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User Manual: ML2850

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DIGITAL LASER PRINTER
ML-2850 Series
ML-2850D / ML-2851ND
ML-2851ND/SEE
Basic Model : ML-2851ND

SERVICE
DIGITAL LASER PRINTER

Manual

The keynote of Product
Smallest Duplex Built-in
Mono Laser Printer (Low Noise)
- 28ppm(A4) / 30ppm(Ltr)
- PCL6, PS3, 1,200x1,200dpi
- 400MHz processor
- USB 2.0, N/W (ML-2851ND only)
- 32MB (Max.160MB : factory option)
- 2K Standard, 5K High Yield
- Paper Input: 250 sh CST + 1 sh MP
- Standard Duplex Printing
- Options: 250 sh SCF

ML-2850D

GSPN (Global Service Partner Network)
North America : service.samsungportal.com
Latin America : latin.samsungportal.com
CIS : cis.samsungportal.com
Europe : europe.samsungportal.com
China : china.samsungportal.com
Asia : asia.samsungportal.com
Mideast & Africa : mea.samsungportal.com

Samsung Electronics Co.,Ltd. Aug. 2007
Printed in Korea.
VERSION NO. : 1.00
CODE : 2851-D0SEE

Contents

1. Precautions
1.1 Safety Warning
1.2 Caution for safety
1.3 ESD Precautions

1-1
1-2
1-5

2. Product spec and feature
2.1 Product Specifications
2.1.1 Product Overview
2.1.2 Specifications
2.1.3 Model Comparison Table
2.2 Summary of Product
2.2.1 Printer Components
2.2.2 System Layout
2.2.3 Engine H/W Specifications
2.2.4 S/W Descriptions

2-1
2-1
2-1
2-7
2-9
2-9
2-12
2-17
2-27

3. Disassembly and Reassembly
3.1 General Precautions on Disassembly
3.2 Used Screw List
3.3 Cover Unit
3.3.1 CASSETTE & Front Cover
3.3.2 DUPLEX UNIT & COVER-TOP/COVER-REAR
3.3.3 Cover-Side-LEFT/RIGHT
3.4 Fuser Ass'y
3.5 LSU(Laser Scanning Unit)
3.6 Drive Ass'y
3.7 Main PBA/SMPS/HVPS
3.8 HOLDER-PAD Disassembly

3-1
3-2
3-3
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10

Continued

3.9 Transfer Roller

3-11

4. Alignment & Troubleshooting
4.1 Alignment and Adjustments
4-1
4-1
4.1.1 Sample Pattern
4-4
4.1.2 Control Panel
4-7
4.1.3 Consumables and Replacement Parts
4-7
4.1.4 LED Status Error Message
4-8
4.1.5 Abnormal Image Printing and Defective Roller
4-9
4.1.6 How to use DCU
4-15
4.1.7 Paper Jam
4-20
4.1.8 Download & Reset F/W
4-21
4.2 Troubleshooting
4-21
4.2.1 Procedure of Checking the Symptoms
4-22
4.2.2 The cause and solution of Bad image
4-38
4.2.3 The cause and solution of the bad discharge
4-46
4.2.4 The cause and solution of the malfunction
4-56
4.2.5 Toner Cartridge Service
4.2.6 The cause and solutions of bad environment of the software 4-58

5. Exploded Views & Parts List
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8

Main
Top Cover
Cover Ass'y
Front Cover
Rear Cover
Frame
Main Drive
Rear Guide

5-2
5-4
5-6
5-8
5-10
5-12
5-17
5-19

Continued

5.9 Fuser
5.10 Duplex Unit
5.11 Cassette
5.12 SCF

5-21
5-23
5-25
5-27

6. System Diagram
6.1 Block Diagram
6.2 Connection Dia ram

6-1
6-2

7. Reference Information
7.1 Tool for Troubleshooting
7.2 Acronyms and Abbreviations
7.3 Select a location for the printer
7.4 Sample Tests Patterns
7.5 LAN (Optional Function)
7.6 Information of model's code
7.7 Parts Life Cycle Maintenance Table
7.7.1 Parts Life Cycle Maintenance Table
7.7.2 Toner Cartridge Criterion
7.8 Model Information
7.8.1 Understanding for Model Code
7.8.2 Understanding Material Code & Name

7-1
7-2
7-4
7-5
7-6
7-6
7-7
7-7
7-7
7-8
7-8
7-9

Precautions

1. Precautions
In order to prevent accidents and to prevent damage to the equipment please read the precautions listed
below carefully before servicing the printer and follow them closely.

1.1 Safety Warning
(1) Only to be serviced by appropriately qualified service engineers.
High voltages and lasers inside this product are dangerous. This printer should only be serviced by a suitably
trained and qualified service engineer.
(2) Use only Samsung replacement parts
There are no user serviceable parts inside the printer. Do not make any unauthorized changes or
additions to the printer, these could cause the printer to malfunction and create electric shock or fire hazards.
(3) Laser Safety Statement
The Printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter J for
Class 1(1) laser products, and elsewhere, it is certified as a Class I laser product
conforming to the requirements of IEC 825. Class I laser products are not considered to be hazardous. The
laser system and printer are designed so there is never any human access to laser radiation above a Class I
level during normal operation, user maintenance, or prescribed service condition.
Warning >> Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The
reflected beam, although invisible, can damage your eyes. When using this product, these basic safety
pre-cautions should always be followed to reduce risk of fire, electric shock, and injury to persons.

CAUTION - INVISIBLE LASER RADIATION
WHEN THIS COVER OPEN.
DO NOT OPEN THIS COVER.
VORSICHT - UNSICHTBARE LASERSTRAHLUNG,
WENN ABDECKUNG GEÖFFNET.
NICHT DEM STRAHL AUSSETZEN.
ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS
D’OUVERTURE. EXPOSITION DANGEREUSE
AU FAISCEAU.
ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI
APERTURA. EVITARE L’ESPOSIZIONE AL
FASCIO.
PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE.
EVITAR EXPONERSE AL RAYO.
ADVARSEL. - USYNLIG LASERSTRÅLNING VED ÅBNING, NÅR
SIKKERHEDSBRYDERE ER UDE AF FUNKTION.
UNDGÅ UDSAETTELSE FOR STRÅLNING.
ADVARSEL. - USYNLIG LASERSTRÅLNING NÅR DEKSEL
ÅPNES. STIRR IKKE INN I STRÅLEN.
UNNGÅ EKSPONERING FOR STRÅLEN.
VARNING - OSYNLIG LASERSTRÅLNING NÄR DENNA DEL
ÄR ÖPPNAD OCH SPÄRREN ÄR URKOPPLAD.
BETRAKTA EJ STRÅLEN. STRÅLEN ÄR FARLIG.
VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA
OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN.

Service Manual

1-1

Samsung Electronics

Precautions

1.2 Caution for safety
1.2.1 Toxic material
This product contains toxic materials that could cause illness if ingested.
(1) If the LCD control panel is damaged it is possible for the liquid inside to leak. This liquid is toxic. Contact with the skin
should be avoided, wash any splashes from eyes or skin immediately and contact your doctor. If the liquid gets into
the mouth or is swallowed see a doctor immediately.
(2) Please keep toner cartridges away from children. The toner powder contained in the toner cartridge may be harmful
and if swallowed you should contact a doctor.

1.2.2 Electric Shock and Fire Safety Precautions
Failure to follow the following instructions could cause electric shock or potentially cause a fire.
(1) Use only the correct voltage, failure to do so could damage the printer and potentially cause a fire or electric
shock.
(2) Use only the power cable supplied with the printer. Use of an incorrectly specified cable could cause the cable
to overheat and potentially cause a fire.
(3) Do not overload the power socket, this could lead to overheating of the cables inside the wall and could lead to
a fire.
(4) Do not allow water or other liquids to spill into the printer, this can cause electric shock. Do not allow paper
clips, pins or other foreign objects to fall into the printer these could cause a short circuit leading to an electric
shock or fire hazard..
(5) Never touch the plugs on either end of the power cable with wet hands, this can cause electric shock. When
servicing the printer remove the power plug from the wall socket.
(6) Use caution when inserting or removing the power connector. The power connector must be inserted completely otherwise a poor contact could cause overheating possibly leading to a fire. When removing the power
connector grip it firmly and pull.
(7) Take care of the power cable. Do not allow it to become twisted, bent sharply round corners or other wise
damaged. Do not place objects on top of the power cable. If the power cable is damaged it could overheat and
cause a fire or exposed cables could cause an electric shock. Replace a damaged power cable immediately,
do not reuse or repair the damaged cable. Some chemicals can attack the coating on the power cable,
weakening the cover or exposing cables causing fire and shock risks.
(8) Ensure that the power sockets and plugs are not cracked or broken in any way. Any such defects should be
repaired immediately. Take care not to cut or damage the power cable or plugs when moving the machine.
(9) Use caution during thunder or lightening storms. Samsung recommends that this machine be disconnected
from the power source when such weather conditions are expected. Do not touch the machine or the power
cord if it is still connected to the wall socket in these weather conditions.
(10) Avoid damp or dusty areas, install the printer in a clean well ventilated location. Do not position the machine
near a humidifier. Damp and dust build up inside the machine can lead to overheating and cause a fire.
(11) Do not position the printer in direct sunlight. This will cause the temperature inside the printer to rise possibly
leading to the printer failing to work properly and in extreme conditions could lead to a fire.
(12) Do not insert any metal objects into the machine through the ventilator fan or other part of the casing, it could
make contact with a high voltage conductor inside the machine and cause an electric shock.

Service Manual

1-2

Samsung Electronics

Precautions

1.2.3 Handling Precautions
The following instructions are for your own personal safety, to avoid injury and so as not to damage the printer
(1) Ensure the printer is installed on a level surface, capable of supporting its weight. Failure to do so could cause
the printer to tip or fall.
(2) The printer contains many rollers, gears and fans. Take great care to ensure that you do not catch your fingers,
hair or clothing in any of these rotating devices.
(3) Do not place any small metal objects, containers of water, chemicals or other liquids close to the printer which if
spilled could get into the machine and cause damage or a shock or fire hazard.
(4) Do not install the machine in areas with high dust or moisture levels, beside on open window or close to a
humidifier or heater. Damage could be caused to the printer in such areas.
(5) Do not place candles, burning cigarettes, etc on the printer, These could cause a fire.

1.2.4 Assembly / Disassembly Precautions
Replace parts carefully, always use Samsung parts. Take care to note the exact location of parts and also
cable routing before dismantling any part of the machine. Ensure all parts and cables are replaced correctly.
Please carry out the following procedures before dismantling the printer or replacing any parts.
(1) Check the contents of the machine memory and make a note of any user settings. These will be erased if the
mainboard or network card is replaced.
(2) Ensure that power is disconnected before servicing or replacing any electrical parts.
(3) Disconnect printer interface cables and power cables.
(4) Only use approved spare parts. Ensure that part number, product name, any voltage, current or temperature
rating are correct.
(5) When removing or re-fitting any parts do not use excessive force, especially when fitting screws into plastic.
(6) Take care not to drop any small parts into the machine.

Service Manual

1-3

Samsung Electronics

Precautions

1.2.5 Disregarding this warning may cause bodily injury
(1) Be careful with the high temperature part.
The fuser unit works at a high temperature. Use caution when working on the printer. Wait for the fuser to cool
down before disassembly.
(2) Do not put finger or hair into the rotating parts.
When operating a printer, do not put hand or hair into the rotating parts (Paper feeding entrance, motor, fan,
etc.). If do, you can get harm.
(3) When you move the printer.
This printer weighs 7.87kg. Use safe lifting and handling techniques. Use the lifting handles located on each
side of the machine. Back injury could be caused if you do not lift carefully.

17.35 Ibs.
7.87 Kg
(4) Ensure the printer is installed safely.
The printer weighs 7.87Kg, ensure the printer is installed on a level surface, capable of supporting its weight.
Failure to do so could cause the printer to tip or fall possibly causing personal injury or damaging the printer.
(5) Do not install the printer on a sloping or unstable surface. After installation, double check that the printer is stable.

Service Manual

1-4

Samsung Electronics

Precautions

1.3 ESD Precautions
Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly called
“Electrostatically Sensitive (ES) Devices”, or ESDs. Examples of typical ESDs are: integrated circuits, some field
effect transistors, and semiconductor “chip” components.
The techniques outlined below should be followed to help reduce the incidence of component damage caused by
static electricity.

Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known earth ground. Alternatively, employ a commercially available wrist strap device, which should be removed for your personal safety reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface, such as
aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity of the assembly.
3. Use only a grounded tip soldering iron to solder or desolder ESDs.
4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static” can
generate electrical charges sufficient to damage ESDs.
5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to damage ESDs.
6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a comparable conductive material.
7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.
8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed, until completely plugged or soldered into the circuit.
9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the brushing
together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electricity sufficient to
damage an ESD.

Service Manual

1-5

Samsung Electronics

Product spec and feature

2. Product specification and feature
2.1 Product Specifications
2.1.1 Product Overview

2K Standard, 5K High Yield

28ppm(A4) / 30ppm(Ltr)
PCL6, PS3, 1,200x1,200dpi

ML-2850D/2851ND

Paper Input: 250 CST + 1 MP
Standard Duplex Printing
(World Smallest)

400MHz processor
USB 2.0, N/W (ML-2851ND only)

Options:
- 250 sh SCF

32MB (Max.160MB : option)

2.1.2 Specifications
Product Specifications are subject to change without notice. See below for product specifications.

2.1.2.1 General Print Engine
ITEM

ML-2850D

ML-2851ND

Simplex

Up to 28 ppm in A4 (30 ppm in Letter)

Duplex

Up to 14 ipm in A4 (14.5 ipm in Letter)

Warmup time

From Sleep

15 sec

FPOT

From Ready

8.5 sec

From Sleep

less than 23.5 sec

Up to 1,200 x 1,200 dpi effective output

Engine Speed

Resolution

Service Manual

2-1

Samsung Electronics

Product spec and feature

2.1.2.2 Controller & S/W
ITEM

ML-2850D

ML-2851ND

Processor

Samsung 400 MHz

Memory

Std.

32 MB

Max.

160MB(option)

Printer Languages

PostScript3, PCL6, SPL, IBM ProPrinter,
EPSON

Fonts

45 scalable, 1 bitmap, 136 PostScript3 fonts 45 scalable, 1 bitmap, 136 PostScript3 fonts

Driver

Default Driver

SPL

Install

SPL, PCL6, PS3

Supporting OS

Windows 2000/XP(32/64bits)/Vista(32/
64bits)/2003 Server(32/64bits)

Various Linux OS:
- Red Hat 8~9,
- Fedora Core 1~4
- Mandrake 9.2~10.1
- SuSE 8.2~9.2

Mac OS 8.6~9.2 / 10.1~10.4

WHQL

Windows 2000, XP, 2003 Server,
Vista(32/64bits)

Compatibility

SPL & PCL6 : Win 2000/XP(32/64bits)/
2003 server/Vista(32/64bits)
PS3: Win 2000/XP(32/64bits)/
Vista(32/64bits)/
2003 PPD, Mac PPD, Linux PPD

Protocol

N/A

SPX/IPX, TCP/IP, Ethertalk, SNMP, HTTP 1.1

Supporting OS

N/A

Windows NT4.0/2000/XP(32/64bits)/2003
Server/Vista(32/64bits)NetWare 5.x, 6.x
Mac OS 8.6~9.2, 10.1~10.4
Various Linux OS including Red Hat 8~9,
Fedora Core 1~4, Mandrake 9.2~10.1, and
SuSE 8.2~9.2Unix HP-UX

Protocol

N/A

Supporting OS

N/A

Smart Panel

SmartPanel for Windows/ Macintosh/LINUX SmartPanel for Windows/ Macintosh/LINUX

Printer Setting

PSU for Windows/ Macintosh/LINUX

Network Management

N/A

SyncThru Web Admin Service 4.0

IP Setting

N/A

SetIP

Parallel

N/A

USB

Hi-Speed USB 2.0

Wired Network

N/A

Ethernet 10/100 Base TX (Internal)

Wireless Network

N/A

LCD

N/A

LED

2 LED, 1 Key

Key

1 Key (Demo, Stop)

Wired Network

Wireless Network
Application

Interface

User Interface

Service Manual

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Samsung Electronics

Product spec and feature

2.1.2.3 Paper Handling
ITEM

ML-2850D

ML-2851ND

Standard Capacity

250-sheet Cassette Tray, 1-sheet Multi
Purpose Tray @80g/

Max. Capacity
Printing

Max. Size

501 sheets @ 80g/
216 x 356 mm (8.5" x 14")

Min. Size

76 x 127 mm (3.0" x 5.0")

Capacity

Plain Paper

1 sheets @ 80g/

Media sizes

Envelope
-

1 sheets @75g/
A4, A5, A6, Letter, Legal, Folio, Oficio,
Executive,ISO B5, JIS B5, 3"x5", Monarch,
No.10, DL, C5, C6

Media type

Plain Paper, Transparency, Envelope,
Labels, Post Card, Card stock

Media weight
Sensing

16~43lb (60 to 163g/ )
N/A

250 sheets @ 80g/
A4, A5, Letter, Legal, Executive, Folio,
Oficio, ISO B5, JIS B5

Multi-purpose tray

Standard Cassette Tray
Capacity
Media sizes

Media types

Plain paper

Media weight
Sensing

16~28lb (60 to 105g/ )
Paper empty sensor

Optional Cassette Tray
Capacity
Media sizes

250 sheets @ 80g/
A4, A5, Letter, Legal, Executive, Folio,
Oficio, ISO B5, JIS B5

Media types

Plain paper

Media weight
Sensing

16~28lb (60 to 105g/ )
Paper empty sensor

Capacity

Face-Down

150 sheets @ 75g/

Face-Up

N/A

Output Full sensing

N/A

Output Stacking

Duplex
Supporting

Built-in

Media sizes

A4, Letter, Legal, Folio, Oficio

Media types

Plain Paper

Media weight
Printable Area

20~24lb (75 to 90g/ )

Non-Printable Area

Envelope

10mm(0.4") from edge(Top, Bottom, Left,
Right)

Other Media

4mm(0.16") from edge(Top, Bottom, Left,
Right)

Service Manual

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Samsung Electronics

Product spec and feature

2.1.2.4 Consumables
ITEM
Toner

Drum

ML-2850D

ML-2851ND

Black

Standard: Average Cartridge Yield 2K
standard pages.
High Yield: Average cartridge Yield 5K
standard pages.
Declared cartridge yield in accordance with
ISO/IEC 19752.

Key

Electronic key(CRUM) Only

Life detect

Toner gauge sensor by dot count

Yield

N/A

2.1.2.5 Reliability & Service
ITEM

ML-2850D

ML-2851ND

Max. Monthly Duty

50,000 sheets

MPBF

35,000 sheets

MTTR

30 min.

SET Life Cycle

100,000 sheets or 5 years
(whichever comes first)

RDS

Comm. Mode

Yes

Operation

Yes

2.1.2.6 Environment
ITEM
Operating

Temperature

ML-2850D

ML-2851ND

10C to 32C

Environment

Humidity

20% to 80%

Acoustic Noise

Printing

Less than 50dBA

Level(Sound

Standby

Less than 26.0 dBA

Power/Pressure)

Sleep

Back Ground Level

Power Consumption

Ready

Less than 60W

AVG.

Less than 400W

Sleep / Power Off

Less than 8W / Less than 0.4W
(Conformity to EPA)

Dimension
(W x D x H)

SET

364 x 369 x 209.6 mm
(14.33" x 14.523" x 8.25 ")

Weight

SET

7.87 Kg

Service Manual

2-4

Samsung Electronics

Product spec and feature

2.1.2.7 Packing & Accessory
ITEM
In-Box

ML-2850D
-

ML-2851ND

Driver & Network Install CD-ROM
Power Cable
USB Cable (CIS/China/Korea/India)
Quick Install Guide
Warranty Registration Card
User's Manual (PDF File)

2.1.2.8 Options
ITEM

ML-2850D

ML-2851ND

Option (128MB)

Memory

Option (128MB)

Second Cassette

250-sheet Cassette Tray

Wired Network

N/A

N/A (Built-in)

Wireless Network

N/A

Hard Disk

N/A

Duplex Unit

Standard

Upgradable Mem. Slot

N/A

Upgradable Mem. Type

N/A

2.1.2.9 Others
ITEM
Memory

ML-2850D

ML-2851ND

Upgradable Mem. Unit

128MB(option)

Paper Empty

YES

Paper Size

Media Type

Paper Full

Service

Service Item & Period

1. Transfer Roller : 50K pages
2. Fuser Unit : 50K pages
3. Pick-up Roller : 50K pages

Certification

Power

FCC Part 15 Class B
ICES-003
EN55022 Class B

Performance

Jam Rate

Base Line Paper : 1/5K

Standard Paper : 1/2.5K

Stress Paper : 1/1500

Sensor

Service Manual

Speed

Be equal or better than E250DN

Resolution

Be equal or better than E250DN

2-5

Samsung Electronics

Product spec and feature

2.1.2.10 Reliability & Service

* Periodic Replacing Parts

No.No.

Parts Parts

Code
Code

Transfer Roller

JC66-01218A

50,000

Pick -up Roller

JC97-03062A

50,000

Fuser Unit

JC96-04717A(220V)
JC96-04718A(110V)

50,000

Service Manual

Fig.

2-6

Yield (pages)

Samsung Electronics

Product spec and feature

2.1.3 Model Comparison Table
2.1.3.1 SEC Model

Samsung

ML-2851ND

ML-2250

Print Speed

28 ppm/A4

20 ppm/A4

Resolution

1,200 dpi class

600 dpi class

Processor

400 MHz

166 MHz

32 MB (160 MB)

16 MB (144 MB)

Emulation

PCL6, PS3

PCL6

Interface

USB 2.0, N/W

USB 2.0, N/W IEEE1284

Paper Input

150 CST

FPOT (C/M)

30 sec/8.5 sec

50 sec/10 sec

Noise

50 dBA

51 dBA

Toner

2K/5K

3K/5K

364 x 369 x 209.6mm

358 x 452 x 278mm

250 SCF, Memory (factory option)

250 SCF, Memory

Image

Memory (Max.)

Dim. (WDH)
Options

Service Manual

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Samsung Electronics

Product spec and feature

2.1.3.2 Competitor Model
Samsung
ML-2851ND

Brother
HL-5240

Lexmark
E250D

Print Speed

28 ppm/A4

30 ppm/Ltr

Resolution

1,200 dpi class

600 x 600 dpi

Processor

400 MHz

264 MHz

300 MHz

32 MB (160 MB)

16 MB (16 MB)

64 MB (576 MB)

Emulation

PCL6,PS3

Interface

USB 2.0, N/W

Paper Input

250 CST

250 OT

250 CST

FPOT (C/M)

30 sec/8.5 sec

20 sec

N/A

Noise

50 dBA

47 dBA

N/A

Toner

2K/5K

2K/2.5K

1K/2K

364 x 369 x 209.6mm

407 x 453 x 370mm

420 x 424 x 432mm

250 SCF,
Memory (factory option)

250 SCF

250/500 SCF,
Memory

Image

Memory (Max.)

Dim. (WDH)
Options

Service Manual

2-8

Samsung Electronics

Product spec and feature

2.2 Summary of Product
This chapter describes the functions and operating principal of the main component.

2.2.1 Printer Components
2.2.1.1 Front View

* The figure above shows an ML-2851ND.

output tray

tray 1

control panel

optional tray 2

control board cover

paper level indicator

front cover

output support

manual tray

manual tray paper width guides

Service Manual

2-9

Samsung Electronics

Product spec and feature

2.2.1.2 Rear View

* The figure above shows an ML-2851ND.

network port a

duplex unit

USB port

power receptacle

optional tray 2 cable connector

power switch

a. ML-2851ND only.

Service Manual

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Samsung Electronics

Product spec and feature

2.2.1.3 Control Panel

Error: Indicates the status of your printer.

Online: Indicates the status of your printer.

Cancel: Prints a demo page or configuration page.
Cancels the print job.
Makes the printer pick up the print media.

Service Manual

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Samsung Electronics

Product spec and feature

2.2.2 System Layout

LSU

DEVE

FUSER
DUPLEX

CASSETTE

Service Manual

2-12

Samsung Electronics

Product spec and feature

2.2.2.1 Feeding
It is consists of a basic cassette, an MP tray for supplying different types of media (envelope, label, special paper) duplex unit, and parts related to paper transferring.

1) Separation method
Separate it from the friction pad mounted to the center of the cassette.

2) Basic cassette
It takes a center loading method and applies 'friction pad separating method.'
Both the side guide and the rear guide can be adjusted for for various types of papers from A5 to
legal size paper.
It has a paper existence sensing function (Capacity: 250 sheets of general paper), paper arranging
function, various size papers accepting function, SCF paper path function, and displaying function
of paper remaining amount.
In the front side, there is a paper level indicator.

3) Pick-up roller
It has functions such as a paper pickup function, driving control function, paper feeding function,
and removing electronic static function.

4) Registration roller
It has a paper arranging function, paper transferring function, paper detecting function, jam removing function, and so on.

5) MP tray
It has a paper arranging function, paper transferring function, jam removing function, and so on.
It uses rubbing pad method to feed 1 sheets of general papers and 1 envelops.

6) Duplex unit
It has paper transferring function, paper guide function, jam removing function, paper sensing function, and main board supporting function.
It is designed for basic attachment, and the duplex feeding takes a side feeding method. Usable
papers are A4, letter, and legal size paper.
For removing a jam occurred in a front part, it is designed to open a cassette and a guide.
It is designed to open a rear cover to remove a jam in a rear part.

7) SCF (Second Cassette Feeder)
It is the same method with the main cassette, and the capacity is 250 sheets.
It has a separate driving mechanism. It is designed for a common use with a main cassette.

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Product spec and feature

2.2.2.2 Transfer
A transfer roller transfers toner on an OPC drum to the paper.
Life span: Print over 50,000 sheets (In 16~27 )

2.2.2.3 Driver Ass'y
By driving the motor, the system takes power. It consists of a main motor for feeding fuser and duplex
reverse turn.
- Main Motor : DC 24V, Rated RPM : 2170rpm

2.2.2.4 Fuser
It is consisted of a heat lamp, heat roller, pressure roller, thermistor and thermostat. It sticks the toner on a
paper by heat and pressure to complete the printing job.
- Halogen lamp : 750 Watt 5%

1) Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over-heating.
- Non-Cotact type Thermostat

2) Heat roller
The heat roller transfers the heat from the lamp to apply a heat on the paper. The surface of a heat roller is
coated with Teflon, so toner does not stick to the surface.

3) Pressure roller
A pressure roller mounted under a heat roller is made of a silicon resin, and the surface also is coated with
Teflon. When a paper passes between a heat roller and a pressure roller, toner adheres to the surface of a
paper permanently.

4) Items for safety
Protecting device for overheating
- 1st protection device: Hardware cuts off when overheated
- 2nd protection device: Software cuts off when overheated
- 3rd protection device: Thermostat cuts off main power.
Safety device
- A fuser power is cut off when a front cover is opened
- Maintain a temperature of fuser cover's surface under 80(C for user, and attach a caution label at where
customer can see easily when customer open a rear cover.

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Product spec and feature

2.2.2.5 LSU (Laser Scanner Unit)
It is the core part of the LBP which switches from the video data received to the controller to the electrostatic latent image on the OPC drum by controlling laser beam, exposing OPC drum, and turning principle
of polygon mirror. The OPC drum is turned with the paper feeding speed. The /HSYNC signal is created
when the laser beam from LSU reaches the end of the polygon mirror, and the signal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on paper. In other
words, after the /HSYNC signal is detected, the image data is sent to the LSU to adjust the left margin on
paper. The one side of the polygon mirror is one line for scanning.

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Product spec and feature

2.2.2.6 Print Cartridge
By using the electronic photo process, it creates a visual image. In the print cartridge, the OPC unit and
the toner cartridge unit are in a body. The OPC unit has OPC drum and charging roller, and the toner
cartridge unit has toner, supply roller, developing roller, and blade (Doctor blade)
- Developing Method: Non-contacting method
- Toner : Non magnetic 1 component pulverized type toner
- The life span of toner : 2,000 or 5,000 pages (LSA Pattern/A4 standard)
- Toner remaining amount detecting sensor : Yes
- OPC Cleaning : Cleaning blade type
- Management of disusable toner : Collect the toner by using Cleaning Blade
- OPC Drum protecting Shutter : No
- Classifying device for toner cartridge : ID is classified by CRUM. except for initial cartridge.

2 Cleaning Roller
0.32mW
4
-

-1.25KV ~ -1.45KV

-750V
-130V

+
-250V

8 Cleaning Blade

3
6

VD = -430V
5
VS = -680V

+4.2kV

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Product spec and feature

2.2.3 Engine H/W Specifications
2.2.3.1 Main Board
The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and print part in
functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC interface. The main board
sends the Current Image of Video data to the LSU and manages the conduct of Electrophotography for printing. It is
consisted of the circuits of the motor (paper feed, pass) driving, clutch driving, pre-transfer lamp driving, current driving,
and fan driving.
The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main board.

HVPS
HVPS CN4
CN4
(( 24V
24V :: 13
13 14
14
24VS
24VS :: 99 10
10 ))

SDRA
SDRA
M
M
U6,
U6, U7
U7
Network
Network
Interface
Interface &
& IC
IC

EEPRO
EEPRO
M
M
U3,
U3, U4
U4

USB
USB
Port
Port &
&
IC
IC

SMPS
SMPS CN10
CN10
(( 24V
24V :: 44 66 88 10
10
5V
5V :: 12
12 14
14 16
16 ))
ASIC
ASIC
U8
U8

NOR
NOR Flash
Flash
U17,
U17, U18
U18

DC
DC to
to DC
DC
Converter
Converter
(3.3V)
(3.3V) U15
U15
DC
DC to
to DC
DC
Converter
Converter
(1.3V)
(1.3V) U5
U5

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Product spec and feature

2.2.3.1(a) Asic(SPGPv3)
CPU Core : ARM1020E
- 32KB instruction cache and 32KB data cache
Operating Frequency
- CPU Core : over 300MHz
- System Bus : 100MHz
SDRAMC
- 32Bits Only, 100MHz
- 5 Banks (Up to 128MB per Bank)
ROMC
- 4 Banks (Up to 16MB per Bank)
IOC
- 6 Banks (Up to 16MB per Bank
DMAC
- 4 Channels
HPVC
- Dual/Single Beam
- LVDS Pad(VDO, HSYNC)
UART
- 5 Channels (1 Channels Supports DMA Operation)
PCI Controller
- 32Bits, 33/66MHz
- PCI Local Bus Specification rev2.2 Complaint
- Host / Agent Mode (Support 4 Devices in Host Mode)
NAND Flash Controller
- 8/16Bits, H/W EEC Generation
- Auto Boot Mode (Using Internal SRAM, 4KB)
MAC
- 10M/100Mbps
- Full IEEE 802.3 Compatibility
Engine Controller
- LSU Interface Unit
- Step Motor : 2 Channels
- PWM : 8 Channels
- ADC : 6 Channels
I2C Controller
- I2C(S-BUS) Slave Device Support(I2C Version 2.1)
RTC
- RTC Core Voltage : 3V
PLL
- 3 PLL : MAIN, PCI, PVC
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Product spec and feature

2.2.3.1(b) Memory
Flash Memory : It stores System Program and downloads the System Program through PC Interface, and in case of
model for export it compresses the PCL font, then stores it.
- Capacity : 16M Byte (NOR Flash)
- Random Access Time : 10 us (Max)
- Serial Page Access Time : 50ns (Min)
DRAM : It is used as Swath Buffer, System Working Memory Area, etc. when printing.
It stores Font List, compressed into Flash memory, on DRAM and uses it as PCL font in case of model for export.
- Capacity : 32M Byte(Basic), up to 160Mbyte (Factory Option)
- Type : SDRAM 100MHz/133MHz , 32bit

2.2.3.1(c) Sensor Input Circuit
Paper Empty Sensing
The Paper empty sensor (Photo Interrupter) on the HVPS informs the state of paper to CPU whether it is empty or not
with operation of the actuator.
When cassette is empty, it detects the fact by reading the E20 of CPU, and then informs the fact by displaying the RED.
Paper Feeding/With Toner Cartridge Sensing
When paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the paper feeding
state to CPU, and then sprays the image data after certain time.
If it doesn t detect the feed sensor within 1sec. after paper is fed, paper Jam0 is occurred (LED will be display Orange
color). The fact whether the developer is inserted or not is detected by CRUM. After the developer is mounted, the subCRUM can read the information of toner cartridge from contact with CRUM involved in toner cartridge. If the information
of toner cartridge is invalid, it will show invalid sign on LED.
Paper Exit Sensing
It detects paper state whether paper gets out from the set with operation of exit sensor on the HVPS and actuator on the
frame. Paper detects the on/off time of exit sensor by reading D22 of CPU, and the normal operation or jam information
is informed to the CPU.
The paper JAM2 is informed. (LED will be display Orange color)
Cover Open Sensing
The Cover open sensor is located on the HVPS. After the front cover is opened, +24VS (DC fan, Solenoid, Main Motor,
Polygon motor part of LSU and HVPS), which is supplied to the each unit, is cut off. The cover-open sensing is operated
by the D23 of CPU.
In case, the red will be ON for informing the facts to user.
DC FAN / SOLENOID Driving
It is driven by transistor and controlled by D14(FAN MAIN), E16(FAN DUPLEX), C23(PICK-UP CLUTCH), C18(REGI
CLUTCH), D15(MPF CLUTCH) of CPU.
When it is high, the fan is driving by turning on the TR, and it is off when the sleep mode is selected. There are three
solenoids, and they are driven by paper pick-up, regi and MPF signal. It is turned on or off by C23, C18, D15 of CPU.
The diode protects the driving TR from the noise pulse, which is flown when the solenoid id de-energizing.
FAN Driving Circuit is driven by Transistor, and controlled by D14, E16 of CPU.

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Product spec and feature

Motor Driving
The main motor driving circuits is on the BLDC Motor Ass y Unit. Main Controller has the interfacing circuits. There is
motor driver IC on the motor control board of Motor Ass y Unit.
The exit motor driving circuits is formed when the driver IC is selected. The AN44060A Motor Driver IC is used in this
case. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. The motor driving voltage is calculated with the following formula.
IN 0, 2
L
H
L
H

IN 1, 3
L
L
H
H

Output Current
Vref / (10*Rs) = Iout
Vref / (15*Rs) = Iout * 2/3
Vref / (30*Rs) = Iout * 1/3
0

The motor driving circuit is formed when the Driver IC is selected. The A3977 Motor Driver IC is used in this case. The
resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value.
The motor driving voltage is calculated with the following formula.
I = Vref / Rs, wherein Vref is (R1 5V) / (R1+R2).

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Product spec and feature

2.2.3.2 SMPS & HVPS board
The SMPS supplies DC Power to the System.
It takes 110V/220V and outputs the +5V, +24V to supply the power to the main board. The HVPS board creates the high
voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making best condition to display the image.
The HVPS part takes the 24V and outputs the high voltage for THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller.

2.2.3.2(a) HVPS (High Voltage Power Supply)
Transfer High Voltage (THV+)
- Input Voltage : 24 V DC 15%
- Output Voltage : MAX +5.0KV 5 %,(Duty Variable, no loading )
->1.2KV 15% (when cleaning,200 )
- Output Voltage Trigger : 6.5
- Input contrast of the Voltage stability degree :under 5 % (fluctuating input 21.6V 26.4V)
Loading contrast : 5 % or less
- Output Voltage Rising Time : 100 ms Max
- Output Voltage Falling Time : 100 ms Max
- Fluctuating transfer voltage with environmental various : +650 V(Duty 10%) ~ 5 KV (Duty 90%)
- Environment Recognition Control Method : The THV-PWM ACTIVE is transfer active signal. It detects the resistance
by recognizing the voltage value, F/B, while permits the environmental recognition voltage.
- Output Voltage Control Method : Transfer Output Voltage is outputted and controlled by changing Duty of THVPWM
Signal. 10% Duty : +650V, 90% Duty : +5KV 5%
Charge Voltage (MHV)
- Input Voltage : 24 V DC 15%
- Output Voltage : -1.3KV ~ -1.8KV DC 50V
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 30 M ~ 1000 M
- Output Control Signal(MHV-PWM) : CPU is HV output when PWM is Low
Cleaning Voltage (THV-)
- The (+) Transfer Voltage is not outputted because the THV PWM is controlled with high.
- The (-) Transfer Voltage is outputted because the THV-Enable Signal is controlled with low
- The output fluctuation range is big because there is no Feedback control.
Developing Voltage (DEV)
- Input Voltage : 24 V DC 15%
- Output Voltage: -200V ~ -600V DC 20 V
- Output Voltage Fluctuation range: PWM Control
- Input contrast of the output stability degree : 5 % or less
Loading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10M ~ 1000 M
- Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low.

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Product spec and feature

Supply
- Output Voltage : -400 V ~ -800V DC 50 V(ZENER using, DEV )
- Input contrast of the output stability degree : under 5 %
Loading contrast : 5 % or less
- Output Voltage Rising Time : 50 ms Max
- Output Voltage Falling Time : 50 ms Max
- Output Loading range : 10 M ~ 1000 M
- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.

CN1
CN1
(Main
(Main PBA
PBA CON.)
CON.)

SW2
SW2
(( Rear-Cover
Rear-Cover
Open
Open Switch
Switch ))

SW1
SW1
(( Front
Front-Cover
-Cover
Open
Open Switch
Switch ))
MHV
MHV
DEV
DEV
OPC
OPC
SUPPLY
SUPPLY
THV
THV

VARISTOR
VARISTOR

2.2.3.2(b) SMPS (Switching Mode Power Supply)
It is the power source of entire system. It is assembled by an independent module, so it is possible to use for common
use. It is mounted at the side of the set.
It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater control part,
which supplies the power to fuser. SMPS has two output channels. Which are +5V and +24V.
AC Input
- Input Rated Voltage : AC 220V ~ 240V AC 110V ~ 127V
- Input Voltage fluctuating range : AC 198V ~ 264V AC 99V ~ 135V
- Rated Frequency : 50/60 Hz
- Frequency Fluctuating range : 47 ~ 63 Hz
- Input Current : Under 4.0Arms / 2.0Arms (But, the status when e-coil is off or rated voltage is inputted/outputted )

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Product spec and feature

ITEM

CH1

CH2

Remark

CHANNEL NAME

+5V

+24.0V

CONNECTOR PIN

CON 35V PIN: 11,13,15
GND PIN: 12,14,16

CON 324V PIN:3,5,7,9
GND PIN:4,6,8,10

Rated Output

+5V 5%(4.75 5.25V)

+24V 10%(21.6 26.4V)

Max. Output Current

4.4 A

Peak Loading Current

3.6 A

5.3 A

RIPPLE NOISEVoltage

100mVp-p

Under 500mVp-p

Maximum output

15W

105.6W

Peak output

18W

127.2W

Protection for loading
shortage and
overflowing current

Shut down or Fuse
Protection

Shut down or Output
Voltage Drop

ITEM

System

Stand-By

Less than 60W

PRINTING

Less than 400W

Sleep-Mode

Less than 8W

1ms

F01
F01
220V
220V :: 250V
250V 8A
8A
110V
110V :: 250V
250V 10A
10A

SW2
SW2

CON1
CON1
(AC
(AC POWER
POWER
CON.)
CON.)

CON2
CON2
(Main
(Main PBA
PBA CON.)
CON.)
24V
24V :: 33 55 77 99
5V
5V :: 11
11 13
13 15
15

CON1
CON1
(Heat
(Heat Lamp
Lamp CON.)
CON.)
F02
F02
250V
250V 3.15A
3.15A

Service Manual

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F71
250V
250V 4A
4A

2-23

F72
F72
250V
250V 4A
4A

Samsung Electronics

Product spec and feature

Length of Power Cord : 1830 50mm
Power Switch : Use
Feature
- Insulating Resistance : 100 or more (at DC 500V)
- Withstanding Voltage : Must be no problem within 1 min.
(at 1000V-LV model / 1500Vac-HV model,10mA)
- Leaking Current : under 3.5mA
- Running Current : under 40A PEAK (AT 25 , COLD START)
under 60A PEAK (In other conditions)
- Rising Time : within 2Sec
- Falling Time : over 20ms
- Surge : Bi-Wave 3kV - Normal, 6KV - Common
Environment Condition
- Operating temperature range : 0
40
- Maintaining temperature range : -25
85
- Preserving Humidity Condition : 30% 90% RH
- Operating atmospheric pressure range : 1atm
EMI Requirement : CISPR ,FCC, CE, MIC, C-Tick,
Safty Requrement :IEC950 UL1950, CSA950, C-UL,NOM, TUV, Semko, Nemko, iK, CB, CCC(CCIB), GOST, EPA,
Power Save

2.2.3.2(c) FUSER AC POWER CONTROL
Fuser(e-coil) gets heat from AC power. The AV power controls the switch with the Triac, a semiconductor switch. The
ON/OFF control is operated when the gate of the Triac is turned on/off by Phototriac (insulting part).
In other words, the AC control part is passive circuit, so it turns the heater on/off with taking signal from engine control
part.
When the HEATER ON signal is turned on at engine, the LED of PC501 (Photo Triac) takes the voltage and flashes.
From the flashing light, the Triac part (light receiving part) takes the voltage, and the voltage is supplied to the gate of
Triac and flows into the Triac. As a result, the AC current flows in the e-coil, and heat is occurred.
On the other hand, when the signal is off, the PC501 is off, the voltage is cut off at the gate of Triac, the Triac becomes
off, and then the e-coil is turned off.
Triac (Q501) feature : 24A-LV model / 16A-HV model, 600V SWITCHING
Phototriac Coupler (PC501)
- Turn On If Current : 15mA 50mA(Design: 16mA)
- High Repetive Peak Off State Voltage : Min 600V

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Product spec and feature

2.2.3.3 Engine F/W
2.2.3.3(a) Control Algorithm
• Feeding
If feeding from a cassette, the drive of the pickup roller is controlled by controlling the solenoid. The on/off of the
solenoid is controlled by controlling the general output port or the external output port. If feeding from a manual
feeder, decide to insert the paper according to the operation of the Regi sensor, and by driving the main motor,
insert the paper in front of the feed sensor. While paper moves, occurrence of Jam is judged as below.
ITEM

JAM 0

Description
- After picking up, paper cannot be entered due to paper is not fed.
- After picking up, paper entered but it cannot reach to the feed sensor in certain time due to slip, etc.
- After picking up, if the feed sensor is not on, re-pick up. After re-picking up, if the feed sensor is
not on after certain time, it is JAM 0.
* It is a status that the leading edge of the paper doesn’t pass the feed sensor.

- Even though the paper reaches to the feed sensor, the feed sensor doesn’t be ON.
* It is a status that the leading edge of the paper already passes the feed sensor.

JAM 1

- After the leading edge of the paper passes the feed sensor, the trailing edge of the paper cannot
pass the feed sensor after a certain time. (The feed sensor cannot be OFF)
- After the leading edge of the paper passes the feed sensor, the paper cannot reach the exit sensor after certain time. (The exit sensor cannot be ON)
* The paper exists between the feed sensor and the exit sensor.

JAM 2

- After the trailing edge of the paper passes the feed sensor, the paper cannot pass the exit sensor
after certain time.

DUPLEX
JAM 1

- After the trailing edge of the paper passes the exit sensor, the leading edge of the paper cannot
reach the Regi sensor after certain time.

DUPLEX
JAM 0

- After the leading edge of the paper passes the Regi sensor, the leading edge of the paper cannot
reach the feed sensor after certain time.

2.2.3.3(b) Driver
By gearing, the main motor drives the rollers such as feeding roller, developing roller, fuser roller, and exiting
roller. The BLDC motor is controlled for the such acceleration section and steady section.
The BLDC main motor is operated by the BLDC clock and the enable signal.

2.2.3.3(c) Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width
Modulation). The each output voltage is changeable due to the PWM duty. The transfer voltage admitted when
the paper passes the transfer roller is decided by environment recognition. The resistance value of the transfer
roller is changed due to the surrounding environment or the environment of the set, and the voltage value,
which changes due to the environments, is changed through AD converter. The voltage value for impressing to
the transfer roller is decided by the changed value. Each voltage value is controlled according to 3.3.4.2 Timing
Chart.

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Product spec and feature

2.2.3.3(d) Fusing
The temperature change of the heat roller°Øs surface is changed to the resistance value through the thermistor.
By converting the voltage value, which impressed to the resistance, to the digital value through the AD converter,
the temperature is decided. The AC power is controller by comparing the target temperature to the value from the
thermistor. If the value from the thermistor is out of controlling range while controlling the fusing, the error stated
in the below table occurs.
• Lamp Method
Error

Description

OPEN HEAT ERROR

- When warming up, it has been lower than 90

LOW HEAT ERROR

- Standby has been lower than the Standby Reference Temperature -20 over 10 seconds.
- Printing has been lower than the Printing Reference Temperature -20 over 10 seconds.
- When WarmUp End Process, it have been lower than the WarmUp Reference Temperature -10
over 10 seconds.

OVER HEAT ERROR

- It has been higher than 220 over 20 seconds
- It has been higher than 230 over 3 seconds
- It has been higher than the Standby Reference Temperature +10

over 20 seconds

over 180 seconds.

=>This can be changed in the future.

2.2.3.3(e) LSU
The LSU is consisted of the LD (Laser Diode) and the polygon motor control. When the printing signal occurs, it
turns on the LD and drives the polygon motor. When the detector detects the beam, Hsync occurs. When the
polygon motor speed becomes strady, Lready occurs. If two conditions are satisfied, the status are not satisfied,
the error shown in below occurs.
Error

Description

Polygon Motor Error

Whenthe polygon motor speed doesn t become steady

Hsync Error

The polygon motor speed is steady but the Hsync is not generated

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Product spec and feature

2.2.4 S/W Descriptions
2.2.4.1 Overview
The software of Plover system is constructed with
1) Host Software part that the application software operated in Window and Web Environment, and
2) Firmware parts that is a Embedded software controls printing job.

2.2.4.2 Architecture

Host Software is made up of
1. Graphic User Interface that offers the various editing functions to user in Host,
2. Driver that translates the received document to a Printing Command language which printer can understand and
transfers data to spooler,
3. Stand-alone Application that offers the various printing application, PSU(Printer Settings Utility), Printer Status Monitor,
Network Management in Window system,
4. Web-based-Application that offers the same functions as Stand-alone Application and RDC(Remote Diagnosis
Control) in Web environment.
Firmware is made up of
1. Application (Emulation) that is a interpreter translate data received from Host to a printing language (PCL, PS, GDI,
etc.) to be able to make the user to take same output as originally one what composed in Host.
2. Kernel that control and management the whole procedure include of Control flow and Printing Job before transfer to
Engine system.

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Product spec and feature

2.2.4.3 Data and Control Flow

The above Block Diagram is explained that:
Host Side is made up of
1. Driver that is Windows application software translate printed data to one of printer language and create spooler file,
2. Web-based Application that offer a various printer additional functions, management of printing job, printer administration, Status monitor to monitoring the printer status by real time in Web, independent environment on OS.
3. Stand-alone Application that is a similar Window software as same as above 2,
4. Port Monitor that manages the network communication between spooler and Network Interface Card, or various additional application and Network Interface Card,(this is, at first, make communication logical port, manage the data,
transfer them from spooler to network port, and offer the result of printing).

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Product spec and feature

Firmware Side is made up of
1. Network Interface Card is that relay the communication between Host and kernel using various network protocol,
2. Kernel is that manages the flow control of emulation procedure, receiving data from Host or Network card and printing
with engine & rendering job,
3. Emulation is that interprets the various output data from selected emulation,
4. Engine is that prints rendered bit-map data to paper with required size and type by Kernel.

And then, for Job Spooling function for Multi-User, Multi-Printing that is occurred in Network printing and various additional printing functions, this Kernel use max. 10 Queuing systems in a memory.
In Printing, the two procedures are
(1) Case of using USB Port
After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver translate the
all graphic data of it and send data to host spooler. And then the spooler sends the data stream to the printer via
USB port.
Kernel receives this data from Host, and then select emulation fit to data and start selected one. After emulation
job end, Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU).
Engine print the received data to required paper with the sequential developing process.
(2) Case of using Network Interface Card
After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver translate the
all graphic data of it and send data to host spooler.
If so, Port monitor managing network port receives data from spooler and sends a data stream to the Network
Interface Card.
Network interface card receives it and send to Kernel part,
Kernel receives this data from Host, and then select emulation fit to data and start selected one. After emulation
job end, Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU).
Engine print the received data to required paper with the sequential developing process.
The additional printing function are realized in
(1) Web environment
(2) Window environment.
On addition, Kernel informs a status of printing status and printer status to user made printing job with the Status
Monitor.

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Disassembly and Reassembly

3. Disassembly and Reassembly

3.1 General Precautions on Disassembly
When you disassemble and reassemble components, you must use extreme caution. The close proximity of cables
to moving parts makes proper routing a must.
If components are removed, any cables disturbed by the procedure must be restored as close as possible to their
original positions. Before removing any component from the machine, note the cable routing that will be affected.

Whenever servicing the machine, you
must perform as follows:

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.

1. Check to verify that documents are not stored in
memory.
2. Be sure to remove the toner cartridge before you
disassemble parts.
3. Unplug the power cord.
4. Use a flat and clean surface.
5. Replace only with authorized components.
6. Do not force plastic-material components.
7. Make sure all components are in their proper position.

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Disassembly and Reassembly

3.2 Used Screw List

6003-000196

DUPLEX UNIT

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

FRAME

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

FUSER

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

ENGINE

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

COVER TOP

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

CASSETTE

SCREW-TAPTITE;PWH,+,B,M3,L10,NI PLT,SWRCH18A

2
1

6003-000261

CASSETTE

SCREW-TAPTITE;BH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,-

6003-000264

FRAME

SCREW-TAPTITE;PWH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,-

CASSETTE

SCREW-TAPTITE;PWH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,-

6003-000269

DRIVE

SCREW-TAPTITE;BH,+,-,S,M3,L6,ZPC(WHT),SWRCH18A,-

6003-000282

DUPLEX UNIT

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,-

FRAME

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,-

FUSER

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,-

FRONT COVER

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,-

LSU

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,-

SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,6

6003-000301

FRAME

SCREW-TAPTITE;BH,+,-,S,M4,L6,ZPC(WHT),SWRCH18A,-

6003-001256

ENGINE

SCREW-TAPTITE;BH,+,B,M4,L10,NI PLT,SWRCH18A

6006-001078

FRAME

SCREW-TAPTITE;PH,+,WSP,B,M3,L10,ZPC(WHT),
SWRCH18A,-

6002-000440

Duplex 1, Frame 13

PWH,+,-,2,M3,L8,ZPC(BLK),SWRCH18A,-

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Disassembly and Reassembly

3.3 Cover Unit
3.3.1 CASSETTE & Front Cover
1. Remove the CASSETTE
2. Remove the FRONT COVER carefully, especially hooks.
3. Remove the TONER CARTRIGE.

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Disassembly and Reassembly

3.3.2 DUPLEX UNIT & COVER-TOP/COVER-REAR
1. Remove two SCREW in front view
2. Turning back of SET, remove DUPLEX UNIT like below figure.
3. After open the COVER-REAR, remove two SCREWs, then disassemble the Cover-Top up.
4. Remove COVER-REAR.

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Disassembly and Reassembly

3.3.3 Cover-Side-LEFT/RIGHT
1. Remove their first hook from frame-base.
2. After removing the hook of backside, remove Cover-Side-LEFT/RIGHT.

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Disassembly and Reassembly

3.4 Fuser Ass’y
1. Before fuser ass’y removal, Remove COVER-TOP/DUPLEX/COVER-REAR.
2. After remove guide-rear assy like below figure, remove four screws of fuser assy.
3. In upper view, remove the three harness connected to fuser.
4. Remove fuser carefully not to damage HARNESSes.

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Disassembly and Reassembly

3.5 LSU(Laser Scanning Unit)
1. Before LSU ass’y removal :
- Remove the COVER-TOP/COVER-RIGHT.
2. Remover four Screw (M4,L10) of LSU and one connector from Main B’D.

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Disassembly and Reassembly

3.6 Drive Ass’y
1. Before Drive ass'y removal :
- Remove the CASSETTE/Cover-FRONT/COVER-TOP/COVER-LEFT Assy.
2. Remove the seven Screws and remove Drive Ass'y carefully.
3. Remove the Connector of Drive Ass'y.

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Disassembly and Reassembly

3.7 Main PBA/SMPS/HVPS
1. Before Main PBA/SMPS/HVPS removal ::
- Remove CASSETTE/COVER-FRONT/COVER-TOP/COVER-RIGHT
2. HVPS : Remove 6 screws and 1 HARNESS
SMPS : Remove 4 screws and 3 HARNESSes
Main PBA : Remove 4 screws and all HARNESSes

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Disassembly and Reassembly

3.8 HOLDER-PAD Disassembly
1. Remove the CASSETTE from SET.
2. Disassemble HOLER-PAD after putting out three HOOKs

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Disassembly and Reassembly

3.9 Transfer Roller
1. Open the COVER-FRONT.
2. Push HOLDER-TRANSFER, which holds the transfer roller and remove the roller from set.
3. Be carefull not to touch the sponge of Transfer Roller.

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Alignment & Troubleshooting

4. Adjustment and Troubleshooting
4.1 Alignment and Adjustments
4.1.1 Sample Pattern
This product has the several sample patterns for maintenance. With the sample patterns, check the
existence of the abnormality. The patterns help to regularly maintain the product.

4.1.1.1 Printing a Demo Page
After setting up your printer, print a demo page to make sure that the printer is operating correctly.
Press and hold the Cancel button for about 2 seconds.
A demo page prints out.

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Alignment & Troubleshooting

4.1.1.2 Printing a configuration Page
Press and hold the Cancel button for about 4 seconds.
A configuration page prints out.(print out with the menu map sheet)

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Alignment & Troubleshooting

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Alignment & Troubleshooting

4.1.2 Control Panel
4.1.2.1 Control Panel

Error: Indicates the status of your printer.

Online: Indicates the status of your printer.

Cancel: Prints a demo page or configuration page.
Cancels the print job.
Makes the printer pick up the print media.

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Alignment & Troubleshooting

4.1.2.2 Network setup(ML-2851ND only)
This chapter gives you basic information for setting up your printer for network connections.
This chapter includes:
• Introduction
• Supported operating systems
• Using SetIP program
Introduction
Once you have connected your printer to a network with an RJ-45 Ethernet cable, you can share the printer with other
network users.
You need to set up the network protocols on the printer to use it as your network printer. Protocols can be set up by the
following programs:
• SyncThruTM Web Admin Service: A web-based printer management solution for network administrators. SyncThruTM
Web Admin Service provides you with an efficient way of managing network devices and lets you remotely monitor and
troubleshoot network printers from any site with corporate intranet access. You can download this program from
http://solution.samsungprinter.com.
• SyncThruTM Web Service: A web server embedded to your network print server, which allows you to configure the
network parameters necessary for the printer to connect to various network environments.
• SetIP: A utility program allowing you to select a network interface and manually configure the addresses for use with the
TCP/IP protocol.
This program is on the software CD that comes with your printer.
Supported operating systems
The following table shows the network environments supported by the printer:
Item
Network interface
Network operating system

Network protocols

Dynamic addressing server

Requirements
• 10/100 Base-TX
• Windows 2000/XP(32/64 bit)/2003/Vista
• Varios Linux OS including Red Hat 8 ~ 9, Fedora Core 1 ~ 4, Mandrake
9.2 ~ 10.1, SuSE 8.2 ~ 9.2
• Mac OS 8.6 ~ 9.2, 10.1 ~ 10.4
• TCP/IP
• EtherTalk
• HTTP 1.1
• SNMP
• DHCP, BOOTP

• TCP/IP: Transmission Control Protocol/Internet Protocol
• DHCP: Dynamic Host Configuration Protocol
• BOOTP: Bootstrap Protocol

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Alignment & Troubleshooting

Using SetIP program
This program is for the network IP setting using the MAC address which is the hardware serial number of the network
printer card or interface.
Especially, it is for the network administrator to set several network IPs at the same time.
Note
If you want to setup DHCP network protocol, go to the http://developer.apple.com/networking/bonjour/download/,
select the program Bonjour for Windows due to your computer operating system, and install the program. This
program will allow you to fix the network parameter automatically. Follow the instruction in the installation
window. This program does not support Linux.
1. Insert the driver CD provided along with your machine.
2. Start Windows Explorer and open the X drive. (X represents your CD-ROM drive.)
3. Double click Application > SetIP
4. Open the language folder you want to use.
5. Double click Setup.exe to install this program.
6. From the Windows Start menu, select Programs > Samsung Network Printer Utilities > SetIP.
7. Select the name of your printer and click "
Note

If you cannot find your printer name click "

" to refresh the list.

8. Enter the network card's MAC address, IP address, subnet mask, default gateway, and then click Apply.
Note
If you do not know the network card's MAC address, print the machine's network information report.
9. Click OK to confirm the settings.
10. Click Exit to close the SetIP program.

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Alignment & Troubleshooting

4.1.3 Consumables and Replacement Parts
To avoid print quality and paper feed problems resulting from worn parts and to maintain your printer in top working
condition the following items will need to be replaced at the specified number of pages or when the life span of each
item has expired.
COMPONENT

REPLACEMENT CYCLE

Pick-up Roller

50K Pages

Transfer Roller

50K Pages

Fuser

50K Pages

Toner Cartridge

2K Pages(Initial/Sales), 5K Pages(Sales)

4.1.4 LED Status Error Message
4.1.4.1 Status LED
Status
Error

Description
Red

• The cover is open. Close the cover.
• There is no paper in the tray.
Load paper in the tray.
• The printer has stopped printing due to a major error.
• The toner cartridge is not installed. Install the toner cartridge.
• Your system has some problems. If this problem occurs, contact your service
representative.
• The toner is totally exhausted.
Remove the old toner cartridge and install a new one.

Blinking

• A minor error is occurring and the printer is waiting for the error to be cleared.
When the problem is cleared, the printer resumes printing.
• The toner cartridge is low. Order a new toner cartridge. You can temporarily
improve print quality by redistributing the toner.

Online

Orange

• A paper jam has occurred. To solve the problem..

Green

• The printer is in power save mode.
• The printer is on-line and can receive data from the computer.

Blinking

• Blinks slowly indicates that the printer is receiving data from the computer.
• Blinks quickly indicates that the printer is printing data.

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Alignment & Troubleshooting

4.1.5 Abnormal Image Printing and Defective Roller
If abnormal image prints periodically, check the parts shown below.

7-2

7-1

Roller

Abnormal image period

Kind of abnormal image

OPC Drum

75.5mm

White spot, Block Spots

Charge Roller

26.7mm

Block Spot and Periodic Band

Supply Roller

47.1mm

Periodic Band by little difference of density

Developing Roller

35.2mm

White Spot, Horizontal black band

Transfer Roller

47mm

Ghost, Damaged Image by abnormal transfer

Heat Roller

77.6mm

Black Spots or Vertical Black Band

7-1

Pressure Roller _1st

62.8mm

Blackground

7-2

Pressure Roller _2st

37.7mm

Blackground

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Alignment & Troubleshooting

4.1.6 How to use DCU
4.1.6.1 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(4 pin) to the CN17 of the Main control board.

ML SERIES DIAGNOSTIC CONTROL UNIT
04 DEV 300

DEV 350

05 LSU READY

LSU MT & LD

LSU MOTOR

07 PAPER EMPTY

PAPER WIDTH

NEW CRU

EXIT SENSOR

FEED SENSOR

SELF
TEST

09 COVER OPEN

STATUS

10 COER HEATING PRINTING TEMP READY HEAT

DIAGNOSTIC

OFF

ON
DIAGNOSTIC CODE
00
01
02
03
04
05
06
07
08
09
10
11

MAIN MOTOR OPERATING SYSTEM
MAIN HIGH-VOLTAGE ON
TRNSFER HIGH-VOLTAGE (-)ON
THV(+) REFERANCE VOLTAGE
DEV/SUPPLY HIGH-VOLTAGE ON/PTL ON
LSU OPERATING SYSTEM
PICKUP CLUTCH ON
PEEMPTY/PWITH/NEW CRU TEST
FEED & EXIT SENSOR TEST
COVER OPEN SENSOR TEST
FUSER TEST
HOT BURN TEST

CLEAN MODE PRINT

THV(+)TRIGGER, ALL HV & FAN ON

THV(+) REFERENCE ON

STATUS CODE
61

WARM UP

00
01
02
03
04

READY
READY
READY
READY
READY

20
30
40
50

PRINT START
FEED SENSOR ON
FEED SENSOR OFF
PAPER OUT

SLEEP MODE

(REGAL)
(LETTER)
(A4)
(EXECUTIVE)
(B5)

ERROR STATUS CODE
60
62
68
64
70
71
72
73
95

DIAGNOSTIC
MODE

DOWN
UP

OPEN FUSER ERROR
LOW TEMPERATURE ERROR
OVER HEATING ERROR
COVER OPEN ERROR
NO PAPERR
PAPER JAM 0
PAPER JAM 1
PAPER JAM 2
LSU NOT READY

SHIFT

STOP
ENTER

TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL
AND TURN THE PRINTER POWER ON.

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Alignment & Troubleshooting

4.1.6.2 Code
Connect DCU to the printer and turn the power on. It show 7 Segment FND on the panel and each code tells the
function of the printer.

1) Normal Code
While printing or warming up, it indicate the position of the paper
Code

State

61
00~05

Warm up
Ready(kind of paper)

20, 21, 22

Print Start

30
40
50
69

Feed Sensor On
Feed Sensor off
Paper Out
Sleep Mode

Description
The printer is on, the cover is open or close.
The printer is ready, the paper is detected when the first paper is printed.
00: Legal ,01: Letter ,02: A4 ,03: EXEC ,04: B5 ,05: Folio, 06: A5/A6
The engine controller received the print order from the video controller.
20: 1st, 21: MP, 22: SCF
The paper is passing out of the Feed Sensor.
The paper has passed out of the Feed Sensor.
The paper has passed out of Exit Sensor.
The fuser power turned off to minimize the power consumption.

2) Error Code
When detecting the malfunction, the printing is stopped to indicate error code.
Code

State

60, 62, 68

Fuser Error

64
65
70
71
72

Cover Open
CRU Error
No Paper
Paper Jam 0
Paper Jam 1

Paper Jam 2

95
96

LSU Not Ready
LSU Not Ready

Service Manual

Description
The error in the fuser occurred. There is a short circuit in the thermistor
and the thermostat while printing, Low Temperature Error occurs.
• 60: Open Fuser Error
• 62: Low Heat Error
• 68: Over Heat Error
The Printer Cover is open.
The Toner Cartridge not installed,
No paper in the paper cassette.
The front part of paper is jammed between pickup unit and Feed sensor.
The front part of paper is jammed between the Discharge sensor and Feed
sensor.
The front part of paper is jammed just after passing through the discharge
sensor.
LSU Scanner Motor not ready.
Hsync signal not output.

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Alignment & Troubleshooting

4.1.6.3 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.
Code

Description

Main Motor Operating System
Only the main motor is in operation.

Main High Voltage On(THV-)
-1400 voltage output by MHV terminal.
Caution : High voltage probe should be used.

Transfer High Voltage(-)On(THV-)
-1000 voltage output by MHV terminal.
Caution : High voltage probe should be used.

Transfer High Voltage (+)Reference on (THV +)
+1300 voltage output by MHV terminal.
Caution : High voltage probe should be used.

DEV/supply High Voltage : DEV/Supply High Voltage Test.
The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply
high voltage output by each HV terminal. Press the [Up] button to switch the voltage. The
middle and right one of the three LEDs are on and -350 voltage output by DEV HV
terminal.
Caution : High voltage probe should be used.

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

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

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Alignment & Troubleshooting

Code

Description

Paper Empty Sensor Test :
If activate the Actuator of the PEMPTY Sensor, the left and right of the three LEDs are
on.
Paper Empty Sensor ON/OFF
1st LED ON/OFF

Feed & Exit Sensor Test
Test the Feed sensor and Discharge sensor in the same way as '07'.
Feed Sensor ON/OFF
2nd LED ON/OFF
Exit Sensor ON/OFF
3rd LED ON/OFF

Cover Open Sensor Test
Test the Cover Open Sensor in th same way as code '07’
Cover Open Sensor ON/OFF1st LED ON/OFF

Fuser Test
If the [Enter] button pressed, the right LED is on and temperature of the fuser is up to
READY Mode. If the [Up] button pressed, the middle LED is on and temperature of the
fuser is up to Printing Mode.
If you press the button once more, the left LED is on and temperature of the fuser is up to
overheat Mode.

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

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

THV(+) TRIGGER. ALL HV :
All high voltage output by each HV terminal and LSU and the fan is in operation. In this
mode, electronic resistance of transfer roller and high voltage is detected.

Fan Test :
Indicates the function of the Fan, same method of the code ‘07’.

Manual Pickup Test :
Indicates the function of th Manual Pickup, same method of the code ‘07’.

Manual Sensor Test :
Indicates the function of the Manual Sensor, same method of the code ‘07’.

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Alignment & Troubleshooting

No.

Function

Enter

Motor

Motor Run

Motor Stop

MHV

Mhv On

Mhv Off

- 1300V

THV(-)

Thv Negative On

Thv Negative Off

-1000V

THV(+)

Thv On

Thv Off

+1300V

DEV

Dev On

Dev Off

-350V

LSU

LSU Run

LSU Stop

020mV

PickUp

Pickup On

PEmpty

Sensor

Cover

Fuser

Fuser On

Hot Burn

Hot Burn On

Clean Print

Clean Printing

Up/Down

Stop

Supply

DEV

0 : -550V

0 : -350V

Off

Ready

Remark

Pickup Off

Paper Empty

Exit

Feed

Cover Open
Fuser Off

Thv
low

Reference

adequate

high

PTL

PTL On

PTL Off

FAN

Fan On

Fan Off

Manual Pickup On

Manual Pickup Off

Manual

PTL No

Pic kUp
Manual
17

Sensor

Manual Sensor

4.1.6.4 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 warmingup 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.

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Alignment & Troubleshooting

4.1.6.5 Paper Path

LSU

DEVE

FUSER
DUPLEX

CASSETTE

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Alignment & Troubleshooting

4.1.7 Paper Jam
4.1.7.1 In the paper feed area

2. Remove the jammed paper by gently pulling it
straight out. Make sure that all of the paper is
properly aligned in the tray 1.

In the tray 1
1. Pull the tray 1 open.

If the paper does not move when you pull, or if you
do not see the paper in this area, check the fuser
area around the toner cartridge.
3. Insert the tray 1 into the printer until it snaps into
place. Printing automatically resumes.

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Alignment & Troubleshooting

In the optional tray 2

In the manual tray

1. Pull the optional tray 2 open.

1. Remove the jammed paper from the printer.

2. Remove the jammed paper from the printer.

2. Open and close the front cover.
If the paper does not move when you pull, or if you
do not see the paper in this area, stop and go to
step 3.

3. Load a paper into the manual feeder, then the
printer resumes.

3. Pull the tray 1 half.
4. Pull the paper straight up and out.

5. Insert the trays back into the printer. Printing
automatically resumes.

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Alignment & Troubleshooting

4.1.7.2 Around the toner cartridge
1. Open the front cover and pull the toner cartridge
out.

2. Remove the jammed paper by gently pulling it
straight out.

3. Replace the toner cartridge and close the front
cover. Printing automatically resumes.

4.1.7.3 In the paper exit area
4. Pull the guide rear on each side down and remove
the paper.
Return the guide rear to its original position.

1. Open and close the front cover. The jammed paper
is automatically ejected from the printer.
2. Gently pull the paper out of the output tray.

If you do not see the jammed paper or if there is
any resistance when you pull, stop and go to the
next step.

guide rear

3. Open the rear cover.
5. Close the rear cover. Printing automatically
resumes.

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Alignment & Troubleshooting

4.1.7.4 In the duplex unit area
If the duplex unit is not inserted correctly, paper jam may occur. Make sure that the duplex unit is inserted correctly.
Duplex jam 0
1. Pull the duplex unit out of the printer.

Duplex jam 1
1. Open the rear cover.
2. Pull the guide rear on each side down and remove
the paper.
Return the guide rear to its original position.

duplex unit

2. Remove the jammed paper from the duplex unit.
1

guide rear

3. Close the rear cover. Printing automatically
resumes.

If the paper does not come out with the duplex unit,
remove the paper from the bottom of the printer.

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Alignment & Troubleshooting

4.1.7.5 TiPs for avoiding paper jams
By selecting the correct media types, most paper jams can be avoided.
• Follow the procedures. Ensure that the adjustable guides are positioned correctly.
• Do not overload the tray. Ensure that the paper level is below the paper capacity mark on the inside wall of the
tray.
• Do not remove paper from the tray while your printer is printing.
• Flex, fan, and straighten paper before loading.
• Do not use creased, damp, or highly curled paper.
• Do not mix paper types in a tray.
• Use only recommended print media.
• Ensure that the recommended print side of print media is facing down in the tray, or facing up in the multi-purpose
tray.
• If paper jams occur frequently when you print on A5-sized paper.
Load the paper into the tray with the long edge facing the front of the tray.

In the printer properties window, set the page orientation to be rotated 90 degrees.

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Alignment & Troubleshooting

4.1.8 Download & Reset F/W

Firmware download method
1.
Normal
Download
method

LED Panel

Boot
Download
method

LED Panel

2.
3.
4.

In Do s Prompt, type "Usblist2 [ Rom file name] " and Press
Enter
Status LED Slow blink
Status LED & Ton er Save LED are both blink
When download complet e, set will be automatically power
On/O ff and it' ll Warming Up

1.
2.

While Pressing Stop k ey, Power O n t he Print er
In Dos Prompt, type "Usblist2 [Rom file name]" and Press
Enter

3.
4.
5.

Status LED Slow bli nk
Status LED & Ton er Save LED are both blink
When download complete, set will be automatically power
On/O ff and it' ll Warming Up

In Dos Prompt, type "Usblist2 [Rom file name]" and Press
Enter
Status LED Slow blink Fast bli nk then print out
configuration page
Check th e OS version and total pa ge value is "0"

Please set power On/ Off

Reset method

LED Panel

Service Manual

4-20

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Alignment & Troubleshooting

4.2 Troubleshooting
4.2.1 Procedure of Checking the Symptoms
Before attempting to repair the printer first obtain a detailed description of the problem from the customer.

Power On

Green LED on?

- No Power
- Power Module error
- Main PBA error
- Panel PBA error

Ready or
Power save

Error Lamp ON?

Refer to
4.1.4 LED Status
Error Message

Test Print

printing
Quality is
Nomal?

Refer to "Solution
of Image Problem"

END

Service Manual

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Alignment & Troubleshooting

4.2.2 The cause and solution of Bad image

1) Vertical Black Line and Band
Description: 1. Straight thin black vertical line occurs in the printing.
2. Dark black vertical band occur in the printing.

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

2. Scratched surface of
the charge roller in the toner cartridge.

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

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4-22

If causes 1 and 2 occur in the
toner cartridge, replace the toner
cartridge and try to print out.

Replace the transfer roller if
occurred as No. 3.

Samsung Electronics

Alignment & Troubleshooting

2) Vertical White Line
Description: White vertical voids in the image.

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

2. Foreign matter or
toner particles between the toner
cartridge roller and blade. (In case the life of the
toner cartridge has been expired, white
lines or light image occur in
front of the image.)

Replace the toner cartridge.

3. It may occur when Burr and
foreign substances are on the window
of the toner cartridge frame.

No 3. : Remove the foreign matter
and burr of the exposure window.
(toner cartridge)

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

No. 4. : Open the front cover and
check ribs that corresponds to the
position of the voids. Remove if
found.

5. It may occur when foreign
substances are on the OPC Drum.

6. Partly depression or
deformation on the surface of the
transfer roller

Service Manual

Foreign matter stuck onto the
window : Clean the LSU window
with recommended cleaner(IPA)
Clean the window with a clean
cotton swab.

4-23

If the problems are not solved,
replace the toner cartridge.

Replace the transfer roller if
occured as NO.6

Samsung Electronics

Alignment & Troubleshooting

3) Horizontal Black Band
Description: Dark or blurry horizontal stripes occur in the printing periodically.
(They may not occur periodically.)

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Service Manual

1. Bad contacts of the voltage
terminals to toner cartridge.

Clean each voltage terminal of the
Charge, Supply, Develop and
Transfer roller. (remove the toner
particles and paper particles)

2. The rollers of toner
cartridge may be stained.
Charge roller = 26.7mm
Supply roller = 47.1mm
Develop roller = 35.2mm
Transfer roller = 47mm

1. Clean the right Gear that has
relatively small gap of the teeth
in the OPC.
2. If the malfunction persists,
replace the toner cartridge.

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Samsung Electronics

Alignment & Troubleshooting

4) Black/White Spot
Description: 1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing

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1. If dark or blurry
black spots occur periodically,
the rollers in the Toner
oner cartridge may
be
be contaminated
contaminated with
with foreign
foreign matter
matte or
or
paper particles.
( Charge roller : 26.7
37.7 mm interval
OPC drum : 75.5 mm interval)

2. If faded areas or
voids occur in a black image
at intervals of 75.5 mm, or black spots
occur elsewhere, the OPC drum
surface is damaged.

3. If a black image is
partially broken, the transfer
voltage is abnormal or the transfer
roller's life has expired.

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4-25

Run OPC cleaning Mode Print
and run the Self-test 2 or 3 times.

In case of 75.5 mm interval
unremovable in 1, cleanly remove
foreign substances stuck on the
OPC location equivalent to black
spots and white spots with a dry
duster.

1. The transfer roller guarantees
50,000 sheets printing. If the
roller's life is expired, replace it.
2. In case of 75.5 mm interval
unremovable in 1, take measures
as to replace the toner cartridge
and try to print out.
3. Clean the inside of the set
against the paper particles and
foreign matter in order not to
cause the trouble.

Samsung Electronics

Alignment & Troubleshooting

5) Light Image
Description: The printed image is light, with no ghost.

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Check if the Toner Save mode is off.
Check if the density is light.

1. Develop roller is
stained when the toner of toner
cartridge is almost consumed.

No 1 : Replace the toner cartridge
and try to print out.

No 2 : Wait 30 minutes after printer
is powered on before you
start printing.

2. Ambient temperature
is below than 10°C.

3. Bad contact
caused by the toner stains
between the high voltage terminal in
the HVPS and the one
in the set.

4. Abnormal output
from the HVPS.
(Run self-test and check 1~4)

Service Manual

No3 : Clean up the contaminated
area by the toner.

Replace the HVPS if the
problems are not solved by the
above four instructions.

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Samsung Electronics

Alignment & Troubleshooting

6) Dark Image or a Black Page
Description: The printed image is dark.

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1. No charge voltage in the engine board.

Check the state of the connector
which connects the engine board
and HVPS.

2. Charge voltage is not turned
on due to the bad contacts between
power supply in the side of the Toner
cartridge and charge terminal
of HVPS.

1. Clean the high voltage charge
terminal.
2. Replace the HVPS if not solved
by the above direction 1 and 2.

3. VD0 signal of the Main PBA is Low state.

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4-27

Replace the LSU Unit or Main PBA.

Samsung Electronics

Alignment & Troubleshooting

7) Uneven Density
Description: Print Density is uneven between left and right.

1. The pressure force
on the left and right springs of the
transfer roller is not even, the springs are
damaged, the transfer roller is improperly
installed, or the transfer roller
bushing or holder is
damaged.

Occur in the toner cartridge gently
shake the toner cartridge.

2. The life of the Toner cartridge
has expired.

3. The toner level is not even on
the toner cartridge roller due to the
bad blade.

Service Manual

Replace both the left and right
Spring Holder.

Replace the toner cartridge and
try to print out.

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Samsung Electronics

Alignment & Troubleshooting

8) Background
Description: Light dark background appears in whole area of the printing.

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1. Does character exist less than
2% per a page, and hasn’t it been
used long time?

2. Is a recycled toner cartridge be used?

The A/S is not guaranteed if using
a recyled the toner cartridger.

3. Has the life span of the toner
cartridge ended?

Replace the toner cartridge when
the life span of it has been ended.

4. Is the movement(Up and Down)
of the transfer roller smooth?

Clean the bushing part of the
transfer roller.

1. If the problem is still not solved,
replace the toner cartridge.
2. Gently shake the toner
cartridge.

5. Is the HVPS normal?

Service Manual

The toner cartridge is basically
designed to print 5K sheets with
5% image. If it prints more than
6K sheets with 2% coverage, a
background can occur.

4-29

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Alignment & Troubleshooting

9) Ghost (1)
Description: Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.

75.5mm

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1. Bad contacts
caused by contamination
from toner particles between high voltage
terminal in the main body and the
electrode of the Toner
cartridge.

Clean the terminals when
contaminated by toner particles.

2. Bad contacts caused
by contamination from toner particles
between high voltage terminal in the main
body and the one in the
HVPS board.

Occur in the toner cartridge,
replace the toner cartridge and
try to print out.

3. The life of toner cartridge is expired.

Replace the engine board if not
solved by the above directions 1-2.

4. Transfer roller lifetime(50K sheets)
has expired.

If not solved by the direction 3,
check the transfer roller lifetime
and replace it.

Continue..

Service Manual

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Alignment & Troubleshooting

Continue..

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

Wait about 1 hour after power on
before using printer.

6. Damaged cleaning blade in the
toner cartridge.

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4-31

Occur in the toner cartridge,
replace the toner cartridge and
try to print out.

Samsung Electronics

Alignment & Troubleshooting

10) Ghost (2)
Description: Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.
(When printing on card stock or transparencies using manual feeder)

75.5mm

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When printing on card stock
thicker than normal paper or
transparencies such as OHP, higher
transfer voltage is
required.

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4-32

Select 'Thick Mode' on paper type
menu from the software application
and after using returning to the
original mode is recommended.

Samsung Electronics

Alignment & Troubleshooting

11) Ghost (3) : Fuser
Description: Ghost occurs at 62.8 mm or 77.6mm intervals.

62.8 or 77.6mm

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The temperature of the fuser is
maintained high.

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4-33

Disassemble the fuser and remove
the contaminated toner particles on
the roller and clean the foreign
matter between Thermistor and
Heat roller.
(Caution: can be deformed)

Samsung Electronics

Alignment & Troubleshooting

12) Stains on the Face of Page
Description: The background on the face of the printed page is stained.

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Service Manual

1. Toner leakage due to improperly
sealed toner cartridge.

Replace the toner cartridge.

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

If the transfer roller is
contaminated, run PC Cleaning
Mode Print 2 or 3 times.
And perform Self-Test 2 or 3 times
to remove contamination.

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Samsung Electronics

Alignment & Troubleshooting

13) Stains on Back of Page
Description: The back of the page is stained at 47 mm or 62.8mm intervals.

47 or 62.8mm

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Perform the OPC Cleaning Mode
Print 2 or 3 times. Run Self-Test to
remove the contamination of the
transfer roller.

1. 47mm : Transfer roller is
contaminated.

1. Replace the transfer roller if
contaminated severely.
2. Disassemble the fuser and clean
the H/R(Heat Roller) and P/R
(Pressure roller). And check the
area between H/R and Thermistor.
If contaminated, clean the area
not to be deformed.

2. 62.8mm : Pressure roller is
contaminated.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

14) Blank Page Print out (1)
Description: Blank page is printed.

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Bad ground contacts in OPC and/or
toner cartridge.

Service Manual

4-36

1. Check if the Ground-OPC is
defective(set inside right side).
2. Remove contamination of the
terminals of the toner cartridge
and the unit.

Samsung Electronics

Alignment & Troubleshooting

15) Blank Page Print out (2)
Description: 1. Blank page is printed.
2. One or several blank pages are printed.
3. When the printer turns on, several blank pages print.

1. Bad ground contacts in OPC and/or
toner cartridge.

1. Perform the engine self test
using DCU to check if the
Solenoid is normal.
2. If not solved by the above
directions 1-2, Replace the
engine board.
3. Turn the power off, delete the
data of PC and try printing again.

2. Abnormal solenoid.

Service Manual

Remove contamination of the
terminals of the toner cartridge.

4-37

Samsung Electronics

Alignment & Troubleshooting

4.2.3 The cause and solution of the bad discharge

1) Wrong Print Position
Description: Printing begins at wrong position on the paper.

Wrong sense time caused by defective
feed sensor actuator.

Service Manual

Replace the defective actuator

4-38

Samsung Electronics

Alignment & Troubleshooting

2) JAM 0
Description: 1. Paper is not exited from the cassette.
2. Jam-0 occurs when the paper feeds into the printer

1. Check the Solenoid by using
DCU.

Replace the solenoid.

2. Check if the pad is loose due to
bad sealing of the side-pad.

Replace the side-pad Assembly
L or R, if necessary.

3. Check the surface of the roller-pickup
for foreign matter.

Clean with soft cloth dampened
with IPA(Isopropyl Alcohol) or
water.

4. If continuous clusters
occur, check whether the assembly
slot between shaft-pickup and
housing-pickup opens or
is broken away.

Replace the Main PBA and/or
Sensor.

5. If the paper feeds into
the printer and Jam 0 occurs, perform
DCU to check feed-sensor
of the engine board.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

3) JAM 1
Description: 1. 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.

1. If the recording paper is jammed in
front of or inside the fuser.

Replace the SMPS or Exit-Sensor.

2. If the recording paper is
stuck in the discharge roller and the
fuser just after passing through the
Actuator-Feed, Feed Actuator
may be defective.

1. Replace the Main PBA.
2. Reassemble the Actuator-Feed
and Spring-Actuator if the
movement is bad.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

4) JAM 2
Description: 1. 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.

1. If the paper is
completely fed out of the printer,
but Jam 2 occurs : Exit sensor is defective.
• After the paper is completely discharged, actuator
Exit should return to the original position to shut the
photo-sensor. Sometimes it takes longer
hour than it should and does
not return.

Check if the exit sensor actuator is
defective.
• Check if the actuator exit is
deformed (Check if the lever part
is deformed in shape).
• Check whether burrs occur in the
assembly part of the actuator exit
or not and if the actuator is
smoothly operated.
• Check if foreign matter and wire
get caught in the actuator exit's
operation.

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
contaminated with
the toner.

3. Paper is accordion in the fuser.

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4-41

If the paper is stuck in the fuser :
disassemble the fuser and remove
the jammed paper, and clean the
surface of the pressure roller with
dry gauze.

Remove the jammed paper after
disassembling the fuser : Clean
the surface of the pressure roller
with dry gauze.
• Remove the toner particles
stained on the rib.
• Check the assemblage and
performance of the exit.

Samsung Electronics

Alignment & Troubleshooting

5) JAM Duplex
Description: Recording paper is Jamned in front or inside a duplex module.

It is a case that a paper cannot
reach to a registration sensor.

Service Manual

Replace a duplex roller.

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Samsung Electronics

Alignment & Troubleshooting

6) Multi-Feeding
Description: Multiple sheets of paper are fed at once.

Check the Guide side L/R or Guide
Rear in the Cassette, if the
position is correct.

Replace the solenoid if necessary.

2. Solenoid malfunction
(the solenoid does not work properly):
Perform DCU.

Service Manual

Replace the Main PBA.

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

Clean the pad friction with soft
cloth dampened with IPA
(Isopropyl Alcohol).

4. The face of paper is blended.

Use the smooth paper.

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Samsung Electronics

Alignment & Troubleshooting

7) Paper rolled in the fuser
Description: If contaminated at intervals of 77.6mm on the back of a paper.

After disassembling the fuser,
clean contamination between the
heat roller and the thermostor and
remove the contamination of the
pressure roller.

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

1. If there is heavy background,
repair it by the background
troubleshooting method.
2. Clean the surface of the heat
roller with IPA or water
3. Check the warp or separation
of the print claw and the holder
plate claw, and then manage it.

2. Check the claw of the fuser
whether it is deformed.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

8) Paper rolled on the OPC Drum
Description: Paper is rolled up in the OPC.

Recommend to use normal paper.

1. Paper is too much thin.

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 tissue.

2. The face of paper is curled.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

4.2.4 The cause and solution of the malfunction

1) Fuser Error
Description: All LEDs blinking.

Replace the fuser if a thermostat
is open.

1. Check whether a thermostat,
AC wire, and heat lamp are
open or not.

2. Check whether a
thermistor is open or not.

Replace the fuser if a thermistor
sensor is located deep inside of
a sponge.

3. Heat lamp ON/OFF test

Check whether the overheat
mode circuit operates normally
or not.

4. It could not operate
due to a gear of a fuser is melted.

Service Manual

Replace the fuser.

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Alignment & Troubleshooting

2) LSU Error
Description: "PMOTOR ERROR/HSYNC ERROR'

1. Check whether the LSU
connector is disconnected or not.

Replace a LSU

Replace a main board if the same
error occurs again after replacing
a LSU.

2. Check whether the LSU
motor is rotating or not.

3. Check the HSYNC signal.

Service Manual

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Alignment & Troubleshooting

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.

1. Replace the Fuser.
2. Replace the Main PBA.
3. Replace the SMPS.

1. Check the Heat Lamp.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

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 sensor.

Replace the defective actuator.

2. The function of the
engine board is defective

Replace the Sensor PBA.

3. Check the Connector.

Service Manual

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Samsung Electronics

Alignment & Troubleshooting

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 sensor.

Replace the defective actuator.

2. The function of the
engine board is defective

Service Manual

Replace the engine board.

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Samsung Electronics

Alignment & Troubleshooting

6) Cover Open
Description: The ERROR lamp is on even when the print cover is closed.

1. The hook lever in the
front cover or Guide rear
may be defective.

Replace the hook lever,
if defective.

2. Check the connector
and circuit of the cover switch department
in the Main Control board.

Service Manual

4-51

1. Check the insertion of the
Cover Open S/W Connect.
2. Replace the Main Control
board or Cover Open S/W.

Samsung Electronics

Alignment & Troubleshooting

7) No error LED when the cover is open
Description: The Error LED does not come on even when the printer cover is open

1. Check the connector and
circuit of the cover switch department
in the Main Control board.
Perform DCU test

Service Manual

4-52

1. Check the insertion of the
Cover Open S/W Connect.
2. Replace the Main Control
board or Cover Open S/W.

Samsung Electronics

Alignment & Troubleshooting

8) Defective motor operation
Description: Main motor is not driving when printing, and paper does not feed into the printer, resulting 'Jam 0'.

After disassembling the fuser,
clean contamination between the
heat roller and the thermostor and
remove the contamination of the
pressure roller.

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

2. Check the claw of the fuser
whether it is deformed.

Service Manual

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Alignment & Troubleshooting

9) No Power
Description: When system power is turned on, all lamps on the operator panel do not come on.

Replace the power supply cord
or SMPS.

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

2. Check the inferiority
of LED-Panel or LCD window on the
front-cover if the OP panel does not
appear after normal
warming-up.

Service Manual

1. Replace the control board.
2. Replace the OP panel.

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Alignment & Troubleshooting

10) Vertical Line Getting Curved
Description: When printing, vertical line gets curved.

1. If the supply of +24v is
unstable in the Main Control board
linking with LSU, check drive by
DCU test:
LSU Check.

Replace LSU.

1. Replace theToner Joint PBA.
2. Replace the MainPBA.

2. Chect the Deve PBA
in the Toner Cartridge.

Service Manual

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Alignment & Troubleshooting

4.2.5 Toner Cartridge Service
It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the Samsung
Electronic or caused by non-licensed refill production.

4.2.5.1 Precautions on Safe-keeping of Toner Cartridge
Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.

4.2.5.2 Service for the Life of Toner Cartridge
If the printed image is light due to the life of the toner, you can temporarily improve the print quality by redistributing the
toner(Shake the toner cartridge), however, you should replace the toner cartridge to solve the problem thoroughly.

4.2.5.3 Distinguish function for choice cartridge
• Distinguish function for choice cartridge
An EEP ROM is mounted to a cartridge for distinguishing a choice toner cartridge. Items written in below
are detected by checking up memory information.
If the data of the EEP ROM is broken, it cannot be detected.
1) Detecting existence of a toner cartridge: It detects whether a toner cartridge is mounted or not.
2) Detecting a serial number of a toner cartridge.
3) Detecting a toner cartridge supplying company: If it is not Samsung’s, it is not operated.
4) Detecting an OPC rotating counter: It detects the life span of an OPC drum.

• Distinguish a refilled cartridge. (with eyes)
1) Check whether One-way screw is damaged or not
2) Check the cartridge on configuration sheet(Print out the self-test configuration)
: Manufacture date and serial number of toner cartridge are different(permissible range : +/- 1).

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Alignment & Troubleshooting

4.2.5.4 Error related in a toner sensor
It explains a message related in toner sensor in a LED.

4.2.5.4(a) Invalid Toner
- Contents: The red LED turns on when a supplier is different between a toner cartridge and a set.
- Solution: Attach a suitable toner cartridge (the same supplier's) to a set. (A unique key has been applied.)

4.2.5.4(b) Low Toner
- Contents: When a toner in the toner cartridge almost ended, the red LED is blinking.
- Solution: It means that a toner in the toner cartridge has been almost ended. Repare the new toner cartridge.

4.2.5.4(c) Replace Cartridge
- Contents: Turning the red LED on means the life span of a toner cartridge (except a toner part) has been ended.
- Solution: If an Toner Cartridge Life cycle Probreum, in a worst case, a toner overflows and it may cause a system fail.
Therefore, recommend a user to replace a toner cartridge.

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Alignment & Troubleshooting

4.2.6 The cause and solutions of bad environment of the software

1) The printer is not working (1)
Description: While Power turned on, the printer is not working in the printing mode.

Check the power of the printer and perform
the Self-Test. If the test printing works, that
means no problems in the printer itself.
If the test printing does not work, that
means bad functioning of the printer
(not because of software).

1. Run Self-Test Mode:
Turn the power on while pressing
the test printing button for 2 or 3 seconds
before printing works.

Replace the printer cable. If the problems
not solved even after the cable replaced,
check the amount of the remaining tone.
(refer to Toner Cartridge Service 4-5)

2. Check if the PC and the
printer is properly connected and
the toner cartridge installed.

Check if the connection between PC and printer
port is proper. If you use windows, check if the
printer driver in the controller is set up. If the printer
driver is properly set up, check in which program
the printing is not working. The best way to find out
is to open the memo pad to check the function of
printing. If it is not working in a certain program,
adjust the setup the program requires. Sometimes,
the printout is normal within the Windows basic
programs, but it's not working in a particular
program. In such case, install the new driver again.
If not working in the Windows basic program,
Check the setup of the port of CMOS is on ECP.
And check the address of IRQ 7 and 378

3. Printing is nor working in the Windows.

4. Check if the printer cable is
directly connected to peripheral devices

Service Manual

If the scanner needs to be connected to the
printer, first the remove the scanner from
the PC to see if the printer is properly
working alone.

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Alignment & Troubleshooting

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.

Not working with the message 'insufficient
printer memory' means hard disk space
problem rather than the RAM problem.
In this case, provide more space for the
hard disk. Secure more space using the
disk utilities program.

1. Secure more space of the hard disk.

2. Printing error occurs even
if there is enough space in the hard disk.

The connection of the cable and printer
port is not proper. Check if the connection
is properly done and if the parallel port in
CMOS is rightly set up.

3. Check the parallel-port-related
items in the CMOS Setup.

As a printer port, Select ECP or SPP
among SPP(Normal), ECP, and EPP
modes(increase printing speed) SPP
normal mode support 8-bit data transfer,
while ECP Mode transfer the 12-bit data.

If the regular font is not printing, the cable
or the printer driver may be defective.
Turn the PC and printer off, and reboot the
system to print again. If not solved,
double-click the printer in my computer If
the regular fonts are not printed this time
again. the cable must be defective so
replace the cable with new one.

4. Reboot the system to print.

Service Manual

4-59

Samsung Electronics

Alignment & Troubleshooting

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 defective
or wrong setup in the CMOS Setup.

Select SPP(Normal) or ECP LPT Port the
among ECP, EPP or SPP in the CMOS
Setup.

1. Set up the parallel
port in the CMOS SETUP.

Check the printer in My Computer.
(to see if the printer driver is compatible to
the present driver or delete the old driver,
if defective and reinstall the new driver)

2. Printer Driver Error.

3. Error message
from insufficient memory.
(The printing job sometimes stops or due
to insufficient virtual memory, but it actually
comes from the insufficient
space of the hard
disk.)

Service Manual

Delete the unnecessary files to secure
enough space of the hard disk and start
printing job again.

4-60

Samsung Electronics

Alignment & Troubleshooting

4) SPOOL Error
Description: To spool which stands for "simultaneous peripheral operations online" a computer document or
task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so that
it can be printed or otherwise processed at a more convenient time (for example, when a printer is
finished printing its current document).

1. Insufficient space of the
hard disk in the directory assigned
for the basic spool.

Delete the unnecessary files to provide
more space to start printing job.

If there are some files with the extension
name of ****.jnl, Delete them and Reboot
the Windows to restart printing job.

2. If the previous printing
error not solved.

Shut down all other programs except the
current one, if possible.

3. When expected to collide
with other program.

4. When an application
program or the printer
driver is damaged.

Delete the printer driver completely and
reinstall it.

After rebooting the computer, check for
viruses, restore the damaged files and
reinstall the program to do the printing job.

5. When some files related to
OS are damaged or virus infected.

6. Memory is less than
suggested one.

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 put out 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.

Service Manual

4-61

Samsung Electronics

ExplodedView and Parts list

5. Exploded Views and Parts List

Contents
5.1 Main

5-2

5.7 Main Drive

5-17

5.2 Top Cover

5-4

5.8 Rear Guide

5-19

5.3 Cover Ass'y

5-6

5.9 Fuser

5-21

5.4 Front Cover

5-8

5.10 Duplex Unit

5-23

5.5 Rear Cover

5-10

5.11 Cassette

5-25

5.6 Frame

5-12

5.12 SCF

5-27

DIGITAL LASER PRINTER

Service Manual

5-1

Samsung Electronics

ExplodedView and Parts list

16
15

14-2

14-1

5.1 Main

Service Manual

5-2

Samsung Electronics

ExplodedView and Parts list

Main Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.1-0

ML-2851ND

5.1-1

JC63-01572A

SHIELD-CONTROLLER

SET
1

5.1-2

JC92-01936B

PBA MAIN-CONTROLLER

5.1-3

JC44-00156A

HVPS

5.1-4

JC44-00096A

SMPS-PSP_TYPE2_V2C

5.1-5

JC39-00817A

CBF HARNESS-FUSER AC(SMPS)

5.1-6

JC39-00828A

CABLE FORM CONN COAX

5.1-7

JC39-00824A

CBF HARNESS-HVPS

5.1-8

JC96-04731A

ELA UNIT-RX DRIVE

5.1-9

JC39-00820A

CBF HARNESS-MOTOR & SOLENOID

5.1-10

JC39-00816A

CBF HARNESS-AC-INLET

5.1-11

JC66-01218A

ROLLER-TRANSFER

5.1-12

JC96-04733A

ELA UNIT-LSU

5.1-13

JC96-04736A

MEA UNIT-DUPLEX

5.1-14-1

JC63-01650A

COVER-DUPLEX

5.1-14-2

JC63-01651A

COVER-REAR DUPLEX

5.1-15

JC97-03012A

MEA-COVER TOP

5.1-16-1

JC97-03013A

MEA UNIT-COVER_LEFT

5.1-16-2

JC97-03014A

MEA UNIT-COVER_RIGHT

5.1-16-3

JC97-03015A

MEA UNIT-COVER_REAR

5.1-16-4

JC97-03016A

MEA UNIT-COVER FRONT

5.1-17

JC97-03017A

MEA UNIT-CASSETTE

5.1-18

JC96-04735A

ELA UNIT-SCF

SNA

5.1-19

3903-000085

CBF-POWER CORD(110V)

SNA

5.1-19

3903-000042

CBF-POWER CORD(220V)

5.1-20

JC96-04823B

ELA HOU-DEVE

Service Manual

5-3

Samsung Electronics

ExplodedView and Parts list

5.2 Top Cover

Service Manual

5-4

Samsung Electronics

ExplodedView and Parts list

Top Cover Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.2-0

JC97-03012A

MEA UNIT-COVER_TOP

5.2-1

JC63-01523A

COVER-TOP

SNA

5.2-2

JC61-02230A

STACKER-RX

5.2-3

JC72-01343A

PMO-SUB_M_STACKER

5.2-5

JC63-01528A

COVER-DUMMY KEY

SNA

5.2-7

JC67-00274A

LENS-LED

5.2-8

6107-001169

SPRING-CS

5.2-9

JC64-00359A

KEY-ON_LINE

5.2-10

6003-000196

SCREW-TAPTITE

SNA

Service Manual

5-5

Samsung Electronics

ExplodedView and Parts list

3-1

3-2

5.3 Cover Ass'y

Service Manual

5-6

Samsung Electronics

ExplodedView and Parts list

Cover Ass'y Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.3-0

JC96-04741A

ELA HOU-COVER

5.3-1

JC97-03016A

MEA UNIT-COVER_FRONT

5.3-2

JC97-03013A

MEA UNIT-COVER_LEFT

5.3-3

JC97-03014A

MEA UNIT-COVER_RIGHT

5.3-3-1

JC63-01525A

COVER-RIGHT

SNA

5.3-3-2

JC63-01570A

COVER-RIGHT_DIMM

SNA

5.3-4

JC97-03015A

MEA UNIT-COVER_REAR

Service Manual

5-7

Samsung Electronics

ExplodedView and Parts list

5.4 Front Cover

Service Manual

5-8

Samsung Electronics

ExplodedView and Parts list

Front Cover Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

5.4-0

JC97-03016A

MEA UNIT-COVER_FRONT

5.4-1

JC63-01527A

COVER-FRONT

5.4-2

JB64-00007A

LOCKER-LATCH PUSH

5.4-3

JC63-01569A

COVER-MANUAL

SNA

5.4-4

JC61-02267A

BRACKET-MANUAL

SNA

5.4-5

6003-000282

SCREW-TAPTITE

SNA

Service Manual

Description

5-9

QT'y

Service Remark

Samsung Electronics

ExplodedView and Parts list

5.5 Rear Cover

Service Manual

5-10

Samsung Electronics

ExplodedView and Parts list

Rear Cover Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

5.5-0

JC97-03015A

MEA UNIT-COVER_REAR

5.5-1

JC63-01526A

COVER-REAR

SNA

5.5-2

JC61-02399A

GUIDE-CHANGE_DUP

SNA

Service Manual

Description

5-11

QT'y

Service Remark

Samsung Electronics

Service Manual

5-12

21-1

21-3

21-2

33 32

39
38

26-1

26-3

26-2

26
25

55 56
57 58

6-2

5
6-1

54-4

54-1

54-3
54-2

115

ExplodedView and Parts list

5.6 Frame1

Samsung Electronics

Service Manual

5-13

100
99
98

75 67

101

104
102

105

108

109

110

102

106

107

103

112

114

111

113

ExplodedView and Parts list

Frame2

Samsung Electronics

ExplodedView and Parts list

Frame Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.6-0

JC96-04738A

ELA HOU-FRAME_220V

5.6-1

JC61-02187A

FRAME-BASE

5.6-2

JC63-01616A

GROUND-ZENOR

5.6-3

JC92-01488A

PBA MAIN-ZENER

5.6-4

JC72-00983A

PMO-LOCKER CST

5.6-5

JC31-00085A

FAN-DC

5.6-6-1

JC70-40912A

ICT SHAFT HV LARGE

5.6-6-2

JC61-00031A

SPRING ETC-HV LARGE

5.6-7

JC63-01619A

GROUND-MOTOR_MAIN

5.6-8

JC63-01618A

GROUND-CONTROLLER

5.6-9

JC63-01620A

GROUND-PAPER

5.6-10

JC63-01613A

GROUND-BRKT FRONT

5.6-11

JC63-01621A

GROUND-TRANSFER

5.6-12

JC61-02233A

HOLDER-REGI

5.6-13

JC96-04732A

MEA UNIT SWING

5.6-14

JC66-01651A

GEAR RDCN 23/23

5.6-15

JC61-02220A

COLLAR SWING

5.6-16

JC61-02225A

BRKT SWING

5.6-17

JC66-01655A

SHAFT-FEED REGI

5.6-18

JC66-01865A

CLUTCH ELECTRIC

5.6-19

JC72-00382B

PMO-BUSHING FEED

5.6-20

JC66-01656A

ROLLER-FEED REGI

5.6-21

JC97-03141A

MEA UNIT-GEAR PICK UP

5.6-21-1

JC72-00979A

GEAR PICK UP A

5.6-21-2

6107-001167

SPRING-CS

5.6-21-3

JC72-00980A

GEAR PICKUP B

5.6-22

JC66-01889A

CAM-PICK UP

5.6-23

JC72-00982A

PMO-IDLE PICK_UP

5.6-24

JC66-01692A

SHAFT-P-PICK_UP

5.6-25

JC61-00915A

STOPPER-M-PICK UP_R2

5.6-26

JC97-03062A

MEA UNIT-PICK UP

5.6-26-1

JC73-00265A

RUBBER PICK_UP

5.6-26-2

JC61-00910A

HOUSING-M-PICK UP2_R2

5.6-26-3

JC61-00909A

HOUSING-M-PICK UP_R2

5.6-27

JC61-00587A

BUSH-M-PICK_UP R

5.6-28

JC66-01660A

SHAFT-FEED

5.6-29

JC66-01634A

GEAR-FEED DR 16

5.6-30

JC63-01614A

GROUND-GUIDE TR

5.6-31

6107-001352

SPRING-TS

5.6-32

JC66-00377A

CAM-M-PICK_UP

5.6-33

6044-000001

RING-CS;ID3,OD3,T0.25,BLACK,SU

5.6-34

JC66-40964A

GEAR-EXIT,IDLE(Z17)

5.6-35

JC66-01627A

GEAR-FEED RDCN 24/19

Service Manual

5-14

Samsung Electronics

ExplodedView and Parts list

Frame Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.6-36

JC61-02226A

BRACKET-FEED

5.6-37

JC33-00026A

SOLENOID PCIKUP

5.6-38

6003-000301

SCREW-TAPTITE

5.6-39

JC31-00085A

FAN-DC

5.6-40

JC61-02232A

HOLDER-POWER

5.6-41

JC63-01571A

SHIELD-POWER_SWITCH

5.6-42

JC61-02238A

PLATE-POWER CAP

5.6-43

JC63-01615A

GROUND-SCF

5.6-44

JC92-01439A

PBA LED-PANEL

5.6-45

JC61-02312A

FRAME-LSU-HOLDER-R

5.6-46

JC61-02311A

FRAME-LSU-HOLDER_L

5.6-47

JC61-02310A

FRAME-EXIT_HIGH

5.6-48

JC66-00875A

GEAR-M-FUSER IDLE 1

5.6-49

6044-001005

RING-CS

5.6-50

JC39-00826A

CBF HARNESS-LSU SW&FAN

5.6-52

JC65-00019A

TERMINAL-CRUM

5.6-53

JC92-01829A

PBA SUB-TERMINAL

5.6-54-1

JC61-01172A

HOLDER-M-EXIT F/DOWN

SNA

5.6-54-2

JC66-00824A

ROLLER-EXIT MAIN

SNA

5.6-54-3

JC66-00830A

ROLLER-EXIT FR

SNA

5.6-54-4

6107-001163

SPRING CS

SNA

5.6-55

JC66-40209A

GEAR-M-EXIT

5.6-56

JC72-41191B

PMO-BEARING SHAFT

5.6-57

JC61-02308A

SUPPORT-ROLLER

5.6-59

JC66-01662A

ROLLER-EXIT F/DOWN

5.6-63

JC63-01572A

SHIELD-CONTROLLER

5.6-64

JC63-01573A

SHIELD-SMPS

5.6-65

JC62-00461A

INSULATION-SMPS

5.6-66

JC61-40001A

FOOT-ML80

5.6-67

JC70-00546A

ADJUST-MANUAL L

5.6-68

JC70-00547A

ADJUST-MANUAL R

5.6-69

JC70-00304A

ADJUST RACK-M-MANUAL

5.6-71

JC66-00387A

GEAR-RACK_PINION

5.6-72

JC66-01647A

ACTUATOR-FEED

5.6-73

JC66-01646A

ACTUATOR-DUPLEX

5.6-74

6107-001164

SPRING-TS

5.6-75

0604-001095

PHOTO INTERRRUPTER

5.6-76

JC39-00824A

CBF HARNESS-HVPS

5.6-77

JC61-02309A

FRAME-DUPLEX_PATH

5.6-78

JC66-01022A

ROLLER-M-IDLE SCF

5.6-79

JC66-01846A

SHAFT-DUP_ROLLER

5.6-80

JC61-02303A

GUIDE-FRAME_DUPLEX

5.6-81

JC63-01743A

SHEET-GUIDE_DUP_PATH

Service Manual

5-15

Samsung Electronics

ExplodedView and Parts list

Frame Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.6-82

JC72-00382B

PMO-BUSHING FEED

5.6-83

JC66-00598A

ROLLER-FEED

5.6-84

JC66-01648A

ACTUATOR-EMPTY

5.6-85

JC63-01617A

GROUND-PICK_UP

5.6-86

JC63-00527A

SHEET-BRUSH

5.6-87

JC75-00095A

MEC-BRUSH PICK UP

SNA

5.6-88

JC61-02268A

BRACKET-COVER FRONT

5.6-89

JC63-01676A

GROUND-BRUSH PICK UP

5.6-90

JC61-02306A

GUIDE-PAPER

5.6-91

JC61-02400A

GUIDE FRONT PAPER

5.6-92

JC61-02305A

GUIDE-TR_RIB

5.6-93

JC61-00604B

PLATE-E_SAW

5.6-94

JC61-02307A

GUIDE-TR

5.6-95

JC61-02196A

GUIDE-INPUT

5.6-96

JC61-02236A

PLATE EARTH TRANSFER

5.6-97

JC66-01654A

SHAFT-FEED IDLE

5.6-98

JC61-00585A

BUSH-M-FEED IDLE

5.6-99

JC61-70958A

SPRING ETC-TR

5.6-100

JC61-00914A

PLATE-P-PUSH BUSHING

5.6-101

JC72-00984A

PMO-PLATE GUIDE DEVE_L

5.6-102

JC61-70932A

SPRING ETC-GUIDE DEVE

5.6-103

JC72-00985A

PMO-PLATE GUIDE DEVE_R

5.6-104

6107-001370

SPRING TR

5.6-105

JC61-02468A

BUSH-TR_L

5.6-106

JC65-00033A

TERMINAL SPRING TR

5.6-107

JC61-00588A

PMO-BUSHING_TR(L)

5.6-108

JC61-02304A

GUIDE-HOLDER_TR

5.6-109

JC61-00553A

SPRING ETC-ES (Guide holder TR)

5.6-110

JC61-02231A

HOLDER-TRANSFER

5.6-111

JC66-01649A

LINK-COVER_REAR

5.6-112

6107-001172

SPRING-CS

5.6-114

JC97-03067A

MEA UNIT-GUIDE REAR

5.6-115

JC61-00424A

BUSH-4

SNA

Service Manual

5-16

Samsung Electronics

ExplodedView and Parts list

Service Manual

5.7 Main Drive

5-17

Samsung Electronics

ExplodedView and Parts list

Main Drive Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

5.7-0

JC96-04731A

ELA UNIT-DRIVE

5.7-1

JC61-02195A

BRACKET-GEAR

SNA

5.7-2

JC66-01641A

GEAR-EXIT RDCN 61/28

5.7-3

JC66-01628A

GEAR-RDCN 83/40

5.7-4

JC66-01632A

GEAR-FUSER DR IN 61

5.7-5

JC66-01626A

GEAR-RDCN 89/55

5.7-6

JC66-01633A

GEAR-OPC DR IN 89

5.7-7

JC66-01625A

GEAR-FEED RDCN 56/25

5.7-8

JC66-01640A

GEAR-PICKUP IDLE 31

5.7-9

JC66-01650A

GEAR-RDCN 52/18

5.7-10

JC66-01798A

GEAR-OPC CLUTCH 29

5.7-11

JC66-01637A

GEAR-FUSER DR OUT 37

5.7-12

6031-000023

WASHER-PLAIN

SNA

5.7-13

JC61-02227A

BRACKET-MOTOR

SNA

5.7-14

JC31-00090A

MOTOR BLDC

SNA

5.7-15

6003-000269

SCREW-TAPTITE

5.7-18

6044-001130

RING-C

SNA

5.7-19

JC70-00548A

HUB-CLUTCH

SNA

5.7-20

6107-001372

SPRING CLUTCH

SNA

Service Manual

Description

5-18

QT'y

Service Remark

Samsung Electronics

ExplodedView and Parts list

5.8 Rear Guide

Service Manual

5-19

Samsung Electronics

ExplodedView and Parts list

Rear Guide Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

5.8-0

JC97-03067A

MEA UNIT-GUIDE REAR

5.8-1

JC61-02198A

GUIDE-REAR

SNA

5.8-2

JC66-01661A

ROLLER-IDLE_EXIT

SNA

5.8-3

JC61-02158A

BUSH-TX

SNA

5.8-4

JC66-01584A

SHAFT-EXIT_F/UP

SNA

5.8-5

JC66-01583A

GEAR-EXIT

5.8-6

JC73-00259A

RUBBER-EXIT_F/UP

SNA

Service Manual

Description

5-20

QT'y

Service Remark

Samsung Electronics

Service Manual

5-21
12

36
35

ExplodedView and Parts list

5.9 Fuser

Samsung Electronics

ExplodedView and Parts list

Fuser Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.9-0

JC96-04717A

ELA UNIT-FUSER

5.9-1

JC63-01517A

COVER-FUSER

SNA

5.9-2

JC72-40981A

PMO-ROLLER UPPER DP

5.9-3

JC66-01312A

ROLLER-IDLE

5.9-4

JC70-20901A

IEX-SHAFT IDLE,F/UP

5.9-5

1404-001438

THERMISTOR-NTC ASSY

5.9-6

6003-000196

SCREW-TAPTITE

SNA

5.9-7

4712-001031

THERMOSTAT

5.9-8

6003-000282

SCREW-TAPTITE

SNA

5.9-9

JC63-01536A

GROUND-FUSER

SNA

5.9-10

JC66-01256B

ROLLER-HEAT

SNA

5.9-11

JC66-01254A

GEAR-FUSER

5.9-12

JC61-02334A

BUSH-HR-L

SNA

5.9-13

JC61-02335A

BUSH-HR-R

SNA

5.9-14

JC72-20902A

PEX-ROLLER F/UP(2)

5.9-15

6107-001359

SPRING-ETC

5.9-16

JC61-02154A

GUIDE-CLAW

SNA

5.9-17

JC61-01950A

SPRING ETC-CLAW

5.9-18

6107-001165

SPRING-TS

5.9-19

JC66-01595A

ACTUATOR-EXIT

SNA

5.9-20

JC61-02197A

FRAME-FUSER

SNA

5.9-21

JC66-01663A

ROLLER-PRESSURE

SNA

5.9-22

JC61-02336A

BUSH-PR-1ST

SNA

5.9-23

JC66-01664A

ROLLER-PRESSURE_2ND

SNA

5.9-24

JC61-02337A

BUSH-PR-2ND

SNA

5.9-25

JC66-01598A

LEVER-LINK JAM_R

SNA

5.9-26

JC66-01597A

LEVER-LINK JAM_L

SNA

5.9-27

6107-001246

SPRING-CS

SNA

5.9-28

6044-000159

RING-C

5.9-29

6107-001361

SPRING-ES

5.9-30

4713-001212

LAMP-HALOGEN

5.9-31

JC67-00266A

CAP-LAMP_L

SNA

5.9-32

JC67-00267A

CAP-LAMP_R

SNA

5.9-33

JC66-01638A

GEAR-FUSER RDCN 28-20

5.9-34

JC66-00056A

GEAR-MPF 5

SNA

5.9-35

6031-001051

WASHER-PLAIN

SNA

5.9-36

6044-000001

RING-CS

SNA

5.9-37

0604-001095

PHOTO-INTERRUPTER

Service Manual

5-22

Samsung Electronics

ExplodedView and Parts list

5.10 Duplex Unit

19
20

16
17

18
15

2
3

1
12-1

12-2

4
12-1

12-2
12

5
6

11
7
10

8
9

Service Manual

5-23

Samsung Electronics

ExplodedView and Parts list

Duplex Unit Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.10-0

JC96-04736A

ELA UNIT-DUPLEX

5.10-1

JC61-02188A

FRAME-DUPLEX_BASE

SNA

5.10-2

JC65-00036A

TERMINAL-GND_DUP L

5.10-3

JC65-00035A

TERMINAL-GND_DUP S

5.10-4

JC61-00665A

BUSH-M-FEED, DUP

5.10-5

JC66-01657A

ROLLER-FEED_DUP2

SNA

5.10-6

6044-000107

RING-C

SNA

5.10-7

JC66-00900A

PULLEY-M-18-DUMMY_DUP

5.10-8

JC66-00899A

PULLEY-18_DUP

5.10-9

JC66-00038A

GEAR-EXIT F/DOWN

5.10-10

6602-001589

BELT-TIMING GEAR

5.10-11

6602-001588

BELT-TIMING GEAR

5.10-12

JC96-03662A

ELA UNIT-ROLLER_DUP

SNA

5.10-12-1

JC66-00901A

ROLLER-FEED_DUP

5.10-12-2

6044-000107

RING-C

SNA

5.10-13

JC61-02235A

BRACKET-DUPLEX_ALIGN

SNA

5.10-14

6003-000440

SCREW-TAPPING

SNA

5.10-15

JC61-02314A

GUIDE-DUPLEX_UPPER

SNA

5.10-16

JC66-00896A

ROLLER-M-IDLE_ DUP

5.10-17

JK72-00058A

PCT-SILP WASHER

SNA

5.10-18

JC66-00444A

SHAFT-IDLE ROLL, DUP

5.10-19

6107-001156

SPRING-TS

5.10-20

6003-000196

SCREW-TAPTITE

SNA

Service Manual

5-24

Samsung Electronics

ExplodedView and Parts list

20
18

5.11 Cassette

Service Manual

5-25

Samsung Electronics

ExplodedView and Parts list

Cassette Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.11-0

JC97-03017A

MEA UNIT-CASSETTE

5.11-1

JC61-00876A

FRAME-M_CASSETTE

5.11-2

JC61-00918B

GUIDE-M-EXTENSION L2

5.11-3

JC72-00971A

PMO-EXTENSION SMALL

5.11-4

JC70-00301A

ADJUST-M-CASSETTE_R

5.11-5

JC70-00300A

ADJUST-M-CASSETTE_L

5.11-6

JG66-40003A

GEAR-PINION

5.11-7

6003-000264

SCREW-TAPTITE

5.11-8

JC61-00603A

PLATE-P-KNOCK_UP

5.11-9

JC66-00719A

CAM-M-KNOCK UP

5.11-10

6003-000261

SCREW-TAPTITE

5.11-11

6107-001166

SPRING-CS

5.11-12

JC72-00972A

PMO-PLATE_LOCKER

5.11-13

JG61-70531A

SPRING ETC-LOCKER,PLATE

5.11-14

JC96-04743A

ELA HOU-HOLDER_PAD

5.11-15

JC61-01978A

HOUSING-HOLDER PAD

5.11-16

JC63-01531A

COVER-HANDLE_CASSETTE

5.11-17

6107-001047

SPRING-ES

5.11-18

JC66-00529A

ROLLER-M-IDLE FEED

5.11-19

6003-000196

SCREW-TAPTITE

5.11-20

JC64-00353A

INDICATOR-PAPER

5.11-21

JC63-01670A

SHEET-GUIDE_SIDE_FAR

5.11-22

JC63-01671A

SHEET-GUIDE_SIDE_NEAR

Service Manual

5-26

Samsung Electronics

Service Manual

11-31

9-12

5-27

11-30
11-29 11-21

11-18

9-11

9-6

11-22

11-20

11-27

9-2 9-5

11-28

9-4

9-1
9-3
9-10

11-10

11-16

11-19

11-23

11-26

11-5
11-25

9-7

9-8
9-9

10-3

11-24

10-1
10-2

11-7
11-11

11-8

11-3

11-19

11-8

11-6

11-9

11-17

11-18

11-2
11-4

11-15

11-13
11-14

11-10

11-5

11-12

11-9

11-1

ExplodedView and Parts list

5.12 SCF

Samsung Electronics

ExplodedView and Parts list

SCF Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

Description

QT'y

Service Remark

5.12-0

JC96-04735A

ELA UNIT-SCF

SNA

5.12-1

JC97-03017A

MEA UNIT-CASSETTE

SNA

5.12-2

JC63-01607A

COVER-FRONT_SCF

SNA

5.12-3

JC63-01530A

COVER-RIGHT_SCF

SNA

5.12-4

JC63-01529A

COVER-LEFT_SCF

SNA

5.12-5

JC63-01608A

COVER-REAR_SCF

SNA

5.12-6

JC63-01650A

COVER-DUPLEX

SNA

5.12-7

JC63-01651A

COVER-REAR DUPLEX

SNA

5.12-8

6003-000196

SCREW-TAPTITE

SNA

5.12-9

JC96-04772A

ELA HOU-MOTOR_SCF

5.12-9-1

JC61-02228A

BRACKET-MOTOR_SCF

SNA

5.12-9-2

JC61-02234A

SUPPORT-FEED_SCF

SNA

5.12-9-3

JC66-01785A

GEAR-IDLE 59

5.12-9-4

JC66-00688A

GEAR-61/47 IDLE

SNA

5.12-9-5

JC66-00396A

GEAR-IDLE 23

5.12-9-6

JC66-00690A

GEAR-35 IDLE

SNA

5.12-9-7

JC66-01784A

GEAR-RDCN 57/18

5.12-9-8

JC61-02229A

BRACKET-GEAR_SCF

SNA

5.12-9-9

JC31-00011E

MOTOR STEP

5.12-9-10

JC72-00825A

PMO-IMPELLER_DRV

5.12-9-11

6003-000269

SCREW-TAPTITE

5.12-9-12

6031-000023

WASHER-PLAIN

SNA

5.12-10

JC97-03062A

MEA UNIT-PICK UP

SNA

5.12-10-1

JC61-00909A

HOUSING-M-PICK UP_R2

5.12-10-2

JC73-00265A

RUBBER-PICK_UP

5.12-10-3

JC61-00910A

HOUSING-M-PICK UP2_R2

5.12-11

JC96-04771A

ELA HOU-FRAME_SCF

SNA

5.12-11-1

JC61-02189A

FRAME-SCF

SNA

5.12-11-2

JC63-00369A

SHEET-COVER SENSOR

5.12-11-3

JC70-11028A

IPR-GROUND TOP

5.12-11-4

6003-000196

SCREW-TAPTITE

SNA

5.12-11-5

JC72-00983A

PMO-LOCKER CST

5.12-11-6

JC72-00975A

PMO-ACTUATOR EMPTY

5.12-11-7

JC63-00527A

SHEET-BRUSH

5.12-11-8

JC75-00095A

MEC-BRUSH ANTISTATIC

0.5

5.12-11-9

JC61-40001A

FOOT-ML80

5.12-11-10

JC61-00836A

FOOT-FRONT

5.12-11-11

JC63-01609A

COVER-HARNESS_SCF

SNA

5.12-11-12

JC63-00492A

COVER-M-SIMM R2

5.12-11-13

JC92-01911A

PBA-SCF

5.12-11-14

JC63-01636A

GROUND-PAPER_SCF

SNA

5.12-11-15

JC63-01635A

GROUND-BRUSH_SCF

SNA

5.12-11-16

JC33-00026A

SOLENOID-PICK UP

Service Manual

5-28

Samsung Electronics

ExplodedView and Parts list

SCF Parts List
SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

Drawer#

SEC_Code

5.12-11-17

JC61-00587A

BUSH-M-PICK_UP R

5.12-11-18

JC61-00915A

STOPPER-M-PICK UP_R2

5.12-11-19

JC72-00982A

PMO-IDLE PICK_UP

5.12-11-27

JC66-00394A

GEAR-FEED 2

5.12-11-29

JC72-00980A

PMO-GEAR PICK_UP B

5.12-11-31

6107-001170

SPRING-TS

5.12-21

JC61-00586A

BUSH-M-PICK_UP L

5.12-22

JC66-01653A

SHAFT-FEED_SCF

SNA

5.12-23

JC66-00598A

ROLLER-FEED

5.12-24

JC72-00382B

PMO-BUSHING FEED

Service Manual

Description

5-29

QT'y

Service Remark

Samsung Electronics

Service Manual

Front Cover
Micro Switch

HVPS

Varistor

24V

SMPS

THV

Main
S/W

Supply

24VS

6-1

OPC

M
C
R
U
M

MHV

ThermoStat

Thermistor

DEVELOPER Unit

DRUM

INLET

DEV

Rear Cover
Micro Switch

FUSER Unit

FUSER ON

5V
24V

FAN
LSU

FAN
MAIN

24VS

5V
24V
VCLK
12MHz

MCLK
12MHz

Regist
Clutch

SDRAM
SODIMM
K4S561632
(32MB X 4EA)
Factory Option

MAIN

PickUp
Clutch

SOL

LSU

Main
Motor

MT
BLDC

SPGPv3

LSU
INTERLOCK
S/W

Empty
Sensor

FEED
Sensor

LED2

EEPROM
M24C32W X 2EA

NOR Flash
S29GL320M
(4MB X 2EA)

SDRAM
K4S281632
(16MB X 2EA)

LED1

OPE

REGI_DUP PaperExit
Sensor
Sensor

KEY

SCF
(Option)

USB 2.0
Isp1582

12MHz

Network
BCM5241

25MHz

System Diagram

6. System Diagram

6.1 Block Diagram

Samsung Electronics

Front Cover
Micro Switch

Varistor

SMPS

THV

Main
S/W

M
C
R
U
M

MHV

DEVELOPER Unit

OPC

DRUM

INLET

DEV

FUSER Unit

CN6
THER & P_EXIT
SENSOR

FAN_MAIN
NC
24VS

1
2
3

FAN_LSU

3.3V
DEV _DIO
DEV _CLK
GND

24VSN

4
3
2
1

LSU_5V
5V

4
3

VCLK
12MHz

CN2
MAIN MOTOR & PICKUP, REGI CLUTCH

SPGPv3

1
2
3

EXIT
Sensor

SOL

PickUp
Clutch

CL
Regist
Clutch

1
2
3
4
5
6
7
8
9
10

EMPTY REGI_DUP FEED
Sensor
Sensor Sensor

1
2
3

Main
Motor

CN13
SENSOR

1
2
3

BLDC

CN10
SMPS _IF

1
2
3

ThermoStat

Thermistor

FAN
MAIN

FAN
LSU

LSU
INTERLOCK
S/W

CN1
LSU_IF

THE R1
THE R2
1
2

Supply

MCLK
12MHz

LSU S/ W & FA N

CN3
CN8
3. 3V
GND
P AP ER_E XI T
3
4
5

CRUM

24V S
11

CN12

P ICK UP _CLT
12

FAN_MAIN

24V S
13

Rear Cover
Micro Switch

MAIN

1
2
3
4
5
24V S
G ND
P_M OT_EN
LSU_RDY
P_M OT_CLK

RE GI_CLT
14

24VS

6
7
8
9
10
11
12
13
14
15
LD_EN
LD_P OWER1
G ND
HSY NC1
LSU_SH1
G ND
VDO1_m inus
V DO 1_pl us
G ND
LS U_5V
M OT_DIR
P WM_M OT
M OT_REA DY
M OT_EN
NC
M OT_BRE AK
GND
GND
24V S
24V S
1
2
3
4
5
6
7
8
9
10

24V

3. 3V
GND
DUX_S ENS

HVPS

3. 3V
GND
FE ED_S ENS

1
2
3
4
5
6
7
8
9
10
11
12
13
14

SCF
(Option)

USB 2.0
Isp1582

12MHz

Network
BCM5241

25MHz

EEPROM
M24C32W X 2EA

NOR Flash
S29GL320M
(4MB X 2EA)

SDRAM
K4S281632
(16MB X 2EA)

HVPS _IF

CN4

G ND
G ND
PWM _DEV _DC
P WM _M HV
THV _RE AD
P WM _M HV
nT HV _EN
PWM _THV
5V
24V S
24V S
G ND
G ND
24V
24V

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3

DCU

24V S
F US E R_ON
G ND
24V
G ND
24V
G ND
24V
G ND
24V
G ND
5V
G ND
5V
G ND
5V
3. 3V
GND
RE GI_S ENS
4
5
6

6-2

7
8
9

PANEL

CN18

CN17
CN9 NETWORK_IF

1
2
3
4
5

CN11

Service Manual
1
2
3
4
5
6
7
8
9
10
1
2
3
4

1
2
3
4
5
6
7
8
9

24VS
3.3V
3.3V
SCF _RXD
nSCF _DET
SCF _TXD
GND
GND
GND

1
2
3
4

1
2
3
4
5

1
2
3
4
5
6
7
8
9
10
11
12

VBUS
DM
DP
GND

GND
NC
RD 3.3V
RD +
TD3.3V
TD+
3.3V P /U
LED2
3.3V P /U
LED1

3. 3V
DCU _DATA
DCU _CLK
GND

KEYCLIK
LED_T
LED_E
LED_R
GND

LED1

USB_IF

KEY

CN14 SCF_IF

LSU

System Diagram

6.2 Connection Diagram
OPE
LED2

Samsung Electronics

Reference information

7. Reference Information
This chapter contains the tools list, list of abbreviations used in this manual, and a guide to the
location space required when installing the printer. A definition of tests pages and Wireless
Network information definition is also included.

7.1 Tool for Troubleshooting
The following tools are recommended safe and easy troubleshooting as described in this service manual.

• DCU (Diagnostic Control Unit)

• Cotton Swab
Standard : For general home use, for medical service.

Standard : Test equipment to diagnose the Laser
printer supplied by Samsung Electronics.

• Cleaning Equipments
Standard : An IPA(Isopropyl Alcohol)dry wipe tissue or
a gentle neutral detergent and lint-free cloth.

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

• Vacuum Cleaner

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

• Software (Driver) installation CD ROM

• Tweezers
Standard : For general home use, small type.

Service Manual

7-1

Samsung Electronics

Reference information

7.2 Acronyms and Abbreviations(1)
The table below explains the abbreviations and acronyms used in this service manual. Where abbreviations
or acronyms are used in the text please refer to this table.
Abbreviations
AP

Explanation
Access Point

Alternating Current

APC

Auto Power Control

ASIC

Application Specific Integrated Circuit

ASSY

assembly

BIOS

Basic Input Output System

BLDC

Brush-less Direct Current

CMOS

Complementary Metal Oxide Semiconductor

connector

CON

connector

CPU

Central Processing Unit

decibel

dBA

decibel A

dBM

decibel milliwatt

direct current

DCU

Diagnostic Control Unit

DPI

Dot Per Inch

DRAM

Dynamic Random Access Memory

DVM

Digital Voltmeter

ECP

Enhanced Capability Port

EDC

Embedded Diagnostic control

EEPROM

Electronically Erasable Programmable Read Only Memory

EMI

Electro Magnetic Interference

electrophotographic

EPP

Enhanced Parallel Port

FPOT

First Printout Time

F/W

firmware

GDI

graphics device interface

GND

ground

HBP

Host Based Printing

HDD

Hard Disk Drive

H/H

High temperature and high marshy place

high voltage

HVPS

High Voltage Power Supply

I/F

interface

I/O

Input and Output

integrated circuit

IDE

Intelligent Drive electronics or Imbedded Drive Electronics

Service Manual

7-2

Samsung Electronics

Reference information

Acronyms and Abbreviations(2)
Abbreviations
IEEE

Explanation
Institute of Electrical and Electronics Engineers. Inc

IPA

Isopropy Alcohol

IPM

Images Per Minute

LAN

local area network

pound(s)

LBP

Laser Beam Printer

LCD

Liquid Crystal Display

LED

Light Emitting Diode

L/L

Low temperature and low marshy place

LSU

Laser Scanning Unit

megabyte

MHz

megahertz

MPF

Multi Purpose Feeder

NIC

Network Interface Card

N/N

Normal temperature and normal marshy place

NVRAM

nonvolatile random access memory

OPC

Organic Photo Conductor

Operation Panel Equipment

PBA

Printed Board Assembly

PCL

Printer Command Language , Printer Control Language

PDL

Page Discription Language

PPM

Page Per Minute

PPS

Pulse Per Second

Post Script

PTL

Pre-Transfer Lamp

PWM

Pulse Width Modulation

Q-PID

Quick Printer Initiating Device

Q ty

quantity

RAM

Random Access Memory

ROM

Read Only Memory

SCF

Second Cassette Feeder

SMPS

Switching Mode Power Supply

SPGP

Samsung Printer Graphic Processor

SPL

Samsung Printer Language

Spool

Simultaneous Peripheral Operation Online

switch

sync

synchronous or synchronization

USB

Universal Serial Bus

WECA

Wireless Ethernet Compatibility Alliance

Service Manual

7-3

Samsung Electronics

Reference information

7.3 Select a location for the printer
• Leave enough room to open the printer trays, covers, and allow for proper ventilation. (see diagram
below)
• Provide the proper environment :
- A firm, level surface
- Away from the direct airflow of air conditioners, heaters, or ventilators
- Free of extreme fluctuations of temperature, sunlight, or humidity
- Clean, dry, and free of dust

Service Manual

7-4

Samsung Electronics

Reference information

7.4 Sample Tests Patterns
The sample patterns shown below are the standard test patterns used in the factory.
The life of the toner cartridge, developer cartridge and printing speed are measured with the pattern shown
below (5%). The A4 ISO 19752 standard pattern samples are reproduced reduced to 70% of the actual A4
size.

Service Manual

7-5

Samsung Electronics

Reference information

7.5 LAN (Network Model)
• This product can be used with a wired LAN (Option)
• LED Condition and Status

[LED STATUS]
LED Condition

RJ-45 Jack
Link LED(Green)

Status

Active LED random blink

Normal NPC &Normal packet receive

Active LED regular blink

Normal NPC &No Packet

Active LED Off/On maintenance NPC Initial inferiority
Link LED On

The link LED On, Normally linked

Link LED Off

Link LED off, Link Inferiority

Active LED(Orange)

7.6 Information of model's code
No.
1
2
3
4

Service Manual

Model code
ML-2850D
ML-S2850A
ML-2851ND
ML-D2850A/B

Description
Mono Laser printer,28ppm/Duplex
ELA UNIT-SCF
Mono Laser printer,28ppm,Network,Duplex
2/5K Toner Cartridge

7-6

Remark
Basic model
Option model
Basic model
High yield

Samsung Electronics

Reference information

7.7 Parts Life Cycle Maintenance Table
7.7.1 Parts Life Cycle Maintenance Table
Supplies

Life-Cycle

Condition

Engine-Codition

LCD- Indication

Custmoer Panel Manage

Responding

Toner
Cartridge

2K : For Product
5K :For Sale

Toner Low

Warning

None LCD

10% Remains

Toner Empty

Warning

None LCD

Initialized at toner

Toner uninstalled

change

Fuser

50K(page):
Simplex

Exhauseted

No Indication

None LCD

Replaced at
Exhauseted

Transer
Roller

50K(page):
Simplex

Exhauseted

No Indication

None LCD

Replaced at
Exhauseted

PickUP
Roller

50K(page):
Simplex

Exhauseted

No Indication

None LCD

Replaced at
Exhauseted

7.7.2 Toner Cartridge Criterion
1) Supplies Criterion (Toner Cartridge)
1. Cartridge Main Defects
- White Point, Black Point : White or Black point on printing image
- Image contamination : Dirty printing image
- Image Fainted : Entire Image is fainted and vertical white line emerge
- Black Line : Vertical black line emerge on printing image
2) Defect Symptoms
Symptoms

Criterion

Remarks

White, Black Point

Clean Up OPC (10 times), if disappeared, no failure.
- If continuous, failure

Image contamination

Drity printing image or conteminated reverse side

(Toner leakage)

- Clean up OPC (10 times) and inside of machine with cloth,
if disappeared, no failure.

Image Fainted

After shake cartridge right and left 5~6 times, if printing image
is not fainted, no failure. (Toner Exhausted)

Vertical Black Line

Vertical thin line emerge, if cartridge is scratched.
- (Customer fault)

Service Manual

7-7

Samsung Electronics

Reference information

7.8 Model Information
7.8.1 Understanding for Model Code
Model code is inscribed and managed by product standard operation.
If understand the standard operation. It will help to comprehend basic and derived model.
Classification
DIGIT
Example
Definition

Code
Description

Model abbriviation
1

Feature/Properties
4

Product Classification

7
5

Color
Division 1. Speed of Engine
Product
between
Classification
code
- If same speed models
are released
Printer
Laser
• Default=
simultaneously higher
Class of
Beginning Omissoin
model is added +1 at
Product
letter of
• Only color
speed code.
Description printer
printer "C"
- If over 10 models with
:C
Description: initial
same speed are
L
• Engine=E
brought into, tenth
model is added +1.

Description

Service Manual

Alphabet

Main feature
Space
description
(Basic:
- N : N/W
Omitted)
- Over 3rd grade
- Below 4th grade
- P : PS
project
project
- S : N/W+PS
• PC Bundle
- B : Bluetooth
2. Valuablet model divi- • Domestic distribution
- T : 2nd CST
sion in market despite (Entry model excepted) - M : Mac Compatible
of not over 3rd grade
- X : Scanner
• Beside abovefeature
- VE model, etc.(Valuable
description,product
conception to product
model is decided
planning group
2. Domestic Entry Model byproduct planning
Distribution
group with sales
responsed
prospect)
- C&C : Engine speed
- Information : The first
number deleted

1. New model,series
model division

Digit

7-8

1. Basic : 0
2. Series model division

Alphabet

Samsung Electronics

Reference information

7.8.2 Understanding Material Code & Name
Material code and name is maintained by standard criteria.
If understand the criteria, it will help to order materials.
1. Two different description ways for material code. ( : Digit,
- Type 1
- Type 2

: Letter(Alphabet))

ex) 2007-007961
ex)JB96-01268A

R-CHIP
ELA UNIT-COVER TOP

Type1 : Parts managed by entire divisions : Materials used by all samsung products.
Most electrical parts are under the type 1.
Type 2 : Parts managed by a division : Material used by a certain product
Most mechanical parts are under type 2.
2. A/S Only material : Only for A/S, not related to product manufacturing.
3. Ass'y material : More than two materials are assembled. If the material order is out of service, the order
can be processed by Ass'y material order.
Picture and numbers are also described on Service manual.
Ass'y Material and A/S Only material Code are recognizable by product name.
Those are under type 2 and known by material properties and beginning letters of product name.
Classification

Material Code

Material Name

A/S Only Material

**81-******(JB81-00039A)

AS-*****(AS-FUSE)

A/S Only Material

**75-******(JB75-00068A)

MEC-*****(MEC-CHUTE)

A/S Only Material

**92-******(JB92-01131A)

PBA-*****(PBA MAIN-CONTROLLER)

A/S Only Material

**96-******(JB96-01268A)

ELA-*****(ELA UNIT-COVER TOP)

A/S Only Material

**97-******(JB97-01089A)

MEA-*****(MEA UNIT-PULLEY IDLE)

Service Manual

7-9

Samsung Electronics

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