL

LDR

IVE

EXIT

ROL

L DR

IVE

PAPE

R TO

DECU

RLER

FINI

SHER

PW

BPL

17.1

3

+5VD

C

DC C

OM

B9 B7

J850

J870

BGR

Y

VIO

GRY

VIO

1 3

6 4

DOUB

LEPL

UG

J870

AJ8

67J8

67 YEL

YEL

J870

AJ8

70B

DOUB

LEPL

UG

52

DC33

0 [1

2-10

1]CO

MPI

LER

ENTR

ANCE

SENS

ORPA

PER

SENS

ED (H

) +5V

DCJ8

50B8

+5VD

C

FINI

SHER

PW

BPL

17.1

3CO

MPI

LER

ENTR

ANCE

SENS

ORSE

NSED

SIG

NAL

DECU

RLER

PAPE

R

7750

-331

Whe

n M

/C p

rovi

des

the

info

that

one

of p

aper

LE

and

TE h

as a

10m

m-o

r-m

ore

uppe

rcu

rl, D

ecur

ler o

pera

tes.

Decu

rler C

am C

lutc

h is

kep

t on

until

the

Decu

rler C

am H

ome

Sens

or is

in th

e “H

” le

vel

(rec

eive

s lig

ht=

in d

esur

l pos

ition

). If

the

sens

or is

in “

L” fr

om th

e be

ginn

ing,

Dec

urle

rdo

esn’

t ope

rate

.

Turn

ing

on [1

2-07

1] le

ads

to th

e op

erat

ion

belo

w:

Fini

sher

Driv

e M

otor

on

+ De

curle

r Cam

Clu

tch

onSt

ops

with

Dec

urle

r Cam

Hom

e Se

nsor

in “

L”.

NOTE

S:W

hen

an o

verc

urre

nt fl

ows,

the

ther

mis

tor h

asth

e in

tern

al re

sist

ance

incr

ease

to p

rote

ct th

eci

rcui

t.

Virtu

al L

ine

EXIT

ROL

L DR

IVE

COM

PILE

R EN

TRAN

CESE

NSOR

DECU

RLER

CAM

CLUT

CHDE

CURL

ER C

AMHO

ME

SENS

OR

Page 452: Phaser 7750 Service Manual

11-36 Phaser 7750 Printer Service Manual

Tamping and Offset

3

1 2 3 4

2 2 2 2

12.8

12.1

1A

12.1

1A

12.1

1B

312

REA

R T

AM

PER

HO

ME

SEN

SO

R P

L17.

10

312

REA

R T

AM

PER

HO

ME

SEN

SO

R P

L17.

10

312

FRO

NT

TAM

PER

HO

ME

SEN

SO

R P

L17.

10

FIN

ISH

ERP

WB

PL1

7.13

12.5

12.3

1 1 1 1

3

12.6

TA

MP

ING

AN

D O

FFS

ET

FIN

ISH

ER P

WB

PL1

7.13

B7

B9

B10

B12 B8

B11

J848 RED

RED

RED

RED

OR

N

OR

N

RT4 T

9IN

TLK

ON

+24V

DC

INTL

K O

N+2

4VD

C

INTL

K O

N+2

4VD

C

DC

330

[12-

091

TO 0

96]

FRO

NT

TAM

PER

MO

TOR

ON

+24

VD

C C

LOC

KD

C33

0 [1

2-09

1 TO

096

]FR

ON

T TA

MP

ER M

OTO

RO

N +

24V

DC

CLO

CK

DC

330

[12-

091

TO 0

96]

FRO

NT

TAM

PER

MO

TOR

ON

+24

VD

C C

LOC

KD

C33

0 [1

2-09

1 TO

096

]FR

ON

T TA

MP

ER M

OTO

RO

N +

24V

DC

CLO

CK

J877

BJ8

77A

DO

UB

LEP

LUG

6 4 3 1 5 2

1 3 4 6 2 5

FRO

NT

TAM

PER

MO

TOR

PL1

7.10

FRO

NT

TAM

PER

DR

IVE

MO

T

ZON

EB

4

FIN

ISH

ER P

WB

PL1

7.13

CO

MP

ILE

PAD

DLE

DR

IVE

INTL

K O

N+2

4VD

C

INTL

K O

N+2

4VD

C

INTL

K O

N+2

4VD

CR

T4

B1

B3

B4

B6

B2

B5

BLU

BLU

BLU

BLU

OR

N

OR

N

DC

330

[12-

010

TO 0

15]

REA

R T

AM

PER

MO

TOR

ON

+24

CLO

CK

DC

330

[12-

010

TO 0

15]

REA

R T

AM

PER

MO

TOR

ON

+24

CLO

CK

DC

330

[12-

010

TO 0

15]

REA

R T

AM

PER

MO

TOR

ON

+24

CLO

CK

DC

330

[12-

010

TO 0

15]

REA

R T

AM

PER

MO

TOR

ON

+24

CLO

CK

DO

UB

LEP

LUG

J848

J878

BJ8

78A

REA

RTA

MP

ERM

OTO

RP

L17.

10 MO

T

REA

RTA

MP

ERD

RIV

E

ZON

EC

4

DEC

UR

LED

PA

PER

CO

MP

ILE

PAD

DLE

DR

IVE

FRO

NT

TAM

PER

HO

ME

SEN

SO

R

ZON

EE3 A

9

A7

A6

A4

A3

A1

+5V

DC

+5V

DC

+5V

DC

DC

CO

M

DC

CO

M

DC

CO

M

J848

J874

GR

Y

GR

Y

GR

Y

VIO

VIO

VIO

J876

J874

ZON

EJ2

CO

MP

ILER

PA

PER

SEN

SO

R

REA

R T

AM

PER

HO

ME

SEN

SO

R

DC

330

[12-

212]

REA

R T

AM

PER

HO

ME

SEN

SO

RH

OM

E (H

) +5

VD

C

J875

J875

DC

330

[12-

102]

CO

MP

ILER

PA

PER

SEN

SO

RPA

PER

SEN

SED

(H

) +5

VD

C

DC

330

[12-

216]

FRO

NT

TAM

PER

HO

ME

SEN

SO

RH

OM

E (H

) +5

VD

C

YEL

YEL

YEL

J876

J848

A8

A5

A2+5

VD

C

+5V

DC

+5V

DC

FIN

ISH

ER P

WB

PL1

7.13

6 4 3 1 5 2

1 3 4 6 2 5

CO

MP

ILED

SET

REA

R T

AM

PER

HO

ME

SEN

SO

RS

ENS

ED S

IGN

AL

4 4 4

CO

MP

ILER

PAP

ER S

ENS

OR

SEN

SED

SIG

NA

L

FRO

NT

TAM

PER

HO

ME

SEN

SO

RS

ENS

ED S

IGN

AL 77

50-3

32

The

Ope

ratio

ns w

ith th

e di

ag c

odes

on:

[12-

010]

: to

fron

t (lo

w s

peed

)[1

2-01

1]: t

o fr

ont (

mid

spe

ed)

[12-

012]

: to

fron

t (hi

gh s

peed

)[1

2-01

3]: t

o re

ar (

low

spe

ed)

[12-

014]

: to

rear

(m

id s

peed

)[1

2-01

5]: t

o re

ar (

high

spe

ed)

The

Ope

ratio

ns w

ith th

e di

ag c

odes

on:

[12-

091]

: to

fron

t (lo

w s

peed

)[1

2-09

2]: t

o fr

ont (

mid

spe

ed[1

2-09

3]: t

o fr

ont (

high

spe

ed)

[12-

094]

: to

rear

(lo

w s

peed

)[1

2-09

5]: t

o re

ar (

mid

spe

ed)

[12-

096]

: to

rear

(hi

gh s

pped

)

Whe

n an

ove

rcur

rent

flow

s, th

eth

erm

isto

r ha

s th

e in

tern

alre

sist

ance

incr

ease

to p

rote

ctth

e ci

rcui

t.

Vir

tual

Lin

e

NO

TES

:

REA

R

TAM

PER

DR

IVE

Page 453: Phaser 7750 Service Manual

11-37

Staple Positioning

1 3

2

STAP

LE M

OVE

SENS

ORPL

17.9

1 3

2

STAP

LEFR

ONT

CORN

ERSE

NSOR

PL17

.9

STAP

LEM

OVE

MOT

ORPL

17.9

12.7

STA

PLE

POSI

TION

ING

FINI

SHER

PW

BPL

17.1

3

+5VD

C

+5VD

C

DC C

OM

DC C

OM

J852

J885

GRY

GRY

VIO

VIO

J850

8 6 A3 A1 5 1 2 6 3 4

INTL

K ON

+24V

DC

RT2

2

1

11

3

3

2 2 2

t 9

J865

J847

J888

1 3 4 6 2 5

DC33

0 [1

2-08

0 TO

083

]ST

APLE

MOV

E M

OTOR

ON +

24VD

C CL

OCK

DC33

0 [1

2-08

0 TO

083

]ST

APLE

MOV

E M

OTOR

ON +

24VD

C CL

OCK

DC33

0 [1

2-08

0 TO

083

]ST

APLE

MOV

E M

OTOR

ON +

24VD

C CL

OCK

DC33

0 [1

2-08

0 TO

083

]ST

APLE

MOV

E M

OTOR

ON +

24VD

C CL

OCK

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

YEL

YEL

YEL

YEL

ORN

ORN

MOT

J865

DC33

0 [1

2-22

4]ST

APLE

MOV

E SE

NSOR

BLOC

KED

(H) +

5VDC

DC33

0 [1

2-22

5]ST

APLE

FRO

NT C

ORNE

R SE

NSOR

CORN

ER S

ENSE

D (H

) +5V

DCYEL

YEL

J852

J850

FINI

SHER

PW

BPL

17.1

3

+5VD

C

+5VD

C

7 A2

STAP

LE M

OVE

SENS

ORSE

NSED

SIG

NAL

3ST

APLE

MOV

ESE

NSOR

SENS

ED S

IGNA

L

12.1

1B

12.1

1B

STAP

LE M

OVE

DRIV

E

STAP

LEM

OVE

SENS

ORST

APLE

FRO

NTCO

RNER

SEN

SOR

Whe

n an

ove

rcur

rent

flow

s th

e th

erm

isto

r has

the

inte

rnal

resi

stan

ce in

crea

se to

pro

tect

the

circ

uit.

The

oper

atio

ns w

ith th

e dr

ag c

odes

on:

[12-

080]

to fr

ont (

high

spe

ed)

[12-

081]

to fr

ont (

low

spe

ed)

[12-

082]

to re

ar (h

igh

spee

d)[1

2-08

3] to

rear

(low

spe

ed)

Virtu

al L

ine

7750

-333

Page 454: Phaser 7750 Service Manual

11-38 Phaser 7750 Printer Service Manual

Staple Control

12.6

STAP

LE H

EAD

HOM

ESE

NSOR

DC C

OM

+5VD

C

STAP

LE R

EADY

SENS

OR

DC C

OM

+5VD

C

LOW

STA

PLE

SENS

OR

DC C

OM

+5VD

C

234

12.1

1B

12.1

1B

12.1

1B12.9

12.8

STA

PLE

CONT

ROL

FINI

SHER

PW

BPL

17.1

3 INTL

K ON

+24V

DCRT

2 t 9

2

7 8 9 10 1 5

DC C

OM

DC C

OM

DC C

OM+5

VDC

+5VD

C

J847 OR

N

ORN

BLU

BLU

YEL

YEL

J852

J886

DC33

0 [1

2-02

0] (C

LOSE

)ST

APLE

MOT

OR C

LOSE

(H) +

24VD

COP

EN (L

) +24

VDC

DC33

0 [1

2-02

0] (C

LOSE

)ST

APLE

MOT

OR C

LOSE

(H) +

24VD

COP

EN (L

) +24

VDC

DC33

0 [1

2-02

1] (O

PEN)

STAP

LE M

OTOR

CLO

SE (H

) +24

VDC

OPEN

(L) +

24VD

CDC

330

[12-

021]

(OPE

N)ST

APLE

MOT

OR C

LOSE

(H) +

24VD

COP

EN (L

) +24

VDC

1

3

3 3

1

GND

GRN

J887

STAP

LE H

EAD

ASSY

PL17

.9

STAP

LEM

OTOR M

OT

1 2 3 4 5 1

COM

PILE

D SE

T

STAP

LEM

OTOR

DC33

0 [1

2-20

7]ST

APLE

HEA

D HO

ME

SENS

ORHO

ME

SENS

ED (L

) +5V

DCJ8

86J8

52YE

L

YEL

YEL

DC33

0 [1

2-20

9]ST

APLE

REA

DY S

ENSO

RRE

ADY

(L) +

5VDC

DC33

0 [1

2-20

8]LO

W S

TAPL

ESE

NSED

(H) +

5VDC

2 3 4

+5VD

C

+5VD

C

+5VD

C

FINI

SHER

PW

BPL

17.1

3

STAP

LED

SET

STAP

LE H

EAD

HOM

ESE

NSOR

SENS

ED S

IGNA

L

STAP

LE R

EADY

SEN

SOR

SENS

ED S

IGNA

L

LOW

STA

PLE

SENS

ORSE

NSED

SIG

NAL

7750

-334

DC33

0 [1

2-02

1] d

oesn

’t op

erat

e w

ith S

tapl

e He

ad H

ome

Sens

or o

n.

Whe

n an

ove

rcur

rent

flow

s, th

e th

erm

isto

r has

the

inte

rnal

resi

stan

ce in

crea

se to

pro

tect

the

circ

uit.

Virtu

al L

ine

NOTE

S:1 2 3

Page 455: Phaser 7750 Service Manual

11-39

Set Eject

3

1 1 1 1

2

1 2 3 4

4 4

3

12.8

12.1

1B

12.1

0A

12.1

1B

SET

CLAM

P HO

ME

SENS

OR P

L17.

8

3 12

EJEC

T CL

AMP

HOM

ESE

NSOR

PL1

7.8

3 12

12.9

SET

EJE

CT

FINI

SHER

PW

BPL

17.1

3

RT3

4 8 10 14 6 12t9

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

INTL

K ON

+24V

DC

J846

BLU

BLU

BLU

BLU

ORN

ORN

ORN

DC C

OMRT

5

A11

A10

t9

J848

BLU

DC33

0[12

-030

to 0

34]

EJEC

T M

OTOR

ON +

24VD

C CL

OCK

DC33

0[12

-030

to 0

34]

EJEC

T M

OTOR

ON +

24VD

C CL

OCK

DC33

0[12

-030

to 0

34]

EJEC

T M

OTOR

ON +

24VD

C CL

OCK

DC33

0[12

-030

to 0

34]

EJEC

T M

OTOR

ON +

24VD

C CL

OCK

J881

EJEC

TM

OTOR

PL17

.81 3 4 6 2 5

MOT

DC33

0 [1

2-04

0][1

2-04

1]SE

T CL

AMP

SOLE

NOID

ON (L

) +24

VDC

J873

B

DOUB

LEPL

UG

J873

A1 2

2 1

FINI

SHER

PWB

PL17

.13

DC C

OM

DC C

OM

+5VD

C

+5VD

C

7 9 4 6

J849

J882

VIO

VIO

GRY

GRY

J883

J882

STAP

LED

SET

EJEC

T RO

LLDR

IVE

ZONE F3

EJEC

T CL

AMP

HOM

E SE

NSOR

SET

CLAM

PHO

ME

SENS

OR

SET

CLAM

PSO

LENO

ID

EJEC

T RO

LLDR

IVE

ZONE E2 DC

330

[12-

211]

SET

CLAM

P HO

ME

SENS

ORHO

ME

(L) +

5VDC

DC33

0 [1

2-21

0]SE

T CL

AMP

HOM

ESE

NSOR

EJE

CTCL

AMP

UP (L

) +5V

DC

YEL

YEL

J849

J883

8 5

+5VD

C

+5VD

C

FINI

SHER

PW

BPL

17.1

3

EJEC

T CL

AMP

HOM

E SE

NSOR

SENS

ED S

IGNA

L

SET

CLAM

P HO

ME

SENS

ORSE

NSED

SIG

NAL

EJEC

TED

SET

7750

-335

The

oper

atio

ns w

ith th

e di

ag c

odes

on:

[12-

30]:

Forw

ard

Rota

tion

On[1

2-31

]: Ba

ckw

ard

Rota

tion

On[1

2-32

]: Ej

ect C

lam

p Lo

w D

own

[12-

33]:

Ejec

t Cla

mp

Mid

Dow

n[1

2-34

]: Ej

ect C

lam

p Up

The

oper

atio

n w

ith [1

2-04

1] o

n:Ej

ect M

otor

For

war

d Ro

tatio

n On

+ S

et C

lam

pSo

leno

id O

nSet

Cla

mp

mak

es o

ne ro

tatio

n be

fore

stop

ping

. (Ru

n [1

2-03

2] E

ject

Cla

mp

Low

Dow

n in

adva

nce.

)

Whe

n an

ove

rcur

rent

flow

s, th

e th

erm

isto

r has

the

inte

rnal

resi

stan

ce in

crea

se to

pro

tect

the

circ

uit.

Virtu

al L

ine

NOTE

S:

SET

CLAM

PSO

LENO

IDPL

17.8

Page 456: Phaser 7750 Service Manual

11-40 Phaser 7750 Printer Service Manual

Stacker Tray Control

UP

DOW

N

STAC

K HE

IGHT

SENS

OR P

L17.

6

312

STAC

K HE

IGHT

SENS

OR P

L17.

6

312

DOUB

LEPL

UG

25

DOUB

LEPL

UG

22

33

2

12.1

1B

12.1

1B

DOUB

LEPL

UG

DOUB

LEPL

UG43 1

6

13 1

3

DOUB

LEPL

UG

13 1

3

12.9

12.1

0A S

TACK

ER T

RAY

CONT

ROL

(1 O

F 2)

FINI

SHER

PWB

PL17

.13

B6 B4 B3 B1

+5VD

C

+5VD

C

DC C

OM

DC C

OM

J850 GR

Y

GRY

VIO

GRY

VIO

VIO

GRY

VIO

J871

BJ8

71A

J870

BJ8

70A

J868

J869

EJEC

TED

SET

J869 YE

LJ8

71A

EJEC

TED

SET

J868

J870

AYE

LYE

L

YEL

J870

BJ8

50

DC33

0 [1

2-20

1]ST

ACK

HEIG

HT S

ENSO

RBL

OCKE

D (H

) +5V

DC

DC33

0 [1

2-20

0]ST

ACK

PAPE

R SE

NSOR

PAPE

R SE

NSED

(H) +

5VDC

J871

B

B5 B2

+5VD

C

+5VD

C

FINI

SHER

PW

BPL

17.1

3

STAC

K HE

IGHT

SENS

ORSE

NSED

SIG

NAL

STAC

K PA

PER

SENS

ORSE

NSED

SIG

NAL

STAC

K HE

IGHT

SENS

OR

STAC

K PA

PER

SENS

ORST

ACKE

R TR

AYDR

IVE

STAC

KER

MOT

ORPL

17.1

1J8

89P8

89

MOT

J847 OR

N

BLU

DC33

0 [1

2-05

0]ST

ACKE

R M

OTOR

UP (H

) +24

VDC

DC33

0 [1

2-05

1]ST

ACKE

R M

OTOR

DOW

N (H

) +24

VDC

11 12

DC C

OM

RT3

t9

FINI

SHER

PW

BPL

17.1

3 INTL

K ON

+24V

DC1

1

23

Whe

n an

ove

rcur

rren

t flo

ws,

the

ther

mis

tor h

as th

ein

tern

al re

sist

ance

incr

ease

to p

rote

ct th

e ci

rcui

t.

NOTE

S:St

ack

Heig

ht S

enso

r Det

ectio

nH:

blo

cks

light

(The

det

ecte

d le

vel i

s hi

gher

than

the

refe

renc

e.)

L: re

ceiv

es li

ght (

The

dete

cted

leve

l is

low

er th

an th

e re

fere

nce.

)W

hen

H ch

ange

s to

L, t

he s

tack

has

reac

hed

the

refe

renc

e he

ight

.

Virtu

al L

ine

7750

-336

Page 457: Phaser 7750 Service Manual

11-41

Stacker Tray Control (cont’d)

UPPE

R LI

MIT

SENS

ORPL

17.1

13 1

2

STAC

K A

SENS

ORPL

17.1

13 1

2

STAC

K B

SENS

ORPL

17.1

13 1

2

FINI

SHER

PWB

PL17

.13

DC C

OM

DC C

OM

DC C

OM

+5VD

C

+5VD

C

+5VD

C

A10

A12

A7 A9 A4 A6

J850

J862

VIO

VIO

VIO

GRY

GRY

GRY

J862

J863

J863

J864

J8642

1

3 3 3

2

1

2

3

DC33

0 [1

2-20

4]ST

ACK

A SE

NSOR

BLOC

KED

(H) +

5VDC

DC33

0 [1

2-20

2]UP

PER

LIM

IT S

ENSO

RLI

MIT

SEN

SED

(H) +

5VDC

DC33

0 [1

2-20

5]ST

ACK

B SE

NSOR

BLOC

KED

(H) +

5VDC

YEL

YEL

YEL

J850

FINI

SHER

PW

BPL

17.1

3

+5VD

C

+5VD

C

+5VD

C

A11

A8 A5

UPPE

R LI

MIT

SENS

ORSE

NSED

SIG

NAL

STAC

K A

SENS

ORSE

NSED

SIG

NAL

STAC

K B

SENS

ORSE

NSED

SIG

NAL

12.1

1B

12.1

1B

12.1

1B

12.1

0B S

TACK

ER T

RAY

CONT

ROL

(2 O

F 2)

UPPE

R LI

MIT

SEN

SOR

STAC

K A

SENS

OR

STAC

K B

SENS

OR

A5 L

EFB5

LEF

A4 L

EF8.

5X11

LEF

16K

LEF

Post

Car

d SE

FB6

SEF

A6 S

EFA5

SEF

B5 S

EFA4

SEF

B4 S

EFA3

SEF

5.5X

8.5

SEF

8X10

SEF

8.5X

11 S

EF8.

5X13

SEF

8.5X

14 S

EF8K

SEF

11X1

7 SE

F12

X18

SEF

12.6

X18

SEF

X10

0010

0010

0010

00 X X X X X10

0050

050

0 X10

0010

0050

050

050

050

0 X X

X 50 50 50 50 X X X X X 50 50 50 X 50 50 50 50 50 50 X X

pape

r size

pape

r qty

set q

ty

Stac

ker T

ray

can

hold

the

follo

win

g:NO

TES:

X: u

nava

ilabl

e

Virtu

al L

ine

OFF

ON ON OFF

OFF

OFF

ON ON

0-30

0 sh

eets

300-

500

shee

ts50

0-10

00 s

heet

sOv

er 1

000

shee

ts

STAC

KA

SENS

ORST

ACK

B SE

NSOR

Capa

city

The

com

bina

tion

of S

tack

A S

enso

r and

Sta

ck B

Sen

sor s

tate

sde

term

ines

the

qty

of p

aper

she

ets

to b

e he

ld.

ON: b

lock

s lig

htOF

F: re

ceiv

es li

ght

7750

-337

Page 458: Phaser 7750 Service Manual

11-42 Phaser 7750 Printer Service Manual

Finisher Service Parts List

PL 17.1 Finisher

Page 459: Phaser 7750 Service Manual

11-43

Finisher PL 17.1

No. Part Number Qty Description

1 116-1292-00 1 Gate Cover

2 116-1280-01 1 H-Transport Assembly

3 Staple Finisher

4 116-1821-00 Thumbscrew

5 Rack Assembly

6 116-1244-00 1 Right Cover

7 116-1278-00 1 Stacker Tray

8 116-1279-00 1 Screw

9 Bracket

10 Front Bracket

11 Stud Screw

12 Rear Bracket

Page 460: Phaser 7750 Service Manual

11-44 Phaser 7750 Printer Service Manual

PL 17.2 Gate Assembly

Gate Assemblies PL 17.2

No. Part Number Qty Description

1 116-1292-00 Gate Cover

2 Bearing

3 116-1293-00 Gate Assembly {items 4 - 14}

4 In Gate

5 In Gate Lever

6 116-1294-00 Gate Bracket

s7750-405

Page 461: Phaser 7750 Service Manual

11-45

PL 17.3 Horizontal Transport Assembly: 1 of 2

H-Transport Assembly: 1 of 2 PL 17.3

No. Part Number Qty Description

1 116-1290-00 H-Transport Cover Assembly

3 116-1291-00 Magnet

4 Screw

6 116-1246-00 Roll

9 116-1289-00 Entrance Upper Cover Assembly

13 116-1821-00 Thumbscrew

14 116-1259-00 Front Cover

15 116-1261-00 Upper Rear Cover

16 116-1263-00 Rear Cover

s7750-406

Page 462: Phaser 7750 Service Manual

11-46 Phaser 7750 Printer Service Manual

PL 17.4 Horizontal Transport Assembly: 2 of 2

Horizontal Transport Assembly: 2 of 2 PL 17.4

No. Part Number Qty Description

1 H-Transport Roll (in)

2 H-Transport Roll (out)

3 116-1284-00 1 H-Transport Belt

4 Roll

5 Support

6 1 Bearing

7 Harness Guide

8 Cover

9 116-1644-00 Entrance Sensor

s7750-407

Page 463: Phaser 7750 Service Manual

11-47

10 116-1285-00 Top Tray Full Sensor

11 116-1247-00 Exit Sensor

12 116-1286-00 Gate In Solenoid Assembly

13 Gate in Solenoid

14 Spring {p/o item 12}

15 Link

16 Cover

17 Ground Wire

18 Wire Harness

19 Wire Harness

20 Bearing

21 116-1281-00 Gear (37T)

22 116-1282-00 Gear (30T)

23 116-1283-00 Gear (26T)

24 116-1234-00 Interlock Sensor

25 Bracket

26 116-1267-00 Paper Guide

27 Roll

28 Bracket

29 Frame

30 Bracket

31 Screw

Horizontal Transport Assembly: 2 of 2 PL 17.4

No. Part Number Qty Description

Page 464: Phaser 7750 Service Manual

11-48 Phaser 7750 Printer Service Manual

PL 17.5 Covers

s7750-408

Page 465: Phaser 7750 Service Manual

11-49

Covers PL 17.5

No. Part Number Qty Description

1 116-1238-00 Front Cover

2 116-1239-00 Rear Cover

3 116-1236-00 Top Cover

4 116-1237-00 Left Cover

5 116-1245-00 Front Cover Door

6 Left Panel

7 Hinge N/S

8 116-1844-00 Magnet

Page 466: Phaser 7750 Service Manual

11-50 Phaser 7750 Printer Service Manual

PL 17.6 Top Cover and Eject Roll

s7750-409

Page 467: Phaser 7750 Service Manual

11-51

Top Cover and Eject Roll PL 17.6

No. Part Number Qty Description

1 116-1262-00 1 Top Open Cover Assembly

2 Arm

3 Bearing

4 Bracket

5 Spring

6 Support

7 Bracket

8 Shaft

9 116-1302-00 1 Eject Pinch Roll

10 116-1823-00 1 Eject Chute

11 116-1272-00 1 Stack Height Sensor Assembly

12 1 Actuator

13 Bracket

14 116-1253-00 1 Stack Height Sensor

15 Shaft

16 Link

17 116-1264-00 1 Actuator

18 116-1258-00 Clutch

19 Collar

20 116-1848-00 1 Gear (28Z) part of a kit

21 Eject Roll

22 116-1848-00 1 Gear (20T) part of a kit

23 Bearing

24 Eject Shaft

25 116-1302-00 1 Eject Roll Assembly

26 Link

27 Static Eliminator

28 Collar

Page 468: Phaser 7750 Service Manual

11-52 Phaser 7750 Printer Service Manual

PL 17.7 Paper Transport: 1 of 2

s7750-410

Page 469: Phaser 7750 Service Manual

11-53

Paper Transport: 1 of 2 PL 17.7

No. Part Number Qty Description

1 116-1248-00 1 Actuator Cam

2 116-1249-00 1 Clutch Assembly, Decurler Cam

3 Cam

4 Shaft

5 Bearing

6 116-1250-00 1 Arm

7 116-1302-00 1 Decurler Roll

8 116-1847-00 1 Gear (40Z / 20T) - part of a kit

9 116-1847-00 1 Gear (40Z) - part of a kit

10 116-1847-00 1 Gear (18Z / 21T) - part of a kit

11 Shaft

12 Bearing

13 116-1847-00 1 Gear (23Z / 52Z) - part of a kit

14 116-1265-00 1 Belt

15 116-1242-00 1 Belt

16 116-1241-00 1 Finisher Drive Motor

17 Bracket

Page 470: Phaser 7750 Service Manual

11-54 Phaser 7750 Printer Service Manual

PL 17.8 Paper Transport: 2 of 2

s7750-411

Page 471: Phaser 7750 Service Manual

11-55

Paper Transport: 2 of 2 PL 17.8

No. Part Number Qty Description

1 116-1266-00 1 Cam Bracket Assembly

2 116-1847-00 1 Pully - part of a kit

3 116-1847-00 1 Gear (15Z) - part of a kit

4 116-1271-00 1 Belt

5 116-1847-00 1 Gear (30Z) - part of a kit

6 Collar

7 116-1847-00 1 Gear Pully - part of a kit

8 Eject Motor

9 116-1847-00 1 Cam Gear - part of a kit

10 116-1847-00 1 Gear (42Z / 27Z) - part of a kit

11 Set Clamp Solenoid

12 Bracket

13 Wire Harness

14 116-1234-00 1 Home Sensor

15 Plate

16

17

18 Bracket

19 Stop

20 Spring

Page 472: Phaser 7750 Service Manual

11-56 Phaser 7750 Printer Service Manual

PL 17.9 Staple Unit Assembly

s7750-412

Page 473: Phaser 7750 Service Manual

11-57

Staple Unit Assembly PL 17.9

No. Part Number Qty Description

1 116-1255-00 1 Carriage Assembly (Item 2-6)

2 Bracket Assembly

3 116-1256-00 1 Staple Move Motor

4 Gear

5 Staple Sensor

6 Roll

7 116-1259-00 1 Staple Front Corner Sensor

8 Plate

9 116-1254-00 1 Rail (REP 17.9.1)

10 116-1257-00 1 Stapler Assembly (Item 11.12) (REP 17.9.2)

11 Stapler

12 Cartridge

13 Bracket

14 Stapler Harness

Page 474: Phaser 7750 Service Manual

11-58 Phaser 7750 Printer Service Manual

PL 17.10 Compiler Tray Assembly

s7750-413

Page 475: Phaser 7750 Service Manual

11-59

Compiler Tray Assembly PL 17.10

No. Part Number Qty Description

1 116-1251-00 1 Compiler Tray Assembly (Item 2-15)

2 116-1252-00 1 Front/Rear Tamper Motor Assembly

3 Plate

4 116-1253-00 1 Front /Rear Tamper Home Sensor

5 Rack

6 Actuator

7 Tamper

8 Finger

9 Spring

10 116-1234-00 1 Compiler Paper Sensor

11 Actuator

12 116-1845-00 Paper Guide

13 116-1269-00 1 Spring

14 Wire Harness

15 End Guide

Page 476: Phaser 7750 Service Manual

11-60 Phaser 7750 Printer Service Manual

PL 17.11 Stacker Elevator Assembly

s7750-414

Page 477: Phaser 7750 Service Manual

11-61

Stacker Elevator Assembly PL 17.11

No. Part Number Qty Description

1 116-1287-00 1 Stacker Motor Assembly

2 116-1276-00 1 Front Elevator Bracket

3 Clamp

4 Bearing

5 116-1274-00 1 Gear (Rear)

6 Actuator

7 116-1275-00 1 Gear (Front)

8 Stacker Tray Bracket Assembly

9 116-1273-00 1 Rack

10 Tray Guide

11 116-1270-00 1 Paper Stack Assembly (Item 12-16)

12 116-1253-00 1 Sensor

13 Actuator

14 Bracket

15 Spring

16 Cover

17 Bracket

18 116-1253-00 Upper Limit /Stack A /Stack B Sensor

19 Bracket

20 Pin

21 Bearing

22 Shaft

23 Rivot

Page 478: Phaser 7750 Service Manual

11-62 Phaser 7750 Printer Service Manual

PL 17.12 Exit Assembly

s7750-415

Page 479: Phaser 7750 Service Manual

11-63

Exit Assembly PL 17.12

No. Part Number Qty Description

1 Gear (48Z)

2 Bearing

3 116-1243-00 1 Exit Shaft

4 Collar

5 Gear (32Z / 18T)

6 Bearing

7 116-1304-00 1 Paddle Gear Shaft (REP 17.12.1)

8 Paddle Bearing

9 Lower Exit Chute

10 116-1302-00 1 Pinch Roll (Exit 1)

11 Pinch Roll (Exit 2)

12 Pinch Roll (Exit 3)

13 Upper Exit Chute

14 116-1240-00 1 Compiler Entrance Sensor

15 Plate Spring

16 Bracket

17 Static Eliminator

Page 480: Phaser 7750 Service Manual

11-64 Phaser 7750 Printer Service Manual

PL 17.13 Electrical Components

s7750-416

Page 481: Phaser 7750 Service Manual

11-65

Electrical Components PL 17.13

No. Part Number Qty Description

1 Board Cover

2 116-1235-00 1 Finisher Board

3 116-1314-00 1 ROM

4 PWB Bracket

5 116-1824-00 DC Harness

6 116-1825-00 Cable

7 116-1233-00 1 Top Cover/Front Door Interlock Switch

8 116-1253-00 1 Docking Interlock Switch

9 Spring Plate

10 Bracket

11 Plate

Page 482: Phaser 7750 Service Manual

11-66 Phaser 7750 Printer Service Manual

PL 17.14 Finisher Rack (Stand)

s7750-417

Page 483: Phaser 7750 Service Manual

11-67

7.14 Finisher Rack (Stand)

No. Part Number Qty Description

1 116-1315-00 Front Rack

2 1 Front Cover

3 1 Knob Screw

4 Screw

5 Bracket

6 Stop

7 1 Spring Plate

8 1 Rail

9 Foot

10 Front Rack

11 116-1316-00 Rear Rack Assembly

12 Rear Cover

13 Rear Rack

14 Bracket

15 Bottom Plate

Page 484: Phaser 7750 Service Manual

11-68 Phaser 7750 Printer Service Manual

Page 485: Phaser 7750 Service Manual

AAppendix

AppendixContents...■ Menu Map

■ Service Diagnostic Menu Map

■ Service Usage Profile Status Code Definitions Table

■ Chain-Link Code Definitions

■ Paper Weight Equivalence Table

Page 486: Phaser 7750 Service Manual

A-2 Phaser 7750 Printer Service Manual

Menu Map

Front Panel Buttons:Main Menu: Up ArrowOK

InformationBack

Cancel

Down Arrow

InformationWalk-Up FeaturesPrinter SetupTroubleshooting

InformationWalk-Up FeaturesPrinter SetupTroubleshooting

READY TO PRINT.READY TO PRINT.

Walk-Up Features*

Information

Printer Setup

Menu Map

Printer Identification

Information Pages

Sample Pages

Supplies Info

Configuration Page

Connection Setup

Page 1 of 2

DN, GX, or DXf configurationTray 3, 4, 5FinisherStored jobs of this type present

***

*******

Requires:

Proof Print Jobs****

Saved Print Jobs****

Secure Print Jobs****

Walk-Up Printing

Select for Installation

Graphics Demonstration

Office Demonstration

2-Sided Demonstration*

CMYK Sampler Pages

RGB Sampler Pages

Model

Printer Name

Print Server*

IP Address*

Serial #

Activation Date

Supplies Usage Page

Cyan Toner Life

Magenta Toner Life

Yellow Toner Life

Black Toner Life

Imaging Unit 1 Life

Imaging Unit 2 Life

Imaging Unit 3 Life

Imaging Unit 4 Life

Fuser Life

Waste Cartridge Life

Belt Cleaner Assembly Life

Transfer Roller Life

Staple Cartridge Life***

Reset Transfer Roller Life

Reset Belt Cleaner Assembly Life

Total Print Count

TCP/IP

DHCP/BOOTP

AutoIP

TCP/IP Address

TCP/IP Network Mask

TCP/IP Gateway

Port 9100

LPR

IPP

SLP

SSDP

CentreWare IS

Help Guide

Configuration Page

Paper Tips Page

Supplies Usage Page

Connection Setup Page

Moving Guide

Startup Page

Usage Profile

PostScript Font List

PCL Font List

Connection Setup Page

Network Setup*

USB Setup

Reset Connection Setup

TCP/IP Setup

NetWare Setup

Ethernet Speed

EtherTalk

NetWare

IPX Frame Type

USB Port

Wait Timeout

Page Description Language

= prints an information page.

Page 487: Phaser 7750 Service Manual

A-3

Printer Setup

Paper Handling Setup

Calibration Setup

PostScript Setup

PCL Setup

Front Panel Setup

Printer Controls

File Security

Troubleshooting

Help Guide

Paper Jams

Print Quality Problems

Network Log Pages*

Service Tools

Page 2 of 2

(continued)

DN, GX, or DXf configurationTray 3, 4, 5FinisherStored jobs of this type present

***

*******

Requires:

Paper Tips Page

Online Jam Prevention GuideTroubleshooting Print Quality

Page

Color Test Pages

Solid Fill Pages

Repeating Defects Page

Remove Print Smears

Printer Status Page

Engine Error History

Jam History

Service Usage Profile

Email Service Report*

Reset NVRAM

NetWare Start Log

NetWare Runtime Log

TCP/IP Start Log

TCP/IP Runtime Log

AppleTalk Start Log

AppleTalk Runtime Log

PostScript Error Info

Print-Quality Mode

TekColor Correction

Image Smoothing

Reset PostScript Setup

Calibrate for Paper

Calibrate Colors

Calibrate Margins

Font Number

Pitch

Point Size

Symbol Set

Orientation

Form Length

Line Termination

Reset PCL Setup

Startup Page

Power Saver Timeout

Low Toner Warning Level

Fuser Warning Point

Imaging Unit Warning Point

Date and Time

Intelligent Ready

Metric Defaults

Power Saver

Printing Optimization

Reset Printer Controls

Front Panel Language

Front Panel Sound

Front Panel Brightness

Front Panel Contrast

Accessible Front Panel

Reset Front Panel Setup

Paper Source

2-Sided Printing*

Tray 1 (MPT) Setup

Tray 2 Setup

Tray 3, 4, 5 Paper Type**

Load Paper Timeout

Tray Sequence**

Custom Units

Paper Destination***

Job Offset

Stapling Options***

Cancel After Jams

Reset Paper Handling Setup

Overwrite Removals

Remove Job Files*

Daily Removal*

Remove At HH:MM*

Reset File Security

Page 488: Phaser 7750 Service Manual

A-4 Phaser 7750 Printer Service Manual

Service Diagnostic Menu Map

Service Diagnostics Menu Map

Print Service Menu Map Prints a service diagnostic menu map and exits service diagnostics.

General Status Provides the current print engine status.

Engine ROM VersionConfigurationAmbient Temp/HumidityFuser TemperatureFault ListFront Panel AdjustJam InfoFault History

Built-in Test Prints Prints Test Prints. The prints are used by service personnel to identify, repair, and validate the operability of the printer.

Paper Path OptionsPrint Laser CheckPrint HalfTonesPrint Grid 1-DotPrint Fast Scan 8 tone

Sensor/Switch Tests Test the functionality of sensors and switches by giving service personnel the ability to input actuation and state changes of all sensors and switches.

Ambient Temp/HumidityFuser TemperatureInterlocksJam SensorsPOB SensorRegistration SensorOHP SensorDuplex SensorTray Feed SensorsStack Full SensorFuser Exit Sensor1st BTR Retract Sensor2nd BTR Retract SensorFuser PresentRead Fuser FusesAccum MOB SensorBelt Edge SensorBTR SensorsADC SensorToner Waste CartridgeTray SensorsTray 1 SensorsATC SensorsImaging Unit SensorsNew Toner Cartridge SensorsFinisher Sensors (optional)

Motors/Fans Tests Tests the functionality of motors and fans by giving service personnel the ability to energize/de-energize the motor and fans one at a time.

Main MotorSteering MotorImaging Unit Motors Accumulator Belt Motor

Motor Test (-cont’d-) 1st BTR Motor

2nd BTR MotorDuplex MotorPaper Feed MotorsPaper Lift MotorsOffset MotorDeveloper MotorsDispenser MotorsAgitator MotorFan MotorsPaper Path / No PickFinisher Motors (optional)

Clutch Tests Tests the functionality of the clutches by giving service personnel the ability to energize/de-energize one clutch at a time.

Take Away ClutchDeveloper ClutchRegistration ClutchDuplex ClutchFinisher Clutches (optional)

Solenoid Tests Tests the functionality of the solenoids by giving service personnel the ability to energize/de-energize one solenoid at a time.

Exit Gate SolenoidDuplex Gate SolenoidShutter SolenoidADC Shutter OpenADC Shutter CloseTray 1 Feed SolenoidFinisher Solenoids (optional)

Adjustments/Calibrations Performs adjustments, calibrations and operations essential to the performance of the printer.

Belt Edge LearnATC Sensor SetupTRC AdjustADC Output CheckTone Up/DownLaser Power CheckPWM Mapping Data ReadCoarse RegiCon Init

Maintenance Cleans the IDT rollers within the Imaging Unit.

Clean FuserClean Accumulator Belt

NVRAM Access This menu lets you read, set, or reset the following values:

PostScript NVRAM ResetClear Tech Rep FaultsReset CRU Life CountersReset Engine NVRAMStore Engine NVRAM

Exit Exits service diagnostics and reboots the printer.

For Authorized Service Personnel Use Only. Service Menu functions are to be used by Xerox service personnel and authorized service providers only. The printer can be damaged by improper use of the built-in service tests.

Page 489: Phaser 7750 Service Manual

A-5

Service Usage Profile Status Codes

Code Definition Code Definition

0 Ready 20 Tray 2 missing, not printing from 2

1 Accumulator near end of life 21 Tray 1 missing, not printing from 1

2 Fuser near end of life 22 Stapler not ready

3 Belt cleaner near end of life 23 Stapler near empty

4 Transfer roller near end of life 24 Stapler empty

5 Waste toner cartridge is getting full

25 Stapler Cartridge empty

6 Cyan toner is getting low 26 Job not stapled

7 Magenta toner is getting low 27 IP address is being used by someone else

8 Yellow toner is getting low 28 Processing Data

9 Black toner is getting low 29 Receiving Data

10 Imaging Unit 1 is near end of life 30 Engine is printing

11 Imaging Unit 2 is near end of life 31 Progress printing page n

12 Imaging Unit 3 is near end of life 32 Progress printing page n of n

13 Imaging Unit 4 is near end of life 33 Progress cleaning page n

14 No paper tray 4, not printing from 4

34 Progress cleaning page n of n

15 No paper tray 3, not printing from 3

35 Thermals unstable

16 No paper tray 2, not printing from 2

36 Initializing mech

17 No paper tray 1, not printing from 1

37 Clearing job

18 Tray 4 missing, not printing from 4

38 Cancelling cleaning job

19 Tray 3 missing, not printing from 3

39 Printer in cleaning mode

20 Tray 2 missing, not printing from 2

40 In Energy Star mode

Page 490: Phaser 7750 Service Manual

A-6 Phaser 7750 Printer Service Manual

41 Stapler not ready 66 No laser paper HC tray 2,

42 Top Cover Interlock open 67 No heavy paper HC tray 2,

43 Finisher Front Door open 68 No laser paper tray 3, printing

44 HT Interlock Sensor open 69 No heavy paper tray 3, printing

45 Docking Interlock open 70 No laser paper HC tray 3,

46 Stapler near empty 71 No heavy paper HC tray 3,

47 Finisher tray fail 72 No laser paper tray 4, printing

48 Finisher at capacity 73 No heavy paper tray 4, printing

49 job not stapled 74 No laser paper HC tray 4,

50 Finisher full 75 No heavy paper HC tray 4,

51 Finisher paper size change 76 No OHP in MPT

52 IOT Output Tray Full 77 No heavy paper in MPT

53 No paper, standard tray 4 78 No color laser labels in MPT

54 No paper tray 3, printing from 3 79 No envelopes in MPT

55 No paper tray 2, printing from 2 80 No thin cover/index in MPT

56 No paper tray 1, printing from 1 81 No thick cover/index in MPT

57 No paper, high capacity trays 82 No laser paper in MPT

58 No paper, high capacity trays 83 No paper in MPT

59 No paper, high capacity trays 84 OHP in MPT, needs labels

60 No laser paper tray 1, printing 85 OHP in MPT, needs heavy paper

61 No thin cover index tray 1, 86 OHP in MPT, needs envelope

62 No heavy paper tray 1, printing 87 OHP in MPT, needs thin

63 No OHP tray 1, printing from 1 88 OHP in MPT, needs thick

64 No laser paper tray 2, printing 89 OHP in MPT, needs paper

65 No heavy paper tray 2, printing 90 Paper in MPT, needs OHP

Code Definition Code Definition

Page 491: Phaser 7750 Service Manual

A-7

91 Tray 4 missing, printing from 4 116 OHP detected in tray 4, high

92 Tray 3 missing, printing from 3 117 Front door open

93 Tray 2 missing, printing from 2 118 Left door open

94 Tray 1 missing, printing from 1 119 Upper left door open

95 HC trays, tray 4 missing 120 Lower left door open

96 HC trays, tray 3 missing 121 Lower tray door open

97 HC trays, tray 2 missing 122 Lower high capacity tray door open

98 Cyan toner empty 123 Right door open

99 Magenta toner empty 124 Jam at output tray

100 Yellow toner empty 125 Jam at fuser unit

101 Black toner empty 126 Jam at multi-purpose tray

102 Imaging Unit 1 at end of life 127 Jam at tray 1

103 Imaging Unit 2 at end of life 128 Jam at tray 2

104 Imaging Unit 3 at end of life 129 Jam at tray 3

105 Imaging Unit 4 at end of life 130 Jam at tray 4

106 Accumulator belt is at end of life 131 Jam at duplex

107 Waste toner cartridge is full 132 Jam at tray 4, high capacity trays

108 Belt cleaner assembly is at end of life

133 Jam at tray 2, high capacity trays

109 Transfer roller is at end of life 134 Jam at tray 3, high capacity trays

110 OHP detected in tray, but paper is selected

135 Jam at door A

111 OHP detected in tray 2 136 Jam at door B

112 OHP detected in tray 3 137 Jam at door C, high capacity trays

113 OHP detected in tray 4 138 Jam at door C, low capacity trays

114 OHP detected in tray 2, high 139 HT Exit sensor on jam

115 OHP detected in tray 3, high 140 HT Entrance jam

Code Definition Code Definition

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A-8 Phaser 7750 Printer Service Manual

140 HT Entrance jam 165 AutoSelect Needs Paper

141 Compiler exit sensor off jam 166 AutoSelect Needs Heavy

142 Tray 1 Needs Paper 167 AutoSelect Needs Thin

143 Tray 1 Needs Heavy 168 AutoSelect Needs Thick

144 Tray 1 Needs Thin 169 AutoSelect Needs Trans

145 Tray 1 Needs Trans 170 AutoSelect Needs Envelopes

146 Tray 2 Needs Paper 171 AutoSelect Needs Labels

147 Tray 2 Needs Heavy 172 Size Mismatch, Load Letter

148 Tray 3 Needs Paper 173 Size Mismatch, Load Legal

149 Tray 3 Needs Heavy 174 Size Mismatch, Load Statement

150 Tray 4 Needs Paper 175 Size Mismatch, Load Executive

151 Tray 4 Needs Heavy 176 Size Mismatch, Load Tabloid

152 Tray 2 HC Needs Paper 177 Size Mismatch, Load TabloidEx

153 Tray 2 HC Needs Heavy 178 Size Mismatch, Load 8x10

154 Tray 3 HC Needs Paper 179 Size Mismatch, Load Foolscap

155 Tray 3 HC Needs Heavy 180 Size Mismatch, Load US Folio

156 Tray 4 HC Needs Paper 181 Size Mismatch, Load Postcard

157 Tray 4 HC Needs Heavy 182 Size Mismatch, Load A3

158 MPT Needs Paper 183 Size Mismatch, Load A4

159 MPT Needs Heavy 184 Size Mismatch, Load A5

160 MPT Needs Thin 185 Size Mismatch, Load A6

161 MPT Needs Thick 186 Size Mismatch, Load RA3

162 MPT Needs OHP 187 Size Mismatch, Load SRA3

163 MPT Needs Envelopes 188 Size Mismatch, Load SP Folio

164 MPT Needs Labels 189 Size Mismatch, Load Oficio

Code Definition Code Definition

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A-9

190 Size Mismatch, Load B4 JIS 212 Fuser Missing

191 Size Mismatch, Load B5 JIS 213 Fuser Life Expired / fuser at end of life

192 Size Mismatch, Load B6 JIS 214 Accumulator Belt Missing

193 Transparency Size Mismatch, Load Letter

215 System halt, service call required

194 Transparency Size Mismatch, Load A4

216 Laser Failure

195 Label Size Mismatch, Load Letter

217 Polygon Motor Failure

196 Label Size Mismatch, Load A4 218 Accumulator home position took too long

197 Envelope Size Mismatch Load 10 Comm

219 Accumulator Home Position Failure

198 Envelope Size Mismatch, Load 9 Half

220 Accumulator Edge Sensor Fail

199 Envelope Size Mismatch, Load B4

221 Drum Motor Fail

200 Envelope Size Mismatch, Load B5

222 Unexpected Accumulator Home Sensor Fail

201 Envelope Size Mismatch, Load B6

223 Accumulator Drive Logic Fail

202 Envelope Size Mismatch, Load C4

224 Imaging Unit 1 Communications Failure

203 Envelope Size Mismatch, Load C5

225 Imaging Unit 2 Communications Failure

204 Envelope Size Mismatch, Load C6

226 Imaging Unit 3 Communications Failure

205 Envelope Size Mismatch, Load DL

227 Imaging Unit 4 Communications Failure

206 Output Tray Full 228 Transfer Roller Contact Failure

207 Imaging Unit 1 Missing 229 Transfer Roller Retract Failure

208 Imaging Unit 2 Missing 230 Fuser Main Lamp Failure

209 Imaging Unit 3 Missing 231 Fuser STS Front Failure

210 Imaging Unit 4 Missing 232 Fuser STS Front Warm Time Fail

211 Waste Cartridge Missing 233 Fuser SSR1 Fail

Code Definition Code Definition

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A-10 Phaser 7750 Printer Service Manual

235 Fuser STS Rear Fail 260 Finisher Error 119

236 Fuser STS Rear Warm Time Fail

261 Finisher Error 120

237 Fuser SSR2 Fail 262 Finisher Error 121

238 Fan Fail 263 Finisher Error 122

239 Waste Toner Sensor Fail 264 Finisher Error 123

240 Yellow ATC Fail 265 Finisher Error 124

241 Magenta ATC Fail 266 Finisher Error 125

242 Cyan ATC Fail 267 Number of opcodes

243 Black ATC Fail

244 Engine Logic Board Fail

245 Engine Comm Fail

246 Engine RAM ROM Fail

247 Engine NVRAM Fail

248 Controller to Engine Timing Fail

249 Engine Micro Pitch Fail

250 HV Power Supply Fail

251 Tray Lift Fail

252 Finisher Error 111 -

253 Finisher Error 112

254 Finisher Error 113

255 Finisher Error 114

256 Finisher Error 115

257 Finisher Error 116

258 Finisher Error 117

259 Finisher Error 118

Code Definition Code Definition

Page 495: Phaser 7750 Service Manual

A-11

Missing Chain Link Codes Definitions

04-605 IOT NVM EMPTY

07-270 TRAY 2 PAPER SIZE SENSOR BROKEN

07-271 TRAY 3 PAPER SIZE SENSOR BROKEN

07-272 TRAY 4 PAPER SIZE SENSOR BROKEN (3TM)

07-273 TRAY 5 PAPER SIZE SENSOR BROKEN (3TM)

07-274 MPT PAPER SIZE SENSOR BROKEN

07-276 TRAY 4 PAPER SIZE SENSOR BROKEN (TTM)

07-277 TRAY 5 PAPER SIZE SENSOR BROKEN (TTM)

07-930 TRAY 2 PAPER SIZE MISMATCH

07-931 TRAY 3 PAPER SIZE MISMATCH

07-932 TRAY 4 PAPER SIZE MISMATCH

07-933 TRAY 5 PAPER SIZE MISMATCH

08-620 ENVIRONMENT TEMP SENSOR FAIL

08-900 STATIC JAM

Page 496: Phaser 7750 Service Manual

A-12 Phaser 7750 Printer Service Manual

Paper Weight Equivalence Table

US Postcard thickness

(mm)

US Bond Weight

(lbs)

US text book

weight (lb)

US cover weight

(lb)

US Bristol weight

(lb)

US Index weight

(lb)

US tag weight

(lb)

Metric weight

(g/m2)

16 41 22 27 33 37 60

17 43 24 29 35 39 64

20 50b 28 34 42 46 75

21 54 30 36 44 49 80

24 60b 33 41 50 55 90

27 68 37 45 55 61 100

28 70b 39 49 58 65 105

29 74 41 50 61 68 110

32 80b 44 55 67 74 120

36 90 50 62 75 83 135

0.18 39 100 55 67 82 91 148

40 101 55 68 83 92 150

0.20 43 110 60 74 90 100 163

45 115 63 77 94 104 170

0.23 47 119 65 80 97 108 176

51 128 70 86 105 117 190

53 134 74 90 110 122 199

54 137 75 93 113 125 203

58 146 80 98 120 133 216

65 165 90 111 135 150 244

Page 497: Phaser 7750 Service Manual

Service Manual Index – 1

IndexSymbols(HCF) Tray 3

removal, 8-59(HCF) Tray 4 and Paper Transport

disassembly, 8-59+24 VDC - 1 of 2

wiring diagram, 10-29+24 VDC Interlock Circuit

troubleshooting, 4-19+24VDC 2 of 2

wiring diagram, 10-30+5 VDC Interlock Circuit

troubleshooting, 4-20

Numerics1st Retract contact motor

service diagnostics, 4-924 VDC Low-Voltage Power Supply

disassembly, 8-462nd BTR Motor

diagnostic test, 4-92nd BTR Retract Sensor

diagnostic test, 4-63.3 VDC

disassembly, 8-445 VDC

disassembly, 8-44

AAC Power

disassembly, 8-48troubleshooting, 4-16

Accumulator Beltdisassembly, 8-34home position failure (code 31), 3-19home position took too long (code

30), 3-19

unexpected belt edge sensor failure (code 32), 3-22

unexpected home sensor signal (code 33), 3-24

Accumulator Belt Drivedisassembly, 8-50

Accumulator Belt Motordiagnostic test, 4-9

Accumulator Belt Mounting Framedisassembly, 8-33

Accumulator Belt Sensormark-on-belt (mob) diagnostic test,

4-6ADC Output Check

diagnostic test, 4-12ADC Sensor

diagnostic test, 4-7output check, 2-26theory of, 2-25

ADC Shutter Closediagnostic test, 4-11

ADC Shutter Opendiagnostic test, 4-11

adjustments, 6-1ATC sensor setup, 6-14center skew, 6-4coarse and fine skew, 6-3fine skew, 6-7in/out skew, 6-3Regicon procedures, 6-5

adjustments/ calibrationsdiagnostic tests, 4-11

Agitator Motordiagnostic test, 4-10

applicationtroubleshooting, 4-23

ATC Sensorblack failure (code 15), 3-15cyan failure (code 14), 3-13

Page 498: Phaser 7750 Service Manual

Phaser 7750 Printer Index – 2

diagnostic test, 4-7magenta failure (code 13), 3-13setup adjustment, 6-14theory of, 2-24yellow failure (code 12), 3-13

ATC Sensor Setupdiagnostic test, 4-11

BBelt Cleaner

disassembly, 8-34Belt Edge Learn

diagnostic test, 4-11Belt Edge Sensor

diagnostic test, 4-6blank prints

troubleshooting, 5-14BTR Sensor

diagnostic test, 4-7

Ccalibrations, 6-1Card Cage

disassembly, 8-40center setup

theory of, 2-19center skew, 6-4Chain Link

definition of, 3-5definitions of, 3-5index table, 3-10

charge and exposurewiring diagram, 10-62

charging, 2-2Clean Accumulator Belt

diagnostic test, 4-12clean fuser

diagnostic test, 4-12cleaning, 2-2, 7-1clear tech rep faults, 6-20

diagnostics, 4-12clearance, 1-9Clutch Tests

diagnostics, 4-11

coarse initialization, 6-12Coarse RegiCon initialization

diagnostics, 4-12coarse skew, 6-3Color Registration Control

wiring diagram, 10-43configuration

diagnostics, 4-3consumables

diagram, 1-8life counters, 1-8

Controller to engine communications failure (code 81), 3-39CRU Life Counters

diagnostics, 4-12

Ddamaged prints

troubleshooting, 4-21DC Power Generation +24VDC

wiring diagram, 10-36DC Power Generation 3.3 VDC

disassembly, 10-34DC Power Generation 5VDC

wiring diagram, 10-35Developer Clutch

diagnostic test, 4-11Developer Drive

disassembly, 8-51Developer Housing Assembly

disassembly, 8-25Developer Motor

diagnostic test, 4-10development, 2-2dimensions, 1-9DIP Switches, 4-3Dispense Assembly

disassembly, 8-20Dispensor Motor

diagnostic test, 4-10Doors

troubleshooting, 4-15Drives

theory of, 2-11Drum Drive Control

Page 499: Phaser 7750 Service Manual

Service Manual Index – 3

wiring diagram, 10-59Drum Drive Control K

wiring diagram, 10-60Drum Life Control

wiring diagram, 10-61Drum Motor

failure (code 60), 3-35Duplex Chute

disassembly, 8-13Duplex Clutch

diagnostic test, 4-11Duplex Gate Solenoid

diagnostic test, 4-11Duplex Motor

diagnostic test, 4-9Duplex Sensor

diagnostic test, 4-6duplexing

paper path, 2-7

EElectrical Chassis (Card Cage)

disassembly, 8-40electrical specifications, 1-12Engine control

theory of, 2-10Engine Control Board

communications failure (code 81), 3-39

controller to time failure (code 84), 3-40

disassembly, 8-42micro pitch failure (code 85), 3-40NVRAM failure (code 83), 3-40NVRAM failure (code 86), 3-40RAM/ROM failure (code 82), 3-39

Engine control board failure (code 80), 3-39Engine Control Interface Board

disassembly, 8-43Engine NVRAM

reset, 6-20engine ROM version

diagnostics, 4-3environmental specifications, 1-13

error messagesindex table, 3-10

Exit Gate Solenoiddiagnostic test, 4-11

exit jamstroubleshooting, 4-22

Exit Transportdisassembly, 8-31

exposure, 2-2

FFan failure (code 54), 3-33Fan Tests

diagnostics, 4-8fault history

accessing, 3-2service diagnostic, 4-4

fault listdiagnostics, 4-3

fine skewtheory of, 2-19

FinisherClutches

diagnostic tests, 4-11communication failure (code 124),

3-61motors

diagnostic test, 4-10Solenoids

diagnostic tests, 4-11troubleshooting, 4-15

Finisher Decurlerfailure (code 122), 3-59

Finisher Eject Clamphome sensor on/off failure (code 120/

121), 3-58Finisher Sensors

diagnostic tests, 4-8Finisher Set Clamp

failure (code 123), 3-60Finisher Stacker Height Sensor

off failure (code 116), 3-53Finisher Stacker Tray

failure (code 117), 3-55Finisher Stapler

Page 500: Phaser 7750 Service Manual

Phaser 7750 Printer Index – 4

failure (code 113), 3-49front corner on/off failure (code 118/

119), 3-57mode logic failure (code 125), 3-61move sensor on/off failure (code 111/

112), 3-47front panel

adjust, diagnostics, 4-3configuration, 1-6disassembly, 8-5key shortcuts, 1-6keys, 1-6LED indicators, 1-6troubleshooting, 4-14

functional specifications, 1-12Fuser

diagnostic temperature, 4-3life expectancy, 2-8main lamp failure (code 40), 3-25paper path, 2-8SSR2 on-time failure (code 47), 3-31STS front failure (code 41), 3-26STS front warm time failure (code

42), 3-26STS rear failure (code 45), 3-30STS rear warm time failure (code

46), 3-31sub lamp failure (code 44), 3-29theory of, 2-8

Fuser Exit Sensordiagnostic test, 4-6

Fuser Fandisassembly, 8-32

Fuser Fan Motordiagnostic test, 4-10

Fuser jamstroubleshooting, 4-22

Fuser Present Sensordiagnostic test, 4-6

Fuser Temperature Sensordiagnostic test, 4-5

fusing, 2-3

HHard Drive, 6-15

HCF Sensordiagnostic test, 4-7

HCF/LTA Coverdisassembly, 8-58

IImage Processor Board

board diagram, 1-7connections, 1-7disassembly, 8-38

Imaging Unitcommunications failure (code 70, 71,

72, 73), 3-36Imaging Unit Drive

disassembly, 8-52Imaging Unit Motor

service diagnostics, 4-9Imaging Unit Plate Assembly

disassembly, 8-22Imaging Unit Plate Cover

disassembly, 8-19Imaging Unit Rail Assembly

disassembly, 8-24Imaging Unit Sensor

diagnostic test, 4-7in/out setup

theory of, 2-19in/out skew, 6-3Interlocks

diagnostic tests, 4-5Internal Hard Drive

disassembly, 8-39Inverter Transport Assembly

disassembly, 8-14

JJam info

diagnostics, 4-4Jam Sensors

diagnostic tests, 4-6

LLaser Control Y

Page 501: Phaser 7750 Service Manual

Service Manual Index – 5

wiring diagram, 10-40Laser Power Check

diagnostic test, 4-12Laser Scan Drive Control

wiring diagram, 10-41Laser Shutter Control

wiring diagram, 10-42Laser Unit

laser unit failure (code 10), 3-12polygon motor failure (code 11),

3-12theory of, 2-15

Laser Unit (ROS)disassembly, 8-36

LD Power Relaydisassembly, 8-45

LEDPOST blink patterns, 3-8

Left Cover Assembly (Left Door)disassembly, 8-11

Left Hand Lift Jackdisassembly, 8-55

Left-Hand and Right-Hand Gear (HCF)disassembly, 8-62

Left-Hand Lower Coverdisassembly, 8-8

Left-Hand Rear Mid Coverdisassembly, 8-7

loading and feedingtray 1, 2-6

Low-Voltage Power Suppliesdisassembly, 8-44

LTA Rear Coverdisassembly, 8-57

LTA Right Side Doordisassembly, 8-57

LTA/HCF Coverdisassembly, 8-58

LVPS Controlwiring diagram, 10-33

MMacintosh

troubleshooting, 4-23Main Drive

disassembly, 8-49Main Lever

disassembly, 8-54Main Motor

diagnostic test, 4-8Main Motor Drive Control

wiring diagram, 10-39Main Power

wiring diagram, 10-31Main Power 2 of 2

wiring diagram, 10-32maintenance

diagnostic test, 4-12Mark-On-Belt (MOB) Sensor

disassembly, 8-30media jams

troubleshooting, 4-21media specifications, 1-13Mis-pick

troubleshooting, 4-21Motor Tests

diagnostics, 4-8multiple sheet pick

troubleshooting, 4-21

NNVRAM

resetting, 6-16storing, 6-21

NVRAM Accessdiagnostics, 4-12

OOffset Motor

diagnostic test, 4-10OHP Sensor

diagnostic test, 4-6operating system

troubleshooting, 4-23Optional Feeder

troubleshooting, 4-15

Page 502: Phaser 7750 Service Manual

Phaser 7750 Printer Index – 6

PPaper Feed Motor LTA/HCF

disassembly, 8-61Paper Feed Motors

diagnostic test, 4-9paper feed sensing, 2-5Paper Feeding

wiring diagram, 10-54Paper Lift Motor

diagnostic test, 4-9disassembly, 8-17

Paper on Belt (POB) Sensordiagnostic test, 4-6

Paper Pathservice diagnostic tests for, 4-4theory of, 2-4troubleshooting, 4-21

Paper Path/No Pick Motordiagnostic test, 4-10

Paper Pick RollersTray 1 disassembly, 8-10

paper present sensing, 2-6paper size sensing, 2-5Paper Transportation

wiring diagram, 10-55Paper-Select Switches, LTA/HCF

disassembly, 8-60Plug Jack Locator Maps, 10-10POST, 3-7

diagnostic test descriptions, 3-9fault reporting, 3-8faults, 3-8LED blink patterns, 3-8startup indications, 3-7

PostScript NVRAM Reset, 6-16diagnostics, 4-12

powerAC and DC, 2-10

Power Interlock Switchingwiring diagram, 10-37

Power Supplysystem theory of, 2-13

primary transfer, 2-2Print Cartridge Motor

diagnostic test, 4-9print process

summary of, 2-2print quality

overview, 5-2print quality defects

specific components, 5-2print speeds, 1-12printer

configurations, 1-3dimensions and clearances, 1-9electrical specs, 1-12environmental specs, 1-13exterior parts, 1-4functional spec, 1-12general troubleshooting, 4-15media specs, 1-13print speeds, 1-12specifications, 1-9start up, 3-7tray specs, 1-13

printer maintenance, 7-1printer orientation, 8-2

RRead Fuser Fuses Sensor

diagnostic test, 4-6Rear Cover

disassembly, 8-6Regicon

center skew #3, 6-9coarse initialization, 6-12coarse skew #4, 6-10fine skew #1, 6-7in/out skew #2, 6-8overview, 2-17patterns, 2-20theory of, 2-15

Registrationwiring diagram, 10-58

Registration Clutchdiagnostic test, 4-11

Registration Control (Regicon), 6-2Registration Sensor

diagnostic test, 4-6Registration Transport Assembly

disassembly, 8-15

Page 503: Phaser 7750 Service Manual

Service Manual Index – 7

Reset Engine NVRAMdiagnostics, 4-12

resettingall printer defaults, 6-17clear tech rep faults, 6-20factory settings, 6-16NVRAM, 6-16

resetting NVRAM, image processor, 6-16restore

factory settings, margins, 6-17previous color settings, 6-16

Right Hand Lift Jackdisassembly, 8-55

Right Side Coverdisassembly, 8-4

RIP Procedures, 3-4ROS

overview, 2-15rough skew

theory of, 2-19Routine Maintenance Items

diagram, 1-8

Ssecondary transfer, 2-3Sensors

diagnostic tests, 4-5theory of, 2-22

service checklist, 3-3Service Diagnostics

entering, 4-2front panel key description, 4-3menu, tests table, 4-3NVRAM Resets, 6-19overview, 4-2

service menu map, 4-3Shutter Solenoid

diagnostic test, 4-11Shutter Solenoid Assembly

disassembly, 8-16Solenoid Tests

diagnostic test, 4-11Stack Full Sensor

diagnostic test, 4-6stack height sensing, 2-6

Startup, 3-7Steering Drive

disassembly, 8-29Steering Motor

diagnostic test, 4-9Store Engine NVRAM

diagnostics, 4-13storing

engine NVRAM, 6-21System boot sequence, 3-7

TT2 High-Voltage Power Supply

disassembly, 8-47Take-Away Clutch

diagnostic test, 4-11temperature/humidity

diagnostics, 4-3Temperature/Humidity Sensor

diagnostic test, 4-5Test Prints

color test pages, 5-5fast scan 8 tone, 5-11front panel, 5-4grid-1 dot, 5-10paper path options, 5-9print fast scan 8 tone

diagnostics, 4-5print grid 1-dot

diagnostics, 4-5print halftones, 5-10

diagnostics, 4-5print laser check, 5-9

diagnostics, 4-5remove print smears, 5-8repeating defects page, 5-8service diagnostic, 4-4solid fill pages, 5-7test pattern, 5-6

theory of operation, 2-1Tone Up/Down

diagnostic test, 4-12toner

EA theory of, 2-9Toner Dispense Motor

Page 504: Phaser 7750 Service Manual

Phaser 7750 Printer Index – 8

disassembly, 8-28Toner Waste Cartridge

diagnostic test, 4-7Top Cover

disassembly, 8-5Top Rear Cover

disassembly, 8-7Transfer Roller

contact failure (code 20), 3-17retract failure (code 21), 3-17

Transfer Roller Sensordiagnostic test, 4-7

Traylift failure (code 87), 3-41

Tray 1 (MPT)size sensor error (code), 3-43

Tray 1 (MPT) Feed Solenoiddiagnostic test, 4-11

Tray 1 (MPT) Sensordiagnostic test, 4-7

Tray 1 / (MPT)disassembly, 8-9

Tray 1 Feederdisassembly, 8-17

Tray 1 Paper Size switchingwiring diagram, 10-44

Tray 1 Paper Stackingwiring diagram, 10-49

Tray 2 Paper Size Switchingwiring diagram, 10-45

Tray 2 Paper Stackingwiring diagram, 10-50

Tray 2 Paper-Select Switchesdisassembly, 8-53

Tray 3 Paper Size Sensingwiring diagram, 10-46

Tray 3 Paper Stackingwiring diagram, 10-51

Tray 4 Paper Size Sensingwiring diagram, 10-47

Tray 4 Paper Stackingwiring diagram, 10-52

Tray 5 Paper Stackingwiring diagram, 10-53

tray feed sensorsdiagnostic test, 4-6

tray lift failure (code 87), 3-41tray module paper transport drive control

wiring diagram, 10-57tray module paper transportation

wiring diagram, 10-56tray module power interlock switching

wiring diagram, 10-38tray sensor

diagnostic test, 4-7tray specifications, 1-13trays

troubleshooting false load message, 4-15

troubleshooting missing, 4-15TRC Adjust

diagnostic test, 4-11troubleshooting

background contamination, 5-22banding, 5-19light prints all colors, 5-13missing bands, 5-16one color faded or missing, 5-15print is mottled, 5-25random missing spots, 5-21repetitive marks, 5-20spotting, 5-19streaks, 5-17toner on back of print, 5-24unfused image, 5-23

troubleshooting procedureshow to use, 3-5

WWaste Auger

disassembly, 8-35Waste Cartridge Sensor Holder

disassembly, 8-18Waste Toner Cartridge

full detection sensor failure (code 78), 3-38

Wiring Diagrams, 10-29

Page 505: Phaser 7750 Service Manual

071-0864-00 A