Samsung ML-1451N, ML-1450 Service Manual

SERVICE

LASER PRINTER

ML-1450 SERIES ML-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

Printed 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”

- This Service Manual is a property of Sam sung Electronics Co.,Ltd. Any unauthorized use of Ma nual can be punished under a pplicable

International and/or domestic law. -

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

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 ampere.

10. Do not allow anything to rest on the power cord or

data communications cable.

11. Unplug this printer from the wall outlet before clean-

ing. 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 pro-

longed 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.

Precautions

1-1

Samsung 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 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 0.3mW±0.03mW

CAUTION

VORSICHT

ATTENTION

ATTENZIONE

PRECAUCION

CAUTION : Avoid exposure to invisible laser radiation when the

development unit is not installed.

INVISIBLE LASER RADIATION WHEN THIS COVER OPEN. DO NOT OPEN THIS COVER.

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

REYONNEMENT LASER INVISIBLE EN CAS D’OUVERTURE. EXPOSITION DANGERUSE AU FAISCEAU.

RADIAZIONE LASER INVISIBLE IN CASO DI APERTURA. EVITARE L’ESPOSIZONE LAFASCIO.

REDIACION LASER INVISIBLE CUANDO SE ABRE. EVITAR EXPONERSE AL RAYO.

Precautions

1-2

Samsung Electronics

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.

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 compo-

nents.

6. Be careful that small parts such as screws should not get in the printer.

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

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.

Precautions

1-3

Samsung Electronics

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 Laser printer supplied by Samsung Electronics.

DVM(Digital Volt Meter)

Standard: Indicates more than 3 digits.

Electronic Scale

Standard: Equipment to check the weight of consumables(toner cartridge) supplied by Samsung Electronics. (The gram unit can be measured.)

Driver

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

Pinset

Standard: For general home use, small type.

Cotton Swab

Standard: For general home use, for medical ser-

vice.

Cleaning Equipments a IPA(Isopropyl Alcohol)dry cloth or a soft stuff neutral detergent.

Software(Driver) installation CD ROM

Mind your hands not to be touched when you disassemble and reassemble PBAASS'Y , such as the main board, SMPS, HVPS.

Note

Specifications

2-1

Samsung Electronics

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, connecting

method, media type, media size and job complexity.

** Sound Pressure Level, ISO 7779

Specifications

2-2

Samsung Electronics

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

3-1Samsung Electronics

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.

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.

Disassembly and Reassembly

3-2 Samsung Electronics

1. Open the printer cover.

2. Remove the cap.

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

3-2 Transfer Roller

Disassembly and Reassembly

3-3Samsung Electronics

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.

3-3 Controller Board

Disassembly and Reassembly

3-4 Samsung Electronics

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

2. Remove three screws from the left base bracket, and take 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 heavily worn, replace it with a new one.

3-4 Pickup Assembly

Push the solenoid if you have difficulty to remove the pickup assembly.

Squeeze this tab to remove the rubber.

Disassembly and Reassembly

3-5Samsung Electronics

1. Remove two screws and remove the controller board.

2. Remove two screws at the back of the printer and unplug one connector from the board, then open the rear 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 switch and the power connecter are properly released when you remove the cover.

Disassembly and Reassembly

3-6 Samsung Electronics

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)

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

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

4. If you want to remove the exit roller, sqeeze the bottom

of the roller and take it out.

Disassembly and Reassembly

3-7Samsung Electronics

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.

Disassembly and Reassembly

3-8 Samsung Electronics

3-10 Drive Assembly

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

-Main Cover (see page 3-5)

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.

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

4. Remove the motor assembly. Remove two screws securing the motor to the motor bracket, then take the motor out.

Disassembly and Reassembly

3-9Samsung Electronics

3-11 Fan

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

-Main Cover (see page 3-5)

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

3-12 Solenoid

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

-Main Cover (see page 3-5)

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

Disassembly and Reassembly

3-10 Samsung Electronics

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

-Main Cover (see page 3-5)

2. Remove four screws and unplug one connector, and then 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 three holders, and then take the thermistor out.

To remove the halogen lamp from the fuser assembly :

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

Note: When you reassemble the halogen lamp, make

sure that it is inserted into the slot properly.

3-13 Fuser Assembly

Disassembly and Reassembly

3-11Samsung Electronics

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 remove two screws securing the BRKT gear fuser and take the gear fuser out.

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

4. Remove two screws and take the holder brush

ant out.

4. Remove the heat roller.

To remove the pressure roller from the fuser assembly :

Remove the roller.

pressure roller

BRKT gear fuser

CS-ring

Holder brush ant

Disassembly and Reassembly

3-12 Samsung Electronics

3-14 Guide Feed & PTL Lamp

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

-Main Cover (see page 3-5)

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

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

4. Remove the guide feed.

PTL lamp

Disassembly and Reassembly

3-13Samsung Electronics

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

-Main Cover (see page 3-5)

2. Unplug two connectors and remove five screws, and then 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 of arrow to release the nockup plate.

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

plate .

3. Remove the nockup plate.

e-ring

Disassembly and Reassembly

3-14 Samsung Electronics

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

Disassembly and Reassembly

3-15Samsung Electronics

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

-Main Cover (see page 3-5)

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

3. Remove eight screws securing the PCU shield and remove two screws securing the SCF connector, and then 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, and remove the shield.

3-16 Engine Board and Miscellaneous

Disassembly and Reassembly

3-16 Samsung Electronics

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 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 ends of the sensor.

Actuator empty

Disassembly and Reassembly

3-17Samsung Electronics

To replace the actuator feed

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

2. Turn the unit over again, and remove the actuator feed.

To remove the transfer guide :

Remove three screws and take the guide out.

Troubleshooting

4-1

Samsung Electronics

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 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)

4-5 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)

4-6 The cause and solutions of bad environment

of 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

4-2

Samsung Electronics

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 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

4-3

Samsung Electronics

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 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.

05 LSU Operating System

The scanning motor of LSU is in operation, the right LED of the three buttons on. Press the [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is normal, all LEDs are on.

06 Pickup clutch on

The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together.

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/OFF

Paper Empty Sensor (SCF) ON/OFF 2nd LED ON/OFF Paper Empty Sensor (MP) ON/OFF 3rd LED ON/OFF Increment 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

4-4

Samsung Electronics

13 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.

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/OFF

Cassette Sensor 2 ON/OFF 2nd LED ON/OFF Cassette Sensor 3 ON/OFF 3rd LED ON/OFF Increment 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 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

LSULSU

CARTRIDGECARTRIDGE

MPF

PICK UP

OPC

FEED

IDLE

EMPTY SEN

FEED SENFEED SEN

PTL

FUSERFUSER

FACE DOWN

FACE UPFACE UP

H/R

Pr/R

SCF

CASSETTE

EXIT SEN

EXIT1EXIT1

EXIT2

OUT BIN FULL SEN

+ 67 hidden pages