ServiceGeneral Di470

8/9/2019 ServiceGeneral Di470

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Di470

[General]

Service Manual


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The Optional Accessories used with the Di470 are comm

Di450/Di550.

Please refer to Di450/Di550 Option Service Manual for t

sories.


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INDEX (GENERAL)

MECHANICAL/ELECT

GENERAL


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GENERAL


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CONTENTS

1. SPECIFICATION ......................................................................

2. PRECAUTIONS FOR INSTALLATION .....................................

2-1. Installation Site .................................................................2-2. Power Source ...................................................................

2-3. Grounding .........................................................................

3. PRECAUTIONS FOR USE .......................................................

3-1. To ensure that the copier is used in an optimum condition

3-2. Operating Environment .....................................................

3-3. Power Requirements ........................................................

3-4. Note ..................................................................................

4. HANDLING OF CONSUMABLES .............................................

5. OTHER PRECAUTIONS ..........................................................

6. SYSTEM OPTIONS ..................................................................


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1. SPECIFICATION

TYPE

ORIGINAL SCANNING SYSTEMPHOTOCONDUCTOR

COPYING SYSTEM

RESOLUTION

PAPER FEEDING SYSTEM

EXPOSURE SYSTEM

DEVELOPING SYSTEM

CHARGING SYSTEM

IMAGE TRANSFER SYSTEM

PAPER SEPARATING SYSTEM

:

::

:

:

:

:

:

:

:

:

Console

Lens Reduction Type CCD LineOrganic Photoconductor

Electrostatic Dry Powdered Ima

Paper

600 dpi × 600 dpi

4-Way system (for U.S.A)

Multi Bypass Table: 50 sheets o

1st Drawer (Universal): 550 she2nd Drawer (Universal): 550 sh

3rd Drawer: 2600 sheets of pap

4-Way system (for other)


1st Drawer (Universal): 500 she

2nd Drawer (Universal): 500 sh

3rd Drawer: 2500 sheets of pap

5-Way system (for U.S.A)




3rd Drawer: 550 sheets of pape

4th Drawer: 550 sheets of pape

5-Way system (for other)




3rd Drawer: 500 sheets of pape

4th Drawer: 500 sheets of pape

Mirror Scanning, Slit Exposure

New Micro-Toning System

Comb Electrode DC Negative CScorotron System

Visible Image Transfer by mean

DC Negative Corona with Corot

AC Corona with Corotron Syste


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COPY MEDIUM❍: Permissible -: Not permissible C: Crosswise

*1: 20 sheets or less

CONTINUOUS COPY SPEED (copies/minute) Fed from 1st Drawer/M

47 Copies per minute

Paper Source1st to 2nd

Drawer

4WAY

(LCC)

5WAY

(3rd to 4th)

M

By

Ta

M e d i u m

Plain paper

(60 to 90 g/m2)❍ ❍ ❍

Translucent

paper– – – ❍

Transparencies – – – ❍

Thick paper

(90 to 157 g/m2)– – – ❍

Recycled paper ❍ ❍ ❍ ❍

D i m e n

s i o n s

Maximum

(Width ×

Length)

297 × 432

mmA4C

297 × 432

mm

297

m

11-3/

In

Minimum

(Width ×

Length)

140 × 182

mm

8-1/2 × 11 C

Inch

210 × 280

mm

100

m

4 ×

In

MULTIPLE COPIESWARMING-UP TIME

FIRST COPY TIME

::

:

1 to 99999 seconds or less

A4C / LetterC: 4.0 second or le

(in Full size Mode using 1st Dr

Area Zoom Ratio Size ×1.000 Area Zoom Ra

Metric

A3L

A4L

A4C

B4L

28

36

47

32

Inch

11 × 1

8-1/2 ×

8-1/2 ×

8-1/2 ×


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ZOOM RATIOS

MAX.POWER CONSUMPTION (Copier only)

ENVIRONMENTAL CONDITIONS

Fixed

Area Mode Metric

Full Size ×1.000

Reduction

×0.816

×0.707

×0.500

Enlargement

×1.154

×1.414

×2.000

Variable 25 % to 400 % (in 0.1 % increm

LENS

EXPOSURE LAMP

FUSING TEMPERATURE

:

:

:

Through Lens (F = 4.0, f = 62

Rare Gas Fluorescent Light (2

190 °C

Voltage

Exposure Heater

Lamp

(Rating)

Fusing Heater

Lamp

(Rating)

Max. Power C

sumption

(Full System

115 V

120 V24 V

20 W

120 V

Upper: 850 W

Sub: 400 WLower: 200 W

1430 W ± 10

220 V

240 V

230 V

Upper: 1011 W

Sub: 400 W

Lower: 400 W

1700 W ± 10

POWER REQUIREMENTS : 120 V, 127 V, 220-240 V; 50/60

COPIER DIMENSIONS : Width .... 664 mm (26-1/4 inch

D th 768 (30 1/4 i h


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2. PRECAUTIONS FOR INSTALLATION

2-1. Installation Site

To ensure safety and utmost performance of the copier, the copier sho

place:• Where it will be subjected to extremely high or low temperature or h

• Where it will be subjected to sudden fluctuations in either temperatu

• Which is exposed to direct sunlight.

• Which is in the direct air stream of an air conditioner, heater, or ven

• Which has poor ventilation or is dusty.

• Which does not have a stable, level floor or where it will receive und

• Which is near any kind of heating device.• Which is near volatile flammables (thinner, gasoline, etc.).

• Where it may be splashed with water.

• Which puts the operator in the direct stream of exhaust from the co

• Where ammonia gas might be generated.

2-2. Power Source

• If any other electrical equipment is sourced from the same power o

the capacity of the outlet is not exceeded.

• Use a power source with little voltage fluctuation.

• Never connect by means of a multiple socket any other appliances

outlet being used for the copier.

• Ensure that the copier does not ride on the power cord or communi

electrical equipment, and that it does not become wedged into or un

nism.

• Make the following checks at frequent intervals:

✽ Is the power plug abnormally hot?

✽ Are there any cracks or scrapes in the cord?

✽ Has the power plug been inserted fully into the outlet?

✽ Does something, including the copier itself, ride on the power cord?

Use an outlet with a capacity of 115/120 V, 15 A or more. 200-220 V,

2-3. Grounding

• Always ground the copier to prevent receiving electrical shocks in th

leakage.

C t th d i t th d t i l f th tl t


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3. PRECAUTIONS FOR USE

3-1. To ensure that the copier is used in an optim

• Never place a heavy object on the copier or subject the copier to sh

• Insert the power plug all the way into the outlet.• Do not attempt to remove any panel or cover which is secured while

copies.

• Do not turn OFF the copier while it is making copies.

• Provide good ventilation when making a large number of copies con

• Never use flammable sprays near the copier.

• If the copier becomes inordinately hot or produces abnormal noise,

unplug it.• Do not turn ON the power switch at the same time when you plug th

outlet.

• When unplugging the power cord, do not pull on the cord; hold the

• Do not bring any magnetized object near the copier.

• Do not place a vase or vessel containing water on the copier.

• Be sure to turn OFF the power switch at the end of the workday or u

• Use care not to drop paper clips, staples, or other small pieces of m

3-2. Operating Environment

The operating environmental requirements of the copier are as follows

• Temperature: 10 to 32 °C

• Humidity: 15 to 85 %

• Rate of temperature change: 10 °C/h

• Rate of humidity change: 10 %/h

3-3. Power Requirements

The power source voltage requirements are as follows.

• Voltage fluctuation: AC 115, 120, 220, 240 V

± 10 % (copying performance assured)

(paper feeding performance assured)

• Frequency fluctuation: 50/60 Hz ± 0.3 Hz

3-4. Note

+10 %-15 %


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4. HANDLING OF CONSUMABLES

Before using any consumables, always read the label on its container

• Paper can be easily damaged by dampness. To prevent absorption

paper, which has been removed from its wrapper but not loaded in tsealed plastic bag in a cool, dark place.

• Keep consumables out of the reach of children.

• Do not touch the PC Drum with bare hands.

• The same sized paper is of two kinds, short grain and long grain. S

should only be fed through the copier crosswise, long grain paper s

lengthwise.

• If your hands become soiled with toner, wash them with soap and w

• Do not throw away any used consumables (PC Drum, starter, toner,

collected.

• Do not burn, bury in the ground, or throw into the water any consum

starter, toner, etc.).

• Do not store consumables in a place which:

✽ Is hot and humid.

✽ Is subject to direct sunlight.

✽ Has an open flame nearby.

5. OTHER PRECAUTIONS

Use the following precautions when performing service jobs for a copi

• When a service job needs to be performed in the laser beam path, s

around the printerhead or PC Drum, be sure first to unplug the pow

from the outlet.• If the job requires that the power cord be left plugged in, observe th

tions.

• Take off your watch, ring and any other reflective object and wear la

gles.

• Keep users away from the job site.

1. Do not bring a highly reflective tool into the laser beam path during


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6. SYSTEM OPTIONS

4002G50

4002G501AA

4002G504AA

4002G503AA

4002G505AA

1

4002G507AA

4002G508A

5

3, 4

2

13

6

1145M035AA

4002O101AA

14

15


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MECHANICAELECTRICAL


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CONTENTS

1. CROSS SECTIONAL VIEW .....................................................

2. COPY PROCESS .....................................................................

3. DRIVE SYSTEM .......................................................................4. SEQUENTIAL EXPLANATION .................................................

5. IMAGE STABILIZATION SYSTEM ...........................................

5-1. AIDC Sensor .....................................................................

5-2. Image Stabilization System Control ..................................

6. PC DRUM SECTION ................................................................

6-1. PC Drum Drive Mechanism ..............................................

6-2. Grounding of the PC Drum ...............................................

7. PC DRUM CHARGING SECTION ............................................

8. IMAGE READING SECTION ....................................................

8-1. Exposure Components Section ........................................

8-2. Exposure Lamp Control ....................................................

8-3. Image Processing Process ...............................................

8-4. Image Density Control ......................................................(1) Auto Exposure Control .............................................

(2) Manual Exposure Control .........................................

8-5. Scanner and Mirrors Carriage Movement Mechanism .....

(1) Scanner Movement Mechanism ...............................

(2) 2nd/3rd Mirrors Carriage Movement Mechanism .....

8-6. Scanner Motor Drive Control ............................................

9. MEMORY SECTION .................................................................

9-1. Image Processing Process ...............................................

10. Original Size Detecting Section ................................................

10-1.Original Size Detecting Operation ....................................

10-2.Original Size Detecting Sensors Locations ......................

10-3.Original Size Detection .....................................................

10-4.Original Size Detection Timing .........................................11. PH SECTION ............................................................................

11-1.Image Processing Process ...............................................

11-2.Laser Emission Timing (SOS Signal) ...............................

12. DEVELOPING UNIT SECTION ................................................


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12-13.Sub Hopper Toner Empty Detecting Mechanism ...........

13. PAPER TAKE UP/FEED SECTION ..........................................

13-1.Drawer In Position Detection ............................................

13-2.Paper Empty Detection Mechanism .................................

13-3.Drawer Paper Lifting/Lowering Mechanism ......................13-4.Paper Level Detection Mechanism ...................................

13-5.Universal Tray Paper Size Detection Mechanism ............

13-6.Paper Take Up Mechanism ..............................................

(1) Paper Separating Mechanism ..................................

(2) Paper Pressure Release Mechanism .......................

(3) Paper Take Up Roller Retracting Mechanism ..........13-7.Paper Take Up Control .....................................................

(1) Paper Take Up Motor Control ...................................

(2) Paper Take Up Retry Control ...................................

(3) Paper Take Up Interval Control ................................

(4) Double Feed Paper Take Up Control .......................

13-8.Vertical Transport Drive Mechanism ................................

14. MANUAL FEED TABLE SECTION ...........................................14-1.Manual Take Up Roller Pressure Mechanism ..................

14-2.Manual Feed Paper Separating Mechanism ....................

14-3.Manual Feed Paper Empty Detection Mechanism ...........

14-4.Manual Feed Take Up Control .........................................

15. TRANSPORT/SYNCHRONIZING ROLLERS SECTION ..........

15-1.Paper Dust Remover ........................................................15-2.Transport Roller Drive Mechanism ...................................

15-3.Synchronizing Roller Drive Mechanism ............................

16. IMAGE TRANSFER AND PAPER SEPARATION SECTION ...

16-1.PC Drum Paper Separator Fingers Section .....................

(1) Finger Pressing Detection Mechanism .....................

(2) Finger Back and Forth Detection Mechanism ..........

17. PC DRUM CLEANING SECTION .............................................

17-1.Cleaning Blade Moving Mechanism .................................

17-2.Toner Conveying/Collecting Mechanism ..........................

18. MAIN ERASE SECTION ...........................................................

19 TRANSPORT SECTION


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22-3.Turnover Roller Separation Control ..................................

22-4.Turnover/Exit Mechanism .................................................

(1) Selection of Turnover or Exit Path ............................

(2) Path for Accommodating Paper Longer Than A4L ...

23. OTHER MECHANISM ..............................................................23-1.Memory Backup ................................................................

23-2.Flash Memory ...................................................................

23-3.Dehumidifying Mechanism ...............................................

(1) PC Drum Dehumidifying ...........................................

(2) Paper Dehumidifying Mechanism .............................

23-4.Cooling Mechanism ..........................................................(1) IR Section Cooling Mechanism ................................

(2) Fusing Section Cooling Mechanism .........................

(3) Copier Interior Cooling Mechanism ..........................

(4) Power Supply Section Cooling Mechanism ..............


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1. CROSS SECTIONAL VIEW

1. Fusing Section2. IR Section3. PH Section

4. Developing Sectio5. Paper Tray6. Exit/Turnover Sec

1

6

4002M5


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2. COPY PROCESS

1. PC Drum Used as the medium on which a visible developed image of the orig2. Drum Charging• A uniform negative DC charge is deposited across the entire surfac3. Photoelectric Conversion• CCD converts the image data represented by light reflected off the

sponding electrical signal which, in turn, is output to IR image-proce4. IR Image-Processing• The electrical signal is converted to an 8-bit digital image signal (A/

in turn, goes through appropriate correction before being output to t5. Memory• The digital image signal is compressed and stored in memory. It is t

image-processing section.6 PH Image Processing

1. PC Drum

11. ImageTransfer

12. PaperSeparation15. Transport

14. MainErase

2. Drum Charging

7. LExp

5. Memory4. IR Image-Processing

13. Cleaning

16. Fusing17. Exit/Turnover Switching

18. Turnover 19. Duplex Unit

3. PhotoelectricConversion

6. PHProc


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10. Bypass Paper Feeding• Paper is fed from the Bypass Table.11. Image Transfer• A DC positive corona emission is applied to the back side of the pap

toner onto the surface of the paper.12. Paper Separation• An AC corona and a DC negative corona emission is applied to the

paper to neutralize the paper, while the PC Drum Paper Separator Fremove the paper from the surface of the PC Drum.

13. Cleaning• Residual toner on the surface of the PC Drum is scraped off.14. Main Erase• Light is directed to the surface of the PC Drum to neutralize any surf

ing there after cleaning.15. Transport• The paper is fed to the Fusing Unit.16. Fusing• The developed image is permanently fused to the paper by a comb

pressure applied by the Upper and Lower Fusing Rollers.17. Exit/Turnover Switching• The paper is either fed out onto the Exit Tray or into the turnover me18. Turnover• The 1-sided copy is turned over and fed into the Duplex Unit.19. Duplex Unit• The 1-sided copies are fed through this unit before being subjected

cycle.


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3. DRIVE SYSTEM

1. Fusing Motor (M2)

2. PC Drum Drive Motor (M21)3. Scanner Motor (M51)4. Developing Unit Drive Motor (M1)5. Upper Vertical Transport / Manual

Feed Motor (M6)6 1st Drawer Paper Take Up Motor (M4)

8. 1st Drawer Lift-Up

9. 2nd Drawer Lift-U10. 2nd Drawer Paper11. Transport Roller M12. Synchronizing Ro13. Turnover Motor (M14 Cleaning Web Dri

1 2

10111213

14

connect


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4. SEQUENTIAL EXPLANATION

Power Supply Unit Cooling Fan Motor 1(M16)

Power Supply Unit Cooling Fan Motor 2(M15)

Suction Fan Motor (M17)

IR Cooling Fan Motor (M52)

Fusing Unit Cooling Fan Motor (M23)

PH Cooling Fan Motor 2 (M19)

PH Cooling Fan Motor 1 (M22)

Ventilation Fan Motor (M18)

Upper Fusing Roller Heater Lamp (H1)

Lower Fusing Roller Heater Lamp (H2)

Fusing Roller Sub Heater Lamp (H3)

Developer bias (HV)

PC Drum Drive Motor (M21)

Main Erase Lamp (LA2)

Drum Charging Bias (HV)

Developing Unit Drive Motor (M1)

Exposure Lamp (FL51)

Scanner Motor (M51)

1st Drawer Paper Take-Up Motor (M4)

1st Drawer Paper Take-Up Sensor (PC3)

Upper Vertical Transport / Manual Feed Motor(M6)

Paper Leading Edge Sensor SW1 (PC5)

Power Switch ON Start Key ON

Half-speedrotation

Fusing Temperaturecontrol

Full-speedrotation


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5. IMAGE STABILIZATION SYSTEM

The following image stabilization controls are provided to ensure stabi

Item Purpose M

Initial Setup First correct for AIDC sensor disparity andcontamination. Then use ∆V control to setinitial values for grid voltage (Vg) anddeveloper bias (Vb).

Set initial values fodeveloper bias (Vb

Short-TermCorrection

Correct for ID drop caused by change indrum sensitivity.

Perform ∆V contro

Long-Term Cor-

rection

Correct for drop in surface potential (sur-

face fogging) caused by drum deteriora-tion.

Correct Vg based

drum rotation.

Morning Cor-rection (first runeach morning)

Correct for ID drop caused by low drumsensitivity when copier is first powerswitch is turned ON (before copier is fullywarmed up).

AIDC sensor contatrol to correct the gdeveloper bias (Vb

Correction AfterProlonged Non-

Use

Correct for ID change caused by changein drum sensitivity due to non-usage for at

least two hours in the standby state.

When START key trol to correct Vg a

the copy.T/C Correction Maintain the developing unit's T/C ratio at

a constant level.Use ATDC to cont

IN

CPU

OUT

LD

Toner Replenishing Mot(Main/Sub Hopper)

ATDC Sensor

Developer bias (Vb)

AIDC Sensor

PC Drum

Grid Voltage Vg

Rotation Counter

C S


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5-1. AIDC Sensor

The AIDC Sensor is used to detect the toner density and background l1. An LED projects infrared light onto the surface of the PC Drum.2. A phototransistor detects the intensity of infrared light reflected off

Drum.3. The phototransistor outputs a voltage corresponding to the intensi

reflected back.

Toner Density on PC Drum Light reflected Output Volta

High Small High

Low Large Low

PC Drum

AIDC Sensor Image Transfer/Paper Separator Coron

4002M506AA

GOutput

5 2 I St bili ti S t C t l


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5-2. Image Stabilization System Control

1. AIDC Sensor Coarse Adjustment• The following adjustment is made to prevent the AIDC Sensor outpu

ing from the specified range due to part-to-part variations in the AID

tion, circuit, deterioration, etc.).• The load resistance value is set with the 4-bit analog switch so that

put voltage becomes approximately 1volt in terms of the background

2. AIDC Sensor Fine Adjustment• The following adjustment is made to prevent the AIDC Sensor outp

varied by toner or other contamination of the sensor.

• The LED current value of the AIDC Sensor is varied so that the AIDage becomes 1 volt in terms of the background level to be erased.

3. ∆V Control• Drum deterioration and environmental factors may lead to a drop in

drum surface potential, resulting in ID loss.• To correct for this, grid voltage (Vg) and bias voltage (Vb) are adjust

sensor output voltage into the range between 4.40 V (lighter) to 4.4

4. Grid Voltage Control (Vg)• This control corrects for a loss in drum surface potential caused by

(loss of surface material). Correction is made by increasing the Vg b

hours of drum rotation.

CONTROLLED PART CONTROL SIGNAL WIRIN

AIDC Sensor PWB-A PJ7A-7B

CONTROL CONTROL VALUE INIT

Grid voltage −366 V to −924 V

6 PC DRUM SECTION


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6. PC DRUM SECTION

The PC Drum consists of layers of semiconductive materials placed obase, on which an electrostatic latent image is formed.

6-1. PC Drum Drive Mechanism• The PC Drum is rotated by drive from a motor.• The flywheel mounted on the drum shaft functions to smooth out po

due to backlash in gears.

PC Drum Charge Holding Laye

4002M508AA

Carrie

Aluminum Bas

PC Drum Drive Mo

Rear

PC

6 2 Grounding of the PC Drum


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6-2. Grounding of the PC Drum

The potential on the surface of the PC Drum exposed to the light is gro

Ground PlaDrum Holding Shaft

Ground Point

Drive Gear

Front

PC Drum

7 PC DRUM CHARGING SECTION


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7. PC DRUM CHARGING SECTION

• The PC Drum Charge Corona has a scorotron grid to deposit a charsurface of the PC Drum.

• The corona unit has a comb electrode that discharges only toward t

minimizing the amount of ozone produced.• The grid voltage applied to the grid mesh is varied to select betwee

Photo mode.

CONTROL SIGNAL ON OFF

PC Drum Charger PWB-A PJ12A-9B L H

Rear

Holder

Comb Electrode SpringGrid Mesh H

Cleaner

8 IMAGE READING SECTION


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8. IMAGE READING SECTION

Light is projected onto the surface of the original and the light reflectedconverted to a corresponding electrical signal.

1. Scanner2. Exposure Lamp (FL51)3. Inverter4. Scanner Motor (M51)

5. IR Cooling Fan Motor (M52)6. Scanner Reference Position Sensor

(PC51)

7. CCD Board (PWB8. Lens9. Original Size Dete10. Scanner Drive Ca

11. 2nd/3rd Mirror Ca

1 2 3 4

910

11

Front

Rear

8-1. Exposure Components Section


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8 1. Exposure Components Section

1. Auxiliary Reflector:Reflects light onto the areas that the Exposure Lamp cannot illumindoes not lie flat on the Original Glass (such as a book). It reduces otherwise be transferred to the copy.

2. Inverter:

Changes DC into AC to turn ON the Exposure Lamp.3. Mirror #1:Directs the reflected light from the original over to Mirror #2.

4. Exposure Lamp:A fluorescent lamp is used to illuminate the original.

4

3

4

8-2. Exposure Lamp Control


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8 2. Exposure Lamp Control

Control to turn ON and OFF the Exposure Lamp is provided by an Expsignal output from PWB-B

✽ Operation when Power Switch is switched ON1. The Scanner moves to, and stops at, the shading position.2. Automatic adjustment of clamp level: Sets the black level when sc3. The Exposure Lamp turns ON4. Automatic adjustment of gain: Sets the maximum white level.5. The Scanner returns to its home position.6. The Scanner moves to the shading position to make a shading co

7. The Scanner returns to its home position.8. A black line check is made (only the copier equipped with an EDH9. The Exposure Lamp turns OFF.

*1: Black line check1. Check that the EDH is lowered.2. The Scanner moves to, and stops at, the shading position.3. While returning to the home position, the Scanner checks the EDH

dust and scratches that could cause a black line.4. If any dust or scratches are found, the copier gives a warning mes

✽ Operation when the Start key is pressed (EDH scanning)


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1. The Exposure Lamp turns ON2. The Scanner starts moving to the shading position.3. A gain adjustment and a shading correction are made at the shad4. The Scanner moves to the original scanning position and starts re5. After having read the original, the Scanner moves to the home pos

Clamp level : Sets the black level when scanning an image.

Gain : Sets the maximum white level.


M51 PWB-IC PJ3IC-1~3 Pulse Output


FL51 PWB-B PJ5B-1 L H

GainClamp

Power Switch ON

Shading Read

Scanner MotorM51

Exposure LampFL51

Gain and

Start Key ON O

ScanStopReturn

ONOFF

8-3. Image Processing Process


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g g

The IR image processing system is composed of the following blocks.ment various types of corrective processing.

1. Photoelectric Conversion (CCD Sensor): PWB-IA

5. Image Monit

2. Analog Processing: PWB-B

3. ODD/EVEN Synthesis: PWB-B

4. Shading Correction: PWB-B

6. Magnification Processing: PWB-B

7. MTF Correction: PWB-B

8. IR Density Correction: PWB-B

9. Octal-to-Binary Converter: PWB-B

10. S/P Conversion: PWB-B

Memory: PWB-B

PH: PWB-B/JL/JR


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8-4. Image Density Control


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(1) Auto Exposure Control

• Auto Exposure Control varies the background removal threshold in original type (newspaper, photograph, etc.). This helps ensure that o

ponent in the low-density areas is removed, while retaining the imagacters and other high-density areas of the image.

• The IR Density Correction section uses the sampled image data to dthe original by the following method.

Scanning original fed through EDH : Realtime scanning

Multi Bypass Table : Scanning during prescan mot

Original

CCDSensor

Original placement

Lens

PWB-B

PWB-IA

ShadingCorrection

Image Monitor

IR Densitycorrction

PWB-BMemory

PWB-JL

PWB-JRPCDrum Copy

CPU

1. Scanning Original fed through EDH✽ Realtime Scanning


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✽ Realtime Scanning• Realtime scanning is a method in which the image data is sampled • The sampled image data is accumulated in the form of a reflectivity

gram is used to determine the type of the original and the backgrounis calculated as may be necessary.

✽ Reflectivity and Histogram• The reflectivity histogram prepared by the CPU of the Auto Exposur

chart for displaying the distribution of the image data readings.• The reflectivity distribution varies for different types of originals. This

peak value (*1) of this histogram to compute the best possible backg

threshold.

*1: The peak value represents the density of the original’s background.image (such as a word-processor document), where the background iwould appear all the way to the right, as shown by the dotted line in thFor a newspaper, which is characterized by a somewhat darker backg

would appear at about the position shown by the solid line in the abov

2. Scanning Original Placed on Glass✽ Scanning during prescan motion• This is a method in which image data is sampled while the Scanner

4

Black

Frequency Position of peak valueaccording to type of origiPeak Value

WhiteReflectivity Histogram

✽ Given below is the control flow when the Auto Exposure mode is se


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Start Key ON

The Scanner starts reading theoriginal.(The copy cycle is started.)

The image data read by the CCD sensor is transmitted (in paraShading Correction block to the Histogram block, where the datsampled, and the samples are counted in order to generated the

togram.

The CPU determines the type of the original based on the histogthe removal threshold accordingly.

The CPU transmits the threshold value to the IR Density Correctblock then corrects the image density of incoming data in accordrelation shown below.

Scanning original plDocument

X: Image density value after densa: 1χ: Image density value before de-b: Threshold (intercept)

X=aχ-b


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• Manual Exposure Control selects an exposure level variable in ninethe setting made on the control panel by the user when the copier issure mode.

• According to the manual exposure setting made on the control panetransmits a background removal threshold to the IR Density Correctcorrection. This background removal threshold has been predetermmanual exposure setting.

✽ The control flow during manual density mode is described below.

PWB-B

PWB-IA

MSC

AUTO

Control Pa

PHC

SectionPWB-JL

CPU

(IRC)

PWB-JRPH

SectionCopy

Laser Diode

Original

CCD

Sensor

Original placement

Lens

IR Density

corrction

The user selects the Manual Exposure mode on the Touch Paneexposure level manually.


45/114

8-5. Scanner and Mirrors Carriage Movement Me

(1) S M M h i


46/114

(1) Scanner Movement Mechanism

• The Scanner is driven by the Scanner Motor at a speed appropriatewith reference to the speed in the full size mode.

• The Scanner is detected at its home position by the Scanner Refere

(2) 2nd/3rd Mirrors Carriage Movement Mechanism

The 2nd/3rd Mirrors Carriage moves at a speed half that of the Scannconstant the optical path length between the original and the CCD Se

1. 2nd/3rd Mirror Carriage2. Scanner3. Scanner Motor (M51)

5. CCD Sensor6. Scanner Drive Ca

1 2 3

6

Rear

Front

5

8-6. Scanner Motor Drive Control

Th d t hi h th S i d i t ll d b i th


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• The speed at which the Scanner is moved is controlled by varying thdrive pulse that is timed with the reference clock.

• The distance over which the Scanner travels is controlled by the nupulses that correspond to each paper size and zoom ratio.

High Speed

Low Speed

Period


M51 PWB-IC PJ3IC-1~3 Pulse Output

9. MEMORY SECTION

Th M i h i d i d f h IR


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The Memory section stores the image density data output from the IR carry out data transmission to the Printer section.

9-1. Image Processing ProcessThe binary image data transmitted from the Image Processing Board undergoes the following processes before being transmitted to the PH

1. Input Image Memory• Stores binary image data.• Consists of SDRAM, and is capable of storing about one A4 page o

2. Compression Circuitry• Reads the binary data from the Image Memory block, one line at a t

presses it.

• Use of this compression step makes it possible for the next block (Eblock) to hold data.

3. Encoded Memory• Stores the encoded (compressed) data received from the previous

1. Image Memory

3. Encoded memory

Memory Se

5. Output Image memory

IR Section

PHC Section

2. Compre

4. Expans

10. Original Size Detecting Section

Th i i l i d t ti fi d i th ti l ti


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The original size detecting sensors fixed in the optical section are usesize of the original in the Auto Paper or Auto Size mode.

10-1. Original Size Detecting Operation

Each photo receiver of the original size detecting sensors responds to

1. Original Cover Detecting SensorPC52

2. Original Cover Detecting Sensor FD1PC53



5. Size Reset SwitchS51

6. Original Cover DePC57

7. Original Cover DePC56

1 2

6

Rear

Front

57

10-2. Original Size Detecting Sensors Locations

• The original size detecting sensors are located in the following posi


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The original size detecting sensors are located in the following posito detect different sizes of the original.

• Adding optional original size detecting sensors increases the numb

that can be detected by the system.

FD1 FD2 FD3 CD

Metric Areas Standard Standard Optional Stand

Inch Areas Optional Standard Optional Stand

11 X 8.5 8.5 X 11 8.5 X 14

A4L

B4L,B5C

A3L,A4C

A4C A4L B4LB5C

8.5 X 138.5 X 5.5

A5L

A5L

FD1

CD2

Rear

FrontCD1

FD2

1 2 34

5

6

78

✽ FD2, FD3 Sensor Locations

10-3. Original Size Detection

The Original Size Detecting Board determines the correct original size


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The Original Size Detecting Board determines the correct original sizenation of statuses of the original, either present or absent, as detecteddetecting sensors.

✽ Metric Area

● : Original Present -: Original Not Present ( ): Optional Sensor a

✽ Inch Area - Standard

Original Size

NeedOptionalSensors

FD1 FD2FD3

(Optional)

1 2 3 4 5 6

A3L No ● ● ● (●) (●) ●

B4L No ● ● ● (●) (●) ●A4L No ● ● ● (●) ( - ) -

A5L No ● - - ( - ) ( - ) -

A4C No ● - - ( - ) ( - ) ●

8.5 × 11 No ● ● - ( - ) ( - ) -

11 × 17 Yes ● ● ● (●) (●) ●

8.5 × 14 Yes ● ● ● (●) (●) -

8.5 × 13 Yes ● ● ● (●) ( - ) -

11 × 8.5 Yes ● - - ( - ) ( - ) ●

Original Size

NeedOptionalSensors

FD1(Optional)

FD2FD3

(Optional)

1 2 3 4 5 6

11 × 17 No (●) ● ● (●) (●) ●

8.5 × 14 No (●) ● ● (●) (●) -

8.5 × 11 No (●) ● - ( - ) ( - ) -11 × 8.5 No (●) - - ( - ) ( - ) ●

B4L No (●) ● ● (●) (●) ●

B5C No (●) - - ( - ) ( - ) ●

10-4. Original Size Detection Timing


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✽ :Numbers 1 through 4 are enabled when the EDH is mounted; only enabled when the Original Cover is mounted.

1Takes sizereadings

When the Original Cover is raised to an angle of 1Cover Detecting Sensor is deactivated).

2Affirms sizereadings

When the Original Cover is lowered to an angle ofCover Detecting Sensor is just activated) and the actuated. Or, when the Start key is pressed with tDetecting Sensor in the deactivated state.

3Resets sizereadings

When the Original Cover is raised and the Size Rdeactuated from actuated state.

4Unable to takesize readings

A notice is given to the user if the Start key is presCover not raised to an angle of 15° or more in a s

CONTROL SIGNAL Blocked Unblocked

PC52 PWB-B PJ5B-2 L H


S51 PWB-B PJ306B-7 H L

4002M524AA

Size R

S51

Original Cover Detecting SensorPC52

11. PH SECTION

Image data sent from the memory section is corrected and, based on


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Image data sent from the memory section is corrected and, based on laser light is projected onto the surface of the PC Drum to form a correimage.

1. Lenses2. Return Mirror3. Cylindrical Lens4. Beam Interval Correction Motor (M20)5. LD Drive Board R (PWB-JR)

6. LD Drive Board L 7. Polygon Mirror8. Polygon Motor (M9. SOS Sensor Boar10. SOS Mirror

1 2 3 4

8

9

10

Front

11-1. Image Processing Process

The PH image processing system is composed of the following blocks


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ment a variety of types of corrective processing, as described below.

1. Erasure of Outside Area : PWB-B

7. D/A Conversion : PWB-B

2. Bit Expansion : PWB-B

Memory: PWB-B

3. Image Density Smoothing : PWB-B

4. γ Correction : PWB-B

5. Line Memory : PWB-B

8. LIMOS Circuitry : PWB-JL, JR

9. Laser Emission : PWB-JL, JR

6. Two-Beam P : PWB-B

1. Erasure of Outside Area: PWB-BErases the area outside of the image area, so as to prevent firing


55/114

non-image areas.

2. Bit Expansion: PWB-B

If image quality is set to photo mode, this block expands binary dadata values. (If image quality is set to the Text mode, the block oudensity data values without change.)

3. Image Density Smoothing: PWB-BThe edge data is filtered in the Text mode and data is converted, tgies that would otherwise occur along the edges.

4. γ Correction: PWB-BAdjusts data so that the copied image's gradation characteristics to the gradation characteristics of the original. Adjustment is madappropriate gamma look-up table, then using the table data to covalues into appropriate laser intensity values.

5. Line Memory: PWB-BCorrects for differences in data transfer frequency with respect to

6. Two-Beam Position Correction: PWB-BThe amount of positional deviations in the main and sub scanningtwo laser beams is detected to make the necessary corrections.

• Main scanning direction: Correction is made by advancing or retardemission start timing signal.

• Sub scanning direction: Correction is made by turning the steppin

7. D/A Conversion: PWB-BConverts the 8-bit laser intensity data values into analog laser int

8. LIMOS Circuitry: PWB-JL, JRActivates the APC (Auto Power Control) function that controls thethrough the LD for each line; activates the ACC (Auto Current Costabilizes the drive current for each dot.

9. Laser Emission: PWB-JL, JR• Fires laser onto PC drum in accordance with the emission level givblock.

• The copier employs 2 laser beams, and therefore prints two lines a

11-2. Laser Emission Timing (SOS Signal)

The laser diode is forced to turn ON to project the laser beam onto thehi h t SOS i l


56/114

which generates an SOS signal.

1. Lens2. Cylindrical Lens3. LD Drive Board R (PWB-JR)4. LD Drive Board L (PWB-JL)

5. Beam Interval Co6. Polygon Mirror7. SOS Sensor8. SOS Mirror

1 2

5

6

7

8

Front

✽ Relation between laser emission timing and SOS signalThe light path of the laser beam changes as the Polygon Mirror turns.chronizes the rotation of the Polygon Mirror with the laser emission tim


57/114

A. LD force-ON

The laser diode is forced ON to output

B. SOS signal outputA laser beam strikes the SOS Sensor determines the SOS signal output timiAfter the timing has been determined, turned OFF.

SOS Sensor Board

A

SOS signal output t

C. Start of image data outputThe laser emission start timing is contthe size of the image to be output.

D. End of image data outputThe laser radiation area is controlled aof the image to be output.After the image area has been coveredt d OFF

4002M589AA

4002M590AA

4002M591AA

4002M592AA

Sensor A output

CB

12. DEVELOPING UNIT SECTION

The Developing Unit agitates and triboelectrically charges toner so that t ti l t t i f d th f f th PC D th h


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trostatic latent image formed on the surface of the PC Drum, then chavisible, developed one.

1. Toner Bottle2. Toner Bottle Holder

3. Toner Bottle Home Position SensorPC21

4. Main Hopper Toner ReplenishingMotor M13

5 Sub Hopper Toner Empty Detecting

8. ATDC Sensor UN9. Developer Convey

10. Bucket Roller11. Magnet Sheet12. Sleeve/Magnet Ro13. Doctor Blade14 Developer Scatter

14

1

1011

12

13

89

15

12-1. Developing Unit Drive Mechanism

The rollers and screws are driven through a gear train from the motor.


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1. Coupling Gear2. Sub Hopper Toner Agitating Lever3. Developer Conveying/Agitating Screw4. Bucket Roller

5. Sleeve/Magnet Ro6. Toner Conveying 7. Developing Unit D


M1 PWB-A PJ7A-6A L H

1

2

7

Fr

Rear

12-2. Sleeve/Magnet Roller

• The Sleeve/Magnet Roller, which consists of an outer sleeve roller aroller conveys developer to the point of development


60/114

roller, conveys developer to the point of development.• The magnetic force of the magnet roller at the point of development

that the developer brush stands straight up to deliver the greatest ampoint of development.

12-3. Doctor Blade

The Doctor Blade controls the height of the developer brush, ensuring the Sleeve/Magnet Roller levels out.

1177M060AA

PC Drum Sleeve Roller Develope

Magnet Roller

Magnetic flux

1156M017AA

Doctor Blade

Sl /M t R ll

12-4. Developing Bias

• A developing bias voltage (Vb) is applied to the sleeve roller to prevground on the copy.


61/114

g ou d o e copy• The amount of toner attracted onto the surface of the PC Drum dep

lower the PC Drum surface potential (Vi) is than Vb (i.e., potential d✽ When the potential difference is large, a greater amount of toner is ✽ When the potential difference is small, a smaller amount of toner is


Developing Bias PWB-A PJ12A-8B L H

Sleeve/Magnet Roller

Developing Bias Terminal

Front

12-5. ATDC Sensor

The ATDC Sensor detects the toner-to-carrier ratio (T/C) of the develoMixing Chamber.


62/114

g

(1) ATDC Sensor Automatic Adjustment

The reference value for the ATDC Sensor is automatically adjusted as the ATDC Sensor Automatic Adjustment mode.

CONTROL SIGNALREFERENCE

T/C RATOSTANDARD

OUTPUT VOLTA

UN2 PWB-A PJ7A-10B 5.0 % 2.27 V

Developer Conveying

ATDC Sensor UN2

With the copier set in the ATDC Sensor Automatic Adjustment mode, press th

The developer is mixed.

The ATDC Sensor converts the reference T/C (5.0 %)to a corresponding voltage value and outputs it.

Is the output voltage 2.27 V?

YES NO

The voltage input to the ATDC Sensor from theMaster Board at this time is fixed as the reference

The voltage input to the Athe Master Board is varie

12-6. Toner Replenishing Control

Toner Replenishing Control by ATDC SensorThe ATDC Sensor samples T/C for each scan motion and the copier c


63/114

with the reference T/C to determine the appropriate amount of toner to

✽ The amount of toner replenished varies according to the paper sizeare figures for A4).

12-7. Toner Supply Hole Covering/Uncovering MecThe Toner Supply Hole is covered to prevent toner from dropping into copier when the PC Unit is slid out of the copier.

Toner Replenishing Conditions A

Large amountThe sensor reading is lower than the refer-ence T/C ratio [4.5 %] by 0.5 % or more.

Small amountThe sensor reading is lower than the refer-ence T/C ratio [4.5 %] by less than 0.5 %

Fixed amountThe sensor reading is higher than the refer-ence T/C ratio [4.5 %] by less than 0.5 %

NoneThe sensor reading is higher than the refer-ence T/C ratio [4.5 %] by 0.5 % or more.

PC UnCover Plate

Main Hopper holder

Covering the TSprings

Uncovering the

12-8. Toner Bottle Home Position Detection Mecha

The Toner Bottle is detected at its home position by a home position dWhen the Toner Bottle is at the home position (stationary), its toner su


64/114

up.

12-9. Toner Bottle Vibration MechanismWhen the dents in the Toner Bottle move past the collars in the Bottle Htle is vibrated to prevent some of the toner from remaining unconsume


PC21 PWB-A PJ11A-5 H L

4002M533AA

Toner Bottle Home PosPC21

Toner Supply Port

Home Position Detecti

Coupling

Dent in the Toner Bottle

Bottle Ho


65/114

12-12. Sub Hopper Toner Replenishing Mechanism

• The Sub Hopper Toner Replenishing Motor replenishes toner from tDeveloper Mixing Chamber.Th t l i hi ti i l l t d b d th T/C di


66/114

• The toner replenishing time is calculated based on the T/C reading


M14 PWB-A PJ7A-2B L H

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ;

Sub

Sub Hopper Toner ReM14Sub Hopper Toner Replenishing Roller

Sub Hopper Tone

Sub Hopper To

12-13. Sub Hopper Toner Empty Detecting Mechan

• A magnet and a toner-empty detecting switch detect a toner-empty Hopper.

• As toner in the Sub Hopper is consumed the magnet turns ON the


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• As toner in the Sub Hopper is consumed, the magnet turns ON the Empty Switch. This causes the copier to start a toner replenishing sHopper Toner Empty Switch remains ON for 2 sec. or more even whhas been turned for 60 sec., the copier determines that it is a toner-n

• A toner-empty condition is detected when T/C becomes less than 3empty condition.

Detecting Conditions

Toner Near Empty Detected The Sub Hopper Toner Empty Switch remond after a toner replenishing sequence

Toner Empty Detected T/C becomes less than 3% in a toner-ne

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

; ; ; ;

4002M

Ec

SubEm

Sub Hopper Toner Empty Switch

S4

Magnet

Toner Empty To

13. PAPER TAKE UP/FEED SECTION

1 2 3 4 5


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1. Synchronizing Roller2. Synchronizing Roller Sensor

PC13. Transport Rollers4. Transport Roller Sensor

PC25. Manual Bypass Feed Roller6. Manual Bypass Separator Roller7. Manual Bypass Take-Up Roller8 Paper Leading Edge Sensor SW1

13. 2nd Drawer PapePC4

14. 2nd Drawer Feed 15. 2nd Drawer Sepa16. 2nd Drawer Paper

17. 2nd Drawer PapePC17 (at front of c2nd Drawer Lift-UPC15 (in rear of c

18 1st Drawer Separ

16

21

19

18

20

17

13-1. Drawer In Position Detection

When the drawer is slid into the copier, the light blocking plate blocks copier then knows that the drawer has been slid in position.


69/114

CONTROL SIGNAL Blocked UnblockedPC10 (1st Drawer) PWB-A PJ3A-9A H L

PC11 (2nd Drawer) PWB-A PJ3A-9B H L

Drawer is slid in

1st DrawePC10

2nd DrawePC11

Drawer is slid out

13-2. Paper Empty Detection Mechanism

The Paper Empty Sensor detects a paper-empty condition in the draw


70/114


PC16 (1st Drawer) PWB-A PJ4A-9B H L


Paper Present

PC16, 17 Blocked

Paper not Prese

PC16, 17 Unbloc

Paper Empty Senso1st Drawer: PC162nd Drawer: PC17

4002M544AA

Paper Empty

Paper Lifting Plate

13-3. Drawer Paper Lifting/Lowering Mechanism

The paper lifting mechanism employs the Lift-Up Motor that causes thin the drawer to be pressed up against the Paper Take-Up Roller with thereby ensuring positive paper take-up.


71/114

y g p p p p

Paper Take-Up Roller/Feed

Paper Lifting Arm

Pressure Release Lever

Dra

Rear

Lift-Up Sensor1st Drawer: PC142nd Drawer: PC15

12

The Lift-Up Motor is ener

When the drawer is slid in

The Paper Lifting Arm go

The Lift Up Sensor is blo

Paper is consumed

During a copy cycle


72/114


PC14 (1st Drawer) PWB-A PJ4A-6B H L



M11 (1st Drawer) PWB-A PJ3A-13A H L

M12 (2nd Drawer) PWB-A PJ3A-13B H L

The Paper Take-Up Roller

The Lift-Up Sensor is unb

The Lift-Up Motor is ener

The Paper Lifting Arm go

The Lift-Up Sensor is blo

The Lift-Up Motor is deene4002M547AA

13-4. Paper Level Detection Mechanism

The amount of paper still available for use, or the paper level, of the dthe Lift-Up Motor Pulse Sensor and a pulse disk. They function to deteLift-Up Motor.


73/114

The Lift-Up Motor is energizeWhen the drawer is slid in

The number of pulses generated is coperiod of time until the Lift-Up Sensor

The number of pulses is translated to t

paper which is indicated on the con

Paper is consumed.During a copy cycle

The number of pulses generated is coperiod of time until the Lift-Up Sensor

The number of pulses is cumulatively cototal count is translated to the amoun

The Lift-Up Motor is energize

The unit segment of the paper level indcontrol panel goes out.

• 1 to 50 sheets

• 50 to 200 she

✽ Paper leve

Pulse Disk

Lift-Up Motor1st Drawer: M112nd Drawer: M12

13-5. Universal Tray Paper Size Detection Mechan

• Both the width (in the crosswise direction) and length (in the feedingpaper are detected and the copier CPU determines the paper size bnation of the two readings.


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✽ Details of paper Size Detecting Switches/Sensors Operation and De 1st/2nd Drawer L/H: Either L or H

Paper SizeName

InchEquivalent

Width × Length(mm)

Paper Size Detectin

FD (PWB-I1, I2)

FD1 FD2 FD3 FD4

A5L *1 148 × 210 L/H H H H

B5L 182 × 257 H H L H

B5C 257 × 182 L L H H

A4L 210 × 297 H L/H L L

Trailing Edge Guide Plate

Paper Size Detection Board1st Drawer: PWB-I12nd Drawer: PWB-I2

Paper SizeName

InchEquivalent

Width × Length(mm)

Paper Size Detectin

FD (PWB-I1, I2)

FD1 FD2 FD3 FD4

G LETTER C 10.5 × 8 267 × 203 L H H H


75/114

Switch Operation L: OFF, H: ONSensor Operation L: Blocked, H: Unblocked*1: Metric areas*2: Inch areas

*3: “Tech. Rep. Mode > System Input > Paper size Input” must be set

• 1st Drawer

• 2nd Drawer

QUART L 10 × 8 254 × 203 H H L HKorea FLS *1 192 × 268 H L H H

EXE L *2 7.25 × 10.5 184 × 267 H L H H

EXE C 10.5 × 7.25 267 × 184 L L H H

FLS *3 8 × 13 203 × 330 L L L L

FOLIO *3 210 × 330 L L L L

FOLIO *3 210 × 356 L L L L

G LEAGAL L*3 8.5 × 13 216 × 330 L L L L


PWB-I1 FD1 PWB-A PJ4A-1A H L





PC23 PWB-A PJ12A-3A H L

PC25 PWB-A PJ12A-9A H L


13-6. Paper Take Up Mechanism

Drive for the paper take-up sequence comes from a motor.

1st Drawer Pa


76/114

(1) Paper Separating MechanismThe difference in friction coefficient between the Feed Roller and Septo stop the rotation of the Separator Roller for the prevention of double

Normal feeding: When only one sheet of paper is taken up, the frictiotop side of the paper is equal to that on the undersideRoller is driven by the Feed Roller, which results in th

Double feeding: Since the friction coefficient between the second sheSeparator Roller is greater than that between the firsof paper, the Separator Roller remains stationary, alloto feed only the first sheet of paper.

M4

Paper Take-Up Roller

Feed Roller

Separator Roller

Torque Limiter

Front

2nd Drawer P

M5

(2) Paper Pressure Release Mechanism

When the drawer is pulled out of the copier, the Pressure Release RaSeparator Roller Assembly, which results in the Separator Roller beingthe Feed Roller.


77/114

(3) Paper Take Up Roller Retracting Mechanism

When the drawer is pulled out of the copier, the Pressure Release LevPaper Take-Up Roller/Feed Roller Assy, causing the Paper Take-Up Rthe paper stack.

Approx.2 mm

Feed Roller

Separator Roller Assembly

Pressure Spring

Drawer

Paper Take-Up Roller/Feed Roller Assembly

Pressure Release Lever

Paper

13-7. Paper Take Up Control

(1) Paper Take Up Motor Control

The Paper Take-Up Motor is controlled by the signal output from the M


78/114


M4 (1st Drawer) PWB-A PJ5A-1A~3A Pulse OutputM5 (2nd Drawer) PWB-A PJ5A-4A~6A Pulse Output


1st Drawer Paper Take-Up MotorM4

Upper Vertical Transport / ManualFeed Motor M6

1st Drawer Paper Take-Up SensorPC3

Paper Leading Edge Sensor SW1PC5

Transport Roller Sensor

PC2Transport Roller MotorM8

Synchronizing Roller SensorPC1

Synchronizing Roller MotorM9

ON

OFF

ON

OFF

ON

OFF

ON

OFF

H

L

H

L

H

L

H

L

1st sheet of paper Tak-Up start2nd sheet of paper Tak-Up

VD SignalON

OFF

*Multi Copy cycle

(3) Paper Take Up Interval Control

To minimize the occurrence of a paper misfeed due to improper paperpaper take-up sequence is temporarily halted if the paper fails to reachDetecting Sensor within a given period of time after the sequence hasanother given period of time, the paper take-up sequence is performe


79/114

g p p p p q p

thereby ensuring a good interval between two paper take-up sequenc

(4) Double Feed Paper Take Up Control

If double feed has not occurred, the copier starts the paper take-up sesequent sheet of paper as soon as the Paper Take-Up Sensor is deacIf double feed occurs, the Paper Take-Up Sensor is not deactivated. Instarts the paper take-up sequence for the subsequent sheet of paper

Leading Edge Sensor is deactivated.

400

Transport Roller Sensor

1st Drawer Paper Take-Up SensorPaper Leading Edge Sensor SW1

(Double Feed Paper Lea

Double

Not Provided

Provided

Not Provide

Provided

Paper Leading Edge Sensor SW2

2nd Drawer Paper Take-Up Sensor

Paper Path

13-8. Vertical Transport Drive Mechanism

A motor drives the Vertical Transport Rollers.

Upper Vertical Transport/Manual Feed Motor


80/114

4002M551AA


Lower VRoller

Upper Vertical Transport Roller

Front Lower VertiM7Paper Leading Edge Sensor SW2

PC6

M6

ON

OFF

H

L

ON

OFF

ON

OFF

HL

H

1st sheet of paper Tak-Up start

2nd sheet of paper Tak-Up sta

2nd Drawer Paper Take-Up MotorM5

2nd Drawer Paper Take-Up SensorPC4

Lower Vertical Transport MotorM7



Paper Leading Edge Sensor SW2

✽ For details of the 1st Drawer control, see 13-7. “Paper Take Up Co

14. MANUAL FEED TABLE SECTION

1 2 3 4


81/114

1. Manual Feed Paper Empty SensorPC18

2. Manual Bypass Feed Roller3. Manual Bypass Separator Roller4. Manual Feed Paper Pick-Up Solenoid

SL5

5. Upper Vertical TraMotor M6

6. Paper Stopper7. Manual Bypass Ta

676

Front

14-1. Manual Take Up Roller Pressure Mechanism

The Multi/Manual Bypass Take-Up Roller is raised and lowered by enegizing the solenoid.

Solenoid Take-Up Roller Position


82/114

14-2. Manual Feed Paper Separating Mechanism

The difference in friction coefficient between the Feed Roller and Septo stop the rotation of the Separator Roller for the prevention of double

✽ For details of the Paper Separating Mechanism, see 13-6. (1) “Papenism”.

p

At take-up Deenergized Down

At timings otherthan take-up

Energized Up

4002M553AA

Take-Up Roller

Paper Stoppers (locked)

Lock Lever Manual Feed PaperSL5

✽ At Take-Up

Segment Gea

Lever

Pressed

Retracted

Energized

✽ At Timing OtherThan Take-Up

Deenergized

14-3. Manual Feed Paper Empty Detection Mechan

The Multi/Manual Bypass Paper Empty Sensor detects a sheet of papual Bypass Table.

Manual Feed Paper Empty Sensor


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14-4. Manual Feed Take Up Control


PC18 PWB-A PJ2A-3 L H

1154M065AA

p p yPC18

When Paper is Placed When No Paper

Start KeyON

OFF

Pressed

RetractedSL1 Pressed

SL1 DOWN SL1

SL1 UP SL1

(SL1: Manual Feed Paper Pick-Up Solenoid)

H

L

H

L

ON

OFF

Manual Feed Paper Empty SensorPC18

H

L

1st sheet of paper Tak-Up start

2nd sheet of paper Tak


15. TRANSPORT/SYNCHRONIZING ROLLE

The Synchronizing Rollers are turned in time with the optical section (port section (paper).


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15-1. Paper Dust Remover

Triboelectric charges generated on the roller attracts paper dust from dust is then transferred onto the Paper Dust Remover.

1. Upper Synchronizing Roller2. Paper Dust Remover3. Upper Transport Roller4. Transport Roller Sensor

PC2

5. Lower Transport R6. Paper Leading Ed

PC17. Lower Synchroniz

1 2 3

56

7

Paper Dust RemoverPaper

Dust

15-2. Transport Roller Drive Mechanism

The Transport Roller is driven by a motor.

Upper TransportRear


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15-3. Synchronizing Roller Drive MechanismThe Synchronizing Roller is driven by a motor.


M8 PWB-A PJ5A-4B~6B Pulse Output


M9 PWB-A PJ5A-7B~9B Pulse Output

Transport Roller MotorM8

Lower Transport Roller

Synchronizing Roller MotorM9

Upper Synchron

Lower Synchronizing Roller Fro

Rear

16. IMAGE TRANSFER AND PAPER SEPAR

TION

• The DC corona emission applied by the Image Transfer Corona attrformed on the surface of the PC Drum onto the surface of the paper


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developed image of the original.• The AC corona emission applied by the Paper Separator Corona w

attraction between the paper and PC Drum.• The PC Drum Paper Separator Fingers physically peel paper off the

Drum.

1. PC Drum2. Image Transfer Corona Wire Cleaner

3. Image Transfer Corona Wire4. Pre-Image Transfer Guide Plate5. Image Transfer/Paper Separator Coro-

nas Unit Rail

7. Image Transfer CoLever

8. Resistor9. Paper Separator C10. Guide

1 2 23

4

5

6

76

8

9

10

16-1. PC Drum Paper Separator Fingers Section

(1) Finger Pressing Detection Mechanism

• The PC Drum Paper Separator Fingers are pressed against the surto properly separate paper from the surface of the PC Drum.

• This motion is done by the Separator Finger Solenoid.


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(2) Finger Back and Forth Detection Mechanism

The PC Drum Paper Separator Fingers are moved in the crosswise didamage to the PC Drum.


SL4 PWB-A PJ7A-4B L H

4002M5

Separator SolenoidSL4

Swash Plate Cam

Finger Operating

PC Drum Paper Sepa

PC Drum Pap

Pawl A

Return Spring

Swash Plate Cam

PC Drum Paper Separat

Ratchet Wheel

Pawl A

17. PC DRUM CLEANING SECTION

• The Cleaning Blade scrapes off any toner remaining on the surface• The PC Drum Paper Separator Fingers physically separate paper fr

PC Drum.

C


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17-1. Cleaning Blade Moving Mechanism

• The Cleaning Blade is moved back and forth while the PC Drum is tall residual toner is scraped cleanly off the surface of the PC Drum, the PC Drum as well as Cleaning Blade from deteriorating.

• Drive from a motor turns the Lateral Movement Cam, which results i

being moved back and forth.

4002M5

Cleaning Blade

Toner Conveying Coil

PC Drum Paper Separator Fingers

Blade Tension Spring

PC Drum

Cleaning Blade Assembly mouEccentric Cam

Rear

17-2. Toner Conveying/Collecting Mechanism

• The toner, which has been scraped off the surface of the PC Drum Blade, is conveyed by the Toner Conveying Coil and dropped into thBottle.

• The Toner Conveying Coil is driven by a motor.


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Cleaning Blade

Toner Conveying Coil

Toner Antispill Mylar

PC Drum

Residual

Toner ConGear (Cop

Toner ConGear (PC

C

Toner Collecting Box

Toner Collecting Box Set Sensor

Pipe

Spent Toner Flow

18. MAIN ERASE SECTION

The light from the Main Erase Lamp neutralizes any surface potential face of the PC Drum after cleaning.

Main Erase Lamp Board


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LA2 PWB-A PJ9A-7A L H

40

Main Erase Lamp LA2

Filter

PC Drum

19. TRANSPORT SECTION

• Rotation of the Suction Fan Motor results in the paper separated fromdrawn onto the turning Suction Belts.

• The Suction Belts are driven by a motor.

Speed Pl d I * W it C JAM T bl F


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* Plugged in: Where Sleep or Auto Shut OFF is activated

SpeedControl

Plugged In* Wait Copy JAM Trouble F

M17 stop Half Full stop stop

Fusing Motor M2

Suc

Suction Belts

Suction Fan Motor M17

Ozone Filter

Suction Belts

Suction Roller Drive Mechanism

Air

Air

Rear

20. FUSING SECTION

The Fusing Unit fixes permanently the developed image to the paper pressure to the toner and paper.

1 2 3 45


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1. Web Take-Up Roller2. Oil Supply/Web Feeding Roller

3. Web Roller4. Misfeed Clearing Knob Shaft5. Upper Fusing Roller6. Upper Fusing Roller Thermostat (TS1)7. Upper Fusing Roller Thermistor (TH1)8. Fusing Roller Sub Thermistor (TH3)9. Fusing Roller Sub Heater Lamp (H5)

10. Upper Fusing Roller Heater Lamp (H1)11. Lower Fusing Roller Thermistor (TH2)

12. Lower Fusing Rolle13. Lower Fusing Rolle

14. Fusing Roller Press15. Lower Paper Separ16. Upper Paper Separ

5

6

7

9

12 111314

15

16

10

8

20-1. Fusing Unit Drive Mechanism

A motor is provided for driving the Fusing Unit.

2


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CONTROLLED PART CONTROL SIGNAL ON OFF

M2 PWB-A PJ7A-1A L H

1. Clutch Spring2. Misfeed Clearing Knob Shaft3. Upper Fusing Roller4. Lower Fusing Roller

5. Upper Fusing Roll6. Fusing Motor (M2)

1

5

6Connect

Rear

20-2. Fusing Rollers Pressure Mechanism

To ensure that there is a certain width of area of contact (nip) betweenLower Fusing Rollers, pressure springs are installed to press the Loweagainst the Upper Fusing Roller.

1


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1. Upper Fusing Roller2. Pressure Holder3. Pressure Spring4. Pressure Screw

5. Lower Fusing Roller

2345

2

3

4

Front

Rear

20-3. Fusing Roller Cleaning Mechanism

Cleaning Web Take-Up Mechanism• The Cleaning Web is taken up by the Web Take-Up Roller which is d

Web Drive Motor (M24).• The Cleaning Web Drive Motor turns one turn in every 7 to 14 copies

Cleaning Web.✽ Th l th f th Cl i W b t k l ti f th


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g✽ The length of the Cleaning Web taken up per one revolution of the m

ing on the amount of Cleaning Web that has already been taken up.the beginnings of a new roller of Cleaning Web, a shorter length of one revolution of the motor, as there is very little amount of web takTake-Up Roller. The more the web is taken up, the longer the lengtThe copier therefore refers to the count of the ÅgWeb RollerÅh cou

motor one turn, in the beginning, for every 7 copies made and, at the14 copies made. It thereby ensures that a given amount of web is tcopy.

• The Web Take-Up Roller shaft is provided with a clutch spring that pfrom turning backward. This prevents the Cleaning Web from devekling during take-up. This arrangement gives a given tension to the

• There is a gage provided showing an approximate amount of Cleani

for use.

1 2

Amount still availablefor use - Small

Amount still availablefor use - Large

6

7

Checking the Amount of Cleaning Web Still Available for Use:

Front

20-4. Fusing Temperature Control

• The Fusing Roller Heater Lamp is turned ON and OFF to keep a sesurface of the Fusing Roller.

• The surface temperature of the Fusing Roller is detected by using alates a detected temperature to a corresponding electrical signal.

• If the Fusing Roller temperature becomes excessively high, the FusLamp is shut down


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g p y g ,Lamp is shut down.

• The Lower Fusing Roller Heater Lamp is not turned ON during a coup cycle. During a warm-up cycle, both the Upper Fusing Roller HeFusing Roller Sub Heater Lamp are turned ON at the same time.

• The temperature for fusing temperature control can be selected fromoptions (180, 190, and 200 °C) by using a Tech. Rep. Choice functio

✽ 1: 120-127V areas✽ 2: 220-240V areas

Part Name Symbol Function

Upper Fusing RollerHeater Lamp

H1ON during a warm-up cycle, standby stacopy cycle, and when the Energy Savercanceled.

Lower Fusing RollerHeater Lamp H2 ON during a standby state

Fusing Roller Sub HeaterLamp

H5ON during a warm-up cycle and the Enemode, and when the Energy Saver modceled.

Upper Fusing Roller Ther-mostat

TS1Detects the surface temperature of the Uing Roller that has become inordinately

Upper Fusing Roller Ther-mistor

TH1 Detects the surface temperature of the Uing Roller.

Lower Fusing Roller Ther-mistor

TH2Detects the surface temperature of the Ling Roller.

Fusing Roller Sub Ther-mistor

TH3Detects the surface temperature of the Uing Roller only in the Energy Saver mod

(°C) Standby

Copy Cycle

Standby Energy Saver

Warm-up

St

Power Switch ON Start Key ON Cance


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✽ 1: 120-to-127-V areas✽ 2: 220-to-240-V areas

CONTROLLED PART CONTROL SIGNAL ON OFF

H1 PWB-A PJ7A-8A L H

H2 PWB-A PJ7A-11A L H

H5 PWB-A PJ7A-11A L HTH1 PWB-A PJ7A-9A Analog Input

TH2 PWB-A PJ7A-12A Analog Input

TH3 PWB-A PJ20A-1 Analog Input

190*1

120

990 (se

90

185*2

20-5. Control of Fusing Roller Small-Amount Turn

• If the Fusing Rollers remain stationary for more than 60 minutes witcontrol kept active, heat and pressure deform the nips of the two rosituation, the motor is automatically energized once in a given periorollers 1/4 turns.

• The motor is energized once when the cumulative period of time cothe motor remains deenergized reaches a predetermined value


98/114

the motor remains deenergized, reaches a predetermined value.

Cumulative Period of Time Counted

Motor Driven 55 minutes

A C B

Warm-upTemperaturecontrol ON

Temperaturecontrol OFF

Fusing Roller

ON

OFFFusing Motor

140 ms 140 ms

55 min.

A + B = 55 minutesC: The period of time over which the Front Door Interlock SwiOFF and ON, a malfunction condition continues, Energy Saveor the Predrive OFF Rear Sensor is deactivated and activated

20-6. CPM Control

The CPM (copies/minute) control is provided to keep good fusing perfmulti-copy cycles and with the system power sourced from a single po1. Overview• The Fusing Roller surface temperature goes down in a multi-copy c

degraded fusing performance.↓


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↓• CPM is decreased.

↓• A greater interval results between sheets of paper, which gives time

surface temperature to increase and recovers good fusing performa↓

• The normal CPM is set again.

2. Details• During the CPM control, the copier provides a greater interval betwe

between sheets of paper, with the system speed remaining unchan• The CPM control is usually activated if a multi-copy cycle is run imm

power has been turned ON in the morning when the Fusing Rollers • In times other than early morning, the Fusing Roller is heated from

with a multi-copy cycle run, the CPM control is not readily activated• It can, however, be activated even at times other than early morning

(g/m2) paper or large-size paper is used.

✽ A multi-copy cycle run immediately after warm-up in early morning:

Normal Paper Size CPM

47 or 55 copies/minute A4C or Letter C 40 copi

(°C) Start Key ON CPM Control(40 copies/min) Normal CPM Cop

Changes in Upper FuTemperatureChanges in Lower FuTemperature

21. EXIT/DUPLEX SWITCHING SECTION

The Exit/Duplex Switching Unit switches the paper path to feed the coTray or into the Turnover Unit.

1 2 3 4


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1. Exit Roller2. Paper Exit Sensor

PC93. Exit Switching Lever4. Transport Roller5. Upper Fusing Roller6. Lower Fusing Roller7. Transport Roller

8. Exit/Duplex SwitcSL3

9. Turnover Feed EnPC7

10. Triple Roller11. Exit Roller

78910

11

21-1. Exit/Duplex Switching Mechanism

The paper path to the Exit Tray or to the Turnover Unit is selected by oTurnover Switching Solenoid.

Paper Exit Sensor PC9


101/114

Exit Roller

Exit/Duplex Switc

SL3SL3 OFF

Sheet is ejected to Exit Tray Sheet is ejected to

Rear

22. TURNOVER SECTION

The turnover unit reverses the copy fed from the Exit/Turnover Switchiinto the Duplex Unit.

Exit/Duplex Switching Section15


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1. Exit Switching Lever2. Exit/Duplex Switching Solenoid

SL33. Turnover Feed Jam Sensor

PC84 Turnover Roller Retraction Solenoid

8. Turnover Roller9. Turnover Roller Sw

10. Turnover Route SwSL6

11. Turnover Roller12 Flapper

4002M

1

2

3

4

5

6

78

9

10

11

10

12

13

14

22-1. Turnover Drive Mechanism

The Turnover Unit is driven by a motor.

31 2 Arrow


103/114

1. Turnover MotorM10

2. Turnover Feed Jam SensorPC8

3. Turnover Transport Roller 14. Timing Belt

5. Turnover Roller6. Turnover Transpo7. Turnover Roll8. Turnover/Exit Sen

PC27

7

8

4

Rear

22-2. Turnover Control

• The paper transport direction is selected by turning the motor forwa• A sensor on the paper path is used to determine the timing at which

motor rotation is switched from backward to forward, or vice versa.

Synchronizing Roller Motor ONSynchronizing Roller sensor O

✽

Not Roller Separation


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Paper Exit SensorPC9

Brake

Reverse

Forward

L

H

First Sheet

L

H

Exit/Duplex Switching SolenoidSL3 OFF

ONTurnover

First Sheet Second Sheet

Not turnover

OFFON

Energized (ON) if the FD leng

Evaluate the FD length

Second Sh

STurnover Feed Entry SensorPC7

Turnover MotorM10

Turnover Roller SwitchingSolenoid SL6

Turnover

Synchronizing Roller Motor ON

Synchronizing Roller sensor O


Turnover

First Sheet Sec


Paper Exit SensorPC9

BrakeReverse

Forward

LH

LH

Exit/Duplex Switching SolenoidSL3 OFFON

Turnover Feed Entry SensorPC7

Turnover MotorM10

✽ Roller Separation


105/114

22-4. Turnover/Exit Mechanism

(1) Selection of Turnover or Exit Path

A flapper is used to select the paper exit path when the paper is to beout of the copier.

At Entry to Turnover For Transport to Exit


106/114

(2) Path for Accommodating Paper Longer Than A4L

To turn over and feed out of the copier paper longer than A4L (exceedTurnover Route Switching Solenoid is energized, thereby preventing a

The flapper retracts assoon as the leadingedge of the paperreaches it

The flathe wathe traimoves

Pressed

4002M581AA

Turnover Route Switching

Turnover Route SwSL6

✽ The broken line shows the operation when

Front

Rear

23. OTHER MECHANISM

23-1. Memory Backup

Image Processing Board Backup RAM• NVRAM (backup RAM) mounted on the Image Processing Board (P

Touch Panel-related adjustment values, and User’s Choice and othecounter values.• NVRAM has a built-in battery that ensures that the contents of the m


107/114

NVRAM has a built in battery that ensures that the contents of the meven when power to the copier and PWB-B is shut down, or when Nfrom the PWB-B.

NOTES

• When replacing the PWB-B, demount NVRAM from the old PWB-B a

PWB-B.

• When the NVRAM is replaced, it is necessary to make all settings a

contents of the memory. For the setting values, refer to the Adjust La

replacement.

✽ Paper Separator Corona voltage data entered on Adjust Label

The same Adjust Label as that used on other models is used for thithe Paper Separator Corona voltage data are to be entered at the lobelow.

ADJUST(PRINTER) SET S/No SETADJUST(EDH)

REGIST(CD)

REGIST(CD)

1st

2nd

3rd4thManual

LCTDUPLEX

600dpi

400dpi

600dpi

ZOOM(FD)FUSING INPUT

IDATDC(SET)

ADJUST(IR) SCH

SCH

SCH

SCHSCH

POSITION

LOOP(2)LOOP(1)

S-ADF(CD)

S-ADF(FD)FEED(CD)FEED(FD)

FEED(2)ZOOM(FD)

B1B2 *1*2

23-2. Flash Memory

• Flash memory is used for updating data when upgrading software.• Insert a memory card, in which data has previously been written, in

Memory Board and perform the updating procedure. This rewrites t

Applicable Boards: PWB-A, PWB-B

For details, refer to DIS/REASSEMBLY, ADJUSTMENT.


108/114

NOTE

NEVER attempt to remove or insert the memory card with the copier t

23-3. Dehumidifying Mechanism

(1) PC Drum Dehumidifying

A heater is used to prevent condensation from forming on the surfaceto changes in temperature and humidity.

Power Cord Power Switch D


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(2) Paper Dehumidifying Mechanism

A heater is used to prevent image transfer failure from occurring due tresult of variations in the environmental conditions (temperature and hthe copier.

Heater ON conditions IN OFF


H3 PWB-C PJ5C-2B L H

Power Cord Power SwitchP

Heater ON conditions IN OFF

40

Lower Syn

PC Drum H3

Front

Transport

Rear

Paper Dehumidifying heater H4

23-4. Cooling Mechanism

(1) IR Section Cooling Mechanism

A fan motor draws air from the outside into the inside of the copier to cthe Exposure lamp, and CCD Sensor), PH and PWB-B.

Speed Control Plugged in* Stand-byPH Cooling Fan Motor 1 M19 Stop Stop


110/114


PH Cooling Fan Motor 2 M22 Stop half

IR Cooling Fan Motor M52 Stop half


M19 PWB-IC PJ4IC-9 L H

M22 PWB-IC PJ4IC-3 L HM52 PWB-IC PJ4IC-6 L H

4002M5

IR CoolingM52

PH CoolingM22

PH CoolingM19

CCD

Developing Unit

IR

PH

PWB-B

(2) Fusing Section Cooling Mechanism

A fan motor draws air from the area around the Fusing Unit to the outscopier interior temperature from running high.


SpeedControl Plugged In* Wait Copy JAM Trouble

F

M23 stop Half Full Half Half


111/114

gg p


M23 PWB-C PJ13C-3 L H

Fusing Unit Cooling Fan Motor M23

IR

PH

PWB-B

Fusing Unit

Developing U

(3) Copier Interior Cooling Mechanism

A fan motor draws air from the inside of the copier to prevent the copiefrom running high. The Ozone Filter absorbs ozone produced inside th



F

M18 stop stop Full stop stop


112/114


M18 PWB-A PJ9A-5B L H

Ventilation Fan Motor M18

IR

PH

PWB-B

Fusing Unit

Developing U

Ozone Filter

(4) Power Supply Section Cooling Mechanism

A fan motor draws air from the area around the Power Supply Unit to tthe Power Supply Unit temperature from running high.


F

M15 stop Half Full stop stop

M16 stop Half Full Half Half


113/114



M15 PWB-A PJ6A-13 L H

M16 PWB-C PJ3C-3 L H

4002M5

IR

PWB-A

Air

PU1Air

Power Supply UMotor 1 M1

Air

PWB-C

Power Supply Unit Cooling Fan Motor 2M15


114/114

7661-4028-11 xxxxxxxx

Copyright2003 MINOLTA CO., LTD.

MINOLTA Co.,Ltd.

Use of this manual should be strictly supervised toavoid disclosure of confidential information.

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