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LASER PRINTERML-3050 SeriesML-3051ND/XAA
LASER PRINTER The keynote of Product
- Speed: Up to 28ppm (Ltr. 30ppm),1200x1200dpi Effective output
* This service manual is a property of Samsung Electronics Co., Ltd. Any unauthorized use of Manual can be punished under applicableinternational and/or domestic law.
* This service manual is also provided on the web, the ITSELF system Samsung Electronics Co., Ltd.http://itself.sec.samsung.co.kr
3.1 System Construction 3-13.2 Mechanical Parts Specifications 3-63.3 Engine H/W Specifications 3-153.4 S/W Descriptions 3-31
4. Alignment and Adjustments
4.1 Sample Pattern 4-14.2 Control Panel 4-24.3 Consumables and Replacement Parts 4-74.4 LED Status Error Message 4-74.5 Abnormal Image Printing and Defective Roller 4-104.6 How to use DCU 4-114.7 Paper Path 4-164.8 Download & Reset F/W 4-28
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-15.2 Disassembly and Reassembly 5-2
6. Troubleshooting6.1 6-16.2 The cause and solution of the bad discharge 6-86.3 The cause and solution of the malfunction 6-136.4 Toner Cartridge Service 6-196.5 The cause and solutions of bad environment of the software 6-27
7. Exploded Views & Parts List
7.1 Main 7-27.2 Cover Ass'y 7-47.3 Front Cover Ass'y 7-67.4 Rear Cover Ass'y 7-87.5 OPE Cover Ass'y 7-97.6 Frame 7-107.7 MP Ass'y 7-147.8 Main Drive Ass'y 7-167.9 Fuser Drive Ass'y 7-187.10 Duplex Unit (Optional) 7-197.11 Fuser Unit 7-217.12 Cassette Unit 7-23
8. Block diagram
8.1 System Block Diagram 8-18.2 System Timing Chart 8-2
Continued
9. Connection Diagram
9.1 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-110.2 OPE LCD 10-1410.3 OPE LED 10-1510.4 SMPS 110V 10-16
111. PrecautionsThe cautions below are items needed to keep in mind when maintaining and servicing.Please read carefully and keep the contents in mind to prevent accidents while servicing and to prevent themachine from getting damaged.
1.1 Safety Warning
(1) Request service by qualified service person.Service for this machine must be performed by a Qualified service person. It is dangerous if unqualified ser-vice personnel or users try to fix the machine.
(2) Do not rebuild. Do not attach or change parts discretionary. Do not dissemble, fix of rebuilt it. If so, printer will abnormallywork and electric shock or fire may occur.
(3) Laser Safety StatementThe Printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter Jfor Class 1(1) laser products, and elsewhere, is certified as a Class I laser product conforming to therequirements of IEC 825.Class I laser products are not considered to be hazardous. The laser system and printer are designed sothere is never any human access to laser radiation above a Class I level during normal operation, usermaintenance, or prescribed service condition.
Warning >> Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The reflectedbeam, although invisible, can damage your eyes. When using this product, these basic safety precautions shouldalways be followed to reduce risk of fire, electric shock, and injury to persons.
Samsung ElectronicsService Manual
Precautions
1-2
1.2 Safety Caution
1.2.1 Noxious Material Precaution
The toner in a printer cartridge contains a chemical material, which may harm human body if it is swallowed.Please keep children out of reach of the toner cartridge.
1.2.2 Electric Shock or fire Precaution
It is possible to get electric shock or burn by fire if you don't fallow the instructions of the manual.
(1) Use exact voltage. Please use an exact voltage and wall socket. If not, a fire or an electric leakage can becaused.
(2) Use authorized power cord. Do use the power cord supplied with PRINTER. A fire can happen when over cur-rent flows in the power cord.
(3) Do not insert many cords in an outlet. A fire can be occurred due to flow over current in an outlet.(4) Do not put water or extraneous matter in the PRINTER. Please do not put water, other liquid, pin, clip, etc. It
can cause a fire, electric shock, or malfunction. If this occurs, turn off the power and remove the power plugfrom outlet immediately.
(5) Do not touch the power plug with wet hand. When servicing, remove the power plug from outlet. Do not insertor take off it with wet hand. Electric shock can be occurr.
(6) Caution when inserting or taking off the power plug. The power plug has to be inserted completely. If not, a firecan be caused due to poor contact. When taking off the power plug, grip the plug and take it off. If grip the lineand pull over, it could be damaged. A fire or electric shock could happen.
(7) Management of power cord. Do not bend, twist, or bind it and place other materials on it. Do not fix with sta-ples. If the power cord gets damaged, a fire or electric shock can happen. A damaged power cord must bereplaced immediately. Do not repair the damaged part and reuse it. A repaired part with plastic tape can because a fire or electric shock. Do not spread chemicals on the power cord. Do not spread insecticide on thepower cord. A fire or electric shock can be happen due to thinner(weak) cover of the power cord.
(8) Check whether the power outlet and the power plug are damaged, pressed, chopped, or blazing fire or not.When such inferiorities are found, repair it immediately. Do not make it pressed or chopped when moving themachine.
(9) Caution when there is thundering or lightning, and being flash of lightening. It causes a fire or electric shock.Take the power plug off there is thunder. Do not touch cable and device when thundering and flash of lighten-ing.
(10) Avoid the place where is moisture or has dust. Do not install the printer where lots of dust or around humidifi-er. A fire can occurred. A plug part need to clean well with dried fabric to remove dust. If water drops aredripped on the place covered with dust, a fire can occurred.
(11) Avoid direct sunlight. Do not install the printer near window where direct contacts to the sunlight. If themachine contacts sunlight long time, the machine cannot work properly because inner temperature of themachine is getting hotter. A fire can occur.
(12) Turn off the power and take off the plug when smoke, strange smell, or sound from the machine. If you keepusing it, a fire can be occurred.
(13) Do not insert steel or metal piece inside/outside of the machine. Do not put steel or metal piece into a ventila-tor. An electric shock could happened.
Precautions
Samsung ElectronicsService Manual 1-3
1.2.3 Handling Precautions
If you ignore this information, you could harm machine and could be damaged.
(1) Do not install it on different levels, or slanted floor.Please confirm whether it is balanced or not after installation. If it is unbalanced, an accident can be hap-pened due to the machine falling over.
(2) Be careful not to insert a finger or hair in the rotating unit.Be careful not to insert a finger of hair in the rotating unit (motor, fan, paper feeding part, etc) while themachine is operating. Once it happens, you could be harmed.
(3) Do not place a pot containing water/chemical or small metals. If they got caught into the inner side ofmachine, a fire or electric shock can be occurred.
(4) Do not install it where lots of moisture or dust exists or where raindrop reaches. A fire or electric shockcan be caused.
(5) Do not place a candlelight, burning cigarette, and etc. on the machine. Do not install it near to heater. Afire can be occurred.
1.2.4 Assembly/Disassembly precaution
When replacing parts, do it very carefully. Memorize the location of each cable before replace parts for recon-necting it afterwards. Do memorize. Please perform the steps below before replace or disassembly the parts.
(1) Check the contents stored in the memory. All the information will be erased after replacing main board.The information needed to keep has to be written down.
(2) Before servicing or replacing electric parts, take off a plug. (3) Take off printer cables and power cord connected to printer.(4) Do use formal parts and same standardized goods when replacing parts.Must check the product name,
part cord, rated voltage, rated current, operating temperature, etc.(5) Do not give an over-force when release or tighten up the plastic parts.(6) Be careful not to drop the small parts such as screws in the printer.(7) Be careful not to change the location of small parts such as screws when assembling and disassembling.(8) Do remove dust or foreign matters completely to prevent fire of tracking, short, or etc.(9) After finished repair, check the assembling state whether it is same as before the repair or not.
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Precautions
1-4
1.3 ESD Precautions
Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly called“Electrostatically Sensitive (ES) Devices”, or ESDs. Examples of typical ESDs are: integrated circuits, some fieldeffect transistors, and semiconductor “chip” components.The techniques outlined below should be followed to help reduce the incidence of component damage caused bystatic electricity.
Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off anyelectrostatic charge on your body by touching a known earth ground. Alternatively, employ a commercially avail-able wrist strap device, which should be removed for your personal safety reasons prior to applying power to theunit under test.
2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface, suchas aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity of theassembly.
3. Use only a grounded tip soldering iron to solder or desolder ESDs.4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static” can
generate electrical charges sufficient to damage ESDs.5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to dam-
age ESDs.6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a compa-rable conductive material.
7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch theprotective material to the chassis or circuit assembly into which the device will be installed.
8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed, untilcompletely plugged or soldered into the circuit.
9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the brushingtogether of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electricity sufficient todamage an ESD.
Reference Information
Samsung ElectronicsService Manual 11-1
111111. Reference InformationThis chapter describes the reference information for applying this training manual, and it is consist-edof the tool list, the abbreviation table, the outline of model, and so on.
11.1 Troubleshooting Tool
The following tools are recommended safe and easy troubleshooting as described in this service manual.
• DVM(Digital Volt Meter)Standard : Indicates more than 3 digits.
• TweezersStandard : For general home use, small type.
• Cotton SwabStandard : For general home use, for medical service.
• Cleaning EquipmentsStandard : An IPA(Isopropyl Alcohol)dry wipe tissue or
a gentle neutral detergent and lint-free cloth.
• Vacuum Cleaner
• Spring HookStandard : For general use
• Software (Driver) installation CD ROM
Service Manual
Reference Information
11-2Samsung Electronics
11.2 Acronyms and Abbreviations(1)
The table below explains the abbreviations and acronyms used in this service manual. Where abbreviationsor acronyms are used in the text please refer to this table.
Abbreviations Explanation
AP Access Point
AC Alternating Current
APC Auto Power Control
ASIC Application Specific Integrated Circuit
ASSY assembly
BIOS Basic Input Output System
BLDC Brush-less Direct Current
CMOS Complementary Metal Oxide Semiconductor
CN connector
CON connector
CPU Central Processing Unit
dB decibel
dbA decibel A
dBM decibel milliwatt
DC direct current
DCU Diagnostic Control Unit
DPI Dot Per Inch
DRAM Dynamic Random Access Memory
DVM Digital Voltmeter
ECP Enhanced Capability Port
EDC Embedded Diagnostic control
EEPROM Electronically Erasable Programmable Read Only Memory
EMI Electro Magnetic Interference
EP electrophotographic
EPP Enhanced Parallel Port
FPOT First Printout Time
F/W firmware
GDI graphics device interface
GND ground
HBP Host Based Printing
HDD Hard Disk Drive
H/H High temperature and high marshy place
HV high voltage
HVPS High Voltage Power Supply
I/F interface
I/O Input and Output
IC integrated circuit
IDE Intelligent Drive electronics or Imbedded Drive Electronics
Reference Information
Samsung ElectronicsService Manual 11-3
Acronyms and Abbreviations(2)
Abbreviations Explanation
IEEE Institute of Electrical and Electronics Engineers. Inc
IPA Isopropy Alcohol
IPM Images Per Minute
LAN local area network
lb pound(s)
LBP Laser Beam Printer
LCD Liquid Crystal Display
LED Light Emitting Diode
L/L Low temperature and low marshy place
LSU Laser Scanning Unit
MB megabyte
MHz megahertz
MPF Multi Purpose Feeder
NIC Network Interface Card
N/N Normal temperature and normal marshy place
NVRAM nonvolatile random access memory
OPC Organic Photo Conductor
OPE Operate Panel Equipment
PBA Printed Board Assembly
PCL Printer Command Language , Printer Control Language
PDL Page Discription Language
PPM Page Per Minute
PPS Pulse Per Second
PS Post Script
PTL Pre-Transfer Lamp
PWM Pulse Width Modulation
Q-PID Quick Printer Initiating Device
Q ty quantity
RAM Random Access Memory
ROM Read Only Memory
SCF Second Cassette Feeder
SMPS Switching Mode Power Supply
SPGP Samsung Printer Graphic Processor
SPL Samsung Printer Language
Spool Simultaneous Peripheral Operation Online
SW switch
sync synchronous or synchronization
USB Universal Serial Bus
WECA Wireless Ethernet Compatibility Alliance
Service Manual
Reference Information
11-4Samsung Electronics
11.3 Selecting printer locations
• Leave enough room to open the printer trays, covers, and allow for proper ventilation. (see diagrambelow)
• Provide the proper environment :- A firm, level surface- Away from the direct airflow of air conditioners, heaters, or ventilators- Free of extreme fluctuations of temperature, sunlight, or humidity- Clean, dry, and free of dust
Reference Information
Samsung ElectronicsService Manual 11-5
11.4 Sample Tests Patterns
The sample patterns shown below are the standard test patterns used in the factory.The life of the toner cartridge, developer cartridge and printing speed are measured with the pattern shownbelow (5%). The A4 ISO 19752 standard pattern samples are reproduced reduced to 70% of the actual A4size.
A4 ISO 19752 Standard Patterns
Product Specifications
Samsung ElectronicsService Manual 2-1
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2.2 SpecificationsProduct Specifications are subject to change without notice. See below for product specifications.
2.2.1 General Print Engine
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Engine Speed Simplex Up to 28 ppm in A4 (30 ppm in Letter)
Duplex N/A Up to 19 ipm in A4 (21ipm in Letter)
Warmup time From Sleep Less than 20 sec, Cold warm-Up time : 35ec
FPOT From Ready Less than 8.5 sec
From Idle Less than 28.5 sec
From Coldboot Less than 43.5 sec
Resolution - Up to 1,200 x 1,200 dpi effective output
Supporting OS Microsoft Windows 98/ME/2000/XP/2003Microsoft Windows NT 4.xMac OS 8.6 andaboverVarious Linux OS including Red Hat,Caldera, Debian, Mandrake, Slackware, SuSEand Turbo LinuxNovell 4.x,5.x,6.x
Supporting OS Microsoft Windows 98/ME/2000/XP/2003Microsoft Windows NT 4.xMac OS 8.6 andaboverVarious Linux OS including Red Hat,Caldera, Debian, Mandrake, Slackware, SuSEand Turbo LinuxNovell 4.x,5.x,6.x
Application RCP N/A
Status Monitor N/A
Smart Panel YES (RCP,SM)
Network Management External : SAS (Samsung SAS (Samsung Admin Service), SetIPAdmin Service), SetIP
PCL6: Win95/98/NT4.0/2000/Me/XP/2003SPL: Linux, MacPS3: N/A (Factory Option)KS/KSSM: DOS
External : MicrosoftWindows 98/ME/2000/XP/2003MicrosoftWindows NT 4.xMac OS10.3Various Linux OSincluding Red Hat,Caldera, Debian,Mandrake, Slackware,SuSE and TurboLinuxNovell 4.x,5.x,6.x
External : MicrosoftWindows 98/ME/2000/XP/2003MicrosoftWindows NT 4.xMac OS10.3Various Linux OSincluding Red Hat,Caldera, Debian,Mandrake, Slackware,SuSE and TurboLinuxNovell 4.x,5.x,6.x
Product Specifications
Samsung ElectronicsService Manual 2-3
ML-3050 SERIES ML-3050 ML-3051N ML-3051ND
Interface
Parallel - IEEE 1284
USB - USB 2.0
Wired Network - Optional (External) Ethernet 10/100 Base TX (Internal)
ML-305X is consisted of the Engine parts and F/W, and said engine parts is consisted of the mechanical parts comprisingFrame, Feeding, Developing, Driving, Transferring, Fusing, Cabinet and H/W comprising the main control board, powerboard, operation panel, PC Interface.
In ML-305X, the main controller is consisted of Asic(SPGPv3) parts, Memory parts, Engine Interface parts and itfunctions as Bus Control, I/O Handling, drivers & PC Interface by CPU.Memory Access supports 16bit Operation, and Program Memory 32MB and Working Memory as well.In ML-305X, the paper path is consisted of 250 sheets Cassette containing friction Pad, pickup-roller, feed-roller for functioning as registration, Earth-transfer for guiding the transfer inlet, Guide-Tr for guiding sheetsbetween transferring and fixing, Fuser, Exit Assy.In ML-305X, the driving device is consisted of f55 BLDC motor, OPC, Pick-up, Feed, Gear-Train connected withMounting member. - to be changed
3.1.2 System Layout
Roller-Heat
Roller-Exit
Roller-Transfer
Roller-PickupRoller-Feed
Roller-MP
Roller-Pressure
Roller-REGIOPC
DuplexDuplex
Roller-REGIOPC
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System Overview
3-2
3.1.2.1 Feeding SectionFeeding Method : Universal Cassette Type
3.1.2.2 Transfer Ass’yIn Warranty( Life time) : Within 70,000 sheets printing
System Overview
Samsung ElectronicsService Manual 3-3
3.1.2.3 Driver Ass’yMAIN Motor ass’y is for Cassette,MPF and Toner Cartridge
EXIT Motor ass’y is for fuser,exit roller and the initial duplexing feeding
DUPLEX Motor assembly is for duplexing feeder on the ML-3051ND only
3.1.2.4 Fuser Ass’yFusing Type : E-Coil type
Heat Roller : [ 28.3 with 0.1 Crown ]
Pressure Roller : [electrically conductive]
Thermistor - Temperature Detecting Sensor
Thermostat - Overheat Protection Device
Drive Ass’y
Duplex Drive Ass'y
ConnectionPCB
Duplex Motor
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System Overview
3-4
3.1.2.6 Toner CartridgeOPC Cleaning :Mechanical Cleaning by the cleaning blade.
The recycled toner : Trash room for the recycled toner
No shutter for protecting the OPC Drum
3.1.2.5 LSULSU is consist of LD(Laser Diode) and polygon motor control. When the controller generate the printing signal LD willturn on and Polygon motor starts.If the receiving part in LSU detect the beam and then Hsync is generated. When therotation of poygon motor is steady, it is time of LSU ready status for printing. If either of two condition is not satisfied,LSU error is expected.
Trouble Failure AnalysisPolygon Motor Error No steady rotation of Polygon Motor
Hsync Error In spite of steady rotation of Polygon Motor, There is no generation of the Hsync signal
Cleaning Roller
Cleaning Blade
-650V
0.16mW
200V-1.25KV
VDC = -460VVPP = 1520V, f = 2.5KHz, Duty(-) = 32%
1
2
3
4
5
6
7
8
+4.2kV
-50V
+-
System Overview
Samsung ElectronicsService Manual 3-5
3.1.2.7 Duplex UnitDuplex printing function as factory option
Available Paper : Letter, Legal, Folio, Oficio and A4
3.1.2.8 Optional Tray ( SCF)For customer covenience in managing paper
Capacity : 250 sheets
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System Overview
3-6
3.2 Mechanical Parts Specifications
3.2.1 Frame
Material : PC + ABS V0 NH-1000T(Cheil Industries)Weight : 1.0kg
3.2.2 Feeding Part
Feeding Type : Universal Cassette TypeFeeding Standard : Center LoadingFeeding Qty : Cassette 250 sheets (75g/ , 20Ib paper standard)
MPF 500 sheets (75g/ , 20Ib paper standard)Special Media 5 sheets in MPF (OHP, Envelope, Label, Post Card, Index Paper etc.)
Separating Type : Cassette-Friction Pad TypeMPF-Friction Pad Type
Driver Type : Driving by Gearing from Main MotorPick Up Roller Driver : SolenoidPick Up Roller Rubber Material : EPDM + IR = 1.6 or morePick Up Velocity : 143.12 203.21mm/sec (Process : 124.95 179.7mm/sec)Paper detecting Sensor : Photo SensorPaper Size Sensor : NonePaper Separating Pad Material : NBB 52 = 0.8~1.2Separating Pad Pressure : 190gfPick Up Roller RPM 97.623 140.6RPMFeeding Pressure (Cassette) : 250 gf 10% (SPRING H mm, based on 1 sheet)
It is consisted of PTL(pre-transfer lamp) and Transfer Roller. The PTL sends a light to the OPC drum, makes the currenton the drum surface to low, and improve the transfer efficiency.The transfer roller delivers the toner of the OPC drum to the paper.
Velocity : 183.02 mm/sec (Drum Velocity x 102.53%)TR Voltage : +1.3KV 5% (based on 200 , in accordance with media area, Transfer table)
-1.20KV 10% (In cleaning)Transfer Trigger Current : 6.5 5%Transfer Efficiency : 85% or more (All envirmnment : preferable media)Voltage System : Voltage PWM Control SystemTransfer Roller- Material : NBR FOAM ROLL- Structure : Mono layer- Resistance : 3E +07 ~ 8E +07 (N/N)- Hardness : 40 3% (ASKER-C)- Validlength : 224.2 +0.5/-0mm- OD : 15.0 0.5mm- SHAFT Material : SUM -24L + Non-electrolysis Ni. CoatingLife Span : Print over 70,000 sheets (in 15~30 )
3.2.4 Driver Ass’y
3.2.4.1 Motor
Spec : BLDC 55 + PM 49 Motor (2-2 Bipolar) + PM 42 Motor (2-2 Bipolar)Pull-Out Torque :- BLDC 55 : 1350 gf. cm(based on actual value) or more (1342rpm, 1.2A(rms))- PM 49 : 1600 gf. cm(based on actual value) or more (714pps, 1.1A(rms))- PM 42 : 600 gf. cm(based on actual value) or more (925pps, 0.9A(rms))
TORQUE MARGIN (Tp/0 Tsys) : BLDC 55 : 1350/1047 gf. cm = 1.29- PM 49 : 1600/809 gf. cm = 1.97- PM 42 : 600/210 gf. cm = 2.85
It is a power delivery unit by gearing : BLDC Motor -> Pickup/Feeder/Devloper- PM 49 Motor -> Fuser/Exit- PM 42 Motor -> Duplex
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System Overview
3-8
3.2.4.2 Process Speed
Print Speed : 28/30 PPM (based on A4/LTR)Opc Drum Vp : 179.7mm/secUnit Relative Velocity (Paper Speed)- Pickup : 206.21mm/sec), 14.75% VS OPC Vp- Feeder (Cassette) : 183.79mm/sec, 2.28% VS OPC Vp- Feeder (Frame) : 181.64mm/sec, 1.08% VS OPC Vp- Transfer : 184.25mm/sec, 2.53% VS OPC Vp- Fuser : 179.3653mm/sec, 0.19% VS OPC Vp
Jitter- Vertical : 3 0.018 or less in Vision System- Horizontal : within 2% of partial magnificence error
Orthogonality : SPEC : 1.0mm or less
3.2.4.3 Acoustic Noise
Warming Up : 49dB or lessPrinting : 54dB or lessStand-by : 39dB or less
System Overview
Samsung ElectronicsService Manual 3-9
3.2.5 Fixing Part (Fuser)
The fuser is consisted of the E-Coil, Heat Roller, Pressure Roller, Thermistor and Themostat.It adheres the toner to the paper with pressure and a heat to complete the printing job.
Rubber- Material : Silicon Sponge (Tubing Type : 32)- Length : 226.4mm- Thickness : 6mm(one-side)
OD : 32.25 0.2(Center part Crown -0.35)
3.2.5.6 Media Separating System
Thflon Coating with PEEK Claw System
3.2.5.7 Safety Relevant Facts
Proteciong device when overheating- 1st protecting device : H/W cuts off when detecting an overheating- 2st protecting device : S/W cuts off when detecting overheating- 3st protecting device : Thermostat cuts off the power
Safety device- The power of Fuser is cut-off after front cover is open- The overheating safety device for customer- The surface temperature of the Fuser Cover is under 80
System Overview
Samsung ElectronicsService Manual 3-11
3.2.6 LSU (Laser Scanner Unit)
The LSU unit is controlled by video controller. It scans the video data received from video controller with laser beam byusing the rotation principle of the polygon mirror to create the latent image on the OPC drum. It is the core part of LBP.
The OPC drum rotates as the same speed as the paper feeding speed. It creates the /HSYNC signal and sends it to theengine when the laser beam of the LSU reaches the end of the polygon mirror, and the engine detects the /HSYNC signalto arrange the vertical line of the image on the paper. After detecting the /HSYNC signal, the image data is sent to theLSU to arrange the its margin on the paper.
The one side of the polygon mirror is one line for scanning.
Item Specification Item
Resolution Real 600 dpi main direction sub direction
Spot Size Main 75 +20/-20 -beam diameter at the level of 1/e2of intensity
-at the spot location of 0, 100 of image height
Variation 40 /50 main/sub, within image height of -100 ~ +100 range
LaserProperty Wavelength 785 +10/-15 at 25
Power 0.33 0.02 at the center of image on the focal plane, with stationary condition,power supplied at DC 5 volt
Vignetting Min 80 % spot power variation within imageheight of -100 ~ +100
f Property Magnification error Max 0.7 % based on the printable area, 216
Partial Magnification error max 1.5 % based on the 2.54 width within theprintable area, 216
Beam Position Deviation of main scanning 1.0 at the center of image
Deviation of sub scanning 1.0
Scan Line Bow Max 1 within image height
Property Skew Max 1 -100 ~ +100 range
Sync. Property Position 136.7 1.0 distance to synchronization positionfrom the center of image
Pulse width Min 5.0 sec pulse width of synchronization
Pitch Error Neighbor line Max 10 Pitch error in sub scanning directionwithin image height of -105 ~ +105 range
Within 6 lines Max 20 within image height of -105 ~ +105 range
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System Overview
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Item Specification Item
Unit assembly state 5
Motor Control PWM control external clock(TTL pulse)
Direction of rotation CCW
Rotational speed 31836.6 rpm normal rotational speed (30ppm)
Rising time Max 6.0sec time to stable rotational speed
Mirror Facet number 4 faces
Inner diameter 14.14
Jitter LF Max 0.030 % within image height of
RF Max 0.020 % -105 ~ +105 range
Motor Driver Supply voltage 24 V 10 % application voltage to the drivingcircuit of polygon motor
Starting current Max 2.0 A required current for acceleration
Running current Max 1.0 A required current to stable rotationalspeed
Scanning Effective scanning width 216
Property Scanning freq. 2,122.44 one line scanning frequency
Scanning time 471.15
Scanning dot 5,102 dots
1 dot ON time 53.86 time interval from falling 0.9VH torising again 0.9VH
Scanning effective 58.3%
Video freq. 18.5648 MHz frequency of video data
Process Speed 179.7 mm/s Drum Speed
Environment Acoustical noise 45dB at normal operation condition,measuring at 1 m horizontal, 0.75mvertical apart
Use Temperature +10 ~ +50
Humidity 30 ~ 80 %
Preservation Temperature -20 ~ +60
Humidity 10 ~ 90 %
Size W L H
System Overview
Samsung ElectronicsService Manual 3-13
3.2.7 Toner Cartridge
In the toner cartridge, the OPC unit and the developer unit are in a body.
The OPC unit has OPC drum and charging roller, and the developer unit has toner, toner cartridge, supply roller,developing roller, and the blade.
3.2.7.1 SummaryDeveloping Method : Non magnetic 1 element contacting method
Toner : Non magnetic 1 element shatter type toner
Charging capacity : -39.1 3 C/g (KAO meas. method)
Average OD : 8.0 0.5 (Toner)
Toner Qty : 85 gf/140gf (4k / 8k)
The life span of toner: 4k/8k sheets (ISO 19752 5% Pattern / A4 standard )
Toner Residual Sensor : Dot count with CRUM(CRU Monitor)
OPC Cleaning : Collect the toner by using cleaning blade+ FILM OPC
Handling of wasted toner : Collect the wasted toner in the cleaning frame by using cleaning blade
OPC Drum Protecting Shutter : None
Classifying device for toner cartridge: ID is classified by interruption of the frame channel.
3.2.7.2 Developing Roller Roller type : conductive elastic roller
Rotary Speed : 203.06 mm/sec
Roller Bias : -220V ~ -400 20V
Control Type : Bias PWM Control type
Roller material : Conductive NBR + Surface UV process - Structure : Mono layer
- OD : 12.0 0.05 mm - Shaft Material : SUM-24L + Non-electrolysis Ni Coating
- Shaft OD : 6 + 0 / -0.05 mm - Driver : Gear Driver
- Pressure : L:300 gf / R:350 gf
- Roller surface roughness : Ra 1.8 um or less (shaft direction)
- Roller life : 8,000 sheets or more
Roller Voltage : -1.25 ~ -1.70 KV
System Overview
Samsung ElectronicsService Manual 3-15
3.3 Engine H/W Specifications
3.3.1 ML-305X (PCL) Main Board
The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and print part infunctional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC interface. The main boardsends the Current Image of Video data to the LSU and manages the conduct of Electrophotography for printing. It isconsisted of the circuits of the motor (paper feed, pass) driving, clutch driving, pre-transfer lamp driving, current driving,and fan driving.The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main board.
3.3.1.1 Asic(SPGPv3)
CPU Core : ARM1020E- 32KB instruction cache and 32KB data cacheOperating Frequency- CPU Core : over 300MHz- System Bus : 100MHz SDRAMC- 32Bits Only, 100MHz- 5 Banks (Up to 128MB per Bank)ROMC- 4 Banks (Up to 16MB per Bank)IOC- 6 Banks (Up to 16MB per BankDMAC- 4 ChannelsHPVC- Dual/Single Beam - LVDS Pad(VDO, HSYNC)UART- 5 Channels (1 Channels Supports DMA Operation)PCI Controller- 32Bits, 33/66MHz- PCI Local Bus Specification rev2.2 Complaint- Host / Agent Mode (Support 4 Devices in Host Mode)NAND Flash Controller- 8/16Bits, H/W EEC Generation- Auto Boot Mode (Using Internal SRAM, 4KB)MAC- 10M/100Mbps- Full IEEE 802.3 CompatibilityEngine Controller- LSU Interface Unit- Step Motor : 2 Channels- PWM : 8 Channels- ADC : 6 ChannelsI2C Controller- I2C(S-BUS) Slave Device Support(I2C Version 2.1)RTC- RTC Core Voltage : 3VPLL- 3 PLL : MAIN, PCI, PVC
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3.3.1.2 Memory
Flash Memory : It stores System Program and downloads the System Program through PC Interface, and in case ofmodel for export it compresses the PCL font, then stores it. - Capacity : 32M Byte (NAND Flash)- Random Access Time : 10 us (Max)- Serial Page Access Time : 50ns (Min)DRAM : It is used as Swath Buffer, System Working Memory Area, etc. when printing. It stores Font List, compressed into Flash memory, on DRAM and uses it as PCL font in case of model for export.- Capacity : 64M Byte(Basic), up to 320Mbyte (User Option)- Type : SDRAM 100MHz/133MHz , 16bit
3.3.1.3 Others
The Option PBA can be mounted for supporting the serial communication.
Main boardMain board
PHY ICPHY IC
USB ICUSB IC
SPGPv3SPGPv3(ASIC)(ASIC)
SRAMSRAM
SDRAMSDRAM
Flash ROMFlash ROM
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3.3.1.4 SPGPv3 Internal Block Diagram
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3.3.1.5 Flash Memory
It stores the system program and downloads system program through the PC Interface.Capacity : 32M Byte (NAND Flash)Random Access Time : 10 us (Max)Serial Page Access Time : 50ns (Min)
3.3.1.6 SDRAM
It is used as swath buffer, system working memory area, etc. while Printing. Capacity : The 64M Byte is for this model (64M :Printing System Working Memory Area )
3.3.1.7 Sensor Input Circuit
3.3.1.7.1 Paper Empty Sensing
The Paper empty sensor (Photo Interruptor) on the HVPS informs the state of paper to CPU whether it is empty or notwith operation of the actuator.When cassette is empty, it detects the fact by reading the E20 of CPU, and then informs the fact by displaying the RED.
3.3.1.7.2 MP Sensing
By operation of Actuator on the frame, MP Sensor (Photo interruptor) on the HVPS informs the state of paper to CPUwhether it is empty or not. It reads the D17 of CPU for recognizing paper in MP, and paper is fed from MP if there is.
3.3.1.7.3 Paper Feeding/With Toner Cartridge Sensing
When paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the paper feedingstate to CPU, and then sprays the image data after certain time.If it doesn t detect the feed sensor within 1sec. after paper is fed, paper Jam0 is occurred (LED will be display REDcolor). The fact whether the developer is inserted or not is detected by CRUM. After the developer is mounted, the sub-CRUM can read the information of toner cartridge from contact with CRUM involved in toner cartridge. If the information oftoner cartridge is invalid, it will show invalid sign on a LCD or LED.
3.3.1.7.4 Paper Exit Sensing
It detects paper state whether paper gets out from the set with operation of exit sensor on the HVPS and actuator on theframe. Paper detects the on/off time of exit sensor by reading D22 of CPU, and the normal operation or jam information isinformed to the CPU.The paper JAM2 is informed. (LED will be display RED color)
3.3.1.7.5 Cover Open Sensing
The Cover open sensor is located on the HVPS. After the front cover is opened, +24VS (DC fan, Solenoid, Main Motor,Polygon motor part of LSU and HVPS), which is supplied to the each unit, is cut off. The cover-open sensing is operatedby the D23 of CPU.In case, the red will be ON for informing the facts to user.
System Overview
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3.3.1.7.6 DC FAN / SOLENOID Driving
It is driven by transistor and controlled by D14(FAN MAIN), E16(FAN DUPLEX), C23(PICK-UP CLUTCH), C18(REGICLUTCH), D15(MPF CLUTCH) of CPU.When it is high, the fan is driving by turning on the TR, and it is off when the sleep mode is selected. There are threesolenoids, and they are driven by paper pick-up, regi and MPF signal. It is turned on or off by C23, C18, D15 of CPU. Thediode protects the driving TR from the noise pulse, which is flown when the solenoid id de-energizing.FAN Driving Circuit is driven by Transistor, and controlled by D14, E16 of CPU.
3.3.1.7.7 Motor Driving
The main motor driving circuits is on the BLDC Motor Ass y Unit. Main Controller has the interfacing circuits. There ismotor driver IC on the motor control board of Motor Ass y Unit.
The exit motor driving circuits is formed when the driver IC is selected. The AN44060A Motor Driver IC is used in thiscase. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltagevalue. The motor driving voltage is calculated with the following formula.
The motor driving circuit is formed when the Driver IC is selected. The A3977 Motor Driver IC is used in this case. Theresistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. Themotor driving voltage is calculated with the following formula. I = Vref / Rs, wherein Vref is (R1 5V) / (R1+R2).
IN 0, 2 IN 1, 3 Output Current
L L Vref / (10*Rs) = Iout
H L Vref / (15*Rs) = Iout * 2/3
L H Vref / (30*Rs) = Iout * 1/3
H H 0
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3.3.2 SMPS & HVPS board
The SMPS supplies DC Power to the System.It takes 110V/220V and outputs the +5V, +24V to supply the power to the main board. The HVPS board creates the highvoltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best condition to display the image. TheHVPS part takes the 24V and outputs the high voltage for THV/MHV/BIAS, and the outputted high voltage is supplied tothe toner, OPC cartridge, and transfer roller.
3.3.2.1 HVPS (High Voltage Power Supply)
Transfer High Voltage (THV+) - Input Voltage : 24 V DC 15% - Output Voltage : MAX +5.0KV 5 %,(Duty Variable, no loading )
->1.2KV 15% (when cleaning,200 ) - Output Voltage Trigger : 6.5 - Input contrast of the Voltage stability degree :under 5 % (fluctuating input 21.6V 26.4V) Loading contrast : 5 % or less
- Output Voltage Rising Time : 100 ms Max - Output Voltage Falling Time : 100 ms Max - Fluctuating transfer voltage with environmental various : +650 V(Duty 10%) ~ 5 KV (Duty 90%) - Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It detects the resistanceby recognizing the voltage value, F/B, while permits the environmental recognition voltage.
- Output Voltage Control Method : Transfer Output Voltage is outputted and controlled by changing Duty of THVPWMSignal. 10% Duty : +650V, 90% Duty : +5KV 5%
Charge Voltage (MHV) - Input Voltage : 24 V DC 15% - Output Voltage : -1.3KV ~ -1.8KV DC 50V - Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max - Output Loading range : 30 M ~ 1000 M- Output Control Signal(MHV-PWM) : CPU is HV output when PWM is LowCleaning Voltage (THV-)- The (+) Transfer Voltage is not outputted because the THV PWM is controlled with high. - The (-) Transfer Voltage is outputted because the THV-Enable Signal is controlled with low- The output fluctuation range is big because there is no Feedback control. Developing Voltage (DEV) - Input Voltage : 24 V DC 15% - Output Voltage: -200V ~ -600V DC 20 V - Output Voltage Fluctuation range: PWM Control - Input contrast of the output stability degree : 5 % or lessLoading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max - Output Loading range : 10M ~ 1000 M- Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low. Supply - Output Voltage : -400 V ~ -800V DC 50 V(ZENER using, DEV ) - Input contrast of the output stability degree : under 5 %Loading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max- Output Loading range : 10 M ~ 1000 M- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.
System Overview
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3.3.2.2 SMPS (Switching Mode Power Supply)
It is the power source of entire system. It is assembled by an independent module, so it is possible to use for commonuse. It is mounted at the side of the set.It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater control part,which supplies the power to fuser. SMPS has two output channels. Which are +5V and +24V.
AC Input - Input Rated Voltage : AC 220V ~ 240V AC 110V ~ 127V- Input Voltage fluctuating range : AC 198V ~ 264V AC 99V ~ 135V- Rated Frequency : 50/60 Hz- Frequency Fluctuating range : 47 ~ 63 Hz- Input Current : Under 4.0Arms / 2.0Arms (But, the status when e-coil is off or rated voltage is inputted/outputted )
HVPS PBAHVPS PBA
SUPPLY-630 3%
THV+1300 3%-1200 3%
OPC -130 15.4%
MHV-1350¡ 3%
DEV-430 3%
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NO ITEM CH1 CH2 Remark
1 CHANNEL NAME +5V +24.0V
2 CONNECTOR PIN CON 35V PIN: 11,13,15 CON 324V PIN:3,5,7,9GND PIN: 12,14,16 GND PIN:4,6,8,10
9 Protection for loading Shut down or Fuse Shut down or Outputshortage and Protection Voltage Dropoverflowing current
NO ITEM System
1 Stand-By Less than 150W
2 PRINTING Less than 400W
3 Sleep-Mode Less than 11W
Fuse 5VFuse 5V
Fuse 24VFuse 24V
Fuse 5VFuse 5V
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Length of Power Cord : 1830 50mmPower Switch : Use Feature - Insulating Resistance : 100 or more (at DC 500V) - Withstanding Voltage : Must be no problem within 1 min. (at 1000V-LV model / 1500Vac-HV model,10mA)
- Leaking Current : under 3.5mA - Running Current : under 40A PEAK (AT 25 , COLD START)
under 60A PEAK (In other conditions) - Rising Time : within 2Sec - Falling Time : over 20ms - Surge : Bi-Wave 3kV ? Normal, 6KV - Common Environment Condition- Operating temperature range : 0 40- Maintaining temperature range : -25 85- Preserving Humidity Condition : 30% 90% RH- Operating atmospheric pressure range : 1atm EMI Requirement : CISPR ,FCC, CE, MIC, C-Tick, Safty Requrement :IEC950 UL1950, CSA950, C-UL,NOM, TUV, Semko, Nemko, iK, CB, CCC(CCIB), GOST, EPA,Power Save
3.3.2.3 FUSER AC POWER CONTROL
Fuser(e-coil) gets heat from AC power. The AV power controls the switch with the Triac, a semiconductor switch. TheON/OFF control is operated when the gate of the Triac is turned on/off by Phototriac (insulting part).In other words, the AC control part is passive circuit, so it turns the heater on/off with taking signal from engine controlpart.When the HEATER ON signal is turned on at engine, the LED of PC501 (Photo Triac) takes the voltage and flashes.From the flashing light, the Triac part (light receiving part) takes the voltage, and the voltage is supplied to the gate ofTriac and flows into the Triac. As a result, the AC current flows in the e-coil, and heat is occurred.On the other hand, when the signal is off, the PC501 is off, the voltage is cut off at the gate of Triac, the Triac becomesoff, and then the e-coil is turned off.
Triac (Q501) feature : 24A-LV model / 16A-HV model, 600V SWITCHING Phototriac Coupler (PC501) - Turn On If Current : 15mA 50mA(Design: 16mA)- High Repetive Peak Off State Voltage : Min 600V
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3.3.3 Engine F/W
3.3.3.1 Control Algorithm
3.3.3.1.1 Feeding
If feeding from a cassette, the drive of the pickup roller is controlled by controlling the solenoid. The on/off of the solenoidis controlled by controlling the general output port or the external output port. While paper moves, occurrence of Jam isjudged as below.
3.3.3.1.2 Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width Modulation). Theeach output voltage is changeable due to the PWM duty. The transfer voltage admitted when the paper passes thetransfer roller is decided by environment recognition. The resistance value of the transfer roller is changed due to thesurrounding environment or the environment of the set, and the voltage value, which changes due to the environments, ischanged through AD converter. The voltage value for impressing to the transfer roller is decided by the changed value.Each voltage value is controlled according to 3.3.3.2 Timing Chart.
ITEM Description
JAM 0 - After picking up, paper cannot be entered due to paper is not fed.
- After picking up, paper entered but it cannot reach to the feed sensor in certain time due to slip, etc.
- After picking up, if the feed sensor is not on, re-pick up. After re-picking up, if the feed sensor is not onafter certain time, it is JAM 0.
*It is a status that the leading edge of the paper doesn t pass the feed sensor.
-Even though the paper reaches to the feed sensor, the feed sensor doesn t be ON.
*It is a status that the leading edge of the paper already passes the feed sensor.
JAM 1 - After the leading edge of the paper passes the feed sensor, the trailing edge of the paper cannot passthe feed sensor after a certain time. (The feed sensor cannot be OFF)
- After the leading edge of the paper passes the feed sensor, the paper cannot reach the exit sensor aftercertain time. (The exit sensor cannot be ON)
*The paper exists between the feed sensor and the exit sensor.
JAM 2 - After the trailing edge of the paper passes the feed sensor, the paper cannot pass the exit sensor aftercertain time.
System Overview
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3.3.3.1.3 Fusing
The temperature change of the heat roller s surface is changed to the resistance value through the thermistor. Byconverting the voltage value, which impressed to the resistance, to the digital value through the AD converter, thetemperature is decided. The AC power is controller by comparing the target temperature to the value from the thermistor.If the value from the thermistor is out of controlling range while controlling the fusing, the error stated in the below tableoccurs.
Open Heat Error
When the engine operates the warm-up process, if the temperature of the fixing unit is not higher than a specifiedtemperature, the engine defines Open Heat Error. When this error is broken out, the engine stops all functions and keepsthe error state. Also, the engine informs the error status of the main system. And then the error message is displayed atLCD window or LED informing the error status of the user.
Low Heat Error
When the engine is at stand-by, printing or warm-up mode, if the temperature of the fixing unit is lower than the specifiedtemperature at each state and the lower temperature state is maintained during the specified time, the engine definesLow Heat Error. When this error is broken out, the engine stops all functions and keeps it at the error state. Also theengine informs the error status of the main system. And then the error message is displayed at LCD window or LEDinforming the error status of the user.
Over Heat Error
For overall engine state, if the temperature of the fixing unit is higher than the specified temperature and the temperaturestate is kept during the specified time, the engine defines Over Heat Error. When this error is broken out, the engine stopsall functions and keeps it at the error state. Also, the engine informs the error status of the main system. And then theerror message is displayed at LCD window or LED to inform the error status of the user.
* To recover the heat error: The heat error recovery is operated automatically when the error is only caused by Low HeatError, not the Heat Errors in Warm-up state and the Over Heat Error. If an error happens, then the engine memorizes apresent temperature. In case of Low Heat Error, the maximum heat is supplied to the fixing unit. When a specified timeis elapsed, the engine detects the temperature again. If the present temperature is higher than the memorizedtemperature, the error is recovered. In case of Over Heat Error, no heat is supplied to the fixing unit. When a specifiedtime is elapsed, the engine detects a present temperature again. If the present temperature is a specified degree lowerthan the memorized temperature, the error is recovered.
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3.3.3.1.4 LSU
LSU receives the image data from PVC or HPVC and make the latent image on OPC surface.It uses the dual beam, LD1 and LD2. But the control method of them is the same.Just in comparison with the single beam, the dual beam has the half of lsu s frequency. ->The frequency of the dual beam = the frequency of the single beam /2. The errors related to LSU are as follows:
* By LReady: When the printing is started, the engine drives the polygon motor of LSU. After the specified time is elapsed,if the motor is not in a ready status, the engine detects the error that the polygon motor is not in a ready status. If thiserror happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status ofthe main system and the error message is displayed at LCD window to inform the error status of the user.
* By Hsync: When the polygon motor is ready, the LSU sends out the signal called Hsync and used to synchronize witheach image line. So, if the engine does not detect consecutively the signal for a fixed time, it defines the Hsync Error. Ifthis error happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error statusof the main system and then the error message is displayed at LCD window to inform the error status of the user.
LSU Error Recovery: If the LReady or Hsync error happens, the paper exits out beforehand. The engine mode ischanged to recovery mode and the engine informs the main system of the engine mode. And the engine checks the LSUerror. If the error doesn t happen, the printing job will be proceeding.
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3.3.3.2 Timing Chart
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<Jam remove>
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System Overview
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3.4 S/W Descriptions
3.4.1 Overview
The software of Dove system is constructed with
1) Host Software part that the application software operated in Window and Web Environment, and
2) Firmware parts that is a Embedded software controls printing job.
3.4.2 Architecture
Host Software is made up of1. Graphic User Interface that offers the various editing functions to user in Host,
2. Driver that translates the received document to a Printing Command language which printer can understand andtransfers data to spooler,
3. Stand-alone Application that offers the various printing application, DMS(Document Management System),RCP(Remote Control Panel), Printer Status Monitor, Network Management in Window system,
4. Web-based-Application that offers the same functions as Stand-alone Application and RDC(Remote DiagnosisControl) in Web environment.
Firmware is made up of1. Application (Emulation) that is a interpreter translate data received from Host to a printing language (PCL, PS, GDI,
etc.) to be able to make the user to take same output as originally one what composed in Host.
2. Kernel that control and management the whole procedure include of Control flow and Printing Job before transfer toEngine system.
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3.4.3 Data and Control Flow
The above Block Diagram is explained that:
Host Side is made up of 1. Driver that is Windows application software translate printed data to one of printer language and create spooler file,
2. Web-based Application that offer a various printer additional functions, management of printing job, printeradministration, Status monitor to monitoring the printer status by real time in Web, independent environment on OS.
3. Stand-alone Application that is a similar Window software as same as above 2,
4. Port Monitor that manages the network communication between spooler and Network Interface Card, or variousadditional application and Network Interface Card,(this is, at first, make communication logical port, manage the data,transfer them from spooler to network port, and offer the result of printing).
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Firmware Side is made up of1. Network Interface Card is that relay the communication between Host and kernel using various network protocol,
2. Kernel is that manages the flow control of emulation procedure, receiving data from Host or Network card and printingwith engine & rendering job,
3. Emulation is that interprets the various output data from selected emulation,
4. Engine is that prints rendered bit-map data to paper with required size and type by Kernel.
And then, for Job Spooling function for Multi-User, Multi-Printing that is occurred in Network printing and various additionalprinting functions, this Kernel use max. 10 Queuing systems in a memory.
In Printing, the two procedures are(1) Case of using Parallel or USB Port
After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver translate the allgraphic data of it and send data to host spooler. And then the spooler sends the data stream to the printer viaparallel port or USB port.
Kernel receives this data from Host, and then select emulation fit to data and start selected one. After emulation jobend, Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU).
Engine print the received data to required paper with the sequential developing process.
(2) Case of using Network Interface Card
After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver translate the allgraphic data of it and send data to host spooler.
If so, Port monitor managing network port receives data from spooler and sends a data stream to the NetworkInterface Card.
Network interface card receives it and send to Kernel part,
Kernel receives this data from Host, and then select emulation fit to data and start selected one. After emulation jobend, Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU).
Engine print the received data to required paper with the sequential developing process.
The additional printing function are realized in(1) Web environment
(2) Window environment.
On addition, Kernel informs a status of printing status and printer status to user made printing job with the Status Monitor.
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-1
555. Disassembly and Reassembly5.1 General Precautions on Disassembly
When you disassemble and reassemble components, you must use extreme caution. The close proximity of cablesto moving parts makes proper routing a must. If components are removed, any cables disturbed by the procedure must be restored as close as possible to theiroriginal positions. Before removing any component from the machine, note the cable routing that will be affected.
Whenever servicing the machine, youmust perform as follows:
1. Check to verify that documents are not stored inmemory.
2. Be sure to remove the toner cartridge before youdisassemble parts.
3. Unplug the power cord.
4. Use a flat and clean surface.
5. Replace only with authorized components.
6. Do not force plastic-material components.
7. Make sure all components are in their proper posi-tion.
Releasing Plastic Latches
Many of the parts are held in place with plastic latches.The latches break easily; release them carefully. To remove such parts, press the hook end of the latchaway from the part to which it is latched.
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5.2 Front Cover
1. Take out the Cassette.
2. Open the Cover.
3. If necessary, remove the Toner Cartridge.
4. To remove the Front Cover, first pull the part belowthe both side of the Front Cover with a light pres-sure to the direction of arrow.
Cassette
Toner Cartridge
Front Cover
2
1
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5.3 MP Tray Ass'y
1. Open the MP Tray Ass'y
2. Pull the Tray Links from the both side of the FrontCover with a light pressure to the direction of arrow.
3. Apply light pressure to the both side of the MP TrayAss'y and pull it in the direction of arrow, as shownbelow.
MP Tray Ass'y
Tray Link
MP Tray Ass'y
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5.4 Rear Cover
1. Take out the Duplex Unit.
2. Remove the four screws securing the Rear Coverand then Release the Rear Cover from the Set.
3. To remove the Face Up Cover, first release theStopper Strap in the direction of arrow.
4. Unlatch the Face Up Cover from the Rear Coverand then release the Face Up Cover, as shownbelow.
Duplex Unit
Stopper Strap
1 2
Face Up Cover
Rear Cover
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5.5 Fuser Ass'y
1. Before you remove the Fuser Ass'y, you shouldremove:- Rear Cover (Refer to 5.4)
2. Remove the four screws securing the Fuser Ass'yand then pull the Fuser Ass'y.
3. Release the CON Harness and REC Harness fromthe Thermostat and then remove the three screwssecuring the Thermostat and remove it.
4. To remove the Electrodes, first release RECHarness from the left side of the Electrode andthen release the CON Harness from the right sideof the Electrode, as shown below.
5. Remove the two screws securing the both side ofthe Electrode and then release the Caps andElectrodes in the direction of arrow, as shownbelow.
Fuser Ass'y
Thermostat
CON Harness
REC Harness
REC Harness
Electrode
Cap
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6. Remove the two screws securing the IInput Guideand remove it.
7. Unplug the connector from the Input Guide andremove the one screw securing the Thermistor andremove it.
8. Remove the three screws securing the Idle GearBracket and remove it.
9. Remove the one screw securing the Fuser Coverand release the Fuser Cover from the FuserFrame.
Input Guide
Thermister
Idle Gear Bracket
Fuser Cover
Fuser Frame
10. Release the Fuser Gear and HR Bush and thenremove the Heat Roller, as shown below.
11. Remove the Jam Link Lever (L,R) and JamHolder (L,R) and then remove the Pressure Roller,as shown below.
Disassembly and Reassembly
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Heat Roller
HR Bush
HR Bush
Fuser Gear
Jam Holder
Jam Link Lever
Jam Holder
Jam Link Lever
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5.6 Top Cover
1. Before you remove the Top Cover, you shouldremove:- Rear Cover (Left, Right) (Refer to 5.4)
2. Remove the four screws securing the Top Cover,as shown below.
3. To remove the Top Cover, first lift the Top Coverwith a light pressure to the direction of arrow. Thenunplug the OPE Harness, as shown below.
Top Cover
Disassembly and Reassembly
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5.7 OPE Unit
1. To remove the OPE Unit, first lift the OPE Unit witha light pressure to the direction of arrow, Thenunplug the OPE Harness, as shown below.
Notice : When reassembly the OPE Unit, hole insideof figure insert a harness.
2. Remove the six screws securing the OPE PBA andLCD Panel to the OPE Cover and remove it, asshown below.
3. Release the Lens and Keys from the OPE Cover.
OPE Unit
LCD Panel
OPE PBA
OPE Cover
Lens
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5.8 Side Cover (Left, Right)
1. Before you remove the Side Cover (Left, Right),you should remove:- Rear Cover (Refer to 5.4)- Top Cover (Refer to 5.6)
2. Remove the one screw securing the Right SideCover, as shown below.
3. Apply light pressure to the bottom of the Right SideCover and pull it to the right side in the direction ofarrows, as shown below.
4. Remove the one screw securing the Left SideCover, as shown below.
5. Apply light pressure to the bottom of the Left SideCover and pull it to the left side in the direction ofarrows, as shown below.
Right Side Cover
Left Side Cover
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6. If necessary, pull the DIMM Cover in the directionof arrow and remove it, as shown below.
Notice : Be careful not to damage the hooks whenremove the Side Cover (Left, Right).
DIMM Cover
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5.9 Shield Controller Ass'y
1. Before you remove the Shield Controller Ass'y, youshould remove:- Side Cover Left (Refer to 5.8)
2. Unplug the all connectors from the Main PBA.
3. Remove the three screws securing the ShieldController Ass'y and remove it.
4. Remove the five screws securing the Main PBA tothe Shield and remove it.
5. The connectors are located, as shown below.
Shield Controller Ass'y
Shield
Insulator Sheet
Main PBA
LCD OPE
Cartridge
USB
Line
Duplex
Engine
BLDC
Pick Up
REGI
LSU S/W
LSU
Thermistor
MPF_SEN
MPF
LED OPE
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-13
5.10 Drive Ass'y
1. Before you remove the Drive Ass'y, you shouldremove:- Side Cover Left (Refer to 5.8)
2. Remove the six screws securing the Drive Ass'yand remove it.
Notice : The six screws have numbers stamped intothe Drive Ass'y base plate. When refitting theDrive Ass'y tighten the screws the order theyare numbered. Only screws numbered 1 to 5are fitted at this stage. Screw 6 is fitted whenthe Shield Controller Ass'y is refitted.
3. If necessary, remove the four screws securing theBVDC Motor Ass'y and remove it.
Drive Ass’y
Gear Bracket Ass’y
BVDC Motor Ass’yHarness
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Disassembly and Reassembly
5-14
5.11 Duplex Drive Ass'y
1. Before you remove the Duplex Drive Ass'y, youshould remove:- Side Cover Right (Refer to 5.8)
2. Unplug the connector from the Connection PCBand remove the three screws securing the DuplexDrive Unit and remove it.
3. If necessary, remove the two screws securing theDuplex Motor and remove it.
Duplex Drive Ass'y
ConnectionPCB
Duplex Motor
Harness
Duplex Motor
Bracket Ass’y
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-15
5.12 Shield SMPS Ass'y
1. Before you remove the Shield SMPS Ass'y, youshould remove:- Side Cover Right (Refer to 5.8)- Duplex Drive Ass'y (Refer to 5.11)
2. Unplug the two connectors (HVPS, Fuser).
3. Remove the three screws securing the ShieldSMPS Ass'y and remove it.
4. Unplug the connector (AC Inlet) and remove thefour screws securing SMPS and remove it.
HVPS Connector
Fuser Connector
Shield SMPS Ass'y
SMPS
Insulator Sheet
Shield SMPS (With AC Inlet)
AC Inlet Connector
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Disassembly and Reassembly
5-16
5.13 Connection PCB
1. Before you remove the Connection PCB, youshould remove:- Side Cover Right (Refer to 5.8)
2. Unplug the all connectors.
3. Remove the two screws securing the ConnectionPCB and remove it.
4. The connectors are located, as shown below.
ConnectionPCB
ConnectionPCB
FAN Duplex Exit Motor
Fan Main
HVPS
Duplex Motor
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-17
5.14 Fuser Drive Ass'y
1. Before you remove the Fuser Drive Ass'y, youshould remove:- Side Cover Right (Refer to 5.8)
2. Unplug the connector from the Connection PCB.
3. Remove the three screws securing the Fuser DriveAss'y and remove it.
4. If necnsary, remove the two screws securing theStep Motor and remove it.
Fuser Drive
ConnectionPCB
Fuser Drive Ass’y
Step Motor
Harness
Fuser Exit Bracket Ass'y
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Disassembly and Reassembly
5-18
5.15 Fan
1. Before you remove the Fan, you should remove:- Side Cover Right (Refer to 5.8)
2. Unplug the two connectors from the ConnectionPCB, as shown below.
3. Remove the two screws securing the Fans andthen pull the Fans (Main, Duplex).
Main Fan
Duplex Fan
ConnectionPCB
Duplex Fan
Main Fan
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-19
5.16 Pick Up Roller Ass'y
1. Take out the Cassette.
2. To remove the Pick Up Roller Ass'y, first lift thenotch attached to the Pick Up Roller Ass'y from theShaft, then slide the Pick Up Roller Ass'y from leftto right and it will be released completely, as shownbelow.
3. To remove the Shaft, first release the locker andslide the Shaft from left to right, then lift the notchattached to the Cam so that it's released from theShaft. Then release the Bush from the Shaft andremove the Shaft from the Duplex Guide Housing,as shown below.
Pick Up Roller Ass'y
1
2
2
1
Cam
Bush
Shaft
Locker
3
4
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Disassembly and Reassembly
5-20
5.17 Duplex Guide Housing (With Feed Roller)
1. Before you remove the Duplex Guide Housing, youshould remove:- Pick Up Roller Ass'y (Refer to 5.16)
2. Remove the two screws securing the Duplex GuideHousing.
3. Unplug the one connector (Photo Interrupter) andremove the Duplex Guide Housing (with FeedRoller), as shown below.
4. Pull the Feed Roller from the Bushing.
Duplex Guide Housing
Photo InterrupterConnector
Duplex Guide Housing
BushingFeed Roller
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-21
5.18 HVPS Housing
1. Before you remove the HVPS Housing, you shouldremove:- Pick Up Roller Ass'y (Refer to 5.16)- Duplex Guide Housing (Refer to 5.17)
2. Remove the eight screws securing the HVPSHousing, as shown below.
3. Unplug the all connectors and remove the HVPSHousing, as shown below.
4. If necessary, remove the three screws securing theHVPS and remove it.
HVPS Housing
Duplex MotorConnection PBA& SMPS
Engine
Duplex GuideHousing
HVPS
Insulator Sheet
Shield
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Disassembly and Reassembly
5-22
5.19 Cover Mid Front
1. Before you remove the Cover Mid Front, youshould remove:- Top Cover (Refer to 5.6)- Side Cover (Refer to 5.8)
2. Remove the six screws securing the Cover MidFront and release two hooks in the center.This cover is fragile take care when removing it.
Cover Mid Front
Hook
Hook
5.20 MPF Housing
1. Before you remove the MPF Housing, you shouldremove:- Cover Mid Front (Refer to 5.19)
2. Remove the four screws securing the MPFHousing and remove it.
3. To remove the MP Pick Up Ass'y, first lift the notchattached to the left side Stopper so that it's slide theright to left from the Shaft, then left side Idle slid theright to left from the Shaft and take out the MP PickUp Ass'y, as shown below.
MPF Housing
Stopper
1
2
Idle
MP Pick Up Ass'y
MPF Housing
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-23
5.21 Feed Roller Parts
1. Before you remove the Feed Roller Parts, youshould remove:- Pick Up Roller Ass'y (Refer to 5.16)- Duplex Guide Housing (Refer to 5.17)- Middle Cover Ass'y (Refer to 5.19)- MPF Housing (Refer to 5.20)
2. Remove the two screws securing the both side ofthe Guide Paper and then remove the Guides.
3. Pull up the Feed Idle Shaft and the Bushs (withSpring).
4. Release the E-Ring securing the Feed2 Gear andremove it.
5. Remove the three screws securing the FeedBracket Unit and then remove the Feed BracketUnit and Feed2 Shaft.
Guide Paper
Feed Idle Shaft
Bush
Srring
Feed2 Gear
E-Ring
Feed2 Shaft
Feed Bracket Unit
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Disassembly and Reassembly
5-24
6. If necessary, release the three E-Rings securingthe Gears (T2 Idle, Retard, Idle) and then removethe Gears from the Feed Bracket, as shown below.
Notice : Be aware of the E-Rings to ensure they arenot lost.
7. Remove the Clutch Unit, as shown below.
8. Pull up the Feed1 Roller from the Bushing, asshown below.
T2 Idle Gear
Retard Gear
Idle Gear
E-Ring
Bracket
Feed Shaft
Feed1 Gear Ass'y
Clutch Unit
Feed1 Roller
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-25
5.22 Pick Up Gear Ass'y & Solenoids
1. Before you remove the Pick Up Gear Ass'y &Solenoids, you should remove:- Duplex Guide Housing (Refer to 5.17)- Feed Bracket Unit (Refer to 5.21.5)
2. Release the Pick Up Gear Ass'y and Pick Up GearShaft, as shown below.
3. Remove the two screws securing the ManualSolenoid and Feed Solenoid and then remove theSolenoids, as shown below.
Pick Up Gear Ass’y
Pick Up Gear Shaft
Feed Solenoid
Manual Solenoid
5.23 Exit Roller
1. Before you remove the Exit Roller, you shouldremove:- Top Cover (Refer to 5.6)- Side Cover (Refer to 5.8)- Fuser Drive Ass'y (Refer to 5.14)
2. Remove the Exit Gear, and release the Bearing atone end then remove the Roller Exit F/Down andExit Roller Rack, as shown below.
1
2
1
Exit Gear
Roller Exit F/DownExit Roller Rack
Bearing
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Disassembly and Reassembly
5-26
5.24 LSU
1. Before you remove the LSU, you should remove:- Top Cover (Refer to 5.6)- Side Cover (Refer to 5.8)
2. Remove the four screws securing the LSU andremove it.
LSU
5.25 TERMINAL
1. Before you remove the CRUM2 PBA, you shouldremove:- Top Cover (Refer to 5.6)- Side Cover (Refer to 5.8)- LSU (Refer to 5.24)
2. Remove the one screw securing the CRUM2 PBAand remove it and then release the four Terminals,as shown below.
Notice : Be aware of the Terminals to ensure they arenot lost.
CRUM2 PBA
Terminal
Disassembly and Reassembly
Samsung ElectronicsService Manual 5-27
5.26 Transfer Roller and PTL Holder
1. Before you remove the Transfer Roller Parts, youshould remove:- Top Cover (Refer to 5.6)- Side Cover (Refer to 5.8)- LSU (Refer to 5.24)
2. To remove the Transfer Roller, first pull the TRHolder and then take out the Transfer Roller, asshown below.
Notice : Do not grab the rubber part of the TransferRoller, it may cause a malfunction due to aforeigen object. Hole the both side of theTransfer Roller when replacing it.
3. Remove the three screws securing the TransferEarth and remove it.
4. Release the PTL Holder, as shown below.
TR Holder
2
1
Transfer Roller
PTL Holder
Transfer Earth
Alignment and Adjustments
Samsung ElectronicsService Manual 4-1
444. Alignment and Adjustments
4.1 Sample Pattern
This product has the several sample patterns for maintenance. With the sample patterns, check the existence of the abnormality. The patterns help to regularly maintain the product.
4.1.1 Printing a Demo Page
Print a demo page or a configuration sheet to make sure that the printer is operating correctly.Press the Menu button to selection (In formation -> Demo Page)
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Alignment and Adjustments
4-2
4.2 Control Panel
4.2.1 Control Panel
ML-3050
1 Toner Save: Allows you to save on toner by using less toner in printing.
2 Demo: Allows you to print a demo page.
3 Stop: Stops an operation at any time.
4 Status: Shows the status of your printer.
ML-3051N and ML-3051ND
1 Menu: Enters Menu mode and scrolls through the available menus.
2 Scroll buttons: Scroll through the options available in the selected menu, and increase or decrease values.
3 OK: Confirms the selection on the display.
4 Back: Sends you back to the upper menu level.
5 Toner Save: Allows you to save on toner by using less toner in printing.
6ML-3051N_Demo: Allows you to print a demo page.
ML-3051ND_Duplex: Allows you to print documents on both sides of the paper.
7 Stop: Stops an operation at any time.
8 Status: Shows the status of your printer.
Alignment and Adjustments
Samsung ElectronicsService Manual 4-3
4.2.2 System setup
This chapter provides step by step information on setting up your printer.This chapter includes:• Using control panel menus (ML-3051N, ML-3051ND only)• Menu overview• Printing a demo page• Changing the display language (ML-3051N, ML-3051ND only)• Using toner save mode
Using control panel menus (ML-3051N, ML-3051ND only)
A number of menus are available to make it easy for you to change the printer settings. The diagram on the next columnshows the menus and all of the menu items available in each menu.
Accessing control panel menusYou can control your printer from the printer’s control panel. You can also set the control panel menus while the printer isin use.1. Press Menu until the menu you want appears on the bottom line of the display and press OK.2. Press the Scroll buttons until the desired menu item appears and press OK.3. If the menu item has sub menus, repeat step 2.4. Press the Scroll buttons to access the desired setting option or the required value.5. Press OK to save your selection.
An asterisk (*) appears next to the selection on the display, indicating that it is now the default.6. Press Stop to return to Standby mode.
After 60 seconds of inactivity (no key being pressed), the printer automatically returns to Standby mode.
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Alignment and Adjustments
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4.2.3 Menu overview
The control panel menus are used to configure the printer. The control panel provides access to the following menus:
a. Available with the ML-3051ND.b. Available with optional wireless network interface.
Information
Menu MapConfiguratonDemo PagePCL Font ListPS3 Font ListEPSON Font
Off Power Off / Sleep Mode (When data receive it’ll Wake-up)
Green On Ready status
Blink Blink Slowly : Data Comm. status
Blink Fast : Printing status
Red On Error which needs user action
(Toner Empty, Paper Jam, Paper Empty, Cover Open etc..)
Blink Recoverable Error
(Paper Mismatching, Manual printing in MP Tray)
Warning status
Warning just like supplies exchange (Toner Low etc.)
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4-6
Error Type Legacy models Error Platform model Error
Recoverable Error Error which can be recoverable Error which doesn°Øt need any special user Ex) Jam, Paper Empty, etc. actions
Ex) Paper Mismatching, Manual printing inMP Tray
Error Just like hardware error which can not be Including provider service error which need fixed even if user does special action some special user or provider actionsEx) Hsync Error, LSU Error, etc. Ex) Toner Empty, Paper Jam, Paper Empty,
Cover Open, etc.
Assert behavior LED model LED model- It shows the lines by LED combination - Not supportLCD model LCD model- It shows the task name and the lines in - It shows the task name and the lines in LCD LCD display display
To avoid print quality and paper feed problems resulting from worn parts and to maintain your printer in top workingcondition the following items will need to be replaced at the specified number of pages or when the life span of eachitem has expired.
4.4 LED Status Error Message
4.4.1 Status LED
Status Description
Off • The printer is off-line and cannot print.
• The printer is in power save mode. When data is received, it switches to on-line
automatically.
Green On The printer is on-line and can receive data from the computer.
Blinking • When the backlight blinks slowly, the printer is receiving data from the computer.
• When the backlight blinks quickly, the printer is receiving and printing data.
Red On • The toner cartridge is totally exhausted.
Remove the old toner cartridge and install a new one.
• A paper jam has occurred. To solve the problem.
• The front cover is open. Close the front cover.
• There is no paper in the tray. Load paper in the tray.
• The printer has stopped printing due to a major error. Check the display message.
for details on the meaning of the error message.
Blinking • A minor error is occurring and the printer is waiting for the error to be cleared. Check
the display message. When the problem is cleared, the printer resumes printing.
• The toner cartridge is low. Order a new toner cartridge. You can temporarily improve
print quality by redistributing the toner.
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4.4.1 Error Message
Message Meaning Suggested solutions
Door Open The front cover or rear cover is not Close the cover until it locks into place.securely latched.
Duplex Jam 0 Paper has jammed during duplex Clear the jam.Check Inside printing.
Duplex Jam 1 Paper has jammed during duplex Clear the jam. Open/Close Door printing.
Fuser Door Open The fuser door is not securely latched. Open the rear cover and close the fuser door untilit locks into place.For the location of the fuser door.
Install Toner A toner cartridge is not installed. Install a toner cartridge.
Invalid Toner The toner cartridge you have installed is Install a Samsung-genuine toner cartridge, not for your printer. designed for your printer.
Load Manual Press The multi-purpose tray is empty in Load a sheet of print material and press StopStop Key manual feed mode. (if you use the ML-3050) or OK (if you use the
ML- 3051N or ML- 3051ND). You need to pressStop or OK each page to be printed.
Low Heat Error There is a problem in the fuser unit. Replace to Fuser Unit.Cycle Power
LSU Hsync Error A problem has occurred in the LSU Replace to LSU Unit.Cycle Power (Laser Scanning Unit).
LSU Motor Error A problem has occurred in the LSU Replace to LSU Unit.Cycle Power (Laser Scanning Unit).
Main Motor Locked There is a problem in the main motor. Open and then close the front cover.
Open Heat Error There is a problem in the fuser unit. Unplug the power cord and plug it back in.Cycle Power If the problem persists, please call for service.
Over Heat Error There is a problem in the fuser unit. Unplug the power cord and plug it back in. Cycle Power If the problem persists, please call for service.
Paper Jam 0 Paper has jammed in the feeding area Clear the jam. Open/Close Door of the tray.
Paper Jam 1 Paper has jammed in the fuser area. Clear the jam. Open/Close Door
Paper Jam 2 Paper has jammed in the paper exit Clear the jam. Check Inside area.
Printing... The printer is printing jobs using Complete your printing.the displayed language.
Ready The printer is on-line and ready to Use your printer.printer.
Replace Toner This message appears between the Replace the toner cartridge with a new one.Toner Empty and Toner Low status.
Self Diagnostic... The engine in your printer is checking Please wait a few minutes.some problems detected.
Alignment and Adjustments
Samsung ElectronicsService Manual 4-9
Message Meaning Suggested solutions
Sleeping... The printer is on power save mode. When data is received, it switches to on-lineautomatically.
Toner Empty The toner cartridge has run out. Replace the toner cartridge with a new one. The printer stops printing.
Toner Low The toner cartridge is almost empty. Take out the toner cartridge and thoroughlyshake it. By doing this, you can temporarilyreestablish printing operations.
Tray 1 Paper Empty There is no paper in the tray 1. Load paper in the tray 1.
Tray 2 Paper Empty There is no paper in the optional tray 2. Load paper in the optional tray 2.
Samsung ElectronicsService Manual
Alignment and Adjustments
4-10
1234
OPC Drum
Charge Roller
Supply Roller
Developing Roller
567
Transfer Roller
Heat Roller
Pressure Roller
1
2
3 4
5
6
7
4.5 Abnormal Image Printing and Defective Roller
If abnormal image prints periodically, check the parts shown below.
No Roller Abnormal image period Kind of abnormal image
1 OPC Drum 75.5mm White spot, Block spot
2 Charge Roller 37.7mm Black spot
3 Supply Roller 44.9mm Horizontal density band
4 Develop Roller 35.2mm Horizontal density band
5 Transfer Roller 47.1mm Black side contamination/transfer fault
6 Heat Roller 77.8mm Black spot and fuser ghost
7 Pressure Roller 75.4mm Black side contamination
Alignment and Adjustments
Samsung ElectronicsService Manual 4-11
4.6 How to use DCU
4.6.1 DCU Setup
You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave theconnect the harness wire(10 pin/4 pin) to the CN1(ML-3050) of the Main control board.
ML SERIES DIAGNOSTIC CONTROL UNIT04
05
07
08
09
10
DEV 300
LSU READY
PAPER EMPTY
COVER OPEN
COER HEATING
DEV 350
LSU MT & LD
PAPER WIDTH
EXIT SENSOR
PRINTING TEMP
DEV 350
LSU MOTOR
NEW CRU
FEED SENSOR
READY HEAT
ON OFF
STATUS
SELF
TEST
DIAGNOSTIC
DIAGNOSTIC CODE000102030405060708091011
12
13
14
61
0001020304
20304050
69
606268647071727395
MAIN MOTOR OPERATING SYSTEMMAIN HIGH-VOLTAGE ONTRNSFER HIGH-VOLTAGE (-)ONTHV(+) REFERANCE VOLTAGEDEV/SUPPLY HIGH-VOLTAGE ON/PTL ONLSU OPERATING SYSTEMPICKUP CLUTCH ONPEEMPTY/PWITH/NEW CRU TESTFEED & EXIT SENSOR TESTCOVER OPEN SENSOR TESTFUSER TESTHOT BURN TEST
20, 21, 22 Print Start The engine controller received the print order from the video controller.
20: 1st, 21: MP, 22: SCF
30 Feed Sensor On The paper is passing out of the Feed Sensor.
40 Feed Sensor off The paper has passed out of the Feed Sensor.
50 Paper Out The paper has passed out of Exit Sensor.
69 Sleep Mode The fuser power turned off to minimize the power consumption.
Code State Description
60, 62, 68 Fuser Error The error in the fuser occurred. There is a short circuit in the thermistorand the thermostat while printing, Low Temperature Error occurs.
• 60: Open Fuser Error
• 62: Low Heat Error
• 68: Over Heat Error
64 Cover Open The Printer Cover is open.
65 CRU Error The Toner Cartridge not installed,
70 No Paper No paper in the paper cassette.
71 Paper Jam 0 The front part of paper is jammed between pickup unit and Feed sensor.
72 Paper Jam 1 The front part of paper is jammed between the Discharge sensor and Feed
sensor.
73 Paper Jam 2 The front part of paper is jammed just after passing through the discharge
sensor.
76 Out Bin Full The Out bin is filled with paper.
95 LSU Not Ready LSU Scanner Motor not ready or Hsync signal not output.
Alignment and Adjustments
Samsung ElectronicsService Manual 4-13
4.6.3 Self Diagnostic Mode
If Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem.
The printer works only in the self-test mode to solve the malfunction problem. To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same time.Release the button within 2 or 3 seconds if 78 shows in the DCU. If 00 shows in the DCU, press the button [Up] or[Shift] to select the self+test , and press the button of [Enter] to operate. To stop, press the button of [shift] and[Enter] together.
Code Description
00 Main Motor Operating System
Only the main motor is in operation.
01 Main High Voltage On(THV-)
-1400 voltage output by MHV terminal.
Caution : High voltage probe should be used.
02 Transfer High Voltage(-)On(THV-)
-1000 voltage output by MHV terminal.
Caution : High voltage probe should be used.
03 Transfer High Voltage (+)Reference on (THV +)
+1300 voltage output by MHV terminal.
Caution : High voltage probe should be used.
04 DEV/supply High Voltage : DEV/Supply High Voltage Test.
The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply
high voltage output by each HV terminal. Press the [Up] button to switch the voltage. The
middle and right one of the three LEDs are on and -350 voltage output by DEV HV
terminal.
Caution : High voltage probe should be used.
05 LSU Operating System
The scanning motor of LSU is in operation, the right LED of the three buttons on. Press
the [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is
normal, all LEDs are on.
06 Pickup clutch on
The Solenoid in the printer is in operation. To stop the operation, Press the button [shift]
and [Enter] together.
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Alignment and Adjustments
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Code Description
07 Paper Empty Sensor Test : If activate the Actuator of the PEMPTY Sensor, the left and right of the three LEDs areon.Paper Empty Sensor ON/OFF 1st LED ON/OFF
08 Feed & Exit Sensor Test Test the Feed sensor and Discharge sensor in the same way as '07'.Feed Sensor ON/OFF 2nd LED ON/OFFExit Sensor ON/OFF 3rd LED ON/OFF
09 Cover Open Sensor TestTest the Cover Open Sensor in th same way as code '07’Cover Open Sensor ON/OFF1st LED ON/OFF
10 Fuser TestIf the [Enter] button pressed, the right LED is on and temperature of the fuser is up toREADY Mode. If the [Up] button pressed, the middle LED is on and temperature of thefuser is up to Printing Mode. If you press the button once more, the left LED is on and temperature of the fuser is up tooverheat Mode.
11 Hot Burn TestIf the [enter] button pressed, the printer is continuously printing without detection. Turn the power off to stop operation.
12 Cleaning Mode Print ModePrint the paper to clean the OPC Drum in the Cartridge.
13 THV(+) TRIGGER. ALL HV :All high voltage output by each HV terminal and LSU and the fan is in operation. In thismode, electronic resistance of transfer roller and high voltage is detected.
14 PTL Test : (ML-1610 : not design)Indicates the function of the PTL, same method of the code ‘07’.
15 Fan Test :Indicates the function of the Fan, same method of the code ‘07’.
16 Manual Pickup Test : Indicates the function of th Manual Pickup, same method of the code ‘07’.
17 Manual Sensor Test : Indicates the function of the Manual Sensor, same method of the code ‘07’.
Alignment and Adjustments
Samsung ElectronicsService Manual 4-15
No. Enter Up/Down Stop Remark
00 Motor Motor Run Motor Stop
01 MHV Mhv On Mhv Off -
-1000V
-350V
020mV
1300V
02 THV(-) Thv Negative On Thv Negative Off
03 THV(+) Thv On Thv Off +1300V
04 DEV Dev OnSupply DEV
Dev Off0 : -550V 0 : -350V
05 LSU LSU RunOn Off Ready
LSU Stop
06 PickUp Pickup On Pickup Off
07 PEmptyPaper Empty
08 SensorExit Feed
09 CoverCover Open
10 Fuser Fuser On Fuser Off
11 Hot Burn Hot Burn On
12 Clean Print Clean Printing
13Thv
Reference low adequate high
14 PTL PTL On PTL Off PTL No
15 FAN Fan On Fan Off
16PickUp
Manual Pickup On Manual Pickup Off
17Manual
Manual
Sensor Manual Sensor
Function
4.6.4 Self Test Button
If the Self-Test button pressed, vertical lines are printed.
Turn the power on while pressing this button, '89' shows in the DCU and the printer is warming up. After warming-up the printer is in READY Mode, and '88' shows in the DCU. In this mode, without any detection, the printer beginsprinting(trial printing and data from the PC). It is convenient to use this mode when the engine malfunction isdetected in the control board.
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Alignment and Adjustments
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4.7. Paper Jam
4.7.1 Clearing paper jams
In the tray 11. Pull the tray 1 open.
2. Remove the jammed paper by gently pulling itstraight out. Make sure that all of the paper isproperly aligned in the tray 1.
If the paper does not move when you pull, or if youdo not see the paper in this area, check the fuserarea around the toner cartridge.
3. Insert the tray 1 into the printer until it snaps intoplace. Printing automatically resumes.
4.7.2 In the paper feed area
Message Location of Jam
Paper Jam 0 In the paper feed area
Open/Close Door (tray 1, optional tray 2, multi-purpose tray)
Paper Jam 1 Around the toner cartridge
Open/Close Door Check Inside In the paper exit area
Paper Jam 2
Duplex Jam 0 In the duplex area
Check Inside a
Duplex Jam 1 Between the duplex unit and fuser area
Open/Close Doora
a. ML-3051ND only
Alignment and Adjustments
Samsung ElectronicsService Manual 4-17
In the optional tray 21. Pull the optional tray 2 open.
2. Remove the jammed paper from the printer.
If the paper does not move when you pull, or if youdo not see the paper in this area, stop and go tostep 3.
3. Pull the tray 1 half.
4. Pull the paper straight up and out.
5. Insert the trays back into the printer. Printingautomatically resumes.
In the multi-purpose tray
1. If the paper is not feeding properly, pull the paperout of the printer.
2. Open and close the front cover to resume printing.
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Alignment and Adjustments
4-18
1. Open the front cover and pull the toner cartridgeout.
2. Remove the jammed paper by gently pulling itstraight out.
3. Replace the toner cartridge and close the frontcover. Printing automatically resumes.
4.7.3 Around the toner cartridge
1. Open and close the front cover. The jammed paperis automatically ejected from the printer.
2. Gently pull the paper out of the output tray.
If you do not see the jammed paper or if there isany resistance when you pull, stop and go to thenext step.
3. Open the rear cover.
4. If you see the jammed paper, push the pressurelever on each side up and remove the paper.Return the pressure lever to its original position andskip the step 10.
If you still do not see the paper, go to the next step.
4.7.4 In the paper exit area
1 pressure lever
Alignment and Adjustments
Samsung ElectronicsService Manual 4-19
5. Release the blue strap, the rear cover stopper, andfully open the rear cover, as shown.
6. Unfold the duplex guide fully.
7. While pushing the fuser lever to the right, open thefuser door.
8. Pull the jammed paper out. If the jammed paper does not move when you pull,push the pressure lever on each side up to loosethe paper, and then remove it.
9. Return the lever, door, stopper, and guide to theiroriginal position.
10. Close the rear cover. Printing automaticallyresumes.
1 rear cover stopper
2 rear cover2
1
1 duplex guide
1
1 fuser lever
2 fuser door21
1 pressure lever
1
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Alignment and Adjustments
4-20
Duplex jam 01. Pull the duplex unit out of the printer.
2. Remove the jammed paper from the duplex unit.
If the paper does not come out with the duplex unit,remove the paper from the bottom of the printer.
Duplex jam 11. Open the rear cover.
2 Unfold the duplex guide fully.
3. Pull the jammed paper out.
1 duplex unit
1
4.7.5 In the duplex unit area (ML-3051ND only)
If the duplex unit is not inserted correctly, paper jam may occur. Make sure that the duplex unit is inserted correctly.
1
1 duplex guide
Alignment and Adjustments
Samsung ElectronicsService Manual 4-21
4.7.6 TiPs for avoiding paper jams
By selecting the correct media types, most paper jams can be avoided.• Follow the procedures on page 5.5. Ensure that the adjustable guides are positioned correctly.• Do not overload the tray. Ensure that the paper level is below the paper capacity mark on the inside wall of the
tray.• Do not remove paper from the tray while your printer is printing.• Flex, fan, and straighten paper before loading.• Do not use creased, damp, or highly curled paper.• Do not mix paper types in a tray.• Use only recommended print media. • Ensure that the recommended print side of print media is facing down in the tray, or facing up in the multi-purpose
tray.• If paper jams occur frequently when you print on A5-sized paper: Load the paper into the tray with the long edge
facing the front of the tray.
In the printer properties window, set the page orientation to be rotated 90 degrees.
Samsung ElectronicsService Manual
Alignment and Adjustments
4-22
4.8 Download & Reset F/W
1. In LCD "Update Image Please Wait..." message will be show up.
2. Status LED Slow blink→ Fast bli nk then print out configuration page
3. Check th e OS version and total pa ge value is "0"
4. Please set power On/ Off
LED Panel
Reset method
1. In Dos Prompt types "Usblist2 [ Rom file name] " and Press Enter
2. In LCD "Flash Upgrade..." message will be show up.3. In LCD "Update Image Please Wait..." message will be
show up.4. When download complete, set will be automatically power
On/Off and it’ ll Warming Up
LCD Panel
1. While Pressing Stop key, Power O n the Printer2. In Dos Prompt types "Usblist2 [ Rom file name] " and Press
Enter3. Status LED ¡ Slow bli nk4. Status LED & Ton er Save LED are both blink5. When download complete, set will be automatically power
On/Off and it’ ll Warming Up
LED Panel
Boot Download method
1. In LCD "Update Image Please Wait..." message will be show up.
2. In LCD message Ready→ Printing then print out configuration page
3. Check th e OS version and total pa ge value is "0"
4. Please set power On/ Off
LCD Panel
1. While Pressing Stop key, Power O n the Printer2. After verify the m essage "Download Mode Press Stop key"
Press Stop Key3. Verify the m essage "Download Mode Plese Send IMG..."4. In Dos Prompt types "Usblist2 [ Rom file name] " and Press
Enter5. In LCD "Update Image Please Wait..." message will be
show up.6. When download complete, set will be automatically power
On/Off and it’ ll Warming Up
LCD Panel
1. In Dos Prompt types "Usblist2 [ Rom file name] " and Press Enter
2. Status LED Slow blink3. Status LED & Ton er Save LED are both blink4. When download complete, set will be automatically power
On/Off and it’ ll Warming Up
LED Panel
Normal Download method
Firmware download method
Reference Information
Samsung ElectronicsService Manual 12-1
121212. Series model solution(ML-4050 and SCX-5530F)
12.1 Double Feed Error
End
End
Occ
ured
the
doub
le fe
ed
Is th
ere
the
regu
lar p
ositi
on to
the
hold
erpa
d in
the
tray
?
Adj
ust t
he h
olde
r pad
to th
e re
gula
r pos
ition
Re-
prin
ting
OK
/NG
?R
epla
ce th
e pa
per t
ray
assy
Rep
lace
the
SET
Is th
ere
any
prob
lem
in th
e ro
ller-
pick
up?
Rep
lace
the
rolle
r pic
k up
ass
y.
YES
NO
OK
NG
YES
OK
NG
Service Manual
Reference Information
12-2Samsung Electronics
12.2 Jam0
En
En
En
En
Reference Information
Samsung ElectronicsService Manual 12-3
12.3 Jam1
End
End
End
End
Service Manual
Reference Information
12-4Samsung Electronics
12.4 No Paper/Add Paper" error on the printer and have beenunable to clear it, even when they have verified there is paperin the printer
Reference Information
Samsung ElectronicsService Manual 12-5
12.5 Open Cover Error
Service Manual
Reference Information
12-6Samsung Electronics
12.6 Low Tonerso
lid O
RA
NG
E L
ed :
The
solid
Ora
nge
Erro
r LED
is o
n, w
hich
mea
ns to
ner l
ow s
tatu
s.
No
Pull
out T
oner
Car
trid
ge fr
om th
e SE
T an
d Sh
ake
the
Tone
r2
or 3
tim
es, R
eins
tall
Tone
r to
the
SET
Try
to d
o pr
int j
ob fo
r che
ckin
g
Tone
r sho
uld
be s
hort
age,
Rep
lace
New
Ton
er
Is th
e pa
ge p
rinte
dcl
early
?
Reference Information
Samsung ElectronicsService Manual 12-7
12.7 Over Heat Error
YE
SN
O
NO
YE
S
YE
S
Che
ck h
ow th
e LE
D is
dip
laye
d
OVE
R H
EAT
ERR
OR
Turn
off
the
prin
ter a
nd s
tay
for 5
min
ute.
Is th
e sa
me
LED
mes
sage
show
n ag
ain?
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
Try
to d
o pr
int
job
Is th
e sa
me
LED
mes
sage
sho
wn
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
OK
Turn
on
the
prin
ter.
Service Manual
Reference Information
12-8Samsung Electronics
12.8 Low Heat Error
NO
YE
SN
o
YE
S
Che
ck h
ow th
e LE
D is
dip
laye
d
LOW
HEA
T ER
RO
R
Try
to re
boot
Is th
e sa
me
LED
mes
sage
sho
wn
agai
n?
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
Try
to d
o pr
int
job
Is th
e sa
me
LED
mes
sage
sho
wn
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
OK
Reference Information
Samsung ElectronicsService Manual 12-9
12.9 Fuser Door Open
NO
YE
SN
o
YE
S
Che
ck h
ow th
e LE
D is
dip
laye
d
Fuse
r Doo
r Ope
n
Ope
n th
e re
ar c
over
and
fus
er d
oor.
Clo
se th
e fu
ser d
oor a
nd re
ar c
over
.
Is th
e sa
me
LED
mes
sage
show
n ag
ain?
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
Try
to d
o pr
int j
obIs
the
sam
e LE
D m
essa
gesh
own
agai
n?
Turn
off
the
Prin
ter.
Rep
lace
Fus
er
OK
Service Manual
Reference Information
Samsung Electronics
12.10 aA noise troubleshooting tree
En En
EnEn
EnEn
Reference Information
Samsung ElectronicsService Manual
12.11 LSU Error
: The ERROR and Online LED are blinking together
YES
No
YES
No
Check how the LED is diplayed
LSU Error on the pannel?
Try to reboot the printer
Is the same errormessage on the pannel?
Turn off the Printer.Replace LSU
Try to do print job Is the same errormessage on the pannel ?
Turn off the Printer.Replace LSU
Service Manual
Reference Information
Samsung Electronics
12.12 Scan Lock Error
No
YE
S
No
Yes
No
Yes,
Stil
l the
re is
unl
ock
erro
r mes
sage
on
the
pann
el
Yes
Che
ck if
the
switc
h is
pul
led
out
com
plet
edly
to th
e un
lock
mar
k in
side
plat
en g
lass
Are
you
sur
e th
atsw
ich
is p
ulle
d ou
tco
mpl
eted
ly?
Che
ck t
to p
ush
the
canc
el b
utto
n
Rep
lace
Sca
nnin
g U
nit A
ssy
Still
is th
ere
unlo
cker
ror m
essa
ge o
nth
e pa
nnel
?Fi
x th
e pr
oble
m
Push
[can
cel]
butto
n
Pull
out t
he s
witc
h w
ithIc
e gr
een
colo
r
Reference Information
Samsung ElectronicsService Manual
12.13 Nothing Displayed on LCD
Yes
Yes
No
NG
OK
NG
OK
Che
ck if
the
LCD
was
n't
disp
laye
d
Che
ck if
the
OPE
'sco
nnec
tion
cabl
e w
asco
nnec
ted
wel
l with
Mai
n-B
oard
l
Afte
r con
nect
edw
ell,
Try
tore
boot
the
prin
terC
opyi
ng
En d
Rep
lace
OPE
Uni
t Ass
y
Try
to re
boot
the
prin
ter
En d
Rep
lace
Mai
n-B
oard
Try
to re
boot
the
prin
ter
En d
Service Manual
Reference Information
Samsung Electronics
12.14 All black printing
YE
S
No
Yes
No
All
blac
k pr
intin
g w
hile
prin
ting
Che
ck if
OPC
Dru
m h
ave
all b
lack
tone
rs o
n th
ew
hole
sur
face
afte
rw
arm
ing
up?
Rep
lace
the
Fram
e as
s'y
Is th
ere
still
rem
aing
the
prob
lem
?
Rep
lace
the
HVP
S
Rep
lace
Ton
er C
artr
idge
End
Reference Information
Samsung ElectronicsService Manual
12.15 Blank CopyYe
s
No
`
NG
No
OK
Yes
NG
Yes
No
OK
NG
OK
Che
ck w
heth
erth
ere
is d
ocum
ent
to c
opy
Afte
r put
the
docu
men
t, C
opyi
ng.
Che
ck if
the
docu
men
t was
whi
te p
aper
En d
Afte
r put
oth
erdo
cum
ent,
Cop
ying
.
En d
Che
ck if
the
CC
D's
flat
cab
lew
as c
onne
cted
wel
l
Cop
ying
.
En d
Cop
ying
.
En d
Rep
lace
Sca
nnin
g U
nit A
ssy
Cop
ying
.
En d
Che
ck if
the
CC
D's
Lam
pop
erat
ed w
ell
Rep
lace
CC
D
Service Manual
Reference Information
Samsung Electronics
12.16 Images at 1 Copy
Yes
No
Rep
lace
Sca
nnin
g U
nit A
ssy
Che
ck th
e C
CD
'sfla
t cab
le w
asco
nnec
ted
wel
l
Cop
ying
.
En dC
opyi
ng.
En d
Reference Information
Samsung ElectronicsService Manual
12.17 Glass Broken
Rep
lace
Sca
nnin
g U
nit A
ssy
Re-
Cop
ying
En d
Che
ck if
the
Scan
Gla
ssw
as b
roke
n
Service Manual
Reference Information
Samsung Electronics
12.18 Document Jam
Yes,
stil
l the
re is
Err
or M
essa
ge
Yes
No
No,
just
for c
opyi
ng jo
b w
ith A
DF
Yes
No
No
Yes
Che
ck if
rolli
ngso
und
can
behe
ard
Whe
n st
art t
he
Bec
ause
It is
acc
ause
d by
the
defe
cts
of A
DF
mot
or o
r AD
Fbo
ard,
Rep
lace
AD
F En
gine
Ass
y
Rep
lace
Mai
n PC
BA
Con
trol
ler B
oard
Che
ck if
ther
e is
[Doc
umen
t Jam
]m
essa
ge re
gard
less
of
rem
ovin
g th
edo
cum
ent f
rom
AD
Ft
Rep
lace
AD
F R
ubbe
r Pad
Che
ck if
AD
F is
pulli
ng D
ocum
ent
Fix
the
prob
lem
Bec
ause
It is
acc
ause
d by
the
defe
cts
of A
DF
Sens
or ,
Rep
lace
AD
F En
gine
Ass
y
Erro
r Mes
sasg
e is
disa
ppea
red?
Troubleshooting
Service Manual 6-1Samsung Electronics
666. Troubleshooting
6.1 The cause and solution of Bad image
6.1.1 Vertical Black Line and Band
• Description1. Straight thin black vertical line occurs in the printing.2. Dark black vertical band occur in the printing.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Damaged develop roller in the Toner car-tridge. Deformed Doctor-blade or clean-ing-blade.
2. Scratched surface of the charge roller inthe toner cartridge.
3. Partly depression or deformation on thesurface of the transfer roller.
1. If causes 1 and 2 occur in the toner car-tridge, replace the toner cartridge and tryto print out.
2. Replace the transfer roller if occurred asNo. 3.
6.1.2 Vertical White Line
• Description White vertical voids in the image.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Foreign matter stuck onto the window ofinternal lenses of LSU mirror.
2. Foreign matter or toner particles betweenthe toner cartridge roller and blade.(In case the life of the toner cartridge hasbeen expired, white lines or light imageoccur in front of the image.)
3. It may occur when Burr and foreign sub-stances are on the window of the tonercartridge frame.
4. If the fuser is defective, voids occur peri-odically at the top of a black image.
5. It may occur when foreign substancesare on the OPC Drum.
6. Partly depression or deformation on thesurface of the transfer roller
1. Foreign matter stuck onto the window :Clean the LSU window with recommend-ed cleaner(IPA) Clean the window with aclean cotton swab.
2.. Replace the toner cartridge.
3. No 3. : Remove the foreign matter andburr of the exposure window.(toner cartridge)
4. No. 4. : Open the front cover and checkribs that corresponds to the position ofthe voids. Remove if found.
5. If the problems are not solved, replacethe toner cartridge.
6. Replace the transfer roller if occured asNO.6
Service Manual
Troubleshooting
6-2Samsung Electronics
6.1.3 Horizontal Black Band
• Description1. Dark or blurry horizontal stripes occur in the printing periodically.
(They may not occur periodically.)
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Bad contacts of the voltage terminals totoner cartridge.
1. Clean each voltage terminal of the Charge,Supply, Develop and Transfer roller.(remove the toner particles and paper par-ticles)
2. Clean the right Gear that has relativelysmall gap of the teeth in the OPC.
3. If the malfunction persists, replace thetoner cartridge.
6.1.4 Black/White Spot
• Description1. Dark or blurry black spots occur periodically in the printing.2. White spots occur periodically in the printing.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. If dark or blurry black spots occur periodi-cally, the rollers in the Toner cartridgemay be contaminated with foreign matteor paper particles.( Charge roller : 37.7 mm intervalOPC drum : 75.5 mm interval)
2. If faded areas or voids occur in a blackimage at intervals of 95 mm, or blackspots occur elsewhere, the OPC drumsurface is damaged.
3. If a black image is partially broken, thetransfer voltage is abnormal or the trans-fer roller's life has expired.
1. Run OPC cleaning Mode Print and run theSelf-test 2 or 3 times.
2. In case of 95 mm interval unremovable in 1,cleanly remove foreign substances stuck onthe OPC location equivalent to black spotsand white spots with a dry duster.
3. The transfer roller guarantees 100,000sheets printing. If the roller's life is expired,replace it.
4. In case of 95 mm interval unremovable in 1,take measures as to replace the toner car-tridge and try to print out.
5. Clean the inside of the set against the paperparticles and foreign matter in order not tocause the trouble.
Troubleshooting
Service Manual 6-3Samsung Electronics
6.1.5 Light Image
• Description The printed image is light, with no ghost.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Develop roller is stained when the tonerof toner cartridge is almost consumed.
2. Ambient temperature is below than 10°C.
3. Bad contact caused by the toner stainsbetween the high voltage terminal in theHVPS and the one in the set.
4. Abnormal output from the HVPS.(Run self-test and check 1~4)
1. Check if the Toner Save mode is off.Check if the density is light.
2. No 1 : Replace the toner cartridge and tryto print out.
3. No 2 : Wait 30 minutes after printer is pow-ered on before you start printing.
4. No3 : Clean up the contaminated area bythe toner.
5. Replace the HVPS if the problems are notsolved by the above four instructions.
6.1.6 Dark Image or a Black Page
• Description The printed image is dark.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. No charge voltage in the engine board.
2. Charge voltage is not turned on due tothe bad contacts between power supplyin the side of the Toner cartridge andcharge terminal of HVPS.
3. VD0 signal of the Main PBA is Low state.
1. Check the state of the connector whichconnects the engine board and HVPS.
2. Clean the high voltage charge terminal.
3. Replace the HVPS if not solved by theabove direction 1 and 2.
4. Replace the LSU Unit or Main PBA.
Service Manual
Troubleshooting
6-4Samsung Electronics
6.1.7 Uneven Density
• Description Print density is uneven between left and right.
Check and Cause Solution
1. The pressure force on the left and rightsprings of the transfer roller is not even,the springs are damaged, the transferroller is improperly installed, or the trans-fer roller bushing or holder is damaged.
2. The life of the Toner cartridge hasexpired.
3. The toner level is not even on the tonercartridge roller due to the bad blade.
1. Replace both the left and right SpringHolder.
2. Occur in the toner cartridge gently shakethe toner cartridge.
3.Replace the toner cartridge and try to printout.
6.1.8 Background
• Description Light dark background appears in whole area of the printing.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Does character exist less than 2%per a page, and hasn’t it been usedlong time?
2. Is a recycled toner cartridge beused?
3. Has the life span of the toner car-tridge ended?
4. Is the movement(Up and Down) ofthe transfer roller smooth?
5. Is the HVPS normal?
1. The toner cartridge is basicallydesigned to print 7K sheets with 5%image. If it prints more than 8K sheetswith 2% coverage, a background canoccur.
2. The A/S is not guaranteed if using arecyled the toner cartridger.
3. Replace the toner cartridge when thelife span of it has been ended.
4. Clean the bushing part of the transferroller.
5. If the problem is still not solved,replace the toner cartridge.
6. Gently shake the toner cartridge.
Troubleshooting
Service Manual 6-5Samsung Electronics
6.1.9 Ghost (1)
• Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
95 mm
Check and Cause Solution
1. Bad contacts caused by contaminationfrom toner particles between high voltageterminal in the main body and the elec-trode of the Toner cartridge.
2. Bad contacts caused by contaminationfrom toner particles between high voltageterminal in the main body and the one inthe HVPS board.
3. The life of toner cartridge is expired.
4. Transfer roller lifetime(70K sheets) has expired.
5. Abnormal low temperature(below 10°C).
6. Damaged cleaning blade in the toner car-tridge.
1. Clean the terminals when contaminated bytoner particles.
2. Occur in the toner cartridge, replace thetoner cartridge and try to print out.
3. Replace the engine board if not solved bythe above directions 1-2.
4. If not solved by the direction 3, check thetransfer roller lifetime and replace it.
5. Wait about 1 hour after power on beforeusing printer.
6. Occur in the toner cartridge, replace thetoner cartridge and try to print out.
6.1.10 Ghost (2)
• DescriptionGhost occurs at 95 mm intervals of the OPC drum in the whole printing.(When printing on card stock or transparencies using manual feeder)
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
95 mm
Check and Cause Solution
When printing on card stock thicker than nor-mal paper or transparencies such as OHP,higher transfer voltage is required.
Select 'Thick Mode' on paper type menu fromthe software application and after using return-ing to the original mode is recommended.
Service Manual
Troubleshooting
6-6Samsung Electronics
6.1.11 Ghost (3) : Fuser
• Description Ghost occurs at 82 or 92 mm intervals.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
82 or 92 mm
Check and Cause Solution
The temperature of the fuser is maintainedhigh.
1. Disassemble the fuser and remove thecontaminated toner particles on the rollerand clean the foreign matter betweenThermistor and Heat roller. (Caution: can be deformed)
6.1.12 Stains on the Face of Page
• Description The background on the face of the printed page is stained.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
1. Toner leakage due to improperly sealedtoner cartridge.
2. If the transfer roller is contaminated, stainson the face of page will occur.
1. Replace the toner cartridge.
2. If the transfer roller is contaminated, run PCCleaning Mode Print 2 or 3 times.And perform Self-Test 2 or 3 times toremove contamination.
Troubleshooting
Service Manual 6-7Samsung Electronics
6.1.13 Stains on Back of Page
• Description The back of the page is stained at 57 or 92 mm intervals.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
82 or 92 mm
Check and Cause Solution
1. 57mm : Transfer roller is contaminated.
2. 92mm : Pressure roller is contaminated.
1. Perform the OPC Cleaning Mode Print 2 or3 times. Run Self-Test to remove the conta-mination of the transfer roller.
2. Replace the transfer roller if contaminatedseverely.
3. Disassemble the fuser and clean theH/R(Heat Roller) and P/R(Pressure roller).And check the area between H/R andThermistor. If contaminated, clean the areanot to be deformed.
6.1.14 Blank Page Print out (1)
• Description Blank page is printed.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Check and Cause Solution
Bad ground contacts in OPC and/or tonercartridge.
1. Check if the Ground-OPC is defective(setinside left side).
2. Remove contamination of the terminals ofthe toner cartridge and the unit.
6.1.15 Blank Page Print out (2)
• Description1. Blank page is printed.2. One or several blank pages are printed.3. When the printer turns on, several blank pages print.
Check and Cause Solution
1. Bad ground contacts in OPC and/or tonercartridge.
2. Abnormal solenoid.
1. Remove contamination of the terminals ofthe toner cartridge.
2. Perform the engine self test using EDC Mode tocheck if the Solenoid is normal.
3. If not solved by the above directions 1-2,Replace the engine board.
4. Turn the power off, delete the data of PCand try printing again.
Service Manual
Troubleshooting
6-8Samsung Electronics
6.2 The cause and solution of the bad discharge
6.2.1 Wrong Print Position
• Description Printing begins at wrong position on the paper.
Check and Cause Solution
Wrong sense time caused by defective feed sensoractuator.
Replace the defective actuator
6.2.2 JAM 0
• Description1. Paper is not exited from the cassette.2. Jam-0 occurs if the paper feeds into the printer.
Check and Cause Solution
1. Check the Solenoid by using EDCMode.
2. Check if the pad is loose due to badsealing of the side-pad.
3. Check the surface of the roller-pick-up for foreign matter.
4. If continuous clusters occur, checkwhether the assembly slot betweenshaft-pickup and housing-pickupopens or is broken away.
5. If the paper feeds into the printer andJam 0 occurs, perform EDC Mode tocheck feed-sensor of the engineboard.
1. Replace the solenoid.
2. Replace the side-pad Assembly L orR, if necessary.
3. Clean with soft cloth dampened withIPA(Isopropyl Alcohol) or water.
4. Replace the Main PBA and/or Sensor.
Troubleshooting
Service Manual 6-9Samsung Electronics
6.2.4 JAM 2
• Description1. Recording paper is jammed in front of or inside the fuser.2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the
Actuator-Feed.
Check and Cause Solution
1. If the paper is completely fed out ofthe printer, but Jam 2 occurs : Exitsensor is defective.• After the paper is completely dis-
charged, actuator Exit should returnto the original position to shut thephoto-sensor. Sometimes it takeslonger hour than it should and doesnot return.
2. If the paper is rolled in the Fuser Roller:• This occurs when a Guide claw is
broken away or transformed.• It occurs when the Spring of a Guide
claw is broken away or transformed.• It occurs when the Heat-Roller or
Pressure-Roller is seriously contami-nated with the toner.
3. Paper is accordion in the fuser.
1. Check if the exit sensor actuator isdefective.• Check if the actuator exit is deformed
(Check if the lever part is deformedin shape).
• Check whether burrs occur in theassembly part of the actuator exit ornot and if the actuator is smoothlyoperated.
• Check if foreign matter and wire getcaught in the actuator exit's operation.
2. If the paper is stuck in the fuser : dis-assemble the fuser and remove thejammed paper, and clean the surfaceof the pressure roller with dry gauze.
3. Remove the jammed paper after disas-sembling the fuser : Clean the surfaceof the pressure roller with dry gauze.• Remove the toner particles stained
on the rib.• Check the assemblage and perfor-
mance of the exit.
6.2.3 JAM 1
• Description1. Recording paper is jammed in front of or inside the fuser.2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the
Actuator-Feed.
Check and Cause Solution
1. If the recording paper is jammed infront of or inside the fuser.
2. If the recording paper is stuck in thedischarge roller and the fuser justafter passing through the Actuator-Feed, Feed Actuator may be defec-tive.
1. Replace the SMPS or Exit-Sensor.
2. Replace the Main PBA.
3. Reassemble the Actuator-Feed andSpring-Actuator if the movement isbad.
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6-10Samsung Electronics
6.2.6 JAM Duplex 2
• Description A message 'Jam duplex 2' is displayed in a LCD window.
Check and Cause Solution
1. It is a case that a paper cannot passa duplex sensor.
2. It is a case that a paper cannot reachto a registration sensor after it ispassed a duplex sensor.
1. Replace a SMPS or main PBA.
2. A case that a leading edge of a paperis jammed on (A) check an operation ofa guide front. If it is worn or defective,replace it.
3. Check an operation of a feed rollerand a registration roller. If they are wornor defective replace them.
6.2.5 JAM Duplex 1
• Description A message 'Jam duplex 1' is displayed in a LCD window.
Check and Cause Solution
1. It is a case when a paper can-not operate a duplex sensor.
2. It is a case when a paper can-not reach to a duplex sensordue to a paper jam on a duplexpath.
1. Replace a SMPS or main PBA
2. A case that a paper jam occurs on(A) after it is reversed: replace a2nd exit roller after checking itsoperation.
3. A case that a paper jam occurs on(B) after it is reversed: replace aduplex roller after checking itsoperation
Troubleshooting
Service Manual 6-11Samsung Electronics
6.2.7 Multi-Feeding
• Description Multiple sheets of paper are fed at once.
Check and Cause Solution
1. Check the Guide side L/R or Guide Rear in theCassette, if the position is correct.
2. Solenoid malfunction(the solenoid does not workproperly): Perform EDC Mode.
3. Pad-Friction is contaminated with foreign matter.(oil...)
4. The face of paper is blended.
1. Replace the solenoid if necessary.
2. Replace the Main PBA.
3. Clean the pad friction with soft cloth dampened withIPA(Isopropyl Alcohol).
4. Use the smooth paper.
6.2.8 Paper rolled in the fuser
• Description If contaminated at intervals of 57mm on the back of a paper.
Check and Cause Solution
1. Contamination of the pressure roller or heatroller (Background, Hot off set).
2. Check the claw of the fuser whether it isdeformed.
1. After disassembling the fuser, clean contami-nation between the heat roller and the ther-mostor and remove the contamination of thepressure roller.
2. If there is heavy background, repair it by thebackground troubleshooting method.
3. Clean the surface of the heat roller with IPA orwater
4. Check the warp or separation of the print clawand the holder plate claw, and then manage it.
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6-12Samsung Electronics
6.2.9 Paper rolled on the OPC Drum
• Description Paper is rolled up in the OPC.
Check and Cause Solution
1. Paper is too much thin.
2. The face of paper is curled.
1. Recommend to use normal paper.
2. How to remove the rolled paper in the OPC.• Remove the paper while turning the OPC against
the ongoing direction. • Clean fingerprints on the OPC softly with soft
cloth dampened with tissue.
Troubleshooting
Service Manual 6-13Samsung Electronics
6.3 The cause and solution of the malfunction
6.3.1 Fuser Error
• Description A message "Open fuser/Over heat/Low heat' is displayed in a LCD panel.
Check and Cause Solution
1. Check whether a thermostat, AC wire, and heatlamp are open or not.
2. Check whether a thermistor is open or not.
3. Heat lamp ON/OFF test
4. It could not operate due to a gear of a fuser ismelted.
1. Replace the fuser if a thermostat is open.
2. Replace the fuser if a thermistor sensor islocated deep inside of a sponge.
3. Check whether the overheat mode circuitoperates normally or not.
4. Replace the fuser.
6.3.2 LSU Error
• Description A message "PMOTOR ERROR/HSYNC ERROR' is displayed in a LCD panel.
Check and Cause Solution
1. Check whether the LSU connector is disconnected ornot.
2. Check whether the LSU motor is rotating or not.
3. Check the HSYNC signal.
- Replace a LSU
- Replace a main board if the same error occurs againafter replacing a LSU.
Service Manual
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6-14Samsung Electronics
6.3.3 Not function of the gear of the fuser due to melting away
• Description The motor breaks away from its place due to gear melting away.
Check and Cause Solution
1. Check the Heat Lamp. 1. Replace the Fuser.
2. Replace the Main PBA.
2. Replace the SMPS.
6.3.4 Paper Empty
• Description The paper lamp on the operator panel is on even when paper is loaded in the cassette.
Check and Cause Solution
1. Bending or deformation of the actuator of the paper sen-sor.
2. The function of the engine board is defective
3. Check the Connector.
1. Replace the defective actuator.
2. Replace the Sensor PBA.
Troubleshooting
Service Manual 6-15Samsung Electronics
6.3.5 Paper Empty without indication
• Description The paper lamp on the operator panel does not come on when the paper cassette is empty.
Check and Cause Solution
1. Bending or deformation of the actuator of the paper sen-sor.
2. The function of the engine board is defective
1. Replace the defective actuator.
2. Replace the engine board.
6.3.6 Cover Open
• Description The ERROR lamp is on even when the print cover is closed.
Check and Cause Solution
1. The hook lever in the top cover may be defective.
2. Check the connector and circuit of the cover switchdepartment in the Main Control board.
1. Replace the hook lever, if defective.
2. Check the insertion of the Cover Open S/WConnect.
3. Replace the Main Control board or Cover OpenS/W.
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Troubleshooting
6-16Samsung Electronics
6.3.7 No error message when the cover is open
• Description The ERROR message does not come on even when the printer cover is open
Check and Cause Solution
1. Check the connector and circuit of the cover switchdepartment in the Main Control board. Perform EDCmode
1. Check the insertion of the Cover Open S/WConnect.
2. Replace the Main Control board or Cover OpenS/W.
Troubleshooting
Service Manual 6-17Samsung Electronics
6.3.8 Defective motor operation
• Description Main motor is not driving when printing, and paper does not feed into the printer, resulting 'Jam 0'.
Check and Cause Solution
1. The Motor harness or Motor PCB may be defective.
2. Check the motor operation in the EDC Mode.
1. Check the motor harness, replace it, if defective.
2. Replace the Main PBA.
6.3.9 No Power
• Description When system power is turned on, all lamps on the operator panel do not come on.
Check and Cause Solution
1. Check if the power input and SMPS output are normal.
2. Check the inferiority of LED-Panel or LDC window on thefront-cover if the OP panel does not appear after normalwarming-up.
1. Replace the power supply cord or SMPS.
2. Replace the control board.
3. Replace the OP panel.
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6-18Samsung Electronics
6.3.10 Vertical Line Getting Curved
• Description When printing, vertical line gets curved.
Check and Cause Solution
1. If the supply of +24v is unstable in the Main Control boardlinking with LSU, check drive by EDC Mode: LSU Check.
2. Chect the Deve PBA in the Toner Cartridge.
1. Replace LSU.
2. Replace theToner Joint PBA.
2. Replace the MainPBA.
Troubleshooting
Service Manual 6-19Samsung Electronics
6.4 Toner Cartridge Service
It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the
Samsung Electronic or caused by non-licensed refill production.
6.4.1 Precautions on Safe-keeping of Toner CartridgeExcessive exposure to direct light more than a few minutes may cause damage to the cartridge.
6.4.2 Service for the Life of Toner CartridgeIf the printed image is light due to the life of the toner, you can temporarily improve the print quality by redistributing the
toner(Shake the toner cartridge), however, you should replace the toner cartridge to solve the problem thoroughly.
6.4.3 Distinguish function for choice cartridge
• Distinguish function for choice cartridgeAn EEP ROM is mounted to a cartridge for distinguishing a choice toner cartridge. Items written in below
are detected by checking up memory information.
If the data of the EEP ROM is broken, it cannot be detected.
1) Detecting existence of a toner cartridge: It detects whether a toner cartridge is mounted or not.
2) Detecting a serial number of a toner cartridge.
3) Detecting a toner cartridge supplying company: If it is not Samsung’s, it is not operated.
4) Detecting an OPC rotating counter: It detects the life span of an OPC drum.
• Distinguish a refilled cartridge. (with eyes)1) Check whether One-way screw is damaged or not
2) Check the cartridge on configuration sheet(Print out the self-test configuration)
: Manufacture date and serial number of toner cartridge are different(permissible range : +/- 1).
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6-20Samsung Electronics
6.4.4 Error message (LCD window) related in a toner sensorIt explains a message related in toner sensor in a LCD.
6.4.4.1 Invalid Toner- Contents: It is displayed when a supplier is different between a toner cartridge and a set. If this message is shown up,
a printing process cannot operate.
- Solution: Attach a suitable toner cartridge (the same supplier's) to a set. (A unique key has been applied.)
6.4.4.2 Low Toner- Contents: This message shows up when a message "remaining toner: 10%" is displayed in a cartridge count informa-
tion.
- Solution: It means that a toner in the toner cartridge has been almost ended. Repare the new toner cartridge.
6.4.4.3 Replace Cartridge- Contents: It means the life span of a toner cartridge (except a toner part) has been ended. Even though a case that a
toner is refilled, the rest of major parts have been ended, so entire toner cartridge might be replaced.
- Solution: If an Toner Cartridge Life cycle Probreum, in a worst case, a toner overflows and it may cause a system fail.
Therefore, recommend a user to replace a toner cartridge.
Troubleshooting
Service Manual 6-21Samsung Electronics
6.4.5 Signs and Measures at Poor toner cartridge
Fault Signs Cause & Check Solution
Light image andpartially blankimage(The life is ended.)
TonerContamination
• The printed imageis light or uncleanand untidy.
• Some part of theimage is not print-ed.
• Periodically a noiseas "tick tick" occurs.
• Toner is fallen onthe papers periodi-cally.
• Contaminated withtoner on prints part-ly or over the wholesurface.
1. If the image is light or uncleanand untidy printed image -Shake the toner cartridge andthen recheck.
(1)NG: Check the weight of thetoner cartridge
(2)OK: Lack of toner, so the lifeis nearly closed.
2. Some part of image is notprinted - Shake the tonercartridge and then recheck.
(1)NG: Check the weight of thetoner cartridge andclean the LSU windowwith a cotton swab,then recheck.
(2)OK: Lack of toner, so the lifeis nearly closed.
3. Periodically a noise as "ticktick" occurs - Measure thecycle and the weight of thetoner cartridge.
4. White vertical stripes on thewhole screen or partly : Check the weight of the tonercartridge.
1. Toner is fallen on the paperperiodically.
(1)Check the cycle of thefalling of the toner.
(2)Check the appearance ofboth ends of the toner car-tridge OPC drum.
2.The center of the printed mat-ter is contaminated with toner.(1)Check whether foreign sub-
stances or toner are stuckto the terminal (contactpoint) of the toner cartridge.
(2)Check whether the state ofthe terminal assembly isnormal.
1. All of 1, 2, 3 above-If it become better by shaking,replace with a new toner car-tridge after 50-100 sheets in theclosing state of the life span.
2. In case of 2-If it becomes better after clean-ing the LSU window, then thetoner cartridge is normal.(Because of foreign substanceon the LSU window, the imagehas not been printed partly.)
3. In case of 3-If the cycle of noise is about 2seconds, the toner inside thetoner cartridge has been nearlyexhausted.( Purchase andreplace with a new toner car-tridge after using about 200sheets at the point of occur-rence)
4. In case of 3-This is a phenomenon causedby lack of toner, so replace witha new toner cartridge.
1. If both ends of the OPC drumare contaminated with toner:Check the life of the toner car-tridge.
2. Check whether it could be recy-cled.
3. If it cannot be recycled:Replace the toner cartridge.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
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6-22Samsung Electronics
Fault Signs Cause & Check Solution
White Black spot
Recycled product
• Light or dark blackdots on the imageoccur periodically.
• White spots occurin the image period-ically.
• Poor appearance ofthe toner cartridge.
• Unclean and roughprintouts.
• Bad background inthe image.
1. If light or dark periodical blackdots occur, this is because thetoner cartridge rollers are cont-aminated with foreign sub-stance or paper particles.(1)38mm interval : Charged
roller(2)95mm interval : OPC cycle
2. If white spots occur in a blackimage at intervals of 95mm, orblack spots occur elsewhere,the OPC drum is damaged orforeign substance is stuck tothe surface.
3. If a black and white or graphicimage is partially broken atirregular intervals, the transferroller's life has been expired orthe transfer voltage is abnor-mal.
1. Poor appearance of the tonercartridge.
(1)Check the damage to labeland whether different materi-als are used.
(2)Check the appearance ofparts of the toner cartridge,such as frame, hopper.
2. Unclean and rough printouts.(1)Check whether foreign sub-
stance or toner are stuck tothe terminal (contact point) ofthe toner cartridge.
(2)Check whether the state ofthe terminal assembly is nor-mal.
1. In case of 1 above -Run OPC Cleaning Mode Print4-5 times repeatedly to remove.Especially check foreign sub-stance on the OPC surface, thenremove them with a clean gauzemoistened with IPA(IsopropylAlcohol) not to damage OPC ifnecessary.
Never use usual alcohol.
2. In case of 2If they are not disappeared byrunning OPC Cleaning ModePrint 4-5 times. : at intervals of 38mm - Replacethe toner cartridge.
: at intervals of 95mm - Removeforeign substance.
: Broken image - Replace thetoner cartridge according tocarelessness.
3. In case of 3 - Exchange thetransfer roller because the life ofthe transfer roller in use has beenexpired. (Check the transfer volt-age and readjust if different.)
1. In case of 1 -(1)If there is an evidence of disas-
sembling the toner cartridge.(2)If materials other than normal
parts of the toner cartridge areadded or substituted.
2. In case of 2 - If there are anyabnormals in connection with thesituation of 1.(1)It occurs when the toner car-
tridge is recycled over 2 times.(2)If toner nearly being expired
are collected to use, it isjudged as the recycled tonercartridge.
Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital Printer
Troubleshooting
Service Manual 6-23Samsung Electronics
Fault Signs Cause & Check Solution
Ghost & ImageContamination
• The printed imageis too light or dark,or partially contami-nated black.
(1)Check whether foreign sub-stances are stuck to the ter-minal(point of contact) of thetoner cartridge and the stateof assembly. (Especially check thecharged roller terminal.)
3. The printed image is dark andghost occurs.
(1)Check foreign substanceattached to the terminal(point of contact) of thetoner cartridge and the stateof assembly. (Especially check the devel-oping roller terminal.)
1. All of 1, 2, 3 above(1)Remove toner and foreign sub-
stances adhered to the contactpoint of the toner cartridge.
(2)The contact point of the unitfacing that of the toner car-tridge also must be cleaned.
(3)If the terminal assembly isunsafe:
• Fully stick the terminal to orreassemble it after disassem-bling.
• Disassemble the side plate andpush the terminal to be stuck,then reassemble it.
2. In case of 2It is a phenomenon when theOPC drum of the toner cartridgeis not electrically charged. Cleanthe terminals of the chargedroller, then recheck it.
3. In case of 3It is a phenomenon as the devel-oping bias voltage of the tonercartridge. Clean the terminals ofthe developing roller, thenrecheck it.
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Troubleshooting
6-24Samsung Electronics
6.5 The cause and solutions of bad environment of the software
6.5.1 The printer is not working (1)
• Description While Power turned on, the printer is not working in the printing mode.
Check and Cause Solution
1. Run Self-Test Mode: Turn the power on while pressingthe test printing button for 2 or 3 seconds before printingworks.
2. Check if the PC and the printer is properly connectedand the toner cartridge installed.
3. Printing is nor working in the Windows.
4. Check if the printer cable is directly connected to periph-eral devices
1.Check the power of the printer and perform the Self-Test. If the test printing works, that means no prob-lems in the printer itself. If the test printing does notwork, that means bad functioning of the printer(notbecause of software).
2. Replace the printer cable. If the problems not solvedeven after the cable replaced, check the amount ofthe remaining tone.(refer to Toner Cartridge Service 4-5)
3. Check if the connection between PC and printer portis proper. If you use windows, check if the printer dri-ver in the controller is set up. If the printer driver isproperly set up, check in which program the printingis not working. The best way to find out is to open thememo pad to check the function of printing. If it is notworking in a certain program, adjust the setup theprogram requires. Sometimes, the printout is normalwithin the Windows basic programs, but it's not work-ing in a particular program. In such case, install thenew driver again. If not working in the Windows basicprogram, Check the setup of the port of CMOS is onECP. And check the address of IRQ 7 and 378
4. If the scanner needs to be connected to the printer,first the remove the scanner from the PC to see if theprinter is properly working alone.
Troubleshooting
Service Manual 6-25Samsung Electronics
6.5.2 The printer is not working (2)
• Description After receiving the printing order, no response at all or the low speed of printing occurs due to wrong setup of the environment rather than malfunction of the printer itself.
Check and Cause Solution
1. Secure more space of the hard disk.
2. Printing error occurs even if there is enough space inthe hard disk.
3. Check the parallel-port-related items in the CMOSSetup.
4. Reboot the system to print.
1. Not working with the message 'insufficient printermemory' means hard disk space problem rather thanthe RAM problem. In this case, provide more spacefor the hard disk. Secure more space using the diskutilities program.
2. The connection of the cable and printer port is notproper. Check if the connection is properly done andif the parallel port in CMOS is rightly set up.
3. As a printer port, Select ECP or SPP amongSPP(Normal), ECP, and EPP modes(increase print-ing speed) SPP normal mode support 8-bit datatransfer, while ECP Mode transfer the 12-bit data.
4. If the regular font is not printing, the cable or theprinter driver may be defective.Turn the PC and printer off, and reboot the systemto print again. If not solved, double-click the printer inmy computer If the regular fonts are not printed thistime again. the cable must be defective so replacethe cable with new one.
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6.5.3 Abnormal Printing
• Description
The printing is not working properly even when the cable has no problem.(even after the cable is replaced) If the printer won't work at all or the strange fonts are repeated, the printer driver may be defec-tive or wrong setup in the CMOS Setup.
Check and Cause Solution
1. Set up the parallel port in the CMOS SETUP.
2. Printer Driver Error.
3. Error message from insufficient memory. (The printing job sometimes stops or due to insufficientvirtual memory, but it actually comes from the insuffi-cient space of the hard disk.)
1. Select SPP(Normal) or ECP LPT Port the amongECP, EPP or SPP in the CMOS Setup.
2. Check the printer in My Computer.(to see if theprinter driver is compatible to the present driver ordelete the old driver, if defective and reinstall the newdriver)
3. Delete the unnecessary files to secure enoughspace of the hard disk and start printing job again.
Troubleshooting
Service Manual 6-27Samsung Electronics
6.5.4 SPOOL Error
• Description
To spool which stands for "simultaneous peripheral operations online" a computer document ortask list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium sothat it can be printed or otherwise processed at a more convenient time (for example, when aprinter is finished printing its current document).
Check and Cause Solution
1. Insufficient space of the hard disk in the directoryassigned for the basic spool.
2. If the previous printing error not solved.
3. When expected to collide with other program.
4. When an application program or the printer driver isdamaged.
5. When some files related to OS are damaged or virusinfected.
6. Memory is less than suggested one.
1. Delete the unnecessary files to provide more spaceto start printing job.
2. If there are some files with the extension name of****.jnl, Delete them and Reboot the Windows torestart printing job.
3. Shut down all other programs except the currentone, if possible.
4. Delete the printer driver completely and reinstall it.
5 After rebooting the computer, check for viruses,restore the damaged files and reinstall the programto do the printing job.
6. Add up enough memory to the PC.
How to delete the data in the spool manager.
In the spool manager, the installed drivers and the list of the documents waiting to be printed are shown. Select the document to be deleted and check the delete menu.
If you intend to delete the current document being printed, the data being transferred to the printer will be putout and then the document is removed. Before choosing the document, the menu is still inactive.
Or put the document out of the list and repeat the routine as in the above or finish the spool manager.