samsung ml-1440 ml-1450 repair service manual

SERVICE

LASER PRINTERML-1450 SERIESML-1450 / ML-1451N

Manual

LASER PRINTER CONTENTS

1. Precautions

2. Specifications

3. Disassembly and Reassembly

4. Troubleshooting

5. Exploded Views and Parts List

6. Block Diagram

7. Connection Diagram

© Samsung Electronics Co.,Ltd. AUGUST 2002Printed in Korea.

VERSION NO. : 1.04 CODE : JC-0063A

This service manual is also provided on the web, the ITSELF system f Samsung Electronics Co., Ltd.

“http://itself.sec.samsung.co.kr”

lee lee

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.

Copyright (c) 2002. 8.Samsung Electronics Digital Printing CS Group

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 damageto the product.

3. Slots and openings in the cabinet are provided forventilation. To ensure reliable operation and to protectthe printer from ever heating, do not block or coverany of these openings. Do not place the printer in anenclosure unless the enclosure provides adequateventilation.

4. Never push objects of any kind into the printer throughthe cabinet ventilation slots as they may touch dan-gerous high voltage points, create short circuits,cause a fire, or produce an electrical shock. Neverspill liquid of any kind on the printer.

5. Do not place the printer in a location where someonemay trip on the cords.

6. Select a work surface that is large enough to hold theprinter.

7. Position the printer within six feet of the computer andwithin five feet of an electrical outlet.

8. Operate this printer using the power source (110V,220V, etc) indicated on the marking label. If you arenot sure of the type of power source available, consultyour dealer or local power company.

9. If you need to use an extension power cord with thisprinter, make sure that it uses a three-wire groundedcord and that the total ampere ratings for all of theproducts using the extension do not exceed theextension cord ampere rating. Also, make sure thatthe total of all products plugged into the wall outletdoes not exceed 15 ampere.

10. Do not allow anything to rest on the power cord ordata communications cable.

11. Unplug this printer from the wall outlet before clean-ing. Do not use liquid cleaners or aerosol sprays. Usea damp cloth for cleaning.

12. Do not touch the surface of the photo-sensitive drumas marks or scratches may impair print quality.

13. Do not expose the drum unit to direct light for pro-longed periods.

14. Use only standard papers, OHP films, and approvedenvelopes. Feed OHP films though the manual feedslot only. See specifications for approved papers andenvelopes.

15. Other than replacing consumables such as paperand toner, refer all questions to qualified service per-sonnel.

Precautions

1-1Samsung Electronics

1. Precautions

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

1-1 Safety Precautions

Especially mind the safety on the part withthis mark.You must use regular parts described in specifi-cations for the parts inflammable and where thecurrent can be flown. Otherwise any hazardsuch as an electric shock or a fire could occur.

LASER STATEMENT (LASERTURVALLISUUS)

WARNING : NEVER OPERATE AND SERVICE THE PRINTERWITH THE PROTECTIVE COVER REMOVEDFROM LASER/SCANNER ASSEMBLY. THEREFLECTIVE BEAM, ALTHOUGH INVISIBLE, CANDAMAGE YOUR EYES.

Class 1 laser product

Luokan 1 laserlaiteKlass 1 laser apparat

Allonpituus 770-795nmTeho 0.3mW±0.03mW

CAUTION

VORSICHT

ATTENTION

ATTENZIONE

PRECAUCION

CAUTION : Avoid exposure to invisible laser radiation when thedevelopment unit is not installed.

INVISIBLE LASER RADIATION WHENTHIS COVER OPEN. DO NOT OPENTHIS COVER.

UNSICHTBARE LASERSTRAHLUNG,WENN ABDECKUNG GEOFFNET.NIGHT DEM STRAHL AUSSETZEN.

REYONNEMENT LASER INVISIBLE EN CASD’OUVERTURE. EXPOSITION DANGERUSE AUFAISCEAU.

RADIAZIONE LASER INVISIBLE IN CASO DIAPERTURA. EVITARE L’ESPOSIZONE LA FASCIO.

REDIACION LASER INVISIBLE CUANDO SEABRE. EVITAR EXPONERSE AL RAYO.

Precautions

1-2 Samsung Electronics

1-2 Precautions on Disassembly and Reassembly

Very careful precautions should be taken when replacingparts. Before replacing, please check cables becauseyou cannot put the cables that you removed for replacingparts into the proper place if you would not make sure ofwhere they were connected and in which condition.

Please do the following before disassembling for a repairor replacement of parts.

1. Pull out paper cassette, printer cartridge installed.Especially careful not to be scratched by the surface ofdeveloper 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 replac-

ing parts.5. Do not force to open or fasten plastic material compo-

nents.6. Be careful that small parts such as screws should not

get in the printer.

7. When disassembling, assembling, also observe smallcomponents are located in place.

8. If you uncover and turn the machine over to replacesome parts, toner or paper particles may contaminatethe LSU window. Protect the LSU window with cleanpaper.

Releasing Plastic Latches

Many of parts are held inplace with plastic latches.The latches break easily :release them carefully.To remove such parts,press the hook end of thelatch away from the part towhich it is latched.

Precautions


1-3 Tools for Troubleshooting

The following tools are recommended for safe and smooth troubleshooting described in this service manual.

DCU(Diagnostic Control Unit)Standard: Test equipment to diagnose the Laserprinter supplied by Samsung Electronics.

DVM(Digital Volt Meter)Standard: Indicates more than 3 digits.

Electronic ScaleStandard: Equipment to check the weight of con-sumables(toner cartridge) supplied by SamsungElectronics. (The gram unit can be measured.)

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

PinsetStandard: For general home use, small type.

Cotton SwabStandard: For general home use, for medical ser-

vice.

Cleaning Equipments a IPA(IsopropylAlcohol)dry cloth or a soft stuff neutraldetergent.

Software(Driver) installation CD ROM

1

2

3

4

5

6

7

8

Mind your hands not to be touched whenyou disassemble and reassemble PBA ASS'Y,such as the main board, SMPS, HVPS.Note

Specifications


2. Specifications

Engine *Speed Up to 15 PPM in Letter size, Up to 14 PPM in A4 size

Resolution Up to 1200 DPI effective output (ML-1451N, Memory expansion recommended in ML-1450)

First Print Time Tray 1 : 15 seconds

Tray 2 : 17 seconds

Warm-Up Time Less than 40 seconds

Power Consump. Print : 350 W, Power save mode : Less than 12 W

Dimension(W * D * H) 361 x 409 x 294.5 mm(without options)

Weight 12.4 Kg / 27.3lb (SET)

**Acoustic Noise Stand by : Less than 35 dB, Operating : Less than 48 dB

Power Rating AC 100~127 V , 50 Hz

AC 220~240 V , 60 Hz

Controller Processor Power PC (166 MHz)

Memory RAM 4 M 16 M

Option DIMM Module ; 16, 32,64

ROM 4 Mbyte (16M bit x 2 : Program) Flash Memory

EEPROM 512 bytes

Emulation PCL6, PS 3(Optional)

Interface IEEE1284, USB, Network

OS Support Win 95/98/ME/NT4.0/2000/XP, Various Linux OS including Red Hat,

Caldera, Debian, Mandrake, Slackware, SuSE and Turbo Linux

N/W Option Default

Paper Input Cassette 550 sheets (75g/m2)

MP Tray 100 sheets (75g/m2)

20 sheets (OHP)

10 sheets (Letter, card)

25 sheets (Label)

Output Face Down 250 sheets

Face Up 100 sheets

Media Type A4, Letter. Legal, Executive, B5, A5, Folio, 7 3/4(Monarch),

#10, DL, C5, C6, B5

Type Single Cartridge

Life Up to 6,000 sheets (Set : Up to 3,000 sheets)

Periodic Pick Up Roller Up to 75,000 sheets

Replacing Feed Roller Up to 75,000 sheets

Parts Transfer Roller Up to 75,000 sheets

Fuser Up to 75,000 sheets

User Interface Key & LED 3Key, 4LEDs

LCD No

Toner Save YES

Reprint YES(Button)

ML-1450 ML-1451N

* Print speed will be affected by Operating System used, computing performance, application software, connectingmethod, media type, media size and job complexity.

** Sound Pressure Level, ISO 7779

Specifications


Environment Operation Environment Temperature 10 ~32°c (50°F ~ 90°F)

Humidity 20 ~ 80 % RH

Storage Environment Temperature -20 ~40°c (4°F ~ 104°F)

Humidity 10 ~90 % RH

Network Network Operation Systems Netware (3.x, 4.x), NDS and Bindery Mode

/REPRINT, PSERVER Mode

UNIX and Apple Talk

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 Ethernet 10/100 BaseTX (Auto Negotiation)

Network Management S/W Samsung’s 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 man-

age-ment (can manage NPC and printer options on

Web Browser)

ML-1450 ML-1451N

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 tomoving parts makes proper routing a must. If components are removed, any cables disturbed by the procedure must berestored as close as possible to their original positions. Before removing any component from the machine, note the cablerouting 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 becareful 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 theLSU window with clean paper.

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.



1. Open the printer cover.

2. Remove the cap.

3. Hold the cap at the both end of the roller, then removethe roller.

3-2 Transfer Roller



1. Remove two screws and remove the controller board. 2. Remove five screws securing the board and unplug allconnectors, and then take the controller board out ofthe printer.

3-3 Controller Board



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

2. Remove three screws from the left base bracket, andtake the bracket out.

3. Remove four screws securing the pickup assembly.

4. Take the assembly out.

5. Check the pickup rubber wear. If the rubber is heavilyworn, replace it with a new one.

3-4 Pickup Assembly

Push the solenoid ifyou have difficultyto remove thepickup assembly.

Squeeze this tab toremove the rubber.



1. Remove two screws and remove the controller board.

2. Remove two screws at the back of the printer andunplug one connector from the board, then open therear cover.

3. Open the printer cover, and open the MP tray.

4. Remove two screws securing the main cover.

5. Unlatch the front ends of the cover.

6. Slide the main cover upward, out of the printer.

3-5 Main Cover

Note that the power switchand the power connecterare properly released whenyou 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 shouldremove:


2. Remove the exit tray in the direction of arrow.

3. If you want to remove the roller shaft, unlatch bothends of the shaft and take it out

4. If you want to remove the exit roller, sqeeze the bottomof 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. Thenunplug two connectors from the LSU.

3-9 HVPS Board

1. Before you remove the HVPS board, you shouldremove:


2. Remove four screws and take the HVPS board out.



3-10 Drive Assembly

1. Before you remove the drive assembly, you shouldremove:


2. Remove six screws securing the drive assembly fromthe gear bracket and unplug one connector from themotor, and then take the drive assembly out.

3. If you want to remove the motor from the driveassembly, remove three gold screws securing themotor assembly to the gear bracket.

4. Remove the motor assembly. Remove two screwssecuring the motor to the motor bracket, then take themotor out.



3-11 Fan

1. Before you remove the fan, you should remove:


2. Remove two screws, and remove the fan. Thenunplug one connector.

3-12 Solenoid

1. Before you remove the solenoid, you should remove:


2. Remove two screws, and remove the solenoid. Thenunplug one connector.



1. Before you remove the fuser, you should remove:


2. Remove four screws and unplug one connector, andthen remove the fuser assembly.

To remove the thermostat from the fuser assembly

Remove two screws and take the thermostat out.

To remove the thermistor from the fuser assembly :

Remove one screw, and release the wire from the threeholders, and then take the thermistor out.

To remove the halogen lamp from the fuser assembly :

Remove two screws and take the halogen lamp out ofthe fuser assembly.

Note: When you reassemble the halogen lamp, makesure that it is inserted into the slot properly.

3-13 Fuser Assembly



To remove the heat roller from the fuser assembly :

1. Remove the halogen lamp. (see page 3-11)

2. Remove two CS-rings and two gears. Then removetwo screws securing the BRKT gear fuser and take thegear fuser out.

3. Remove two screws and take the cover fuser out.

4. Remove two screws and take the holder brushant out.

4. Remove the heat roller.

To remove the pressure roller from the fuserassembly :

Remove the roller.

pressure roller

BRKT gear fuser

CS-ring

Holder brush ant



3-14 Guide Feed & PTL Lamp

1. Before you remove the guide feed & PTLlamp, youshould remove:


2. Release the latches on the PTL lamp from the MPFass’y and unplug one connector, then remove the PTLlamp.

3. Remove two screws and raise the guide feed in thedirection of arrow.

4. Remove the guide feed.

PTL lamp



1. Before you remove the MPF assembly, you shouldremove:


2. Unplug two connectors and remove five screws, andthen take the MPF assembly out.

To replace the pickup roller :

1. Remove the e-ring.

2. Remove the roller.

3-15 MPF Assembly and Miscellaneous on MPF Assembly

To replace the nockup plate :

1. Turn the gear shown in the square in the direction ofarrow to release the nockup plate.

2. Remove the spring , then release the right end of theplate .

1 2

3. Remove the nockup plate.

e-ring



To replace the Paper Empty (PE) sensor :

1. Release the wire from the two holders. 2. Unlatch the PE sensor, then take it out.

To replace the pickup holder and the Adjust End MP:

1. Remove two screws and remove the MPT bracket

2. Raise the pickup holder in the direction of arrow.

3. Remove the pickup holder.

4. Remove the Adjust End MP

Adjust End MP



1. Before you remove the engine board, you shouldremove:


2. Remove six screws from the left and the right basebrackets and take them out.

3. Remove eight screws securing the PCU shield andremove two screws securing the SCF connector, andthen take the PCU shield out of the printer.

4. While you push the latch to release the PCU shield,take the PCU shield out of the printer.

5. Unplug all connectors from the PCU shield, andremove the shield.

3-16 Engine Board and Miscellaneous



To replace the exit board :

Unplug one connector from the controller board andremove one screw securing the board. Then releasethe wire from two holders and take the board out.

To replace the fuser sensor :

Remove two screws and take it out.

To replace the Cap sensor :

Remove two screws and take it out.

To replace the actuator empty :

Take the sensor out while you squeeze the both endsof the sensor.

Actuator empty



To replace the actuator feed

1. Turn the mechanism back and push down the pointsas shown to unlatch the actuator feed.

2. Turn the unit over again, and remove the actuatorfeed.

To remove the transfer guide :

Remove three screws and take the guide out.

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)

4-3 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)

4-4 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 tomelting 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)

4-5 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 Expendablesand the Standard of Guarantee .....Page(4-22)

4-5-4 Signs and Measures at Poor toner cartridge..........................................................Page(4-23)

4-6 The cause and solutions of bad environmentof the software

4-6-1 The printer is not working (1)...........Page(4-26)

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)

Troubleshooting


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 connectthe 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 theprinter.

Normal Code

While printing or warming up, it indicate the position of the paper

61 Warm up The printer is on, the cover is open or close.

00-05 Ready(kind of paper) 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

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.

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

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.

Troubleshooting


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.

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 +)

+800 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 outputby each HV terminal(-500V). Press the [Up] button to switch the voltage. The middle and right one of the threeLEDs are on and -650 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 toCheck 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.

07 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 1st LED ON/OFFPaper Empty Sensor (SCF) ON/OFF 2nd LED ON/OFFPaper Empty Sensor (MP) ON/OFF 3rd LED ON/OFFIncrement DCU Code No. (08, Sensor TEST)

08 Feed & Exit Sensor Test

Test the Feed sensor and Discharge sensor in the same way as '06'.

09 Cover Open Sensor Test

The same way as code '06'.

10 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.

11 Hot Burn Test

If the [enter] button pressed, the printer is continuously printing without detection. Turn the power off to stop operation.

12 Cleaning Mode Print Mode

Print the paper to clean the OPC Drum in the Cartridge.

Troubleshooting


13 THV(+) TRIGGER. ALL HV :

All high voltage output by each HV terminal and LSU and the fan is in operation. In this mode, electronicresistance of transfer roller and high voltage is detected.

14 +7P Clutch Test :

Same method of the code ‘06’.

15 Fan Test :

Indicates the function of the fan, same method of the code ‘06’.

16 Paper size Sensor Test :

Cassette Sensor 1 ON/OFF 1st LED ON/OFFCassette Sensor 2 ON/OFF 2nd LED ON/OFFCassette Sensor 3 ON/OFF 3rd LED ON/OFFIncrement DCU Code No. (00,MAIN MOTOR TEST)Decrement DCU Code No. (15, FAN TEST)

17 SMD Test :

This function is for a manufacturing process. You can test all diagnostic Codes(0~06).When you push the ‘Enter’ button, the main motor runs (Diagnostic Code 00).If you push the ‘up’ botton, the current diagnostic Code stops, and the next diagnostic Code starts.

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 theprinter 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 is detected inthe control board.

4-1-5 Paper Path Layout

LSULSUCARTRIDGECARTRIDGE

MPF

PICK UP

OPC

FEED

CR

IDLE

EMPTY SEN

FEED SENFEED SENDR

PTL

SR

TR

FUSERFUSER

FACE DOWN

FACE UPFACE UP

H/R

Pr/R

SCF

CASSETTE

EXIT SENEXIT1EXIT1

EXIT2

OUT BIN FULL SEN

Troubleshooting


4-1-6 DCU Panel

DIAGNOSTIC CONTROL UNITQUICK REFERANCE

04

05

07

08

09

10

BIAS 3

LSU READY

PAPER EMPTY

CRU

COVER OPEN

COER HEAT

BIAS 1

LSU MT&LD

SCF

EXIT SENSOR

COVER COVER

PRINT HEAT

BIAS 0

LSU MOTOR

MP

FEED SENSOR

OUT BIN

STANDBY HEAT

ON OFF

STATUS

SELF

TEST

DIAGNOSTIC

DIAGNOSTIC CODE

000102030405060708091011

12

13

14

15

16

17

00010203040506

2021�22�40�50

60�62�68�

�61�64�65�69�70�71�72�73�76�90�

�95

MAIN MOTOR OPERATIONMAIN HIGH VOLTAGE ONTRNSFER HIGH VOLTAGE (-)ONTHV(+) REFERANCE VOLTAGEDEV/SUPPLY VOLTAGE ONLSU OPERATING TESTPICKUP CLUTC ONPAPER EMPTY SENSOR TESTFEED & EXIT SENSOR TESTCOVER OPEN SENSOR TESTFUSER TESTHOT BURN TEST

CLEAN (MESSAGE)PRINT

THV(+)TRIGGER &THV ON

MP PICKUP ON

FAN TEST

PAPER SIZE SENSOR TEST

SMD TEST

GREEN STATUS CODE

8899

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 ONPAPER OUT

OPEN FUSER ERRORLOW HEAT ERROROVERHEAT ERROR

WARM UPCOVER OPEN ERRORCRU ERRORSLEEP MODENO PAPERR or CASSETTEPAPER JAM 0PAPER JAM 1PAPER JAM 2OUTBIN FULL ERRORMANUAL PRINT MODE

LSU NOT READY

DCU MODE DOWN SHIFT STOP

UP ENTER

O ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSLTHE PRINTER POWER ON.

Troubleshooting


4-2 The cause and solution of Bad image

4-2-1 Vertical Black Line and Band

• Description1. Straight thin black vertical line occurs in the printing.2. Dark black vertical band occur in the printing.

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Check and Cause Solution

1. Damaged develop roller in the Developer.Deformed Doctor-blade or cleaning-blade.

2. Scratched surface of the discharge rollerin the developer.

3. Partly depression or deformation on thesurface of the transfer roller.

1. If causes 1 and 2 occur in the developercartridge, replace the developer and try toprint out.

2. Replace the transfer roller if occurred asNo. 3.

4-2-2 Vertical White Line

• Description White vertical voids in the image.



1. Foreign matter stuck onto the window ofinternal lenses of LSU mirror.

2. Foreign matter or toner particles betweenthe developer roller and blade.(In case the life of the developer 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 devel-oper frame.

4. If the fuser is defective, voids occur peri-odically at the top of a black image.

1. Foreign matter stuck onto the window :Clean the LSU window with recommend-ed cleaner(IPA) Clean the window with aclean cotton swab.

2. Foreign matter in the LSU : Open thecover of LSU and clean with a cottonswab on the surface of the reflex mirror.

3. No 3. : Remove the foreign matter andburr of the exposure window.(Developer 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 developer cartridge.

Troubleshooting


4-2-3 Horizontal Black Band

• Description1. Dark or blurry horizontal stripes occur in the printing periodically.

(They may not occur periodically.)



1. Bad contacts of the voltage terminals todeveloper.

2. The rollers of developer may be stained. Charge roller = 38.5mmSupply roller = 51mmDevelop roller = 50mmTransfer roller = 56.8mm

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 thedeveloper.

4-2-4 Black/White Spot

• Description1. Dark or blurry black spots occur periodically in the printing.2. White spots occur periodically in the printing.



1. If dark or blurry black spots occur periodi-cally, the rollers in the Developer may becontaminated with foreign matte or paperparticles.( Charge roller : 38.5 mm intervalOPC drum : 96 mm interval)

2. If faded areas or voids occur in a blackimage at intervals of 96 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 96 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 125,000sheets printing. If the roller's life is expired,replace it.

4. In case of 38.5 mm interval unremovable in1, take measures as to replace the develop-er cartridge 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


4-2-5 Light Image

• Description The printed image is light, with no ghost.



1. Develop roller is stained when the tonerof developer cartridge is almost con-sumed.

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.

2. No 1 : Replace the developer cartridge andtry to 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 directions.

4-2-6 Dark Image or a Black

• Description The printed image is dark.



1. No charge voltage in the engine board. ( Perform DCU diagnostic code 01)

2. Charge voltage is not turned on due tothe bad contacts between power supplyin the side of the Developer and chargeterminal of HVPS.

1. Clean the high voltage charge terminal.

2. Check the state of the connector whichconnects the engine board and HVPS.

3. Replace the HVPS if not solved by theabove direction 1 and 2.

Troubleshooting


4-2-7 Uneven Density

• Description Print density is uneven between left and right.


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 Developer has expired.

3. The toner level is not even on the devel-oper roller due to the bad blade.

1. Replace both the left and right SpringHolder.

2. Occur in the developer cartridge, replacethe developer and try to print out.

4-2-8 Background

• Description Light dark background appears in whole area of the printing.



1. Recycled recording paper has beenused.

2. The life of the Developer has expired.

3. The up-to-down movement of the trans-fer roller is swift?

4. The HVPS is normal?(Perform DCU diagnostic code 01~04)

1. B/S is not guaranteed when using recycledpaper.

2. Replace the Developer that has expired.

3. Clean the busing part of the transfer roller.

4. Replace the Developer if not solved by theabove direction 1~3.

Troubleshooting


4-2-9 Ghost (1)

• Description Ghost occurs at 96 mm intervals of the OPC drum in the whole printing.

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96 mm


1. Bad contacts caused by contaminationfrom toner particles between high voltageterminal in the main body and the elec-trode of the Developer.

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 developer is expired.

4. Transfer roller lifetime(125,000 sheets)has expired.

5. Abnormal low temperature(below 10°C).

6. Damaged cleaning blade in the developer.

1. Clean the terminals when contaminated bytoner particles.


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.


4-2-10 Ghost (2)

• DescriptionGhost occurs at 96 mm intervals of the OPC drum in the whole printing.(When printing on card stock or transparencies using manual feeder)

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96 mm


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.

Troubleshooting


4-2-11 Ghost (3)

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

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51 mm


1. The life of the developer may beexpired.

2. The abnormal voltage and bad contact ofthe terminal of the supply roller


2. Check the approved voltage of the supplyroller and contact of the terminal and adjustif necessary.

4-2-12 Ghost (4)

• Description Ghost occurs at 70 mm intervals.

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m


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)

4-2-13 Satins on the Face of Page

• Description The background on the face of the printed page is stained.



1. Toner leakage due to improperly sealeddeveloper.

2. If the transfer roller is contaminated, satinson the face of page will occur.

1. Replace the developer 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


4-2-14 Satins on Back of Page

• Description The back of the page is stained at 56.1 mm intervals.

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70 mm


1. Transfer roller is contaminated.

2. 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.

4-2-15 Blank Page Print out (1)

• Description Blank page is printed.



Bad ground contacts in OPC and/or devel-oper.

Remove contamination of the terminals of thedeveloper and the unit.

4-2-16 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.

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1. Bad ground contacts in OPC and/ordeveloper.

2. Abnormal solenoid.

1. Remove contamination of the terminals ofthe developer.

2. Perform the engine self test using DCU to checkif the Solenoid is normal.(refer to code 06)

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.

Troubleshooting


4-3 The cause and solution of the bad discharge

4-3-1 Wrong Print Position

• Description Printing begins at wrong position on the paper.


Wrong sense time caused by defective feed sensoractuator.

Replace the defective actuator

4-3-2 JAM 0

• Description1. Paper is not exited from the cassette.2. Jam-0 occurs if the paper feeds into the printer.

JAM 0


MPF

PICK UP

FEED

IDLE

EMPTY SEN

FEED SEN

TR

FUSERFUSER

FACE DOWN

FACE UPFACE UP

H/R

Pr/R

CASSETTE

EXIT SEN

EXIT1EXIT1

EXIT2

OUT BIN FULL SEN


1. Check the Solenoid by using DCUdiagnostic mode 06.

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-pickupbecome open or is broken away.

5. If the paper feeds into the printerrand Jam 0 occurs, perform DCU 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 Housing-Pickup and/orShaft-Pickup.

Troubleshooting


4-3-4 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.

JAM 2


MPF

PICK UP

FEED

IDLE

EMPTY SEN

TR

FUSERFUSER

FACE DOWN

FACE UPFACE UP

H/R

Pr/R

CASSETTE

EXIT1EXIT1

EXIT2

OUT BIN FULL SEN

EXIT SEN

EXIT SEN


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 unformed

(Check if the lever part is unformedin shape).

• Check whether burrs occur in theassembly part of the actuator exit ornot and if the actuator is smoothlyoperated.

• Check if foreign matters 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.

4-3-3 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.

JAM 1


MPF

PICK UP

FEED

IDLE

EMPTY SEN

TR

FUSERFUSER

FACE DOWN

FACE UPFACE UP

H/R

Pr/R

CASSETTE

EXIT1EXIT1

EXIT2

OUT BIN FULL SEN

EXIT SEN

EXIT SEN


1. If the recording paper is jammed infront of or inside the fuser.(Perform DCU diagnostic code of)

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.

2. Reassemble the Actuator-Feed andSpring-Actuator if the returning is bad.

Troubleshooting


4-3-5 Multi-Feeding

• Description Multiple sheets of paper are fed at once.


1. Solenoid malfunction(the solenoid does not workproperly): Perform DCU mode : solenoid check 06.

2. Pad-Friction is contaminated with foreign matter.(oil...)

3. The face of paper is blended.

1. Replace the solenoid if necessary.

2. Clean the pad friction with soft clothe dampenedwith IPA(Isopropyl Alcohol).

3. Use the smooth paper.

4-3-6 Paper rolled in the fuser

• Description If contaminated at intervals of 57mm on the back of a paper.


1. Contamination of the pressure roller.(Background, Hot off set)

1. Disassemble the fuser, clean the area between theHeat-roller and Thermistor and remove the foreignmatter of the pressure roller.

2. If background appears badly in the printing, fix it byreferring to the solutions for background.(See 4-2-8 Background)

Troubleshooting


4-3-7 OPC

• Description Paper is rolled up in the OPC.


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 IPA(Isopropyl Alcohol) or tis-sue.

Troubleshooting


4-4 The cause and solution of the malfunction

4-4-1 All LEDs blinking (Fuser Error)

• Description1. All the lamps on the operator panel blink. 2. Gear of the fuser does not work and breaks away melt away.

When printing, motor breaks away from its place due to defective fuser gear.


1. Check if the thermostat, AC wire and Heat Lamp isopen.

2. Check if the thermistor sensor is in place.

3. Check if the heat lamp works properly.

4. Check if the overheat circuit works properly.

5. The fuser gear is defective due to melting away.

1. If the thermostat is open replace the fuser andcheck following items.

2. If the thermistor sensor device is located deep in thesponge, replace the fuser.

3. Check if the circuit of overheat mode works properly.

4. Run DCU mode : Perform DCU diagnostic code 10.

4-4-2 All LEDs blinking (Scan Error)

• Description 1. All lamps on the operator panel blink.


DCU Mode : Perform DCU diagnostic code 05. If the DCUerror code 95 is displayed, replace LSU.

Replace LSU.

If you cannot solve the problem after you replace LSU,replace the main board.

Troubleshooting


4-4-3 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.


DCU Mode : Check if the Error States '60' '62' '68' occur.Check the operation of Fuser Erasing Lamp On/Off withthe Error Code Check -10-.

1. Replace the Fuser.

2. Replace the Main Control board.

4-4-4 Paper Empty

• Description The paper lamp on the operator panel is on even when paper is loaded in the cassette.


1. Bending or deformation of the actuator of the paper sen-sor.

2. The function of the engine board is defective PerformDCU mode: Perform DCU diagnostic code 8.

1. Replace the defective actuator.

2. Replace the engine board.

4-4-5 Paper Empty without indication

• Description The paper lamp on the operator panel does not come on when the paper cassette is empty.


1. Bending or deformation of the actuator of the paper sen-sor.

2. The function of the engine board is defective Perform.DCU mode : Perform DCU diagnostic code 8.

1. Replace the defective actuator.

2. Replace the engine board.

Troubleshooting


4-4-6 Cover Open

• Description The ERROR lamp is on even when the print cover is closed.


1. The Hook Lever in the top cover may be defective.

2. Check the connector (Engine B’d↔HVPS) and circuit ofthe cover switch department in the Main Control board.Perform DCU mode : If Error state '64' occurs, Check therelated codes of the Cover Open Error.

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.

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


1. Check the connector(CN8) and circuit of the cover switchdepartment in the Main Control board. Perform DCUmode : If Error state '64' occurs, Check the related codesof the Cover Open Error

1. Check the insertion of the Cover Open S/WConnect.

2. Replace the Main Control board or Cover OpenS/W.

Hook Lever

Troubleshooting


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'.


1. Motor harness or sub PCB may be defective.

2. Perform DCU diagnostic code 00 and Check the motoroperation.

1. Check the motor harness, replace it, if defective.

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.


1. Check if the power input and SMPS output are normal.

2. Check the inferiority of LED-Panel on the front-cover ifthe LED of Panel does not appear after normal warming-up.

1. Replace the power supply cord or SMPS.

2. Replace the control board.

3. Replace the LED-panel.

Troubleshooting


4-4-10 Vertical Line Getting Curved

• Description When printing, vertical line gets curved.


1. If the supply of +24v is unstable in the Main Control boardlinking with LSU, check drive by DCU Mode: LSU Check-05- LSU Motor on.

1. Replace LSU.

2. Replace the Main Control board.

Troubleshooting


4-5 Toner Cartridge Service

It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by theSamsung 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 thetoner(Shake the toner cartridge), however, you should replace the toner cartridge to solve the problem thoroughly.

4-5-3 Judgment of a genuine Toner Cartridge

Genuine Label :The prevention of disassembly

Capacity indication Label

One-way Screw

One-way Screw

Troubleshooting


4-5-4 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 developer andthen recheck.

(1)NG: Check the weight of thedeveloper

(2)OK: Lack of toner, so the lifeis nearly closed.

2. Some part of image is notprinted - Shake the develop-er and then recheck.

(1)NG: Check the weight of thedeveloper and cleanthe LSU window with acotton swab, thenrecheck.

(2)OK: Lack of toner, so the lifeis nearly closed.

3. Periodically a noise as "ticktick" occurs - Measure thecycle and the weight of thedeveloper.

4. White vertical stripes on thewhole screen or partly : Check the weight of thedeveloper.

1. Toner is fallen on the paperperiodically.

(1)Check the cycle of thefalling of the toner.

(2)Check the appearance ofboth ends of the developerOPC 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 developer.

(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 developerafter 50-100 sheets in the clos-ing state of the life span.

2. In case of 2-If it becomes better after clean-ing the LSU window, then thedeveloper 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 thedeveloper has been nearlyexhausted.( Purchase andreplace with a new developerafter using about 200 sheets atthe point of occurrence)

4. In case of 3-This is a phenomenon causedby lack of toner, so replace witha new developer.

1. If both ends of the OPC drumare contaminated with toner:Check the life of the developer.

2. Check whether it could be recy-cled.

3. If it cannot be recycled:Replace the developer.


Troubleshooting



White Black spot

Recycled product

• Light or dark blackdots on the imageoccur periodically.

• White spots occurin the image period-ically.

• Poor appearance ofthe developer.

• Unclean and roughprintouts.

• Bad background inthe image.

1. If light or dark periodical blackdots occur, this is because thedeveloper rollers are contami-nated with foreign substanceor paper particles.(1)38.5mm interval : Charged

roller(2)96mm interval : OPC cycle

2. If white spots occur in a blackimage at intervals of 96mm, 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 devel-oper.

(1)Check the damage to labeland whether different materi-als are used.

(2)Check the appearance ofparts of the developer, suchas frame, hopper.

2. Unclean and rough printouts.(1)Check whether foreign sub-

stance or toner are stuck tothe terminal (contact point) ofthe developer.

(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 38.5mm - Replacethe developer.

: at intervals of 96mm - Removeforeign substance.

: Broken image - Replace thedeveloper according to care-lessness.

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 developer.(2)If materials other than normal

parts of the developer areadded or substituted.

2. In case of 2 - If there are anyabnormals in connection with thesituation of 1.(1)It occurs when the developer

is recycled over 2 times.(2)If toner nearly being expired

are collected to use, it isjudged as the recycled devel-oper.


Troubleshooting



Ghost & ImageContamination

• The printed imageis too light or dark,or partially contami-nated black.

• Totally contaminat-edblack.(Black image print-ed out)

• The density of print-outs is too dark andghost occurs.

1. The printed image is too lightor dark, or partially contami-nated black.

(1)Check whether foreign sub-stance or toner are stuck tothe terminal(point of contact)of the developer.

(2)Check whether the terminalassembly is normal.

2. Totally contaminated black.(Black image printed out)Check whether foreign sub-stances are stuck to the ter-minal(point of contact) of thedeveloper and the state ofassembly. (Especially check thecharged roller terminal.)

3. The printed image is dark andghost occurs.Check foreign substanceattached to the terminal (pointof contact) of the developerand the state of assembly. (Especially check the develop-ing roller terminal.)

1. All of 1, 2, 3 above(1)Remove toner and foreign sub-

stances adhered to the contactpoint of the developer.

(2)The contact point of the unitfacing that of the developeralso 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 developer is notelectrically charged. Clean theterminals of the charged roller,then recheck it.

3. In case of 3It is a phenomenon as the devel-oping bias voltage of the devel-oper. Clean the terminals of thedeveloping roller, then recheck it.

Troubleshooting


4-6 The cause and solutions of bad environment of the software

4-6-1 The printer is not working (1)

• Description While Power turned on, the printer is not working in the printing mode.


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). Perform DCU to check theError Status.

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


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.


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.

Troubleshooting


4-6-3 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.


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


4-6-4 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).


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.

Samsung Electronics 5-1

5. Exploded Views and Parts List

5-1 Main Assembly Exploded view ................................................................................................................. page(5-2)

5-2 Top Assembly Exploded view ................................................................................................................... page(5-4)

5-3 Frame Assembly Exploded view .............................................................................................................. page(5-6)

5-4 Exit Assembly Exploded view .................................................................................................................. page(5-9)

5-5 Fuser Assembly Exploded view ............................................................................................................... page(5-11)

5-6 Rack-MPF Assembly Exploded view ....................................................................................................... page(5-13)

5-7 Drive Assembly Exploded view ................................................................................................................ page(5-15)

5-8 Pick-Up Assembly Exploded view ............................................................................................................ page(5-17)

5-9 Cassette Assembly Exploded view .......................................................................................................... page(5-19)


Exploded Views and Parts List

5-1 Main Assembly Exploded view

0

1

2

3

20

4

56

7

8

9

10

11

12

1211-1

11-2

13

13-1

13-2 13-313-4

13-5

14

15

16

17

18-1

18-2

21

22

19

18

26

23

25

24

27

SAMSUNG

27-1

27-2

27-3

27-7

27-7

27-427-5

27-6



< Main Assembly Parts List >

NO DESCRIPTION SEC CODE Q’TY SA REMARK

SA. : Service Available

O: Service available X: Service not available

1 ELA HOU-COVER MAIN <see page 5-5> 1 X2 UNIT-LSU JC59-00004A 1 O3 ELA UNIT-MOTOR JC96-02058A 1 O4 ELA UNIT-DEVE * 1 X5 ELA HOU-MPF JC96-01650B 1 O6 MEA RACK-FEEDER CST JC97-01323D 1 O 500 SHEETS7 CBF-HARNESS-MOTOR * 1 X8 MEA UNIT-FEEDER JC97-01324A 1 O9 CBF HARNESS-ENG SCF JC39-00154A 1 O10 PMO-SUPPORT SCF JC72-00639A 1 O11 MEA UNIT-BRKT BOTTOM(L) JC97-01315A 1 O

11-1 FOOT-RUBBER * 1 X11-2 PMO-BRKT BASE L * 1 X

12 IPR-BAR CROSS BOTTOM JC70-00098A 2 O13 MEA UNIT-BRKT BOTTOM(R) JC97-01316A 1 O

13-1 FOOT-RUBBER * 1 X13-2 IPR-PLATE CST GUIDE * 1 X13-3 PMO-BRKT BASE R * 1 X13-4 SCREW-TAPTITE * 3 X13-5 IPR-GROUND SCF BASE * 1 X

14 IPR-SHIELD PCU JC70-00080A 1 O15 PCT-INSULATOR PCU JC72-00334A 1 O16 PBA MAIN-ENGINE_V1(110V) JC92-01394A 1 O 110V

PBA MAIN-ENGINE_V2(220V) JC92-01396A 1 O 220V17 ELA UNIT-FRAME BASE_V1(110V) JC96-01641M 1 O 110V

ELA UNIT-FRAME BASE_V2(220V) JC96-01641L 1 O 220V18 ELA HOU-CONTROLLER <see page 5-5> 1 O

18-1 PBA MAIN CONTROLLER JC92-01393A 1 O ML-1450PBA MAIN CONTROLLER JC92-01408A 1 O ML-1451N

18-2 PBA ETC-8M DRAM JC92-01298A 1 O Only ML-1450G/XAA19 AS-FUSER ASSY_V1(110V) JC81-00395B 1 O 110V

AS-FUSER ASSY_V2(220V) JC81-00395A 1 O 220V20 CBF HARNESS-LSU * 1 X21 PBA PWR-HVPS JC92-01313A 1 O22 MEA RACK-HOU EXIT JC97-01338L 1 X23 PMO-DUCT FAN JC72-00582A 1 O24 MEA RACK-CAST,SCF * 1 X OPTIONAL25 ELA HOU-SCF * 1 X OPTIONAL26 PMO-COVER CONTROLLER JC72-00358A 1 O27 MEA UNIT-MP TRAY JC97-01325A 1 O

27-1 PMO-COVER MP JC72-00349A 1 O27-2 NPR-BADGE BRAND JB71-00027A 1 O27-3 PMO-TRAY EXTENTION MP JC72-00354A 1 O27-4 PMO-TRAY HOLDER MP JC72-00353A 1 O27-5 IPR-GUIDE LATCH JB70-10906A 1 O27-6 PMO-SIDE GUIDE MP JC72-00547E 1 O27-7 PMO-TRAY LINK MP JC72-00350A 2 O



5-2 Top Assembly Exploded view

0

1

2

14

9

4

10

11

12

133

4

67

5

8




< Top Assembly Parts List >



0 ELA HOU-COVER MAIN < See below table > 1 O1 PMO-COVER OPEN * 1 X2 COVER-M-MAIN(14-ENG) * 1 X3 PMO-CAP REAR * 1 X4 PMO-STOPPER HINGE OPEN * 2 X5 PMO-LENS LED * 1 X6 PMO-KEY BUTTON * 1 X7 PMO-KEY SAVE MODE * 1 X8 PBA SUB-PANEL_II * 1 X9 PMO-LEVER_EMPTY,MP * 1 X10 PMO-STOPPER_EXIT,P * 1 X11 PMO-COVER REAR * 1 X12 PMO-STACKER REAR * 1 X13 IPR-SPRING LOCKER REAR * 2 X14 PMO-SUPPORT MP TRAY * 1 XS1 SCREW-TAPTITE * 6 X

ML-1450/ETS JC96-02269E JC96-02424D

ML-1450/MSN JC96-02269E JC96-02424A

ML-1450/SAU JC96-02269E JC96-02424B

ML-1450/SKL JC96-02269E JC96-02424A

ML-1450/XAA JC96-02269E JC96-02424A

ML-1450/XAC JC96-02269E JC96-02424A

ML-1450/XAP JC96-02269L JC96-02424A

ML-1450/XAX JC96-02269L JC96-02424A

ML-1450/XEB JC96-02269E JC96-02424A

ML-1450/XEC JC96-02269L JC96-02424A

ML-1450/XEF JC96-02269K JC96-02424A

ML-1450/XEG JC96-02269E JC96-02424A

ML-1450/XEN JC96-02269E JC96-02424A

MODEL ELA HOU-COVER MAIN ELA HOU-CONTROLLER

ML-1450/XEP JC96-02269E JC96-02424A

ML-1450/XET JC96-02269E JC96-02424A

ML-1450/XEU JC96-02269E JC96-02424A

ML-1450/XEV JC96-02269V JC96-02424A

ML-1450/XIL JC96-02269J JC96-02424A

ML-1450/XIP JC96-02269E JC96-02424B

ML-1450/XSA JC96-02269E JC96-02424A

ML-1450/XSE JC96-02269E JC96-02424A

ML-1450/XSG JC96-02269E JC96-02424B

ML-1450/XST JC96-02269E JC96-02424C

ML-1451N/XEF JC96-02269Q JC96-02424A

ML-1451N/XEG JC96-02269T JC96-02424A

ML-1451N/XEU JC96-02269T JC96-02424A

ML-1450G/XAA JC96-02269E JC96-02424C

MODEL ELA HOU-COVER MAIN ELA HOU-CONTROLLER

ML-1450/TSE JC96-02269E JC96-02424F



5-3 Frame Assembly Exploded view

29-4

29-1

29-2

29-3

25-125-2

24-224-1

25

24

27

26

42

9

41

43

23

22

29

4

22-1

22-3

22-2

22-4

14 13

7

21

16

17

5

16-1

16-2

16-316-4

346

46

45

4547

47

48

8

19-2

18-218-1

19-1

11

0

15

15-1

15-2

15-3

244

39

19

1

3

38

20

36

30

31

30-3

30-2

30-1

31-231-3

31-1

3232-1

32-2

34

33

50

35

51

28

28-128-2

18

10

49-149-349-2

49



< Frame Assembly Parts List >


0 ELA UNIT-FRAME BASE JC96-01641M 1 O 110VELA UNIT-FRAME BASE JC96-01641L 1 O 220V

1 FAN-DC-HAWK JC31-00004A 1 O2 PMO-GUIDE RIB * 1 X3 CBF HARNESS-INLET ASS’Y * 1 X4 PMO-HOLDER WIRE * 1 X5 KEY DEVE * 1 X6 GEAR-EXIT /U ID * 1 X7 CBF-HARNESS_FUSER * 1 X8 PBA SUB-EXIT SENSOR * 1 X9 CBF-HARNESS-THERMISTOR JOINT * 1 X10 CBF-HARNESS-MP_CLUTCH ENG * 1 X11 PBA SUB-FUSER SW JC92-01261B 1 O13 PMO-FRAME COVER * 1 X14 IPR-TERMINAL FU * 2 X15 ELA-UNIT-HOLDER TR L JC96-01730A 1 O

15-1 PMO-BUSHING TR * 1 X15-2 SPRING TR L * 1 X15-3 PMO-TRANSFER HOLDER * 1 X

16 ELA-UNIT-HOLDER TR R JC96-01729A 1 O16-1 PMO-BUSHING TR * 1 X16-2 SPRING TR R * 1 X16-3 PMO-TRANSFER HOLDER * 1 X16-4 IPR-PLATE TR * 1 X

17 GEAR-TR 29 JC66-00039A 1 O18 ELA UNIT-GUIDE DEVE L * 1 X

18-1 PMO-GUIDE DEVE L * 1 X18-2 SPRING GUIDE DEVE * 1 X

19 ELA UNIT-GUIDE DEVE R * 1 X19-1 PMO-GUIDE DEVE R * 1 X19-2 SPRING GUIDE DEVE * 1 X

20 ELA HOU-VARISTOR JC96-01772A 1 O21 IPR-TERMINAL TR * 1 X22 ELA UNIT-SENSOR DEVE * 1 X

22-1 PBA SUB-SWITCH * 1 X22-2 PMO-HOLDER ACTUATOR * 1 X22-3 PMO-ACTUATOR DEVE * 1 X

23 GROUND FU * 1 X24 ELA UNIT-TERMINAL TR S * 3 X

24-1 ICT-SHAFT HV LARGE * 3 X24-2 SPRING-HV LARGE * 3 X

25 ELA UNIT-TERMINAL TR L * 1 X25-1 ICT-SHAFT HV LARGE * 1 X






25-2 SPRING-HV SMALL * 1 X26 GROUND-HVPS * 1 X27 IPR-REMOVE KEY JC70-00139A 1 O28 ELA UNIT-ACTUATOR FEED * 1 X

28-1 PMO-ACTUATOR FEED * 1 X28-2 PMO-HOLDER ACTUATOR * 1 X

29 ELA UNIT-GUIDE TRANSFER * 1 X29-1 PMO-HADER SAW PLATE * 1 X29-2 IPR-PLATE SAW * 1 X29-3 IPR-GUIDE TRANSFER * 1 X29-4 PMO-GUIDE RIB TR * 1 X

30 ELA UNIT-GUIDE FEED HAWK16 JC96-01653C 1 O30-1 PMO-GUIDE OPTIC * 1 X30-2 GUIDE FEED * 1 X30-3 PMO-HOLDER G/PAPER * 1 X

31 ELA UNIT-PTL * 1 X31-1 GUIDE PLATE FEED * 1 X31-2 PMO-HOLDER PTL * 1 X31-3 PBA SUB-PTL * 1 X

32 ELA UNIT-EMPTY ACT * 1 X32-1 PMO-ACTUATOR EMPTY HAWK * 1 X32-2 SPRING EMPTY * 1 X

33 PMO-HINGE GUIDE FEED JC72-00321A 1 O34 IPR-GND ICU 2 JC70-00150A 1 O35 PMO-CAP SENSOR * 1 X36 GND MP * 1 X37 GEAR P/UP DRV JC66-40219A 1 O38 GROUND MOTOR * 1 X39 IPR-GUIDE DUST * 1 X41 IPR-OPC-HAWK * 1 X42 CAP CONNECTOR L * 1 X43 CAP CONNECTOR U * 1 X44 MEC-ROLLER TRANSFER JC75-10963B 1 O45 GEAR IDLE Z27 * 1 X46 RING-CS * 2 X47 WASHER-PLAIN * 2 X48 IPR-WASHER SPRING SU * 1 X49 ELA UNIT-ACTUATOR FEED HAWK14 * 1 X

49-1 PMO-ACTUATOR FEED * 1 X49-2 PMO-HOLDER ACTUATOR * 1 X49-3 SPRING ETC-FEED HAWK14 * 1 X

50 PMO-GUIDE_SKEW(12) * 1 X51 IPR-TERMINAL TR HAWK * 1 X

< Frame Assembly Parts List Cont.>





5-4 Exit Assembly Exploded view

13

14

S1

S1

15

169

7

8

6

5

10

11

4

2

3

1

0

16

S1

S1



< Exit Ass’y Parts List >SA. : Service Available



0 MEA RACK-HOU EXIT JC97-01338L 1 O

1 PMO-FRAME REAR * 1 X

2 GEAR-EXIT/U, ID * 1 X

3 RING-CS * 2 X

4 GEAR-IDLE 25 * 1 X

5 SPRING-F/DOWN * 4 X

6 PMO-HOLDER EXIT_F/DOWN * 4 X

7 PMO-ROLLER-EXIT, MAIN * 4 X

8 PMO-ROLLER-EXIT, FR * 4 X

9 MEC-BEARING, EXIT RING-C * 2 X

10 MEA UNIT-ROLL EXIT * 1 X

11 GEAR-EXIT * 1 X

12 MEC-BEARING, EXIT RING-C * 2 X

13 HOLDER LEVER * 2 X

14 LEVER STACKING * 2 X

15 GUIDE EXIT * 1 X

16 RING-C * 2 X

S1 SCREW TAPTITE * 4 X



5-5 Fuser Assembly Exploded view

38

27

26

2423

22

21

25

18

20

1928

3534

30

29

33

31 32

17

16 15

141

13

911

1

12

10

3

58

1

6

737

36

42

0

12




0 AS-FUSER ASSY JC81-00395B 1 O 110V

AS-FUSER ASSY JC81-00395A 1 O 220V

1 SCREW TAPTITE M3 x 8, BH+ * 10 X

2 SCREW TAPTITE M3 x 10, FH+ * 1 X

3 SCREW MACHINE M3 x 6 * 2 X

4 THERMISTOR-FUSER JC14-00001A 1 O

5 ELECTRODE FU R * 1 X

6 ELECTRODE FU M * 1 X

7 ELECTRODE FU L * 1 X

8 THERMOSTAT * 1 X

9 BRKT GEAR FUSER * 1 X



12 RING-CS * 2 X

13 COVER FUSER * 1 X

14 ROLLER EXIT_F/UP * 3 X

15 EXIT_F/UP (SPRING) * 3 X

16 SPRING-CLAW * 4 X

17 GUIDE-CLAW * 4 X

18 LAMP-HALOGEN 4713-001135 1 O 110V

LAMP-HALOGEN 4713-001136 1 O 220V

19 NEX-ROLLER-HEAT JC71-20901A 1 O

20 MEC-ROLLER PRESSURE JC75-00114A 1 O

21 FRAME FUSER * 1 X

22 PMO-GUIDE INPUT * 1 x

23 GEAR FUSER, Z32 * 1 X

24 BUSHING HR-L * 1 X

25 BUSHING HR-R * 1 X

26 SPRING-BEARING PR * 2 X

27 BUSHING PR * 2 X

28 GUIDE REAR * 1 X

29 SHAFT EXIT_F/UP * 1 X

30 BUSHING_TX * 3 X

31 GEAR-EXIT * 1 X

32 RUBBER EXIT * 3 X

33 RUBBER EXIT F/UP * 1 X

34 ACTUATOR EXIT * 1 X

35 SPRING-ACTUATOR * 1 X

36 HOLDER BRUSH * 1 X

37 BRUSH ANTISTATIC * 1 X

38 HOLDER SHAFT * 1 X

< Fuser Assembly Parts List >





5-6 Rack-MPF Assembly Exploded view

0

4 11 16 8

10 12

16 18 17

15 18 3

7

24

1

5

25

2021

14

6

13

22

2

9

19

26




0 ELA HOU-MPF JC96-01650B 1 O

1 PHOTO-INTERRUPTER 0604-001095 1 O

2 SCREW-TAPTITE * 2 X

3 WASHER-PLAIN * 1 X

4 SOLENOID * 1 X

5 CBF-HARNESS-MP_EMPTY * 1 X

6 SPRING KNOCK UP * 1 X

7 SPRING-PICK UP, MP * 1 X

8 BRACKET_MP * 1 X

9 PMO-PLT KNOCK_UP, MP * 1 X

10 ICT-SHAFT_P/U, MP * 1 X

11 PMO-GEAR P/U MP * 1 X

12 PMO-CAM PICK UP MP * 1 X

13 PMO-FRAME_MP * 1 X

14 PMO-HOLDER_P/U,MP * 1 X

15 PMO-HOUSING_P/U, MP * 1 X

16 PMO-BEARING-PICK UP * 2 X

17 RMO-RUBBER_P/U, MP * 1 X

18 PMO-IDLE PICK UP, MP * 2 X

19 RPR-PAD KNOCKUP, MP * 1 X

20 RCR-FRICTION PAD 1 MP * 1 X

21 RCR-FRICTION PAD 2 MP * 1 X

22 PMO-RING KNOCK UP MP * 1 X

23 SCREW TAPTITE * 2 X

24 PMO-ADJUST END MP * 1 X

25 RING-E * 1 X

26 RING-CS * 1 X

< Rack-MPF Assembly Parts List >





5-7 Drive Assembly Exploded view

0

2

8 6 7

4

3

5

13 1

16

16

15

9

12

11 10

14



0 ELA UNIT-MOTOR JC96-02058A 1 O

1 MOTOR-STEP JC31-00010A 1 O

2 IPR-BRKT GEAR * 1 X

3 IPR-BRKT MOTOR * 1 X

4 GEAR-RDCN 145-70 * 1 X

5 GEAR-RDCN 90-24 * 1 X

6 GEAR-OPC DRV 135 * 1 X

7 GEAR-OPC DRIVE2 * 1 X

8 GEAR-FEED DRV * 1 X

9 GEAR-CLUTCH 56 * 1 X

10 GEAR-FUSER DRV23 * 1 X

11 PMO-CLUTCH LEVER * 2 X

12 SPRING-CLUTCH * 2 X


14 MPR-POLYWASHER 8 * 1 X


16 SCREW-MACHINE * 5 X

< Drive Assembly Parts List >






5-8 Pick-Up Assembly Exploded view

0

8 2

2

5

5

11

7

9

24 25

626

12 18

13

3

19

110

15

15

5

2

22

420

171610

21 5 2

14 23




0 MEA UNIT-FEEDER JC97-01324A 1 O

1 SCREW-TAPTITE * 1 X


3 SPRING-FEED(1) * 1 X

4 SPRING-FEED(2) * 1 X

5 BEARING-PICK UP * 4 X

6 GEAR-P/UP DRIVE * 1 X

7 GEAR-FEED * 1 X

8 GEAR-PICK UP(12) * 1 X

9 IPR-SHAFT FEED * 1 X

10 IPR-SHAFT FEED IDLER * 3 X

11 IPR-SHAFT PICK UP * 1 X

12 GROUND_FEED * 1 X

13 IPR-GUIDE_FEED * 1 X

14 PMO-HOUSING P/UP * 1 X

15 PMO-ROLLER FEED L * 2 X

16 PMO-ROLLER FEED S * 1 X

17 PMO-SUB HOLDER FEED * 1 X

18 PMO-FRAME_FEED * 1 X

19 PMO-HOLDER FEED(1) * 1 X

20 PMO-HOLDER FEED(2) * 1 X

21 PMO-IDLE PICK_UP * 1 X

22 PMO-ROLL_FEED, DRV 12 * 1 X

23 RMO-RUBBER PICK_UP * 1 X

24 RMO-LEVER PICK_UP * 1 X

25 SPRING PICK UP(12) * 1 X

26 RING-CS * 1 X

< Pick-Up Assembly Parts List >





5-9 Cassette Unit Exploded view

2

96

8

24

13 14

20

10

4

18

1

7

3

16

12

5

1719

11

21

0

15

25

22



< Cassette Unit Parts List >



0 MEA UNIT FEEDER CST (500) JC97-01323D 1 O 500 Sheets

1 PMO-COVER GUIDE EXT * 1 X

2 PMO-FRAME CASSETTE * 1 X

3 PMO-GUIDE EXT CST * 1 X

4 PMO-GUIDE PAPER * 1 X

5 PMO-GUIDE SIDE CST * 1 X

6 PMO-INDICATOR EMPTY * 1 X

7 PMO-SIDE GUIDE EXT * 1 X

8 PMO-SUB GUIDE CAST * 1 X

9 PMO-HOLDER_INDICATOR * 1 X

10 PMO-LOCKER PLATE * 1 X

11 IPR-FINGER * 1 X

12 IPR-GUIDE EXT LOCK * 1 X

13 IPR-GUIDE PAPER SCF * 1 X

14 IPR-GUIDE PLT PAPER * 2 X

15 IPR-PLATE KNOCK UP * 1 X

16 IPR-PLATE SPR LOCK * 1 X

17 IPR-SPR PLT G/SIDE * 1 X

18 SPRING PLATE K/UP 1 * 1 X

19 SPRING PLATE K/UP 2 * 1 X

20 SPRING LOCKER,PLATE * 1 X

21 RPR-PAD CST * 1 X

22 PMO GUIDE PAPER SIZE * 1 X

23 SCREW TAPTITE M3 x 10 NI * 7 X

24 LABEL(R)-CASSETTE * 1 X

25 GUIDE PAPER DUMMY * 1 X


1

Exploded Views and Parts Lists

0

13623

4

6

9

11

16

17

37

40

10

18

19

20

21

22

1941

23

5

7

37

8

14

15

34 35

31

30

29

28

27

25

24

26

29

2633

32

12

13

Second Cassette Exploded View (option/ML-1450S6)

Exploded Views and Parts Lists

2

Second Cassette Parts List (option)


Location No. Description SEC. Code Q'ty SA Remark

0 MEA ETC-CAST SCF,SEC HAWK16 JC97-01363D 1 X1 RPR-PAD FRICTION JC73-00058A 1 O2 PMO-FRAME PAD-SCF16 JC97-01474B 1 O3 SPRING-PAD JC61-70953A 1 X4 “PMO-GUIDE PAPER1 JC72-41201E 1 O5 IPR-KNOCK UP(SCF) JC70-11029A 1 O6 RPR-CORK KNOCKUP JC73-10947A 1 O7 LABEL(R)-INSTRUCT S JC68-30932C 1 X8 PMO-SUB GUIDE CASSETTE JC72-00460A 1 O9 PMO-GUIDE SIDE JC72-41205E 1 X10 SPRING-SCF K/UP JC61-70957A 1 X11 “PMO-DETECT PANEL JC72-41193F 1 X12 “LABEL(R)-HEIGHT JC68-30938D 1 X13 IPR-PLATE PAPER JC70-11047A 1 O14 PMO-LINK LEVER JC72-40968G 1 O15 “PMO-CASSETTE SCF JC72-41192E 1 O16 PCT-GUIDE PAPER FILM JC72-00579A 1 O17 PCT-GUIDE PAPER FILM JC72-00579A 1 X18 PMO-LEVER REAR JC72-41209F 1 O19 “SPRING-IDLE,SCF” JG61-70544A 3 X20 IPR-PLATE LEVER JC70-11030A 1 O21 “PMO-GUIDE REAR1 JC72-41202F 1 O22 “PMO-GUIDE REAR2 JC72-41203F 1 O23 PMO-GUIDE REAR3 JC72-41204E 1 X24 “SPRING-LOCKER,PLATE” JG61-70531A 1 O25 PMO-LOCKER PLATE JC72-41210A 1 O26 PMO-BUSH K/UP JC72-40961A 2 O27 PMO-ROLLER FD R JC72-41008A 1 O28 PMO-CAP PLATE K/UP JC72-40962A 1 O29 SPRING-SUB PLATE JC61-70919A 2 O30 PMO-LEVER PAPER S JC72-41341D 1 O31 SCREW-MACHINE 6001-000125 1 X32 IPR-SHAFT KNOCK UP JC70-00115A 1 O33 IPR-PLATE SUB K/UP JC70-10927A 1 O34 SPRING-SCF LEVER JC61-70956A 1 O35 RING-E 6044-000129 1 O36 RPR-PAD GUIDE P/U JC73-00061A O37 SCREW-TAPTITE 6003-000196 6 X38 PMO-HOLDER SHAFT JC72-00470A 1 O39 PCT-GUIDE PAPER FILM JC72-00579A 1 O40 “PMO-DUMMY ENV JC72-41282F 1 O41 PMO-GUIDE LOCK JC72-41200E 1 O


Block Diagram


6. Block Diagram

OSC.48 MHz

USBINTERFACE IC

(USBN9602)

USBINTERFACE

PARALLELINTERFACE

SPGPe(KS32C61100)OSC.

20MHz

POWERON RESET

PROGRAM ROM(FLASHMEMORY)

512K*16b*2EA

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)

RASCAS

MAMD

RCSRD

WR

IOCS

PLL

Reset & W D TGeneration

ROM/SRAM/FLASH ROM

Control(4 Bank)

I/OControl(5 Bank)

InterruptControl

(4 External)

Timer(3 CH)

ToneGenerator

EngineComm. I/F

RAM : 512B

G PIO

VIS

CPU B usIn te rf ace

Block

S yste rm BusInterface

B loc k[A rbite r]

EDO / FPMDRAMControl(4Bank)

A/D Bu s

CP

U A

ddr BU

S

CP

U D

ATA BU

S

Sys A

ddr BU

S

Sys D

ata BU

S

Sys C

ntl BU

S

ARM 7TDMICache 8KB

AD C

UA RT( 3 CH)

JB IG

RAM512B + 512B

OSC.(Video)53.0109277MHz

/CS,/RD ,/W R

NETWORKINTERFACE

(Option)

SYSTEM DATA BUS

SYSTEM ADDR. BUS

CPU DATA BUSCPU ADDR. BUS

I / OINTERFACE

74HC245*2EA

74LS273*3EA

THERM STORADC INPUT

THV READADC INPUT

[ COVER OPEN SWITCH ]

[ LASER DIODE ON/OFF SWITCH ]

SMPS

SUPPLY 5V to each ICS

24V

5V

24VS

SUPPLY 24V toMotor/HVPS/FAN/LSUA

Laser Diode Vccon LSU

LR AM :1296BC XRAM :256B

PANEL INTERCACE

MOTOR CONTROL

NV RAM INTERCACE

SENSORS INPUT

SOLENOID CONTROL

FAN/PTL CONTROL

SCF INTERFACE

FUSER CONTROL

HVPS CONTROL

LSU INTERFACE

G E U

P V C

P P I

HPVC

HCT

D M A C(2 CH)

Connection Diagram



SMPS

Controller

: Normal Connector

: Board on type Connector

RemarkSize /Empty /Feed/Manual Sensors are on B©d

Solenoid

MP Tray

(Option)1- 24VS2- MP_CL UT CH

1- /MP_EMPT Y2- GND_53- 5V

CN1

CN2

1- GND_52- GND_53- 5V4- 5V5- GND_2 46- GND_2 47- 24VS8- 24VS9- 24V10- 24V

HVPS

Micr o Sw itch on BoardIn- 24VOut- 24VS

CN1

CN1 4

PTL PT L Ct rl5V

CN3

CN2

1- 24VS2- GND_2 43- 5V4- GND_5 V5- THV _PWM6- THV RD7- /THV _EN8- /MHV _PWM9- /DEV_PWM10- PT L11- N.C.

12- N.C.

CN2

Thermistor

1- Ther m12- Ther m2

T herm1T herm2

Joint t ype

CN1 21- Save2- P_Nar r ow3- Empty4- Feed5- FA N6- Clutch7- Fuser8- MP_Clutch9- MP_Empty10- Motor _PA11- Motor _PB12- /Motor _PA13- /Motor _PB14- SCF_Cassete15- SCF_Motor16- SCF_Clutch17- SCF_Empty18- N.C.19- T herm220- T herm121- 5V22- EXT _Clo ck23,2 4- 5V25- 5V PS26,2 7,28- GND_5 V

CN8

CN3

Network I/F Card(Option)

1- N.C,. 2 - N.C., 3- 5V , 4- /IOCS3 , 5- D31 , 6- D30 ,

7- D2 9, 8- GND5, 9- D28, 10- D27, 11- D26 ,

12- GND5 ,13- D25, 14- D24 , 15- /EIRQ1, 16 - GND5,17- A 5, 18- A 4, 19- A3, 20- /EIRQ0,21- A2,22- D2 3,

23- D22, 24 - A17, 2 5- D21, 26- A16, 27- D20 ,

28- A 15, 29 - D19, 3 0- A 14, 31- D18, 32- A13 ,

33- D17, 34 - A12, 3 5- D16, 36- A11, 37- A6,

38- A 10, 39 - /RESET , 4 0- A 9, 4 1- /WA IT , 42 - A 8,43- / IOCS3, 44 - A7, 45 - / IOCS3, 4 6- N.C., 47- N.C.,

48- GND5 , 49- A1 8, 50- /RD, 51- /WE, 5 2- GND5,53- N.C., 54- N.C., 55 - /EIRQ1, 56- GND5, 5 7- N.C.,

58- 5V , 59 - 5V , 60 - 5V (60 pin Connector)

CN4

Micro- Switch(For LSU 5VS Cut )

1 - 5V2 - 5VS CN1 1

Panel B' d

LSU

1- 5V2- GND_53- LED14- LED25- LED36- LED47- Key 18- Key 2

1- /HSYNC2- 5V S3- GND_54- /LD_ON5- /VDO6- LSUPOWE

R1 2007- 24V S8- GND_2 49- P_MOT OR10- /LREA DY11- EXT _CL K

CN6

CN5

ExitSensor

1 - 5V2 - Exit_s ignal3 - GND_5

CN1 3

Motor

AC In- Let110V for USA220V for EU

Power Switch

SCF

(Option)

1- 5V

2- SCF_Sel Casset te

3- SCF_Motor4- SCF_CL UTCH5- SCF_Empty6- 24V S

7,8- GND_5

1- Moto_PA2- Motor _PB3- /Motor_PB4- Motor _PA

Heat Lamp (Fuser)

HOTNeut ral

HOTNeut ral

CN5

CN3

CN5 02

CN5 01

DC FAN1- FAN Cont rol2- N.C.3- 24V

CN5 03

1- 5V2- RXD3- TXD4- GND- 5V

CN1 0

DCU(For System Test )

Par allel Port36 PinHOST

(PC)

36PinP1284 Con.

CN8

USB Por t4 Pin 4Pin

USB Jack

CN7

Repair ManualRepair Manual

1. Block Diagram


3. Schematic Diagrams

CONTENTS

SAMSUNG LASER PRINTER

ML-1450Series ML-1450 / ML-1451N

Electronics

lee lee

Samsung Electronics Digital Printing CS Group

Copyright (c) 2002. 1

This manual is made and described centering around

circuit diagram and circuit description needed

in the repair center in the form of appendix.

SAMS

UNG

1BLOCK DIAGRAM

1. Block Diagram

OSC

.48

MHz

USB

INTE

RFAC

E IC

(USB

N960

2)

USB

INTE

RFAC

E

PARA

LLEL

INTE

RFAC

E

SPGP

e(K

S32C

6110

0)O

SC.

20M

Hz

POW

ERO

N RE

SET

PROG

RAM

ROM

(FLA

SHM

EMOR

Y)51

2K*1

6b*2

EA

FONT

ROM

(MAS

K RO

M)

512K

*16b

*2EA

DATA

ROM

(DRA

M)

1M*1

6b*2

EA

SIM

M(U

p to

64M

B)(O

ption

)

Post

Scrip

t 3(F

lash

: 2

MB

F

ont

: 2M

B)(O

ption

)

RAS

CAS

MA

MD

RCS

RD WR IO

CS

PLL

Rese

t &

W D

TG

ener

atio

n

ROM

/SRA

M/

FLAS

H R

OM

Cont

rol

(4 B

ank)

I/OCo

ntro

l(5

Ban

k)

Inte

rrupt

Cont

rol

(4 E

xter

nal)

Tim

er(3

CH)

Tone

Gen

erat

or

Engi

neCo

mm

. I/F

RAM

: 51

2B

GPI

O

VIS

CPU

Bus

Inte

rface

Bloc

k

Sys

term

Bus

Inte

rface

Blo

ck[A

rbite

r]

EDO

/ FP

MDR

AMCo

ntro

l(4

Bank

)

A/D

Bus

CPU Addr BUS

CPU DATA BUS

Sys Addr BUS

Sys Data BUS

Sys Cntl BUS

ARM

7TD

MI

Cac

he8K

B

ADC

UA

RT(3

CH)

JBIG

RAM

512B

+ 5

12B

OSC.

(Vid

eo)

53.0

1092

77M

Hz

/CS,

/RD

,/WR

NETW

ORK

INTE

RFAC

E(O

ptio

n)

SYST

EM D

ATA

BUS

SYST

EM A

DDR.

BUS

CPU

DAT

A B

USCP

U A

DDR.

BUS

I / O

INTE

RFAC

E

74HC

245*

2EA

74LS

273*

3EA

THER

M S

TOR

ADC

INPU

T

THV

REA

DAD

C IN

PUT

[ CO

VER

OPE

N SW

ITCH

]

[ LAS

ER D

IODE

ON/

OFF

SW

ITCH

]

SMPS

SUPP

LY 5

V to

eac

h IC

S

24V

5V

24VS

SUPP

LY 2

4V to

Mot

or/H

VPS/

FAN/

LSUA

Lase

r Di

ode

Vcc

on L

SU

LRAM

:129

6BC

XRAM

:256

B

PANE

L IN

TERC

ACE

MO

TOR

CO

NTRO

L

NV R

AM IN

TERC

ACE

SENS

ORS

INP

UT

SOLE

NOID

CO

NTRO

L

FAN/

PTL

CONT

ROL

SCF

INTE

RFAC

E

FUSE

R CO

NTRO

L

HVPS

CO

NTRO

L

LSU

INTE

RFAC

E

G E

U

P V

C

P P

I

HPVC

HCT

D M

A C

(2 C

H)

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2


CONNECTION DIAGRAM

Repair Manual


SMPS

Controller

: Normal Connector

: Board on type Connector

RemarkSize /Empty /Feed/Manual Sensors are on B©d

Solenoid

MP Tray

(Option)1- 24VS2- MP_CL UT CH

1- /MP_EMPT Y2- GND_53- 5V

CN1

CN2

1- GND_52- GND_53- 5V4- 5V5- GND_2 46- GND_2 47- 24VS8- 24VS9- 24V10- 24V

HVPS

Micr o Sw itch on BoardIn- 24VOut- 24VS

CN1

CN1 4

PTL PT L Ct rl5V

CN3

CN2

1- 24VS2- GND_2 43- 5V4- GND_5 V5- THV _PWM6- THV RD7- /THV _EN8- /MHV _PWM9- /DEV_PWM10- PT L11- N.C.

12- N.C.

CN2

Thermistor

1- Ther m12- Ther m2

T herm1T herm2

Joint t ype

CN1 21- Save2- P_Nar r ow3- Empty4- Feed5- FA N6- Clutch7- Fuser8- MP_Clutch9- MP_Empty10- Motor _PA11- Motor _PB12- /Motor _PA13- /Motor _PB14- SCF_Cassete15- SCF_Motor16- SCF_Clutch17- SCF_Empty18- N.C.19- T herm220- T herm121- 5V22- EXT _Clo ck23,2 4- 5V25- 5V PS26,2 7,28- GND_5 V

CN8

CN3

Network I/F Card(Option)

1- N.C,. 2 - N.C., 3- 5V , 4- /IOCS3 , 5- D31 , 6- D30 ,

7- D2 9, 8- GND5, 9- D28, 10- D27, 11- D26 ,

12- GND5 ,13- D25, 14- D24 , 15- /EIRQ1, 16 - GND5,17- A 5, 18- A 4, 19- A3, 20- /EIRQ0,21- A2,22- D2 3,

23- D22, 24 - A17, 2 5- D21, 26- A16, 27- D20 ,

28- A 15, 29 - D19, 3 0- A 14, 31- D18, 32- A13 ,

33- D17, 34 - A12, 3 5- D16, 36- A11, 37- A6,

38- A 10, 39 - /RESET , 4 0- A 9, 4 1- /WA IT , 42 - A 8,43- / IOCS3, 44 - A7, 45 - / IOCS3, 4 6- N.C., 47- N.C.,

48- GND5 , 49- A1 8, 50- /RD, 51- /WE, 5 2- GND5,53- N.C., 54- N.C., 55 - /EIRQ1, 56- GND5, 5 7- N.C.,

58- 5V , 59 - 5V , 60 - 5V (60 pin Connector)

CN4

Micro- Switch(For LSU 5VS Cut )

1 - 5V2 - 5VS CN1 1

Panel B' d

LSU

1- 5V2- GND_53- LED14- LED25- LED36- LED47- Key 18- Key 2

1- /HSYNC2- 5V S3- GND_54- /LD_ON5- /VDO6- LSUPOWE

R1 2007- 24V S8- GND_2 49- P_MOT OR10- /LREA DY11- EXT _CL K

CN6

CN5

ExitSensor

1 - 5V2 - Exit_s ignal3 - GND_5

CN1 3

Motor

AC In- Let110V for USA220V for EU

Power Switch

SCF

(Option)

1- 5V

2- SCF_Sel Casset te

3- SCF_Motor4- SCF_CL UTCH5- SCF_Empty6- 24V S

7,8- GND_5

1- Moto_PA2- Motor _PB3- /Motor_PB4- Motor _PA

Heat Lamp (Fuser)

HOTNeut ral

HOTNeut ral

CN5

CN3

CN5 02

CN5 01

DC FAN1- FAN Cont rol2- N.C.3- 24V

CN5 03

1- 5V2- RXD3- TXD4- GND- 5V

CN1 0

DCU(For System Test )

Par allel Port36 PinHOST

(PC)

36PinP1284 Con.

CN8

USB Por t4 Pin 4Pin

USB Jack

CN7

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3


SCHEMATIC DIAGRAMS

Repair Manual

3. Schematic Diagrams

3-1 Main Circuit Diagram (1/10)

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3-2

SCHEMATIC DIAGRAMS

Samsung ElectronicsRepair Manual

Main Circuit Diagram (2/10)

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SCHEMATIC DIAGRAMS

Repair Manual


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3-4

SCHEMATIC DIAGRAMS



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SCHEMATIC DIAGRAMS

Repair Manual


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3-6

SCHEMATIC DIAGRAMS



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SCHEMATIC DIAGRAMS

Repair Manual


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3-8

SCHEMATIC DIAGRAMS



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SCHEMATIC DIAGRAMS

Repair Manual


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3-10

SCHEMATIC DIAGRAMS



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SCHEMATIC DIAGRAMS

Repair Manual

3-2 Engine Circuit Diagram (1/2)

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3-12

SCHEMATIC DIAGRAMS


Engine Circuit Diagram (2/2)

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SCHEMATIC DIAGRAMS

Repair Manual

3-3 SMPS Circuit Diagram

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samsung ml-1440 ml-1450 repair service manual

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