LASER PRINTER

ML-1440

SERVICE

Manual

CONTENTS

1. Precautions 2. Specifications 3. Disassembly and Reassembly 4. Troubleshooting 5. Exploded Views and Parts List 6. Block Diagram 7. Connection Diagram
This service manual is also provided on the web, the ITSELF system f Samsung Electronics Co., Ltd. http://itself.sec.samsung.co.kr
Samsung Electronics Co.,Ltd. JUNE 2002 Printed in Korea. VERSION NO. : 1.02 CODE : JC-0066A
This manual is stated and provided for service description.
All rights reserved. Any parts of the information in this manual are prohibited from free duplication, use or translation without prior written approval except in cases allowed by the Copyright Act. Specifications are subject to change without prior notice.
Samsung Electronics Digital Printing CS Group

Copyright (c) 2002. 6.

Repair Manual

SAMSUNG LASER PRINTER

ML-1450Series
1. Block Diagram 2. Connection Diagram 3. Schematic Diagrams

Electronics

SAMSUNG
This manual is made and described centering around circuit diagram and circuit description needed in the repair center in the form of appendix.

Copyright (c) 2002. 1

SPGPe (KS32C61100)
Sys Cntl BUS Sys Addr BUS Sys Data BUS

CPU DATA BUS

CPU Addr BUS
OSC. 20MHz PROGRAM ROM (FLASHMEMORY) 512K*16b*2EA

POWER ON RESET

/CS,/RD ,/W R CPU DATA BUS CPU ADDR. BUS

ARM 7TDM I Cache 8 KB

FONT ROM (MASK ROM) 512K*16b*2EA
DATA ROM (DRAM) 1M*16b*2EA
SIMM (Up to 64MB) (Option)
Post Script 3 (Flash : 2MB Font : 2MB) (Option)

1. Block Diagram

Samsung Electronics
SYSTEM DATA BUS SYSTEM ADDR. BUS MA MD RAS CAS EDO / FPM DRAM Control (4Bank) GEU
Reset & W D T Generation

A/D Bu s

RCS RD WR
ROM/SRAM/ FLASH ROM Control (4 Bank)

I/O Control (5 Bank)

CPU B u s In te rf ace Blo ck
NETWORK INTERFACE (Option)
PANEL INTERCACE MOTOR CONTROL NV RAM INTERCACE I /O INTERFACE SENSORS INPUT SOLENOID CONTROL 74HC245*2EA FAN/PTL CONTROL 74LS273*3EA LSU INTERFACE HVPS CONTROL
Interrupt Control (4 External) PVC

Timer (3 CH) PPI

S yste rm Bu s I nt erfa ce B loc k [A rbite r]

Tone Generator

UA RT ( 3 CH)

DMAC (2 CH)

PARALLEL INTERFACE
OSC.(Video) 53.0109277MHz OSC. 48 MHz

Engine Comm. I/F

USB INTERFACE IC (USBN9602) USB INTERFACE
FUSER CONTROL SCF INTERFACE

RAM : 512B HPVC

LR AM :1296B C XRAM :256B

AD C RAM 512B + 512B

Laser Diode Vcc on LSU [ LASER DIODE ON/OFF SWITCH ]
THERM STOR ADC INPUT THV READ ADC INPUT

SUPPLY 5V to each ICS

SUPPLY 24V to Motor/HVPS/FAN/LSUA

BLOCK DIAGRAM

24VS [ COVER OPEN SWITCH ]

CONNECTION DIAGRAM

2. Connection Diagram
Si ze /E mp ty /Fe ed /Ma nual Senso r s ar e on B d
Mic r o Sw it ch on Board In- 24V Out- 24V S

Ther mistor

T herm1 T herm2 DCU (For Sys t em Tes t ) 1234CNCN5V RXD TX D GND- 5V CNPT L Ct rl 5V CN3 CN1

1- 24V S

2- GN D _2 4
1- GND_5 2- GND_5 3- 5V 4- 5V 5- GND_6- GND_7- 24V S 8- 24V S 9- 24V 10- 24V
Remark : Normal Connec t or : Board on t y pe Connec t or

CNSolenoid

4- GND _5 V

5- T H V _PWM

1- / MP_EMPT Y 2- GND_5 3- 5V 1- 24V S 2- MP_CL UT CH

MP Tray (Option)

6- T HV RD 7- / T H V _EN 8- / MHV _PWM

9- / DEV _PWM

10- PT L

11- N.C.

Joint t y pe 1- Ther m1 2- Ther m2
CN5 1- Sav e 2- P_Nar r ow 3- Empt y 4- Feed 5- FA N 6- Clut ch 7- Fus er 8- MP_Clut c h 9- MP_Empt y 10- Mot or _PA 11- Mot or _PB 12- / Mot or _PA 13- / Mot or _PB 14- SCF_Cass ete 15- SCF_Mot or 16- SCF_Clut ch 17- SCF_Empt y 18- N.C. 19- T herm2 20- T herm1 21- 5V 22- EXT _Clo ck 23,2 4- 5V 25- 5V PS 26,2 7,28- GND_5 V

2- SC F_Sel C as set t e

12- N.C.
3- SCF_Mot or 4- SCF_CL UT CH

5- SC F_Empt y 6- 24V S

Exit Sensor

( For L SU 5 V S Cut )

1 - 5V 2 - Ex it _s ignal 3 - GND_- 5V 2 - 5V S 123456/ HSYNC 5V S GND_5 / LD_ON / VDO LSUPOWE R7- 24V S 8- GND_9- P_MOT OR 10- / LREA DY 11- EXT _CL K 123456785V GND_5 LED1 LED2 LED3 LED4 Key 1 Key 2

7,8- GND_5

SCF (Option)

Micro- Switch

Controller

CN6 CN3

CN3 CN8
Mot o_PA Mot or _PB / Mot or_PB Mot or _PA

QTY 1 2

SA O O O X O O X O O O O O O O O O O O X O O O X X O X X X X O O X X X X X X X

REMARK

110V 220V 110V 220V 110V 220V

Optional Optional

O: Service available X: Service not available
5-2 Top Assembly Exploded view
< Top Assembly Parts List >
DESCRIPTION ELA HOU-COVER MAIN PMO-COVER OPEN COVER-MAIN 1440 PMO-CAP REAR PMO-STOPPER HINGE OPEN PMO-LENS LED PMO-KEY BUTTON PMO-KEY SAVE MODE PBA SUB-PANEL_II PMO-SUPPORT MAIN PMO-STOPPER_EXIT,P PMO-COVER REAR PMO-STACKER REAR IPR-SPRING LOCKER REAR SCREW-TAPTITE
SEC CODE See below table * * * * * * * * * * * * * *
SA O X X X X X X X X X X X X X X

ELA HOU-COVER MAIN

Model ML-1440/XAA ML-1440/XAC ML-1440/XAP ML-1440/XAX ML-1440/XEG SEC.Code JC96-02269F JC96-02269F JC96-02269W JC96-02269W JC96-02269F Model ML-1440/XEU ML-1440/XEV ML-1440/XIL ML-1440/XSA ML-1440/XST SEC.Code JC96-02269F JC96-02269U JC96-02269P JC96-02269F JC96-02269F
5-3 Frame Assembly Exploded view

15-1 15-2

16-1 16-2 16-3 16-4

18-1 18-2

22-3 22-4

49-3 30-3 49-2 49-1

30-2 31-3 31-2

32-2 32-1 28-2 28-1

24-1 24-2

25-1 25-2

29-1 29-2
< Frame Assembly Parts List >
NO 15 15-1 15-2 15-16-1 16-2 16-3 16-18 18-1 18-19-1 19-22-1 22-2 22-24 24-1 24-25-1
DESCRIPTION ELA UNIT-FRAME BASE ELA UNIT-FRAME BASE FAN-DC-HAWK PMO-GUIDE RIB CBF HARNESS-INLET ASSY PMO-HOLDER WIRE KEY DEVE GEAR-EXIT /U ID CBF-HARNESS_FUSER PBA SUB-EXIT SENSOR CBF-HARNESS-THERMISTOR JOINT CBF-HARNESS-MP_CLUTCH ENG PBA SUB-FUSER SW PMO-FRAME COVER IPR-TERMINAL FU ELA-UNIT-HOLDER TR L PMO-BUSHING TR SPRING TR L PMO-TRANSFER HOLDER ELA-UNIT-HOLDER TR R PMO-BUSHING TR SPRING TR R PMO-TRANSFER HOLDER IPR-PLATE TR GEAR-TR 29 ELA UNIT-GUIDE DEVE L PMO-GUIDE DEVE L SPRING GUIDE DEVE ELA UNIT-GUIDE DEVE R PMO-GUIDE DEVE R SPRING GUIDE DEVE ELA HOU-VARISTOR IPR-TERMINAL TR ELA UNIT-SENSOR DEVE PBA SUB-SWITCH PMO-HOLDER ACTUATOR PMO-ACTUATOR DEVE GROUND FU ELA UNIT-TERMINAL TR S ICT-SHAFT HV LARGE SPRING-HV LARGE ELA UNIT-TERMINAL TR L ICT-SHAFT HV LARGE

REMARK 110V 220V

110V 220V
5-6 Rack-MPF Assembly Exploded view
< Rack-MPF Assembly Parts List >
DESCRIPTION ELA HOU-MPF PMO-FRAME_MP PMO-PLATE MANUAL BRACKET-MANUAL SCREW TAPTITE
SEC CODE JC97-01345A * * * *

SA O X X X X

5-7 Drive Assembly Exploded view
< Drive Assembly Parts List >
DESCRIPTION ELA UNIT-MOTOR 14 MOTOR-STEP IPR-BRKT GEAR IPR-BRKT MOTOR GEAR-RDCN 145-70 GEAR-RDCN 90-24 GEAR-OPC DRV 135 GEAR-OPC DRIVE2 GEAR-FEED DRV GEAR-CLUTCH 56 GEAR-FUSER DRV23 PMO-CLUTCH LEVER SPRING-CLUTCH WASHER-PLAIN MPR-POLYWASHER 8 WASHER-PLAIN SCREW-MACHINE
SEC CODE JC96-02058A JC31-00010A * * * * * * * * * * * * * * *
SA O O X X X X X X X X X X X X X X X
5-8 Pick-Up Assembly Exploded view
< Pick-Up Assembly Parts List >
DESCRIPTION MEA UNIT-FEEDER SCREW-TAPTITE WASHER-PLAIN SPRING-FEED(1) SPRING-FEED(2) BEARING-PICK UP GEAR-P/UP DRIVE GEAR-FEED GEAR-PICK UP(12) IPR-SHAFT FEED IPR-SHAFT FEED IDLER IPR-SHAFT PICK UP GROUND_FEED IPR-GUIDE_FEED PMO-HOUSING P/UP PMO-ROLLER FEED L PMO-ROLLER FEED S PMO-SUB HOLDER FEED PMO-FRAME_FEED PMO-HOLDER FEED(1) PMO-HOLDER FEED(2) PMO-IDLE PICK_UP PMO-ROLL_FEED, DRV 12 RMO-RUBBER PICK_UP RMO-LEVER PICK_UP SPRING PICK UP(12) RING-CS
SEC CODE JC97-01324A * * * * * * * * * * * * * * * * * * * * * * * * * *
SA O X X X X X X X X X X X X X X X X X X X X X X X X X X
5-9 Cassette Unit Exploded view (270)
< Cassette Unit Parts List >

NO 18 19

DESCRIPTION MEA UNIT-FEEDER CAT 270 PMO-FRAME CASSETTE PMO-GUIDE INNER,CAST PMO-GUIDE CASSETTE P PMO-HOLDER INDICATOR PMO-INDICATOR EMPTY PMO-LOCKER PLATE SPRING LOCKER PLATE PMO-FRAME LEGAL LABEL(R)-PLATE PMO-REAR GUIDE CST IPR-GUIDE PAPER LABEL(R)-HEIGHT IPR-FINGER PMO-SIDE GUIDE SPRING-KNOCK UP IPR-NOCK UP PLATE PAD KNOCK UP GUIDE-PLATE SCREW
SEC CODE JC97-01467A * * * * * * * * * * * * * * * * * * *

QTY 1 3

SA O X X X X X X X X X X X X X X X X X X X

REMARK 270 SHEETS

Troubleshooting

4. Troubleshooting

4-1 How to use DCU 4-1-1 DCU Setup..Page(4-2) 4-1-2 Code..Page(4-2) 4-1-3 Self Diagnostic Mode..Page(4-3) 4-1-4 Self Test Button..Page(4-4) 4-1-5 Paper Path Layout..Page(4-4) 4-1-6 DCU Panel..Page(4-5) 4-2 The cause and solution of Bad image 4-2-1 Vertical Black Line and Band..Page(4-6) 4-2-2 Vertical White Line..Page(4-6) 4-2-3 Horizontal Black Band.Page(4-7) 4-2-4 Black/White Spot..Page(4-7) 4-2-5 Light Image..Page(4-8) 4-2-6 Dark Image or a Black.Page(4-8) 4-2-7 Uneven Density..Page(4-9) 4-2-8 Background..Page(4-9) 4-2-9 Ghost (1)..Page(4-10) 4-2-10 Ghost (2)..Page(4-10) 4-2-11 Ghost (3)..Page(4-11) 4-2-12 Ghost (4)...Page(4-11) 4-2-13 Satins on the Face of Page.Page(4-11) 4-2-14 Satins on Back of Page.Page(4-12) 4-2-15 Blank Page Print out (1)..Page(4-12) 4-2-16 Blank Page Print out (2)..Page(4-12) 4-6 The cause and solutions of bad environment of the software 4-6-1 The printer is not working (1).Page(4-26) 4-3 The cause and solution of the bad discharge 4-3-1 Wrong Print Position..Page(4-13) 4-3-2 JAM 0..Page(4-13) 4-3-3 JAM 1..Page(4-14) 4-3-4 JAM 2..Page(4-14) 4-3-5 Multi-Feeding..Page(4-15) 4-3-6 Paper rolled in the fuser..Page(4-15) 4-3-7 OPC..Page(4-16) 4-6-2 The printer is not working (2).Page(4-27) 4-6-3 Abnormal Printing..Page(4-28) 4-6-4 SPOOL Error..Page(4-29) 4-5 Toner Cartridge Service 4-5-1 Precautions on Safe-keeping of Toner Cartridge...Page(4-22) 4-5-2 Service for the Life of Toner Cartridge...Page(4-22) 4-5-3 Service for Judgement of Inferior Expendables and the Standard of Guarantee..Page(4-22) 4-5-4 Signs and Measures at Poor toner cartridge...Page(4-23) 4-4 The cause and solution of the malfunction 4-4-1 All LEDs blinking (Fuser Error).Page(4-17) 4-4-2 All LEDs blinking (SCAN ERROR).Page(4-17) 4-4-3 Not function of the gear of the fuser due to melting away..Page(4-18) 4-4-4 Paper Empty..Page(4-18) 4-4-5 Paper Empty without indication.Page(4-18) 4-4-6 Cover Open..Page(4-19) 4-4-7 No lamp on when the cover is open...Page(4-19) 4-4-8 Defective motor operation..Page(4-20) 4-4-9 No Power..Page(4-20) 4-4-10 Vertical Line Getting Curved.Page(4-21)

4-1 How to use DCU

4-1-1 DCU Setup
You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave the connect the harness wire(10 pin/4 pin) to the CN10(4 pin) of the Main control board.

4-1-2 Code

Connect DCU to the printer and turn the power on. It show 7 LED on the panel and each code tells the function of the printer.

Normal Code

While printing or warming up, it indicate the position of the paper 61 00-05 Warm up Ready(kind of paper) The printer is on, the cover is open or close. The printer is ready, the paper is detected when the first paper is printed. 00: Legal ,01: Letter ,02: A4 ,03: EXEC ,04: B5 ,05: Folio, 06: A5/A6 The engine controller received the print order from the video controller. 20: 1st, 21: MP, 22: SCF The paper is passing out of the Feed Sensor. The paper has passed out of the Feed Sensor. The paper has passed out of Exit Sensor. The fuser power turned off to minimize the power consumption.
20, 21, 22 Print Start Feed Sensor On Feed Sensor off Paper Out Sleep Mode

Error Code

When detecting the malfunction, the printing is stopped to indicate error code. 60, 62, 68 Fuser Error The error in the fuser occurred. There is a short circuit in the thermistor and the thermostat while printing, Low Temperature Error occurs. 60: Open Fuser Error 62: Low Heat Error 68: Over Heat Error The Printer Cover is open. The Toner Cartridge not installed, No paper in the paper cassette. The front part of paper is jammed between pickup unit and Feed sensor. The front part of paper is jammed between the Discharge sensor and Feed sensor. The front part of paper is jammed just after passing through the discharge sensor. The Out bin is filled with paper. LSU Scanner Motor not ready or Hsync signal not output.
Cover Open CRU Error No Paper Paper Jam 0 Paper Jam 1 Paper Jam 2 Out Bin Full LSU Not Ready
4-1-3 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.

Main Motor Operating System Only the main motor is in operation. Main High Voltage On(THV-) -1400 voltage output by MHV terminal. Transfer High Voltage(-)On(THV-) -1000 voltage output by MHV terminal. Transfer High Voltage (+)Reference on (THV +) +800 voltage output by MHV terminal. Caution : High voltage probe should be used. 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(-500V). Press the [Up] button to switch the voltage. The middle and right one of the three LEDs are on and -650 voltage output by DEV HV terminal. Caution : High voltage probe should be used. Caution : High voltage probe should be used. Caution : High voltage probe should be used.
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.
Pickup clutch on The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together. Paper Empty(1st, SCF, MF) Sensor Test : If activate the Actuator of the PEMPTY/PWIDTH Sensor, the left and right of the three LEDs are on. Paper Empty Sensor (1st) ON/OFF Paper Empty Sensor (SCF) ON/OFF Paper Empty Sensor (MP) ON/OFF Increment DCU Code No. (08, Sensor TEST) 1st LED ON/OFF 2nd LED ON/OFF 3rd LED ON/OFF
Feed & Exit Sensor Test Test the Feed sensor and Discharge sensor in the same way as '06'. Cover Open Sensor Test The same way as code '06'. Fuser Test If the [Enter] button pressed, the right LED is on and temperature of the fuser is up to READY Mode. If the [Up] button pressed, the middle LED is on and temperature of the fuser is up to Printing Mode. If you press the button once more, the left LED is on and temperature of the fuser is up to overheat Mode.
Hot Burn Test If the [enter] button pressed, the printer is continuously printing without detection. Turn the power off to stop operation.
Cleaning Mode Print Mode Print the paper to clean the OPC Drum in the Cartridge.
THV(+) TRIGGER. ALL HV : All high voltage output by each HV terminal and LSU and the fan is in operation. In this mode, electronic resistance of transfer roller and high voltage is detected.
+7P Clutch Test : Same method of the code 06. Fan Test : Indicates the function of the fan, same method of the code 06. Paper size Sensor Test : Cassette Sensor 1 ON/OFF Cassette Sensor 2 ON/OFF Cassette Sensor 3 ON/OFF Increment DCU Code No. (00,MAIN MOTOR TEST) Decrement DCU Code No. (15, FAN TEST) 1st LED ON/OFF 2nd LED ON/OFF 3rd LED ON/OFF

2. In case of 96 mm interval unremovable in 1, cleanly remove foreign substances stuck on the OPC location equivalent to black spots and white spots with a dry duster. 3. The transfer roller guarantees 125,000 sheets printing. If the roller's life is expired, replace it. 4. In case of 38.5 mm interval unremovable in 1, take measures as to replace the developer cartridge and try to print out. 5. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble.

4-2-5 Light Image

Description The printed image is light, with no ghost.
Check and Cause 1. Develop roller is stained when the toner of developer cartridge is almost consumed. 2. Ambient temperature is below than 10C.
Solution 1. Check if the Toner Save mode is off.
2. No 1 : Replace the developer cartridge and try to print out. 3. No 2 : Wait 30 minutes after printer is powered on before you start printing.
3. Bad contact caused by the toner stains between the high voltage terminal in the HVPS and the one in the set. 4. Abnormal output from the HVPS. (Run self-test and check 1~4)
4. No3 : Clean up the contaminated area by the toner.
5. Replace the HVPS if the problems are not solved by the above four directions.
4-2-6 Dark Image or a Black
Description The printed image is dark.
Check and Cause 1. No charge voltage in the engine board. ( Perform DCU diagnostic code 01) 2. Charge voltage is not turned on due to the bad contacts between power supply in the side of the Developer and charge terminal of HVPS.
Solution 1. Clean the high voltage charge terminal.
2. Check the state of the connector which connects the engine board and HVPS.
3. Replace the HVPS if not solved by the above direction 1 and 2.

4-2-7 Uneven Density

Description Print density is uneven between left and right.
Check and Cause 1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the transfer roller bushing or holder is damaged. 2. The life of the Developer has expired.

Solution 1. Replace both the left and right Spring Holder.
2. Occur in the developer cartridge, replace the developer and try to print out.
3. The toner level is not even on the developer roller due to the bad blade.

4-2-8 Background

Description Light dark background appears in whole area of the printing.
Check and Cause 1. Recycled recording paper has been used.
Solution 1. B/S is not guaranteed when using recycled paper.
2. The life of the Developer has expired.
2. Replace the Developer that has expired.
3. The up-to-down movement of the transfer roller is swift? 4. The HVPS is normal? (Perform DCU diagnostic code 01~04)
3. Clean the busing part of the transfer roller.
4. Replace the Developer if not solved by the above direction 1~3.

4-2-9 Ghost (1)

Description Ghost occurs at 96 mm intervals of the OPC drum in the whole printing.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause 1. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the electrode of the Developer. 2. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the one in the HVPS board. 3. The life of developer is expired.
Solution 1. Clean the terminals when contaminated by toner particles.

4-2-10 Ghost (2)

Description Ghost occurs at 96 mm intervals of the OPC drum in the whole printing. (When printing on card stock or transparencies using manual feeder) Check and Cause When printing on card stock thicker than normal paper or transparencies such as OHP, higher transfer voltage is required. Solution Select 'Thick Mode' on paper type menu from the software application and after using returning to the original mode is recommended.

96 mm 96 mm

3. Replace the engine board if not solved by the above directions 1-2.
4. Transfer roller lifetime(125,000 sheets) has expired.
4. If not solved by the direction 3, check the transfer roller lifetime and replace it.
5. Abnormal low temperature(below 10C).
5. Wait about 1 hour after power on before using printer. 6. Occur in the developer cartridge, replace the developer and try to print out.
6. Damaged cleaning blade in the developer.

4-2-11 Ghost (3)

Description White ghost occurs in the black image printing at 51mm intervals.

3. Replace the Main Control board or Cover Open S/W.

Hook Lever

4-4-7 No lamp on when the cover is open
Description The ERROR lamp does not come on even when the printer cover is open
Check and Cause 1. Check the connector(CN8) and circuit of the cover switch department in the Main Control board. Perform DCU mode : If Error state '64' occurs, Check the related codes of the Cover Open Error
Solution 1. Check the insertion of the Cover Open S/W Connect.
2. Replace the Main Control board or Cover Open S/W.
4-4-8 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 1. Motor harness or sub PCB may be defective.
Solution 1. Check the motor harness, replace it, if defective.
2. Perform DCU diagnostic code 00 and Check the motor operation.
2. Replace the SMPS, if necessary.

4-4-9 No Power

Description When system power is turned on, all lamps on the operator panel do not come on.
Check and Cause 1. Check if the power input and SMPS output are normal.
Solution 1. Replace the power supply cord or SMPS.
2. Check the inferiority of LED-Panel on the front-cover if the LED of Panel does not appear after normal warmingup.
2. Replace the control board.
3. Replace the LED-panel.
4-4-10 Vertical Line Getting Curved
Description When printing, vertical line gets curved.
Check and Cause 1. If the supply of +24v is unstable in the Main Control board linking with LSU, check drive by DCU Mode: LSU Check -05- LSU Motor on. 1. Replace LSU.
4-5 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.
4-5-1 Precautions on Safe-keeping of Toner Cartridge
Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.
4-5-2 Service for the Life of Toner Cartridge
If 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.

1. If light or dark periodical black dots occur, this is because the developer rollers are contaminated with foreign substance or paper particles. White spots occur in the image period- (1)38.5mm interval : Charged roller ically. (2)96mm interval : OPC cycle
2. If white spots occur in a black image at intervals of 96mm, or black spots occur elsewhere, the OPC drum is damaged or foreign substance is stuck to the surface.
3. If a black and white or graphic image is partially broken at irregular intervals, the transfer roller's life has been expired or the transfer voltage is abnormal. Recycled product Poor appearance of 1. Poor appearance of the develthe developer. oper. (1)Check the damage to label Unclean and rough and whether different materiprintouts. als are used. (2)Check the appearance of Bad background in parts of the developer, such the image. as frame, hopper.
1. In case of 1 (1)If there is an evidence of disassembling the developer. (2)If materials other than normal parts of the developer are added or substituted.
2. Unclean and rough printouts. (1)Check whether foreign substance or toner are stuck to the terminal (contact point) of the developer. (2)Check whether the state of the terminal assembly is normal.
2. In case of 2 - If there are any abnormals in connection with the situation of 1. (1)It occurs when the developer is recycled over 2 times. (2)If toner nearly being expired are collected to use, it is judged as the recycled developer.
Fault Ghost & Image Contamination
Signs The printed image is too light or dark, or partially contaminated black. Totally contaminatedblack. (Black image printed out) The density of printouts is too dark and ghost occurs.
Cause & Check 1. The printed image is too light or dark, or partially contaminated black. (1)Check whether foreign substance or toner are stuck to the terminal(point of contact) of the developer. (2)Check whether the terminal assembly is normal.
Solution 1. All of 1, 2, 3 above (1)Remove toner and foreign substances adhered to the contact point of the developer. (2)The contact point of the unit facing that of the developer also must be cleaned. (3)If the terminal assembly is unsafe: Fully stick the terminal to or reassemble it after disassembling. Disassemble the side plate and push the terminal to be stuck, then reassemble it. 2. In case of 2 It is a phenomenon when the OPC drum of the developer is not electrically charged. Clean the terminals of the charged roller, then recheck it.

4-6-2 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 1. Secure more space of the hard disk. Solution 1. Not working with the message 'insufficient printer memory' means hard disk space problem rather than the RAM problem. In this case, provide more space for the hard disk. Secure more space using the disk utilities program. 2. The connection of the cable and printer port is not proper. Check if the connection is properly done and if the parallel port in CMOS is rightly set up.
2. Printing error occurs even if there is enough space in the hard disk.
3. Check the parallel-port-related items in the CMOS Setup.
3. As a printer port, Select ECP or SPP among SPP(Normal), ECP, and EPP modes(increase printing speed) SPP normal mode support 8-bit data transfer, while ECP Mode transfer the 12-bit data.
4. Reboot the system to print.
4. If the regular font is not printing, the cable or the printer driver may be defective. Turn the PC and printer off, and reboot the system to print again. If not solved, double-click the printer in my computer If the regular fonts are not printed this time again. the cable must be defective so replace the cable with new one.

4-6-3 Abnormal Printing

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 defective or wrong setup in the CMOS Setup. Check and Cause 1. Set up the parallel port in the CMOS SETUP. Solution 1. Select SPP(Normal) or ECP LPT Port the among ECP, EPP or SPP in the CMOS Setup.

2. Printer Driver Error.

2. Check the printer in My Computer.(to see if the printer driver is compatible to the present driver or delete the old driver, if defective and reinstall the new driver)
3. Error message from insufficient memory. (The printing job sometimes stops or due to insufficient virtual memory, but it actually comes from the insufficient space of the hard disk.)

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 latch away from the part to which it is latched.

3-2 Transfer Roller

1. Open the printer cover. 3. Hold the cap at the both end of the roller, then remove the roller.

2. Remove the cap.

3-3 Controller Board
1. Remove two screws and remove the controller board. 2. Remove five screws securing the board and unplug all connectors, and then take the controller board out of the printer.

3-4 Pickup Assembly

1. Remove four screws securing the pickup assembly. 3. Check the pickup rubber wear. If the rubber is heavily worn, replace it with a new one.
Squeeze this tab to remove the rubber.
2. Take the assembly out.
Push the solenoid if you have difficulty to remove the pickup assembly.

3-5 Main Cover

1. Remove two screws and remove the controller board. 4. Remove two screws securing the main cover.
2. Remove two screws at the back of the printer and unplug one connector from the board, then open the rear cover.
5. Unlatch the front ends of the cover.
6. Slide the main cover upward, out of the printer.
3. Open the printer cover, and open the MP tray.
Note that the power switch and the power connecter are properly released when you remove the cover.
3-6 MP (Multi-Purpose) Tray
1. Before you remove the MP tray, you should remove: -Main Cover (see page 3-5)
2. Remove the stoppers securing the MP tray.

3-7 Exit Assembly

1. Before you remove the exit assembly, you should remove: -Main Cover (see page 3-5) 3. If you want to remove the roller shaft, unlatch both ends of the shaft and take it out
2. Remove the exit tray in the direction of arrow.
4. If you want to remove the exit roller, sqeeze the bottom of the roller and take it out.

3-8 LSU

1. Before you remove the LSU, you should remove: -Main Cover (see page 3-5) -Exit assembly (see page 3-7)
2. Remove four screws, and remove the LSU. Then unplug two connectors from the LSU.

3-9 HVPS Board

1. Before you remove the HVPS board, you should remove: -Main Cover (see page 3-5)
2. Remove four screws and take the HVPS board out.

3-10 Drive Assembly

1. Before you remove the drive assembly, you should remove: -Main Cover (see page 3-5) 4. Remove the motor assembly. Remove two screws securing the motor to the motor bracket, then take the motor out.
2. Remove six screws securing the drive assembly from the gear bracket and unplug one connector from the motor, and then take the drive assembly out.

The following tools are recommended for safe and smooth troubleshooting described in this service manual.
1 DCU(Diagnostic Control Unit)
Standard: Test equipment to diagnose the Laser printer supplied by Samsung Electronics.

Driver

Standard: "-" type, "+" type (M3 long, M3 short, M2 long, M2 short).
DVM(Digital Volt Meter) 6

Pinset

Standard: For general home use, small type.

Cotton Swab

Standard: For general home use, for medical service.
Standard: Indicates more than 3 digits.

Electronic Scale 8

Cleaning Equipments a IPA(Isopropyl Alcohol)dry cloth or a soft stuff neutral detergent.
Software(Driver) installation CD ROM
Standard: Equipment to check the weight of consumables(toner cartridge) supplied by Samsung Electronics. (The gram unit can be measured.)
Mind your hands not to be touched when you disassemble and reassemble PBA ASS'Y, such as the main board, SMPS, HVPS.

LASER PRINTER ML-1650Series

ML-1650 / ML-1651N

SERVICE

LASER PRINTER

Manual

CONTENTS

1. Precautions 2. Specifications 3. Disassembly and Reassembly 4. Troubleshooting 5. Exploded Views and Parts List 6. Block Diagram 7. Connection Diagram
This service manual is also provided on the web, the ITSELF system f Samsung Electronics Co., Ltd. http://itself.sec.samsung.co.kr
Samsung Electronics Co.,Ltd. September 2001 Printed in Korea. VERSION NO. : 2.00 CODE : JC-0055A
This manual is stated and provided for service description.
All rights reserved. Any parts of the information in this manual are prohibited from free duplication, use or translation without prior written approval except in cases allowed by the Copyright Act. Specifications are subject to change without prior notice.
Samsung Electronics Digital Printing CS Group

Copyright (c) 2001. 6.

Precautions

1. Precautions

Please read the following carefully to prevent any accidents and not to damage the unit during service.

1-1 Safety Precautions

Read each caution carefully: 1. Do not use this printer near water or when exposed to inclement weather. 2. Do not place this printer on an unstable cart, stand or table; the product may fall, causing serious damage to the product. 3. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation and to protect the printer from ever heating, do not block or cover any of these openings. Do not place the printer in an enclosure unless the enclosure provides adequate ventilation. 4. Never push objects of any kind into the printer through the cabinet ventilation slots as they may touch dangerous high voltage points, create short circuits, cause a fire, or produce an electrical shock. Never spill liquid of any kind on the printer. 5. Do not place the printer in a location where someone may trip on the cords. 6. Select a work surface that is large enough to hold the printer. 7. Position the printer within six feet of the computer and within five feet of an electrical outlet. 8. Operate this printer using the power source (110V, 220V, etc) indicated on the marking label. If you are not sure of the type of power source available, consult your dealer or local power company. 9. If you need to use an extension power cord with this printer, make sure that it uses a three-wire grounded cord and that the total ampere ratings for all of the products using the extension do not exceed the extension cord ampere rating. Also, make sure that the total of all products plugged into the wall outlet does not exceed 15 amperes. 10. Do not allow anything to rest on the power cord or data communications cable. 11. Unplug this printer from the wall outlet before cleaning. Do not use liquid cleaners or aerosol sprays. Use a damp cloth for cleaning. 12. Do not touch the surface of the photo-sensitive drum as marks or scratches may impair print quality. 13. Do not expose the drum unit to direct light for prolonged periods. 14. Use only standard papers, OHP films, and approved envelopes. Feed OHP films though the manual feed slot only. See specifications for approved papers and envelopes. 15. Other than replacing consumables such as paper and toner, refer all questions to qualified service personnel.

Samsung Electronics

Especially mind the safety on the part with this mark. You must use regular parts described in specifications for the parts inflammable and where the current can be flown. Otherwise any hazard such as an electric shock or a fire could occur.
LASER STATEMENT (LASERTURVALLISUUS)
WARNING : NEVER OPERATE AND SERVICE THE PRINTER WITH THE PROTECTIVE COVER REMOVED FROM LASER/SCANNER ASSEMBLY. THE REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN DAMAGE YOUR EYES.
Class 1 laser product Luokan 1 laserlaite Klass 1 laser apparat Allonpituus 770-795nm Teho 0.3mW0.03mW

CAUTION VORSICHT

INVISIBLE LASER RADIATION WHEN THIS COVER OPEN. DO NOT OPEN THIS COVER. UNSICHTBARE LASERSTRAHLUNG, WENN ABDECKUNG GEOFFNET. NIGHT DEM STRAHL AUSSETZEN.

ATTENTION

REYONNEMENT LASER INVISIBLE EN CAS DOUVERTURE. EXPOSITION DANGERUSE AU FAISCEAU. APERTURA. EVITARE LESPOSIZONE LA FASCIO.

ATTENZIONE RADIAZIONE LASER INVISIBLE IN CASO DI PRECAUCION REDIACION LASER INVISIBLE CUANDO SE
ABRE. EVITAR EXPONERSE AL RAYO.
CAUTION : Avoid exposure to invisible laser radiation when the
development unit is not installed.
1-2 Precautions on Disassembly and Reassembly
Very careful precautions should be taken when replacing parts. Before replacing, please check cables because you cannot put the cables that you removed for replacing parts into the proper place if you would not make sure of where they were connected and in which condition. Please do the following before disassembling for a repair or replacement of parts. 7. When disassembling, assembling, also observe small components are located in place. 8. If you uncover and turn the machine over to replace some parts, toner or paper particles may contaminate the LSU window. Protect the LSU window with clean paper.
Releasing Plastic Latches
1. Pull out paper cassette, printer cartridge installed. Especially careful not to be scratched by the surface of developer or not to expose them to light. 2. Turn the power switch off. 3. Take out the power plug, printer cable from the printer. 4. Use only the same type of part as original when replacing parts. 5. Do not force to open or fasten plastic material components. 6. Be careful that small parts such as screws should not get in the printer. Many of 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 latch away from the part to which it is latched.
1-3 Tools for Troubleshooting
The following tools are recommended for safe and smooth troubleshooting described in this service manual.
1 DCU(Diagnostic Control Unit)
Standard: Test equipment to diagnose the Laser printer supplied by Samsung Electronics.

4 Driver

Standard: "-" type, "+" type (M3 long, M3 short, M2 long, M2 short).

5 Pinset 2

Standard: For general home use, small type.

DVM(Digital Volt Meter)

Standard: Indicates more than 3 digits.

6 Cotton Swab

Standard: For general home use, for medical service.

Ground

IPA(Isopropyl 7 Cleaning Equipmentsa asoft stuff neutral Alcohol)dry cloth or detergent.

Network

Network Protocols Supported
TCP/IP : Windows 95/98, Windows NT, UNIX IPX/SPX : Windows 95/98, Novell Netware DLC/LLC : Windows 95/98, Windows NT Ethertalk : Apple Talk SNMP : for Network Printer Administration
Network Card Interface Network Management S/W
Ethernet 10/100 BaseTX (Auto Negotiation) Samsungs Admin. Software Utility (SyncThru) SNMP and MIB-II Support, GUI based utility for Windows Systems and Test based utility for UNIX Systems HTTP server for web browser based network management (can manage NPC and printer options on Web Browser)
Disassembly and Reassembly
3. Disassembly and Reassembly
3-1 General Precautions on Disassembly
When you disassemble and reassemble components, you must use extreme caution. The close proximity of cables to 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 their original positions. Before removing any component from the machine, note the cable routing that will be affected.
Whenever servicing the machine, you must perform as follows: 1. Remove the paper cassette(s), and the print cartridge. Do not expose the cartridge to direct room light or sun light, and be careful not to scratch the drum surface. 2. Turn the power switch off. 3. Unplug all the cables from the printer. 4. Replace with only an authorized component. 5. Do not force to open or fasten a plastic material component. 6. Be careful no obstacles are included when you reassemble components. 7. When you reassemble components, be careful small size components are located in place. 8. If you turn the machine over to replace some parts, toner or paper particles may contaminate the LSU window. Protect the LSU window with clean paper.
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 latch away from the part to which it is latched.

3-2 Transfer Roller

1. Open the printer cover. 3. Hold the cap at the both end of the roller, then remove the roller.

2. Remove the cap.

3-3 Controller Board
1. Remove two screws and remove the controller cover. 2. Remove five screws securing the board and unplug all connectors, and then take the controller board out of the printer.

3-4 Pickup Assembly

1. Turn the printer upside down. Remove four screws, then remove the bar cross bottom. 4. Take the assembly out.

5. Unplug all connectors from the PCU shield, and remove the shield.
To replace the exit board : Unplug one connector from the controller board and remove one screw securing the board. Then release the wire from two holders and take the board out.
To replace the Cap sensor : Remove two screws and take it out.
To replace the fuser sensor : Remove two screws and take it out.
To replace the actuator empty : Take the sensor out while you squeeze the both ends of the sensor.
To replace the actuator feed 1. Turn the mechanism back and push down the points as shown to unlatch the actuator feed.
To remove the transfer guide : Remove three screws and take the guide out.
2. Turn the unit over again, and remove the actuator feed.

Troubleshooting

4. Troubleshooting
4-1 How to use DCU 4-1-1 DCU Setup..Page(4-2) 4-1-2 Code..Page(4-2) 4-1-3 Self Diagnostic Mode..Page(4-3) 4-1-4 Self Test Button..Page(4-4) 4-1-5 Paper Path Layout..Page(4-4) 4-1-6 DCU Panel..Page(4-5) 4-2 The cause and solution of Bad image 4-2-1 Vertical Black Line and Band..Page(4-6) 4-2-2 Vertical White Line..Page(4-6) 4-2-3 Horizontal Black Band.Page(4-7) 4-2-4 Black/White Spot..Page(4-7) 4-2-5 Light Image..Page(4-8) 4-2-6 Dark Image or a Black.Page(4-8) 4-2-7 Uneven Density..Page(4-9) 4-2-8 Background..Page(4-9) 4-2-9 Ghost (1)..Page(4-10) 4-2-10 Ghost (2)..Page(4-10) 4-2-11 Ghost (3)..Page(4-11) 4-2-12 Ghost (4)...Page(4-11) 4-2-13 Satins on the Face of Page.Page(4-11) 4-2-14 Satins on Back of Page.Page(4-12) 4-2-15 Blank Page Print out (1)..Page(4-12) 4-2-16 Blank Page Print out (2)..Page(4-12) 4-6 The cause and solutions of bad environment of the software 4-6-1 The printer is not working (1).Page(4-26) 4-3 The cause and solution of the bad discharge 4-3-1 Wrong Print Position..Page(4-13) 4-3-2 JAM 0..Page(4-13) 4-3-3 JAM 1..Page(4-14) 4-3-4 JAM 2..Page(4-14) 4-3-5 Multi-Feeding..Page(4-15) 4-3-6 Paper rolled in the fuser..Page(4-15) 4-3-7 OPC..Page(4-16) 4-6-2 The printer is not working (2).Page(4-27) 4-6-3 Abnormal Printing..Page(4-28) 4-6-4 SPOOL Error..Page(4-29) 4-5 Toner Cartridge Service 4-5-1 Precautions on Safe-keeping of Toner Cartridge...Page(4-22) 4-5-2 Service for the Life of Toner Cartridge...Page(4-22) 4-5-3 Service for Judgement of Inferior Expendables and the Standard of Guarantee..Page(4-22) 4-5-4 Signs and Measures at Poor toner cartridge...Page(4-23) 4-4 The cause and solution of the malfunction 4-4-1 All LEDs blinking (Fuser Error).Page(4-17) 4-4-2 All LEDs blinking (SCAN ERROR).Page(4-17) 4-4-3 Not function of the gear of the fuser due to melting away..Page(4-18) 4-4-4 Paper Empty..Page(4-18) 4-4-5 Paper Empty without indication.Page(4-18) 4-4-6 Cover Open..Page(4-19) 4-4-7 No lamp on when the cover is open...Page(4-19) 4-4-8 Defective motor operation..Page(4-20) 4-4-9 No Power..Page(4-20) 4-4-10 Vertical Line Getting Curved.Page(4-21)

4-1-4 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 begins printing(trial printing and data from the PC). It is convenient to use this mode when the engine malfunction is detected in the control board.

4-1-5 Paper Path Layout

OUT BIN FULL SEN

FACE DOWN

FACE UP

CARTRIDGE

FEED SEN

EXIT SEN

PICK UP

EMPTY SEN

CASSETTE

4-1-6 DCU Panel

ML-1650 DIAGNOSTIC CONTROL UNIT QUICK REFERANCE
04 BIAS LSU READY 08 CRU BIAS 1 LSU MT&LD EXIT SENSOR PRINT HEAT BIAS 0 LSU MOTOR MP FEED SENSOR STANDBY HEAT

07 PAPER EMPTY SCF

SELF TEST

STATUS DIAGNOSTIC

09 COVER OPEN COVER COVER OUT BIN 10 COER HEAT

DIAGNOSTIC CODE

MAIN MOTOR OPERATION MAIN HIGH VOLTAGE ON TRNSFER HIGH VOLTAGE (-)ON THV(+) REFERANCE VOLTAGE DEV/SUPPLY VOLTAGE ON LSU OPERATING TEST PICKUP CLUTC ON PAPER EMPTY SENSOR TEST FEED & EXIT SENSOR TEST COVER OPEN SENSOR TEST FUSER TEST HOT BURN TEST CLEAN (MESSAGE)PRINT THV(+)TRIGGER &THV ON MP PICKUP ON FAN TEST PAPER SIZE SENSOR TEST SMD TEST

STATUS CODE

READY (REGAL) READY (LETTER) READY (A4) READY (EXECUTIVE) READY (B5) READY (FOLIO) READY (A5,A6) PRINT START (1'st CASSETTE) PRINT START (MP) PRINT START (2'nd CASSETTE) FEED SENSOR 2'st ON PAPER OUT
60 OPEN FUSER ERROR 62 LOW HEAT ERROR 68 OVERHEAT ERROR 76 90
WARM UP COVER OPEN ERROR CRU ERROR SLEEP MODE NO PAPERR or CASSETTE PAPER JAM 0 PAPER JAM 1 PAPER JAM 2 OUTBIN FULL ERROR MANUAL PRINT MODE

GREEN STATUS CODE

95 LSU NOT READY

DCU MODE!! !!!

DOWN!! UP!!!!

SHIFT!!

STOP ENTER
O ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL THE PRINTER POWER ON.
4-2 The cause and solution of Bad image
4-2-1 Vertical Black Line and Band
Description 1. Straight thin black vertical line occurs in the printing. 2. Dark black vertical band occur in the printing. Check and Cause 1. Damaged develop roller in the Developer. Deformed Doctor-blade or cleaningblade. Solution 1. If causes 1 and 2 occur in the developer cartridge, replace the developer and try to print out.

Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
2. Scratched surface of the discharge roller in the developer. 3. Partly depression or deformation on the surface of the transfer roller.
2. Replace the transfer roller if occurred as No. 3.
4-2-2 Vertical White Line
Description White vertical voids in the image.
Check and Cause 1. Foreign matter stuck onto the window of internal lenses of LSU mirror.
Solution 1. Foreign matter stuck onto the window : Clean the LSU window with recommended cleaner(IPA) Clean the window with a clean cotton swab. 2. Foreign matter in the LSU : Open the cover of LSU and clean with a cotton swab on the surface of the reflex mirror.
2. Foreign matter or toner particles between the developer roller and blade. (In case the life of the developer has been expired, white lines or light image occur in front of the image.) 3. It may occur when Burr and foreign substances are on the window of the developer frame. 4. If the fuser is defective, voids occur periodically at the top of a black image.
3. No 3. : Remove the foreign matter and burr of the exposure window. (Developer cartridge) 4. No. 4. : Open the front cover and check ribs that corresponds to the position of the voids. Remove if found. 5. If the problems are not solved, replace the developer cartridge.
4-2-3 Horizontal Black Band
Description 1. Dark or blurry horizontal stripes occur in the printing periodically. (They may not occur periodically.) Check and Cause 1. Bad contacts of the voltage terminals to developer. Solution 1. Clean each voltage terminal of the Charge, Supply, Develop and Transfer roller. (remove the toner particles and paper particles) 2. Clean the right Gear that has relatively small gap of the teeth in the OPC.
2. The rollers of developer may be stained. Charge roller = 38.5mm Supply roller = 51mm Develop roller = 50mm Transfer roller = 56.8mm
3. If the malfunction persists, replace the developer.

4-2-4 Black/White Spot

Description 1. Dark or blurry black spots occur periodically in the printing. 2. White spots occur periodically in the printing. Check and Cause 1. If dark or blurry black spots occur periodically, the rollers in the Developer may be contaminated with foreign matte or paper particles. ( Charge roller : 38.5 mm interval OPC drum : 96 mm interval) 2. If faded areas or voids occur in a black image at intervals of 96 mm, or black spots occur elsewhere, the OPC drum surface is damaged. 3. If a black image is partially broken, the transfer voltage is abnormal or the transfer roller's life has expired. Solution 1. Run OPC cleaning Mode Print and run the Self-test 2 or 3 times.
2. In case of 96 mm interval unremovable in 1, cleanly remove foreign substances stuck on the OPC location equivalent to black spots and white spots with a dry duster. 3. The transfer roller guarantees 125,000 sheets printing. If the roller's life is expired, replace it. 4. In case of 38.5 mm interval unremovable in 1, take measures as to replace the developer cartridge and try to print out. 5. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble.

4-2-5 Light Image

Description The printed image is light, with no ghost.
Check and Cause 1. Develop roller is stained when the toner of developer cartridge is almost consumed. 2. Ambient temperature is below than 10C.
Solution 1. Check if the Toner Save mode is off.
2. No 1 : Replace the developer cartridge and try to print out. 3. No 2 : Wait 30 minutes after printer is powered on before you start printing.
3. Bad contact caused by the toner stains between the high voltage terminal in the HVPS and the one in the set. 4. Abnormal output from the HVPS. (Run self-test and check 1~4)
4. No3 : Clean up the contaminated area by the toner.
5. Replace the HVPS if the problems are not solved by the above four directions.
4-2-6 Dark Image or a Black
Description The printed image is dark.
Check and Cause 1. No charge voltage in the engine board. ( Perform DCU diagnostic code 01) 2. Charge voltage is not turned on due to the bad contacts between power supply in the side of the Developer and charge terminal of HVPS.
Solution 1. Clean the high voltage charge terminal.
2. Check the state of the connector which connects the engine board and HVPS.
3. Replace the HVPS if not solved by the above direction 1 and 2.

4-2-7 Uneven Density

Description Print density is uneven between left and right.
Check and Cause 1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the transfer roller bushing or holder is damaged. 2. The life of the Developer has expired.
Solution 1. Replace both the left and right Spring Holder.
2. Occur in the developer cartridge, replace the developer and try to print out.
3. The toner level is not even on the developer roller due to the bad blade.

4-2-8 Background

Description Light dark background appears in whole area of the printing.
Check and Cause 1. Recycled recording paper has been used.
Solution 1. B/S is not guaranteed when using recycled paper.
2. The life of the Developer has expired.
2. Replace the Developer that has expired.
3. The up-to-down movement of the transfer roller is swift? 4. The HVPS is normal? (Perform DCU diagnostic code 01~04)
3. Clean the busing part of the transfer roller.
4. Replace the Developer if not solved by the above direction 1~3.

4-2-9 Ghost (1)

Description Ghost occurs at 96 mm intervals of the OPC drum in the whole printing.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause 1. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the electrode of the Developer. 2. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the one in the HVPS board. 3. The life of developer is expired.

2. Check if the PC and the printer is properly connected and the toner cartridge installed.
3. Printing is nor working in the Windows.
4. Check if the printer cable is directly connected to peripheral devices
4. If the scanner needs to be connected to the printer, first the remove the scanner from the PC to see if the printer is properly working alone.
4-6-2 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 1. Secure more space of the hard disk. Solution 1. Not working with the message 'insufficient printer memory' means hard disk space problem rather than the RAM problem. In this case, provide more space for the hard disk. Secure more space using the disk utilities program. 2. The connection of the cable and printer port is not proper. Check if the connection is properly done and if the parallel port in CMOS is rightly set up.
2. Printing error occurs even if there is enough space in the hard disk.
3. Check the parallel-port-related items in the CMOS Setup.
3. As a printer port, Select ECP or SPP among SPP(Normal), ECP, and EPP modes(increase printing speed) SPP normal mode support 8-bit data transfer, while ECP Mode transfer the 12-bit data.
4. Reboot the system to print.
4. If the regular font is not printing, the cable or the printer driver may be defective. Turn the PC and printer off, and reboot the system to print again. If not solved, double-click the printer in my computer If the regular fonts are not printed this time again. the cable must be defective so replace the cable with new one.

4-6-3 Abnormal Printing

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 defective or wrong setup in the CMOS Setup. Check and Cause 1. Set up the parallel port in the CMOS SETUP. Solution 1. Select SPP(Normal) or ECP LPT Port the among ECP, EPP or SPP in the CMOS Setup.

Way to observe Part Code & Description
Part code and Description is quoted and controlled by determined standard. Refer to this determined standard, it will help with ordering Part.
There ar woo kinds of Part code inscription type.
ex ) 2007-007961 ex ) JB96-01268A R-CHIP ELA UNIT-COVER TOP
Type 1 : Controlled by Company : It can be commonly used for all kinds of product SEC produce. Mostly, electronics Parts. Type 2 : Controlled by Division : It is used or one produce. Mostly, Mostly, mechanical Parts.
A/S privately used part : It is only used for A/S. Assy part : Assembled by more than 2 Parts. If necessary part is not A/S Part, Assy part including
necessary par can be used. It is shown in the diagram and drawing of SVC manual. Assy part and A/S privately used Part is distinguished by part Code and Description. The are inscription type 2. It is recognized by Part character and front side of description. DIVISION A/S Private ASSY Part ASSY Part ASSY Part PART CODE **81-****** (JB81-00039A) **75-****** (JB75-00068A) **92-****** (JB92-01131A) **97-****** (JB97-01089A) DESCRIPTION AS-***** (AS-USE) MEC-***** (MEC-CHUTE) PBA ****** (PBA MAIN-CONTROLLER) MEA ****** (MEA UNIT-PULLEY IDLE)
5-1 Exploded Views and Parts List

Service Parts List

NO. 1 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9 1-10 DESCRIPTION ELA HOU-HOUSING HAWK16 PMO-COVER OPEN PMO-COVER MAIN PMO-STOPPER HINGE OPEN PMO-LENS LED PMO-KEY BUTTON PBA SUB-PANEL_SEC PMO-COVER REAR PMO-STACKER REAR PMO-COVER CONTROLLER MEA UNIT-MP TRAY SEC CODE refer to the table JC72-00628A refer to the table JC72-00482A JC72-00365A JC72-00499A JC92-01208D JC72-00355A JC72-00356A JC72-00358A JC97-01325A JC72-00349A JC72-00350A JC97-01315C JC61-40001A JC97-01316A JC61-40001A JC59-00013A JC96-02057A JC31-00002A JC31-00009A * JC96-01650A 0604-001095 JC33-00003A JC73-10907A JC97-01466C JC39-00157A JC97-01324B JC73-40907A JC72-00320A JC96-02113A JC96-02114A JC70-00080A JC72-00334A JC92-01302A QTY SA O O O O O O O O O O O O O O O O O O O O O X O O O O O 550SHEETS O O O O O O O O O 110V/220V 110V 220V REMARK NO. 10-14 14-1 14-2 14-3 14-4 14-5 14-6 14-7 14-8 14-9 DESCRIPTION SMPS-HAWK16 SMPS PWB SMPS V2 (220V) FAN-DC PMO-CAP WIRE IPR-CLAMP EMI

1-12-1

5 5-2 5-5-1 7

14-1 14-2 14-3 14-4 14-7 14-8 14-6 14-9

8-8 18

10-3 10-4 10-2 10-1 10

14-13 14-11 14-10 14-12

22 Samsung Electronics
5-2 All Exploded Views and Parts List
5-2-1 Cover Exploded View
NO. 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9 1-10 1-11 1-12 1-13 Description ELA HOU-COVER MAIN Qty 2 7
PMO-COVER OPEN PMO-COVER MAIN STOPPER HINGE OPEN PMO-LENS LED PMO-KEY BUTTON PBA PANEL PMO-COVER REAR PMO-STACKER REAR IPR-SPRING LOCKER REAR PMO-CAP REAR PMO-SUPPORT MP TRAY PMO-LEVER_EMPTY, MP PMO-STOPPER_EXIT,P 2 PMO COVER CONTROLLER 3 MEA UNIT-MP TRAY 3-1 PMO-COVER-MP 3-2 MPR-NAME PLATE XRX 3-3 PMO-CHUTE 3-3-1 PMO-DUMMY CHUTE 3-4 PMO-TRAY HOLDER MP 3-5 IPR-GUIDE LATCH 3-6 PMO-SIDE GUIDE MP 3-7 PMO-TRAY LINK MP 4 MEA UNIT-BRKT BOTTOM(L) XRX 4-1 FOOT-RUBBER 4-2 PMO-BRKT BASE L 4-3 PAPER SIZE SENSOR ASSY 5 MEA UNIT-BRKT BOTTOM(R) XRX 5-1 FOOT-RUBBER 5-2 IPR-PLATE CST GUIDE 5-3 PMO-BRKT BASE R 5-4 SCREW-TAPTITE 5-5 IPR-GROUND SCF BASE 6 IPR-BAR CLOSS BOTTOM S1 SCREW-TAPTITE
1-8 1-2 1-9 1-10 1-3 1-4 1-12 1-5 1-6 1-3-7 3-3

4-2 4-3 5-4 5-5

3-4 3-6

5-2 4-1

3-1 3-2

5-3 5-1

5-2-2 Frame Exploded View
NO. 15 15-1 15-2 15-16-1 16-2 16-3 16-18 18-1 18-19-1 19-22-1 22-2 22-24 24-1 24-25-1 25-28-1 28-2 28-29-1 29-2 29-3 29-30-1 30-2 30-31-1 31-2 31-32-1 32-Description ELA UNIT-FRAME BASE PMO-GUIDE RIB CBF HARNESS-INLET ASSY PMO-HOLDER WIRE KEY DEVE CBF HARNESS-ENGINE_CONTROL CBF-HARNESS_FUSER PBA-EXIT SENSOR CBF-HARNESS-THERMISTOR JOINT CBF-HARNESS-MP_CLUTCH ENG PBA SUB-FUSER SW PBA SUB-TONER SENSOR PMO-FRAME COVER IPR-TERMINAL FU ELA UNIT-HOLDER TR L PMO-BUSHING TR SPRING TR L PMO-TRANSFER HOLDER ELA UNIT-HOLDER TR R PMO-BUSHING TR SPRING TR R PMO-TRANSFER HOLDER IPR-PLATE TR GEAR-TR29 ELA UNIT-GUIDE DEVE L PMO-GUIDE DEVE L SPRING GUIDE DEVE ELA UNIT-GUIDE DEVE R PMO-GUIDE DEVE R SPRING GUIDE DEVE ELA HOU-VARISTOR IPR-TERMINAL TR, HAWK ELA UNIT-SENSOR DEVE PBA -MICROSWITCH PMO-HOLDER ACTUATOR PMO-ACTUATOR DEVE GROUND FU ELA UNIT-TERMINAL TR L ICT-SHAFT HV LARGE SPRING-HV LARGE ELA UNIT-TERMINAL TR S ICT-SHAFT HV LARGE SPRING-HV SMALL GROUND-HVPS IPR-REMOVE KEY ELA UNIT-ACTUATOR FEED PMO-ACTUATOR FEED PMO-HOLDER ACTUATOR SPRING-FEED HAWK 14 ELA UNIT-GUIDE TRANSFER PMO-HADER SAW PLATE IPR-PLATE SAW IPR-GUIDE TRANSFER PMO-GUIDE RIB TR ELA UNIT-GUIDE FEED PMO-GUIDE OPTIC GUIDE FEED PMO-HOLDER G/PAPER ELA UNIT-PTL GUIDE PLATE FEED PMO-HOLDER PTL PBA SUB-PTL ELA UNIT-EMPTY ACT PMO-ACTUATOR EMPTY HAWK SPRING EMPTY HINGE GUIDE FEED GND ICU PMO-CAP SENSOR GND MP GEAR-P/UP DRIVE GROUND MOTOR IPR-GUIDE DUST PBA MAIN-CON_JOINT IPR-OPC-HAWK CAP CONNECTOR L CAP CONNECTOR U MEC-ROLLER TRANSFER GEAR IDLE Z27 RING-CS WASHER-PLAIN IPR-WASHER SPRING SU SPRING HINGE FEED GEAR-EXIT M ID IPR-GUIDE, DUST PMO-BASE, FRAME PMO-GUIDE-SKEW(12) Qty 1 1

15-1 15-2 15-3

16-1 16-2 16-3 16-4

18-2 18-1

19-1 19-2

30-1 30-2

25-2 24-1

32-2 28-3 28-2 28-1 32-1

31-1 31-2

29-3 29-1

29-2 29-4

5-2-3 Exit Exploded View

NO. Description MEA RACK-HOU EXIT PMO-FRAME REAR GEAR-EXIT/U, ID RING-CS GEAR-IDLE 25 SPRING-F/DOWN PMO-HOLDER EXIT_F/DOWN PMO-ROLLER-EXIT, MAIN PMO-ROLLER-EXIT, FR MEC-BEARING, EXIT RING-C MEA UNIT-ROLL EXIT GEAR-EXIT RMP-RUBBER EXIT_F/UP ACTUATOR OUT-FULL MEC-BEARING, EXIT RING-C GUIDE EXIT SCREW TAPTITE PHOTO SENSOR OUT BIN PMO-HOLDER LEVER PMO-LEVER STACKING Qty 2 2
5-2-4 Rack-MPF Exploded View
NO. 26 Description ELA HOU-MPF PHOTO-INTERRUPTER SCREW-TAPTITE WASHER-PLAIN SOLENOID-HAWK CBF-HARNESS-MP_EMPTY SPRING KNOCK UP SPRING-PICK UP, MP BRACKET_MP PMO-PLT KNOCK_UP, MP ICT-SHAFT_P/U, MP PMO-GEAR P/U MP PMO-CAM PICK UP MP PMO-FRAME_MP PMO-HOLDER_P/U,MP PMO-HOUSING_P/U, MP PMO-BEARING-PICK UP RPR-RUBBER P/UP, MP PMO-IDLE PICK UP, MP RPR-PAD KNOCKUP, MP RCR-FRICTION PAD 1 MP RCR-FRICTION PAD 2 MP PMO-RING KNOCK UP MP SCREW TAPTITE PMO-ADJUST END MP RING-E RING-CS Qty 1
5-2-5 Fuser Exploded View
NO. 38 Description ELA UNIT FUSER (110V) ELA UNIT FUSER (220V) SCREW TAPTITE M3 x 8, BH+ SCREW TAPTITE M3 x 10, FH+ SCREW MACHINE M3 x 6 THERMISTOR-NTC ELECTRODE FU R ELECTRODE FU M ELECTRODE FU L THERMOSTAT BRKT GEAR FUSER GEAR-IDLE 25 GEAR-IDLE 15 RING-CS COVER FUSER ROLLER EXIT_F/UP EXIT_F/UP (SPRING) SPRING-CLAW GUIDE-CLAW LAMP-HALOGEN(110V) LAMP-HALOGEN(220V) ROLLER-HEAT ROLLER PRESSURE FRAME FUSER GUIDE INPUT GEAR FUSER, 32 BUSHING HR-L BUSHING HR-R SPRING-BEARING PR BUSHING PR PMO GUIDE REAR SHAFT EXIT_F/UP BUSHING_TX GEAR-EXIT RUBBER EXIT RUBBER EXIT F/UP ACTUATOR EXIT SPRING-ACTUATOR HOLDER BRUSH BRUSH ANTISTATIC HOLDER SHAFT Qty 1
5-2-6 Drive Exploded View
NO. Description ELA UNIT-MOTOR MOTOR-STEP 7.5_DEG MOTOR-STEP 7.5_DEG IPR-BRKT GEAR IPR-BRKT MOTOR GEAR-FUSER DRV GEAR-RDCN 123-87 GEAR-OPC DRV 135 GEAR-OPC DRIVE2 WASHER-PLAIN GEAR-FEED DRV SCREW-MACHINE MPR-POLYWASHER8 WASER-PLAIN Qty 1 1
5-2-7 Pick-Up Exploded View
NO. 26 Description MEA UNIT-FEEDER SCREW-TAPTITE WASHER-PLAIN SPRING-FEED(1) SPRING-FEED(2) BEARING-PICK UP GEAR-P/UP DRIVE GEAR-FEED GEAR-PICK UP(12) IPR-SHAFT FEED IPR-SHAFT FEED IDLER IPR-SHAFT PICK UP GROUND_FEED IPR-GUIDE_FEED, 16 PMO-HOUSING P/UP PMO-ROLLER FEED L PMO-ROLLER FEED S PMO-SUB HOLDER FEED PMO-FRAME_FEED PMO-HOLDER FEED(1) PMO-HOLDER FEED(2) PMO-IDLE PICK_UP PMO-ROLL_FEED, DRV 12 RMO-RUBBER PICK_UP RMO-LEVER PICK_UP SPRING PICK UP(12) RING-CS Qty 1
5-2-8 Cassette Exploded View
NO. Description MEA UNIT FEEDER CST (500) PMO-COVER GUIDE EXT PMO-FRAME CASSETTE PMO-GUIDE EXT CST PMO-GUIDE PAPER PMO-GUIDE SIDE CST PMO-INDICATOR EMPTY PMO-SIDE GUIDE EXT PMO-SUB GUIDE CAST PMO-HOLDER_INDICATOR PMO-LOCKER PLATE IPR-FINGER IPR-GUIDE EXT LOCK IPR-GUIDE PAPER SCF IPR-GUIDE PLT PAPER IPR-PLATE KNOCK UP IPR-PLATE SPR LOCK IPR-SPR PLT G/SIDE SPRING PLATE K/UP 1 SPRING PLATE K/UP 2 SPRING LOCKER,PLATE RPR-PAD CST PMO GUIDE PAPER SIZE SCREW TAPTITE M3 x 10 NI LABEL(R)-CASSETTE GUIDE PAPER DUMMY Qty 1 1

6. Block Diagram

6-1 Video ControllerBlock Diagram

100PIN DIM M 29LV 160

16Mbit Flash Memory 21

DAT A(0:31)

ADD R(2:22) ADD R( 0:31)

DATA(0:31)

29LV 160
16Mbit Flash Memory Mask Font ROM K3P5V 1000D-GC, High Mask Font ROM K3P5V 1000D-GC,L ow RD_FL A SH* W R_FL A SH1,2,TS* TT1, nTSB T,TSIZ(0:2) , nTA, RST* I NT* nTS, nBG , , 4 SYSCL K 22

Regulator 2.7V

CPU POWER PC PPC603ei 166M Hz

3 RCS(0:3) 4 2

nW R F_W R_E Frequency Scaling EMI Attenuator
System clock 11.1M Hz(OSC)

Memory Data Bus

nFSYNC VCL K *

V ideo-Clock

61.23307M Hz

SDRA M

100PIN DIMM 64M bi t SDRAM K4S641632C 64M bi t SD RAM K4S641632C

32 DRA MD(0:3 1)

A DDR(2:18) 11 DATA (16:31) nW AI T nW R nRD I NT* 6 4Mbit Serial EEPROM nW A IT nRD nW R TT1 B RDIN* I OCS1 I OCS2 EI RQ2

60Pin Network Connector

Memory Address Bus

DRA MA (0:1 1)

SDRAM _CAS ,SDRAM_RAS, BA0*,BA1* ,SDRAM_W E* , SDRAM _CS( 0:1) ,SDQM (0:3) , SD_CLK (1:2) ,CL KE

OPTION Network Card

14 EIRQ(0:3)* nI OCS(0:5)*
Supply Voltage Supervi sor

RESET*

Centronics Connector

74A CT245 Transceiver

ACK *, BUSY, SELECT, ERROR, FAULT* PD(0:7) SELI N* STROBE* A UTOFD* INI * 38
THV_PWM * ,MHV _PWM*, DEV_PWM,THV EN*, L DON* ,PMOTOR*, LSUCL K ,nVI DEO*
To HVPS & L REA DY * LSYNC* , LSU

DATA (0:7)

I OCS0

Engi ne I/F Connector

PANEL 8Pi n

74HCT273

D Fli p-Flop

Computer

Engine Controller B'd

OP Panel

Block Diagram

6-2 Engine Block Diagram

A0 - A15 PROGRAM MEMORY (27C512) SENSOR
Feed_Sensor Cover_Open SCF_RDY P_Empty P_Exit MP_Empty Output_Full Fuser_SW -------------------Size1 Size2 Size3 D_T_Sensor DET_CRU

ADC PWM

HVPS control THV READ THV / MHV / DEV PWM
D0 - D7 STEP MOTR DRIVER (TEA3718 for Main Motor & 2916 for Sub-Motor)

A0 74HC245

74HC245

CPU (KS88C4616)

11.59158MHz
SOLENOID DRIVE MAIN CLUTCH MP CLUTCH
2nd cassette Feeder (option)

Thermister value

FUSER CONTROL

PTL FAN

VIDEO CONTROLLER Interface
CPU Clock (X-tal) 11.59158MHz

7. Connection Diagram

PTL Ct r l 5V
CN 3 Micro Switch on Board In-24V Out-24VS
1 - GN D _- GN D _5 3- 5V 4- 5V 5 - GN D _6 - GN D _7- 24VS 8- 24VS 9- 24V 1 0- 2 4V

C20 50V1uF

C21 35V 1000uF

R20,26 2W 1K*2

C22 104K

R18 2.49KF
9-6 SMPS Circuit Diagram(110V)

CN3 9,10,11 5V GND

C25 10V 1000uF

CN3 6,7 5V 1.5A

C26 104

CN3 3,4,5 24V GND

NO MARKING RESISTOR 1/8W-J (5%)
FUSE1 250V 5A 222MAD CN1 TNR1 L 221K F.G N BD1 D3SB60 C224 C4 222MAD C2 R2 1W 100K C8 1K471 NP 1 D1 UF4007 R3 1W 100K BD2 JUMPER R14 1/4W22 C18 1K102 + 471K C6 400V 150uF C7 103K R4 3W 47K 3 C15 10V 1000uF D4 B5A90VI TNR2 I 1706 10D-9 R1 1W 560K LF1 C3 F2 250V 2A LF2 UL50055 TH1 R13 1/4W22 C14 1K102

U2 378R33

CN3 3.3V 1.5A

CN3 3.3V GND

L201 300uH R201 C201 D2 1N4148 Z1 1M150 D5 SF10LC20U R15 820
1W 47 FUSIBLE CN1 THY201 BTA12-600 R202 1/4W FUSIBLE 1W 180 C202 50V R203 BD3 JUMPER 630V 333 U1 SSP5N80

5 RRIC1(KA7552)

6 RPC2-Z2 24C RR11 3.6K-F (75KHz) C13 50V 33uF 6 NB R21 1/4WD3 200V1A R10 1/4W 22

C19 35V 1000uF

U3 KA431
SMPS Circuit Diagram(220V)

CN3 24V GND

U201 MOC3061

C23 1K102

U4 378R05
I R204 1/2W 1.5K R6 1W 0.15 CR9 C9 222J CC5 CN+24VS2 FUSER_ON CN222MAD PC1-1 PC123 CRD6 SF10LC6 C24 10V 1000uF

5V 1.5A

CN3 5V GND