SAMSUNG Ml85 Service Manual

2-4 Recommended Test Equipment

Samsung recommends the following equipment when servicing the Laser Printer.

Digital Multimeter A digital multimeter with attached LED or LCD 4-digit Panel. Oscilloscope A digitizing oscilloscope which can measure more than High Voltage probe DCU (Diagnostic Control Unit) DCU can be supplied from Samsung which can easily shows the engine’s

A high voltage probe which can measure about less than

Error status

Table 2-4-l Equipment List

QUIDCK

REFERANCE

STATUS

MAGNOSTIC

DIAGNOSTIC CONTROL

5PPM

LASER BEAM PRINTER

ON OFF

UNIC

1OOMHz

1OKV

DOWN SHIFT

Figure 241 DCU

ENTER

STOP

2-5 DCU Control

2-5-l DCU Setup

The DCU is used to diagnose Printer malfunctions. The DCU harness wire(lOpin-todpin) is connected to the Printer engine via:

1) Engine Board connector, CN2 (4pins)

2) (Video) Controller Board connector, 56 (4pins)

Open the Printer’s side cover(=SIMM Cover) and remove the shield cover and connect the DCU to connector 56 on the Controller Board.

2-5-2 DCU Error messages (LED Display)

If an error occurs, connect the DCU to the Printer. DCU messages will indicates malfunctioning areas of the machine.

(Consult Service Manual for detailed troubleshooting information)

Display

60 62 64 68 70 71 72 73 95

Error messages

OPEN FUSER ERROR LOW HEAT ERROR COVER OPEN ERROR OVERHEAT ERROR NO PAPER OR CASSETTE PAPER JAM1 (REGISTER SENSOR TO EXIT SENSOR) JAM2 (EXIT SENSOR TO FUSER) LSU NOT READY

JAM0

(CASSETTE PICK-UP TO REGISTER SENSOR)

2-5-3 DCU diagnostic messages (LED display)

After receiving an error message, use the DCU to locate malfunction unit.

Displav

1 2 3 4 5 6

8 9

Error messaee MAIN MOTOR OPERATING SYSTEM MAIN HIGH VOLTAGE ON (- 14KV) TRANSFER HIGH VOLTAGE THV

(+)

REFERENCE VOLTAGE

DEVSUPPLY HIGH VOLTAGE ON

LSU OPERATING TEST PICKUP CLUTCH ON PAPER EMPTY SENSOR TEST FEED & EXIT SENSOR TEST COVER OPEN SENSOR TEST FUSER TEST HOT BURN TEST CLEAN (MESSAGE) PRINT THV TRIGGER & THV ON DUTY THV PLUS DUTY

(-)

(+9OOV)

2-5-4 DCU Diagnostic Mode

1) Connect DCU to Controller or Engine Board

2) To apply power, simultaneously press tand hold ‘DOWN’, ‘SHIFT’, and ‘STOP’ keys. 78 will display

3) After 2-3 seconds, release the keys. 00 will display

4) Press ‘UP’ or ‘SHIFT+DOWN’ keys until the desired number is displayed in the DCU display.

5) Press ‘ENTER’ to begin operating.

6) Example

Select numbers 13 and 14 to adjust the electrophotography trigger voltage.

1: Turn power on by simultaneously pressing ‘DOWN’, ‘SHIFT’, and ‘STOP’ for 2-3 seconds.

2: Press

‘SHIFT+DOWN’

until diagnostic cocde

#14

is displayed. 4: Press ‘SHIFT’ and ‘STOP’ to exit routine. 5: Press ‘SHIFT’ and ‘DOWN’ to display diagnostic code

#13.

6: Display will antemate between electronc photography trigger voltage and On duty voltage. 7: To end operation, press ‘SHIFT’ and ‘STOP’ keys.

7) DCU Error Message

a) Error messgae

Error message Error message

‘60’,

‘THERMISTOR OPEN ERROR’

‘62’,

‘LOW TEMPERAURE ERROR’

‘68’,

‘OVERHEAT ERROR’

Action:

1) Measure Fuser’s Thermistor resistance Normal Thermistor resistance is 2-3 ohms (1

lOV),

6-10 ohms (220V)

2) Confirm Fuser Lamp operation

3) Measure Engine Board resistances at QlOl (Triac Thyrister)

4) Replace Engine Board Q 10 1

5) Replace Engine Board Q3 (KSC 1008-Y)

6) Replace Engine Board PC 15 1 (Triac Photo Coupler)

b) Error message

‘70’,

‘PAPER EMPTY’

Action:

1) Check for paper in cassete tray

2) Replace 0P2 Sensor (Photo Interrupter)

3) Confirm Feed Clutch operation (mode ‘06’)

4) Replace Feed Clutch or Engine Board’s 44 (KSC 1008-Y)

c) Error message ‘7

1’)

‘PAPER JAM- 1’

Action:

1) Check for paper in cassette tray

2) Check for Pick-up unit wear

3) Replace OP 1 sensor (Photo Intermpter)

d) Error message

Error message

‘72’,

‘PAPER JAM-2’

‘73’,

‘PAPER JAM-3’

Action:

1) Confirm that normal paper is being used

2) Check for Paper Jam in Fuser

3) Replace sensor ‘SW 1’ on Engine Board

4) Check for Fuser Roller contamination

8) Error message

‘95’,

‘LSU READY ERROR’

a) Confirm normal readings at Engine Boards, QS b) Replace LSU

(KSC1008-Y)

3. Product Information

3-1 Specifications

3-l -1 Engine(ML-80)

Specifications are correct at the time of printing. Product specifications are subject to change without notice.

1. Engme

3. Print Speed

Resolution Source Of Print Method Feed Method Feed Stde Paper Handling (input)

Paper Handling (output)

1 I

Feed

112.

Warm-up Time

113. Ftrst

114.

Print Time

Power

15. Power Consumption

Item

Ltght

Capactty

Rating

16.

Power Saving Consumption

r---

1 I7

Power Swatch

18.

Certification & Compliance

19.

Acoustic Standby

Noise

Operating

Specification & Description

VlL-80

Desktop Page Printer

ppm(page per minute) A4 Size, 5% Character Pattern)

frue

600 X 600 dpi(dot per inch)

,aser

Diode (LSU: Laser Scanner

\Jon-impact 3assette & Manual

side

Size

Electrophotography

Standard : A4, Letter, Legal, B5, Executive Envelope : manual feed only

Untt)

Universal type

Length : 150 - 356 mm

Width:

Weight : For Cassette, 60 - 90

Recommended Paper

90-216mm

For Manual, 60 -

120

g/in’

g/m’

USA: X420, X4024, NEKOSA, BOISE CASCADE EC: REFLEX, ADAGIO

Transparancies:

Label: AVERY 53XX series

:ace

Down :

Tace

Up : lsheet

3M (CG3300 or 3360)

150sheets

50-sheet Tray

!50-sheet Tray and one opttonal 250-sheet Drawer

3etween 25seconds

setween 25seconds \C

100-I

2OV/220-240V (*

15%) 50Hz/60Hz (+ 3%)

‘eak: 720W

luring

Printing :

luring

Sleeping

,ess

than 28W during I hour at first

Vane

3E,

TUV, SEMKO, NEMKO, DEMKO, C-tick,

FCC, UL,

Less than 29dB Less than 47dB

l50WH

(Average)

Max 1 SW

CSA, CDRH, CB,

MEEI

CClB

Remarks

Small Footprint

At Copy Mode

Left Adjust

ML-84/85G ML-84/85G plus

ML-85, ML-85 plus

For EPA

Class B for EMC

item

3. Reliability

Toner Supply

2. Expected Life Span

3. Operating Environment

Storage Environment

5. Weight

5. External Dimension

7. Print Cartridge

8. Packing

MPBJ MPBF MTBF

Main Kit

Specification & Description

2,500 pages/75g Paper 30,000 pages 2,250 hours (MTBF = Print Cartridge

100,OOOsheets

Temperature : 10 - 30

Humidity : 30 - 80 %RH Temperature : 0 - 35 Humidity : IO - 90 %RH Net : Max 9.3kg Gross : Max

ML-84/85G, QwikLaser 84/856

ML-85, QwikLaser 85

Ml-84

ML-85 plus

Life Span : 5,000 pages, 5% Pattern and 50% Duty Developing : Non-magnetic Contact Developing Charging : Conductive Roller Charging Density Adjustment : 3steps (Light, Medium, Dark)

Toner Supply Method Exchanging The Developer Toner Checking Sensor : None Transfer System: Conductive Roller Transfer Fusing System : Temperature & Pressure Erasing Method: Light Using LED Ozone Emission : Less than Printer Cassette Developer Cartridge1 Piece Guide Manual and Diskettes

Power Cord

7.5hours

10.5Kg

pIus/85G

X 20days X MPBF /Monthly Use)

“C

360(W) X 367(D) X 176(H) 360(W) X 367(D) X 188(H)

plus

Set

Piece

360(W) X 375(D) X 176(H) 360(W) X 367(D) X 188(H)

O.IPPM

Remarks

Jam Rate

For machine Normal:22 “C 65%

mm mm’ mm’ mm’

Negative(-) PWM Control

Quenching Lamp

33-l

3-l-2 ML-84, ML-84 plus or

Specifications are correct at the time of printing. Product specifications are subject to change without notice, And ML-84 plus has the new front cover.

QwikLaser

Item

Interface Engine Resolution

Emulation

Including the driver Font CPU

RAM MEMORY

ROM EEPROM Front Control Panel

0. Interface

Specification & Description

SAMSUNG ML-SO

WPS : 600 X 600 dpi PCL4.5 : 300 X 300 dpi PCL4.5 (Compatible with HP LaserJet IIP)

Mtcrosoft W

7 bitmaps Motorola MC68322-20MHz Standard : IM or Optional SIMM Module

* These SIMMs are compatible with the Computer’s,

Mbyte (Font + Program)

5 12bytes

4LEDs

Bidirectional Parallel Standard

IEEE1284 COMPATIBLE MODE

IEEE1284 NIBBLE MODE

IEEE1284 BYTE MODE

IEEE1284 ECP WITHOUT RLE

IEEE1284 ECP WITH RLE

PS(W

indows Printing System)

1.5M

bytes

For IM Standard : 4, I6 Mbytes

For

1.5M

Standard : 4, 16 Mbytes

key

Remarks

NVRAM

Centronics

Use ECP cable

I. Copy Capacity

2. Interface Switching

3. Interface Time Out

4. Jam Recovery

5 AEP

6. Engine Interface Error

7. Status Monitor

8. PRS Buffer

9. Top Margin

Serial Interface Optional

300,600,

57600, I1 5200 bps

XON/XOFF, DTR/DSR Protocol

Robust XON for XON/XOFF

Enable up to 999

Automatic (Serial & Parallel)

1 step is I second from 20 seconds to 5 minutes.

(Zero is disable)

Jam 0, 1, 2 according to the Jam position

The recopy of Jam 0, 1 is default. The recopy of Jam2 is optional. (Don’t use Jam2 recovery under WPS status.) Emulation switching according to Emulation code. All LEDs blink when communication is error Bidirectional Status Feedback Animation for printing 755Kbytes

4.23 f 2.0 mm

1200,2400,4800,9600,

19200,38400,

33-2

RS232C

WPS only

PC L Pattern

3-l-3 ML-85, ML-85 plus or

Specifications are correct at the time of printing. Product specifications are subject to change without notice And ML-85 plus has the new front cover.

QwikLaser

Item

Interface Engine Resolution Emulation

Including the driver

Font

CPU RAM MEMORY

ROM EEPROM Front Control Panel

0. Interface

SAMSUNG ML-80

WPS : 600 X 600 dpi

PCL5e (Compatible with HP LaserJet

Microsoft WPS(W indows Printing System)

bitmap 45 scalable (35 intelligent, 10 truetype) Motorola MC68322-20MHz Standard : 2Mbytes Option SIMM Module : 2, 4, 8, 16 Mbytes

* These SIMMs are compatible with the Computer’s,

2Mbyte (Font + Program) 5 12bytes

4LEDs &

Bidirectional Parallel Standard

IEEE1284 COMPATIBLE MODE

IEEE1284 NIBBLE MODE

IEEE1284 BYTE MODE

IEEE1284 ECP WITHOUT RLE

IEEE1284 ECP WITH RLE

Specification & Description

SP)

lkey

Remarks

NVRAM

Centronics

Use ECP cable

Copy Capacity

2. Interface Switching

3. Interface Time Out

4. Jam Recovery

5. AEP

6. Engine Interface Error

7. Status Monitor

8. PRS Buffer

9. Top Margin

Serial Interface Optional

300, 600,

57600, 115200 bps

XON/XOFF, DTR/DSR Protocol

Robust XON for XON/XOFF Enable up to 999 Automatic (Serial & Parallel)

1 step is 1 second from 20 seconds to 5 minutes. (Zero is disable) Jam 0, 1, 2 according to the Jam position The recopy of Jam 0, 1 is default.

The recopy of Jam2 is optional.

(Don’t use Jam2 recovery under W PS status.)

Emulation switching according to Emulation code.

All LEDs blink when communication is error

Bidirectional Status Feedback

Animation for printing

755Kbytes

4.23 * 2.0 mm

1200,2400,4800,9600,

19200, 38400,

RS-232C

WPS only

PCL Pattern

33-3

3-l-4 ML-85G, ML-85G plus or QwikLaser 85G

Specifications are correct at the time of printing. Product specifications are subject to change without notice. And ML-S% plus has the new front cover.

Item

Interface Engine

2. Resolution

3 Emulation

Including the

4. Font

5. CPU

6. RAM MEMORY

7 ROM 8

EEPROM(=NVRAM)

9 Front Control Panel

IO. Interface

I I

Copy Capacity

12.

Jam Recovery

13.

Engine Interface Error

14. Status Monitor

115.

PRS Buffer

drover

Specification & Description

SAMSUNG ML-SO

WPS : 600 X 600 dpi Computer 16Mbytes RAM : 300 X 300 dpi

PCL4

(Compatible with HP LaserJet II) Microsoft WPS(Windows Printing System) HP LaserJet II Internal fonts None (ASIC dependent on host computer) Standard :

None

ML-85G, ML-85G

QwikLaser 85G

ML-85G,

ML-85G

Bidirectional Parallel Standard

IEEE1284 COMPATIBLE MODE

IEEE1284 NIBBLE MODE

IEEE1284 BYTE MODE

IEEE1284 ECP WITHOUT RLE

IEEE Serial Interface : None Enable up to 999

Jam 0, I, 2 according to the Jam position

The recopy of Jam 0, I is default. The recopy of Jam2 is optional. (Don’t use Jam2 recovery under WPS status.) All Bidirectional Status Feedback Animation for printing 755Kbvtes

O.SMbytes

plus

QwikLaser 85G

plus

1284

ECP WITH RLE

LEDs

blink when communication is error

None

X24COl

5 4

LEDs LEDs

P only only

Remarks

S/W Driver

No option memory

POWER LED READY LED ON Centronics

Use ECP cable

WPS only

33-4

4-1. External Views and Functions

Face Down Tray

Control Panel

Each LED indicates printer status.

Manual Feeder

Cassette

Cover Open Button

Parallel Connector

It connects

parallel port

Computer

Facu

up Tray

Open Face up Tray and it will stacks one page.

Air Flow hole

Emits internal thermal air

5. Disassembly

5-l.

Controller Disassembly

Remove the SIMM cover. Push the tab down and pull the SIMM cover away from the printer.

Remove the two controller board.

ribboa

connectors on the video

Remove the screw in upper panel, then remove the panel to expose the video controller board.

left

comer of the metal

Pull the rear metal panel out and slowly slide the video

controller out of the LBP and put it on a flat surface.

5-2.

Cover Housing Disassembly

Remove the Drum unit, and place it in a place isolated from direct sunlight.

wire

panel

Locate and remove the two screws along the rear side of the printer.

Turn the printer’s front to you then lift the door and remove the two screws. If the printer has the Cleaning roller, there should be a connection between OUT of Cleaning board and IN of Cleaning roller.

From underneath the door, using your thumb, as shown, pull the hook to the left and then pull out the cap wire panel.

Remove the Panel PBA harness and locate it not to prevent you from working.

To remove the entire cabinet, release the hook that is near the bottom and towards the right front side of the cabinet. To do this, use both hands to elevate the front of the printer, push the frame lock inward while you

The cabinet also has a lock on the inlet side. Push the inlet inward and pull the cabinet upward. Gently pull the cabinet outward to release the lock as shown in the diagram.

pull the cabinet outward.

53. Fuser Disassembly

If you have not already done so, remove the printer

Disconnect the thermistor wire and the heater wire.

cabinet.

Remove the two screws holding the SMPS Shield and

lift the shield up and away from the SMPS.

AC wire

\ thermistor wire

Remove the four screws holding the fkser assembly and pull it away from the printer.

Fuser Assembly.

Release the lock holding the actuator and lift one end of the actuator and then the other end up and away from

Remove the screw at the end of the f&er assembly and pull the right electrode off the fuser assembly.

the fuser assembly.

Gently, pull the lamp out of the heat roller.

Remove the two screws around the thermostat as

shown in the diagram. Lift the thermostat out of the f&er assembly and left electrode.

Upper Fuser Frame

Lower Fuser Frame

Remove the four screws holding the upper and lower fuser frame together.

Gear Exit-Laud

Pull the upper and lower

fker

frames apart.

Pull off and reserve the gear exit-land the CS ring.

Pull the heat roller up and out of the upper fuser

fkame.

Remove the

firser

gear from the right end and the

bearings from each end of the heat roller.

Gently lift the spring lock point to release the thermistor assembly Corn the underside of the upper

fuser frame.

Locate the two exit rollers on the underside of the

Locate and remove the three guide claws and springs.

upper Iuser Came. Gently lift the sprint lock points and remove the exit rollers.

Pressure Roller

Lift the pressure roller up and out of the lower

fi-ame

assembly.

fuser

Remove the two pressure roller bearings and their springs.

Remove the gear exit from the end of the pressure roller. Remove the left bearing exit Roller and right bearing exit roller.

5-4.

Gear Bracket Disassembly

Along the power inlet side of the printer, locate and remove the seven screws which hold the gear bracket assembly on the printer.

Detach the motor harness from the

Gear Bracket Assy

M&or Bracket

-_)

PM.

Remove the three screws holding the motor bracket to

the gear bracket assembly and pull the motor away.

Pull up on the gears individually to remove them.

Remove the two screws on the motor bracket to separate the motor

from

the motor bracket.

On the gear train, remove the belt pulley and CS ring to remove the

impella.

Other gears on the gear train have

permanently welded gear locks.

The OPC Ground can be removed after taking off the gear bracket.

5-5. LSU Disassemblv

Remove the three screws holding the LSU in the lower part of the printer.

Detach the 5-pin scanner motor wire then while you detach the 6-pin LD wire.

lift

the LSU

5-6.

Shaft-Exit Disassembly

If you have not already done so, remove the ICU Shield.

Release

the exit bearing on both sides of the exit shaft.

Roller

Holder exit face down

exht

Lift the exit shaft up and away from the printer.

Locate and remove the face down exit spring, face down exit holder and exit roller.

5-7. Top Cover Disassembly

If you have not already done so, remove the printer cabinet and cap wire panel. Working on the underside of the top cover, release the spring hook lever and remove the hook lever.

C/O

B&on

To remove the top cover from the cabinet, remove the four screws holding the two spring-C/OS.

Pull out the C/O shaft and separate the top cover Tom

the cabinet.

Remove the C/O button by pressing in the hook and

pulling the button and its spring out of the cabinet.

+ 60 hidden pages