Samsung ML-1650 Service Manual

SERVICE

LASER PRINTER

ML-1650Series

ML-1650 / ML-1651N

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

Read each caution carefully:

1. Do not use this printer near water or when exposed to inclement weather.

2. Do not place this printer on an unstable cart, stand or table; the product may fall, causing serious damage to the product.

3. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation and to protect the printer from ever heating, do not block or cover any of these openings. Do not place the printer in an enclosure unless the enclosure provides adequate ventilation.

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

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

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

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

8. Operate this printer using the power source (110V, 220V, etc) indicated on the marking label. If you are not sure of the type of power source available, consult your dealer or local power company.

9. If you need to use an extension power cord with this printer, make sure that it uses a three-wire grounded cord and that the total ampere ratings for all of the products using the extension do not exceed the extension cord ampere rating. Also, make sure that the total of all products plugged into the wall outlet does not exceed 15 amperes.

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

data communications cable.

11. Unplug this printer from the wall outlet before 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

1-1 Safety Precautions

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

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 STRAHLAUSSETZEN.

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 components.

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

Ground

17 PPM(Letter) , 16PPM(A4)

1200 * 1200 Tray 1 : Less than 14 seconds Tray 2 : Less than 17 seconds

Less than 40 seconds

Print : 300 W, Sleep mode : Less than 20 W

361 x 409 x 294.5 mm

12.4 Kg/27.3lb (SET)

Stand by : Less than 35 dB, Operating : Less than 49dB

AC 100~127V , 50 Hz AC 220~240V , 60 Hz

Power PC (166 MHz)

Standard : 16Mbyte

Option DIMM Module ; 16, 32,64,128M byte

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

512 bytes

PCL6, PS 3(Option)

IEEE1284, USB, Network

Windows 95/98/2000/Me/NT,

Linux(Radhat 6.0 ↑), iMac(Mac OS 8.0 ↑)

Option Default

550 sheets (75g/m2) 100 sheets (75g/m2)

20 sheets (OHP)

10 sheets (Letter, card)

25 sheets (Label)

250 sheets 100 sheets

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

#10, DL, C5, C6, B5

Single Cartridge 8,000 sheets (Set : 4,000 sheets) 8,000 sheets (Set : 4,000 sheets)

60,000 sheets 60,000 sheets

125,000 sheets

40,000 sheets

3Key, 4LEDs

YES

YES(Button)

Specifications

2-1

Samsung Electronics

2. Specifications

Speed Resolution First Print Time

Warm-Up T ime Power Consump. Dimension(W * D * H) Weight Acoustic Noice Power Rating

Processor Memory

Emulation Interface OS Support

N/W Input

Output

Media Type

Type Life Cartridge Pick up Roller Feed Roller Transfer Roller Fuser Key & LED LCD Toner Save Reprint

RAM

ROM EEPROM

Cassette MP Tray

Face down Face up

Engine

Controller

Paper

T oner

User interface

ML-1650 ML-1651N

Specifications

2-2

Samsung Electronics

10 ~32˚c (50˚F ~ 90˚F) 20 ~ 80 % RH

-200 ~40˚c (4˚F ~ 104˚F) 10 ~90 % RH Windows 95/98 and Windows NT (3.51, 4.x ) Netware (3.x, 4.x), NDS and Bindery Mode /RPRINT, PSERVER Mode UNIX and Apple Talk 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 Ethernet 10/100 BaseTX (Auto Negotiation) 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 management (can manage NPC and printer options on Web Browser)

Operation Environment

Storage Environment

Network Operating Systems

Network Protocols Supported

Network Card Interface Network Management S/W

Temperature Humidity Temperature Humidity

Environment

Network

ML-1650 ML-1651N

Disassembly and Reassembly

3-1

Samsung Electronics

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.

3-1 General Precautions on Disassembly

3. Disassembly and Reassembly

1. Open the printer cover.

2. Remove the cap.

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

Disassembly and Reassembly

3-2

Samsung Electronics

3-2 Transfer Roller

Disassembly and Reassembly

3-3

Samsung Electronics

1. Remove two screws and remove the controller cover.

2. Remove five screws securing the board and unplug all connectors, and then take the controller board out of the printer.

3-3 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, 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.

Disassembly and Reassembly

3-4

Samsung Electronics

Squeeze this tab to remove the rubber.

3-4 Pickup Assembly

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

Disassembly and Reassembly

3-5

Samsung Electronics

1. Remove two screws and remove the controller cover.

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.

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, squeeze

the bottom of the roller and take it out.

Disassembly and Reassembly

3-6

Samsung Electronics

1. Before you remove the MP tray, you should

remove:

-Main Cover (see page 3-5)

2. Remove the stoppers securing the MP tray.

3-6 MP (Multi-Purpose) Tray

3-7 Exit Assembly

Disassembly and Reassembly

3-7

Samsung Electronics

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

-Main Cover (see page 3-5)

-Exit assembly (see page 3-7)

2. Remove five screws, and remove the LSU. Then unplug two connectors from the LSU.

3-8 LSU

1. Before you remove the HVPS board, you

should remove:

-Main Cover (see page 3-5)

2. Remove four screws and take the HVPS

board out.

3-9 HVPS board

Disassembly and Reassembly

3-8

Samsung Electronics

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

-Main Cover (see page 3-5)

2. Remove two screws securing the connector cover and harness bracket from the gear bracket.

3. Remove one screw, and remove the fan. Then unplug one connector.

3-10 Fan

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.

3-11 Solenoid

Disassembly and Reassembly

3-9

Samsung Electronics

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

-Main Cover (see page 3-5)

-Fan (see page 3-9)

2. Remove four 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 assembly from the drive assembly, remove five screws securing the motor assembly to the gear bracket.

4. If you want to remove the step motor, remove four screws securing the step motor from the motor bracket and unplug two connector from the motor.

5. If you want to remove the motor joint PCB, remove two screws securing the motor joint PCB from the gear bracket and unplug one connector from the motor joint PCB.

3-12 Drive Assembly

Disassembly and Reassembly

3-10

Samsung Electronics

1. Before you remove the fuser, you should remov

-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

3-11

Samsung Electronics

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

-Main Cover (see page 3-5)

2. Release the latches on the erase lamp from the MPF ASS’Y and unplug one connector, then remove the PTL.

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

4. Remove the guide feed& erase PTL.

3-14 Guide Feed & Erase Lamp

Disassembly and Reassembly

3-12

Samsung 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.

♦ 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.

3-15 MPF Assembly and Miscellaneous on MPF Assembly

Disassembly and Reassembly

3-13

Samsung Electronics

♦ To replace the Paper Empty (PE) sensor :

1. Release the wire from the two holders.

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

♦ To replace the pickup holder and the Adjust

End MP:

1. Remove two screws and remove the MPT bracket.

2. Unlatch the PE sensor, then take it out.

3. Remove the pickup holder.

4. Remove the Adjust End MP

Disassembly and Reassembly

3-14

Samsung 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 bracket 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

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