Samsung ML-2850D Service manual

DIGITAL LASER PRINTER

ML-2850 Series

ML-2850D / ML-2851ND

ML-2851ND/XAZ

Basic Model : ML-2851ND

SERVICE

Manual

DIGITAL LASER PRINTER 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

Contents

1. Precautions

1.1 Safety Warning

1.2 Caution for safety

1.3 ESD Precautions

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

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

1-1

1-2

1-5

2-1

2-1

2-1

2-7

2-9

2-9

2-12

2-17

2-27

3-4

3-5

3-6

3-7

3-1

3-2

3-3

3-3

3-8

3-9

3-10

Continued

3.9 Transfer Roller 3-11

4. Alignment & Troubleshooting

4.1 Alignment and Adjustments

4.1.1 Sample Pattern

4.1.2 Control Panel

4.1.3 Consumables and Replacement Parts

4.1.4 LED Status Error Message

4.1.5 Abnormal Image Printing and Defective Roller

4.1.6 How to use DCU

4.1.7 Paper Jam

4.1.8 Download & Reset F/W

4.2 Troubleshooting

4.2.1 Procedure of Checking the Symptoms

4.2.2 The cause and solution of Bad image

4.2.3 The cause and solution of the bad discharge

4.2.4 The cause and solution of the malfunction

4-38

4-46

4.2.5 Toner Cartridge Service 4-56

4.2.6 The cause and solutions of bad environment of the software 4-58

4-7

4-8

4-9

4-15

4-20

4-21

4-21

4-22

4-1

4-1

4-4

4-7

5. Exploded Views & Parts List

5.1 Main

5.2 Top Cover

5.3 Cover Ass'y

5.4 Front Cover

5.5 Rear Cover

5.6 Frame

5.7 Main Drive

5.8 Rear Guide

5-10

5-12

5-17

5-19

5-2

5-4

5-6

5-8

Continued

5.9 Fuser

5.10 Duplex Unit

5.11 Cassette

5.12 SCF

6.1 Block Diagram

6.

2 Connection Dia ram

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

5-21

5-23

5-25

5-27

6-1

6-2

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 LASER-

SÄTEILYLLE ÄLÄ KATSO SÄTEESEEN.

1-1

Service Manual

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.

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.


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.


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.


1-5

Samsung Electronics

Product spec and feature

2. Product specification and feature

2.1 Product Specifications

2.1.1 Product Overview

28ppm(A4) / 30ppm(Ltr)

PCL6, PS3, 1,200x1,200dpi

400MHz processor

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

ML-2850D/2851ND

2K Standard, 5K High Yield

Paper Input: 250 CST + 1 MP

Standard Duplex Printing

(World Smallest)

Options:

- 250 sh SCF

32MB (Max.160MB : factory 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

Engine Speed

Warmup time

FPOT

Resolution

Simplex

Duplex

From Sleep

From Ready

-

From Sleep

ML-2850D

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

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

15 sec

8.5 sec less than 23.5 sec

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

ML-2851ND

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

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

15 sec

8.5 sec less than 23.5 sec

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

2-1


Samsung Electronics


2.1.2.2 Controller & S/W

ITEM

Processor

Memory

Printer Languages

Fonts

Driver

Wired Network

Wireless Network

Application

-

Std.

Max.

-

Default Driver

Install

Supporting OS

WHQL

Compatibility

Protocol

Supporting OS

ML-2850D

Samsung 400 MHz

32 MB

160MB(factory option)

SPL

SPL, PCL6, PS3

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

Windows 2000, XP, 2003 Server,

Vista(32/64bits)

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

N/A

N/A

ML-2851ND

Samsung 400 MHz

32 MB


PostScript3, PCL6, SPL, IBM ProPrinter, PostScript3, PCL6, SPL, IBM ProPrinter,

EPSON EPSON

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

SPL

SPL, PCL6, PS3

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

Windows 2000, XP, 2003 Server,

Vista(32/64bits)

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

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

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

Supporting OS

Smart Panel

Printer Setting

Network Management N/A

IP Setting N/A

N/A

N/A

N/A

N/A

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

PSU for Windows/ Macintosh/LINUX PSU for Windows/ Macintosh/LINUX

SyncThru Web Admin Service 4.0

SetIP

Interface

Parallel

USB

Wired Network

Wireless Network

User Interface

LCD

LED

Key -

-

-

-

-

-

-

N/A

Hi-Speed USB 2.0

N/A

N/A

N/A

2 LED, 1 Key

1 Key (Demo, Stop)

N/A

Hi-Speed USB 2.0

Ethernet 10/100 Base TX (Internal)

N/A

N/A

2 LED, 1 Key

1 Key (Demo, Stop)

2-2


Samsung Electronics


2.1.2.3 Paper Handling

ITEM

Standard Capacity -

Max. Capacity

Printing

-

Max. Size

Min. Size

Multi-purpose tray

Capacity

Media sizes

Plain Paper

-

Envelope

Media type -

Media weight

Sensing

-

-

Standard Cassette Tray

Capacity

Media sizes -

-

Media types -

Media weight

Sensing

Optional Cassette Tray

-

-

Capacity

Media sizes -

-

Media types

Media weight

Sensing

Output Stacking

Capacity

-

-

-

Face-Down

Output Full sensing -

Face-Up

Duplex

Supporting -

Media sizes

Media types -

-

Media weight

Printable Area

-

Non-Printable Area Envelope

Other Media

ML-2850D

250-sheet Cassette Tray, 1-sheet Multi

Purpose Tray @80g/

501 sheets @ 80g/

216 x 356 mm (8.5" x 14")

76 x 127 mm (3.0" x 5.0")

ML-2851ND

250-sheet Cassette Tray, 1-sheet Multi

Purpose Tray @80g/

501 sheets @ 80g/

216 x 356 mm (8.5" x 14")

76 x 127 mm (3.0" x 5.0")

1 sheets @ 80g/ 1 sheets @ 80g/

1 sheets @75g/ 1 sheets @75g/

A4, A5, A6, Letter, Legal, Folio, Oficio, A4, A5, A6, Letter, Legal, Folio, Oficio,

Executive,ISO B5, JIS B5, 3"x5", Monarch, Executive,ISO B5, JIS B5, 3"x5", Monarch,

No.10, DL, C5, C6 No.10, DL, C5, C6

Plain Paper, Transparency, Envelope,

Labels, Post Card, Card stock

Plain Paper, Transparency, Envelope,

Labels, Post Card, Card stock

16~43lb (60 to 163g/ )

N/A

16~43lb (60 to 163g/ )

N/A

250 sheets @ 80g/

A4, A5, Letter, Legal, Executive, Folio,

Oficio, ISO B5, JIS B5

Plain paper

16~28lb (60 to 105g/ )

Paper empty sensor

250 sheets @ 80g/



Plain paper

16~28lb (60 to 105g/ )

Paper empty sensor

150 sheets @ 75g/

250 sheets @ 80g/



Plain paper

16~28lb (60 to 105g/ )

Paper empty sensor

250 sheets @ 80g/



Plain paper

16~28lb (60 to 105g/ )

Paper empty sensor

150 sheets @ 75g/

N/A

N/A

N/A

N/A

Built-in

A4, Letter, Legal, Folio, Oficio

Plain Paper

20~24lb (75 to 90g/ )

Built-in

A4, Letter, Legal, Folio, Oficio

Plain Paper

20~24lb (75 to 90g/ )

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

Right)


Right)


Right)


Right)

2-3


Samsung Electronics


2.1.2.4 Consumables

ITEM

Toner

Drum

Black

Key

Life detect

Yield

ML-2850D ML-2851ND

Standard: Average Cartridge Yield 2K standard pages.

Standard: Average Cartridge Yield 2K standard pages.

High Yield: Average cartridge Yield 5K standard pages.

High Yield: Average cartridge Yield 5K standard pages.

Declared cartridge yield in accordance with Declared cartridge yield in accordance with

ISO/IEC 19752.

ISO/IEC 19752.

Electronic key(CRUM) Only

Toner gauge sensor by dot count

N/A

Electronic key(CRUM) Only

Toner gauge sensor by dot count

N/A

2.1.2.5 Reliability & Service

ITEM

Max. Monthly Duty -

MPBF -

MTTR -

SET Life Cycle -

RDS Comm. Mode

Operation

ML-2850D

30,000 sheets

35,000 sheets

30 min.

100,000 sheets or 5 years

(whichever comes first)

Yes

Yes

ML-2851ND

30,000 sheets

35,000 sheets

30 min.

100,000 sheets or 5 years

(whichever comes first)

Yes

Yes

2.1.2.6 Environment

ITEM

Operating

Environment

Acoustic Noise

Level(Sound

Temperature

Humidity

Printing

Standby

Power/Pressure) Sleep

Power Consumption Ready

AVG.

Sleep / Power Off

Dimension

(W x D x H)

Weight

SET

SET

ML-2850D

10C to 32C

20% to 80%

Less than 50dBA

Less than 26.0 dBA

Back Ground Level

Less than 60W

Less than 400W

Less than 8W / Less than 0.4W

(Conformity to EPA)

364 x 369 x 209.6 mm

(14.33" x 14.523" x 8.25 ")

7.87 Kg

ML-2851ND

10C to 32C

20% to 80%

Less than 50dBA

Less than 26.0 dBA

Back Ground Level

Less than 60W

Less than 400W

Less than 8W / Less than 0.4W

(Conformity to EPA)

364 x 369 x 209.6 mm

(14.33" x 14.523" x 8.25 ")

7.87 Kg

2-4


Samsung Electronics


2.1.2.7 Packing & Accessory

ITEM

In-Box -

ML-2850D

Driver & Network Install CD-ROM

Power Cable

USB Cable (CIS/China/Korea/India)

Quick Install Guide

Warranty Registration Card

User's Manual (PDF File)

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

Memory

Second Cassette

Wired Network

Wireless Network

Hard Disk

Duplex Unit

-

-

-

-

-

-

ML-2850D

Factory option (128MB)

250-sheet Cassette Tray

N/A

N/A

N/A

Standard

ML-2851ND

Factory option (128MB)

250-sheet Cassette Tray

N/A (Built-in)

N/A

N/A

Standard

2.1.2.9 Others

ITEM

Memory

Sensor

Service

Certification

Performance

ML-2850D

Upgradable Mem. Slot N/A

Upgradable Mem. Type N/A

Upgradable Mem. Unit 128MB(factory option)

Paper Empty

Paper Size

YES

NO

Media Type

Paper Full

NO

NO

Service Item & Period 1. Transfer Roller : 50K pages

2. Fuser Unit : 50K pages

3. Pick-up Roller : 50K pages

Power FCC Part 15 Class B

ICES-003

EN55022 Class B

Jam Rate Base Line Paper : 1/5K

Speed

Resolution

Standard Paper : 1/2.5K

Stress Paper : 1/1500

Be equal or better than E250DN


ML-2851ND

N/A

N/A


YES

NO

NO

NO

1. Transfer Roller : 50K pages

2. Fuser Unit : 50K pages

3. Pick-up Roller : 50K pages

FCC Part 15 Class B

ICES-003

EN55022 Class B

Base Line Paper : 1/5K

Standard Paper : 1/2.5K

Stress Paper : 1/1500



2-5


Samsung Electronics


2.1.2.10 Reliability & Service

* Periodic Replacing Parts

Parts Parts

1 Transfer Roller JC66-01218A

2

3

Pick -up Roller JC97-03062A

Fuser Unit

JC96-04717A(220V)

JC96-04718A(110V)

50,000

50,000

50,000


2-6

Samsung Electronics


2.1.3 Model Comparison Table

2.1.3.1 SEC Model

Samsung Samsung

ML-2851ND ML-2250

Image

Print Speed

Resolution

Processor

Memory (Max.)

Emulation

Interface

Paper Input

28 ppm/A4

1,200 dpi class

400 MHz

32 MB (160 MB)

PCL6, PS3

USB 2.0, N/W

150 CST

FPOT (C/M)

Noise

30 sec/8.5 sec

50 dBA

Toner 2K/5K

Dim. (WDH) 364 x 369 x 209.6mm

Options 250 SCF, Memory (factory option)

20 ppm/A4

600 dpi class

166 MHz

16 MB (144 MB)

PCL6

USB 2.0, N/W IEEE1284

150 CST

50 sec/10 sec

51 dBA

3K/5K

358 x 452 x 278mm

250 SCF, Memory


2-7

Samsung Electronics


2.1.3.2 Competitor Model

Samsung Brother Lexmark

ML-2851ND HL-5240 E250D

Image

Print Speed

Resolution

Processor

Memory (Max.)

Emulation

Interface

Paper Input

FPOT (C/M)

28 ppm/A4

1,200 dpi class

400 MHz

32 MB (160 MB)

PCL6,PS3

USB 2.0, N/W

250 CST

30 sec/8.5 sec

Noise 50 dBA

Toner 2K/5K

Dim. (WDH)

Options

364 x 369 x 209.6mm

250 SCF,

Memory (factory option)

30 ppm/Ltr

1,200 dpi class

264 MHz

16 MB (16 MB)

PCL6,PS3

USB 2.0, N/W

250 OT

20 sec

47 dBA

2K/2.5K

407 x 453 x 370mm

250 SCF

30 ppm/Ltr

600 x 600 dpi

300 MHz

64 MB (576 MB)

PCL6,PS3

USB 2.0, N/W

250 CST

N/A

N/A

1K/2K

420 x 424 x 432mm

250/500 SCF,

Memory


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Samsung Electronics


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

3

4

1

2

5 output tray control panel control board cover front cover manual tray


* The figure above shows an ML-2851ND.

8

9

6

7

10 tray 1 optional tray 2 paper level indicator output support manual tray paper width guides

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Samsung Electronics

2.2.1.2 Rear View


2

3

USB port optional tray 2 cable connector a. ML-2851ND only.

* The figure above shows an ML-2851ND.

5

6 power receptacle power switch


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Samsung Electronics

2.2.1.3 Control Panel


1

2

3

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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Samsung Electronics

2.2.2 System Layout


FUSER

DUPLEX

CASSETTE

LSU

DEVE


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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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

-1.25KV ~ -1.45KV

1

8

Cleaning Blade

6

-750V

-130V

4

-

+

-250V

3

V

D

= -430V

5

V

S

= -680V

+4.2kV

7

<Toner Cartridge Layout>

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Samsung Electronics


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.

SDRA

M

HVPS CN4

( 24V : 13 14

Network

Interface & IC

EEPRO

M

USB

Port &

SMPS CN10

( 24V : 4 6 8 10

ASIC

U8

DC to DC

Converter

DC to DC

Converter

NOR Flash

U17, U18


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Samsung Electronics


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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Samsung Electronics


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 sub-

CRUM 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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Samsung Electronics


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.

H

L

IN 0, 2

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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Samsung Electronics


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)


- Output Voltage : -1.3KV ~ -1.8KV DC 50V



- 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)


- Output Voltage: -200V ~ -600V DC 20 V

- Output Voltage Fluctuation range: PWM Control

- Input contrast of the output stability degree : 5 % or less




- 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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Supply

- Output Voltage : -400 V ~ -800V DC 50 V(ZENER using, DEV )

- Input contrast of the output stability degree : under 5 %




- Output Loading range : 10 M ~ 1000 M

- Output Control Signal (BIAS-PWM) : the CPU is HV output when PWM is low.

SW2

( Rear-Cover

CN1

(Main PBA CON.)

( Front -Cover

Open Switch )

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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8

9

6

7

3

4

5

NO

1

2

ITEM

CHANNEL NAME

CONNECTOR PIN

CH1

+5V

CON 35V PIN: 11,13,15

GND PIN: 12,14,16

Rated Output

Max. Output Current

Peak Loading Current

+5V 5%(4.75 5.25V)

3 A

3.6 A

RIPPLE NOISEVoltage 100mVp-p

Maximum output 15W

Peak output

Protection for loading shortage and overflowing current

18W

Shut down or Fuse

Protection

CH2

+24.0V

CON 324V PIN:3,5,7,9

GND PIN:4,6,8,10

+24V 10%(21.6 26.4V)

4.4 A

5.3 A

Under 500mVp-p

105.6W

127.2W

Shut down or Output

Voltage Drop

Remark

1ms

1ms

NO

1

2

3

ITEM

Stand-By

PRINTING

Sleep-Mode

System

Less than 60W

Less than 400W

Less than 8W

220V : 250V 8A

110V : 250V 10A

CON1

(AC POWER

CON2

(Main PBA CON.)

24V : 3 5 7 9

5V : 11 13 15


F02

250V 3.15A

F71

250V 4A

F72

250V 4A

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Samsung Electronics


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

- Maintaining temperature range : -25

40

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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Samsung Electronics


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

JAM 1

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.

- 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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Samsung Electronics


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

OPEN HEAT ERROR

LOW HEAT ERROR

OVER HEAT ERROR

Description

- When warming up, it has been lower than 90 over 20 seconds

- 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.

- 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 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

Polygon Motor Error

Hsync Error

Description

Whenthe polygon motor speed doesn t become steady

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


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Samsung Electronics


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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Samsung Electronics

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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Samsung Electronics


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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Samsung Electronics

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:

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.

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.


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Samsung Electronics

3.2 Used Screw List

1

2

6003-000196

6003-000261

DUPLEX UNIT

FRAME

FUSER

ENGINE

COVER TOP

CASSETTE

CASSETTE

3

4

6003-000264 FRAME

CASSETTE

6003-000269 DRIVE

5 6003-000282 DUPLEX UNIT

FRAME

FUSER

FRONT COVER

LSU

6 6003-000301 FRAME

7 6003-001256 ENGINE

8 6006-001078 FRAME

9 6002-000440 Duplex 1, Frame 13


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






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

1

9

3

63

1

2

1

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

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

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

1

11

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







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

10

2

4

1

1

SCREW-TAPTITE;BH,+,B,M4,L10,NI PLT,SWRCH18A 4

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

SWRCH18A,-

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

1

1

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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


3.8 HOLDER-PAD Disassembly

1. Remove the CASSETTE from SET.

2. Disassemble HOLER-PAD after putting out three HOOKs


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Samsung Electronics


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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Samsung Electronics

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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Samsung Electronics


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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Samsung Electronics



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Samsung Electronics

4.1.2 Control Panel

4.1.2.1 Control Panel


1

2

3

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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Samsung Electronics


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:

• SyncThru TM Web Admin Service: A web-based printer management solution for network administrators. SyncThru TM

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.

• SyncThru TM 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 Requirements

Network interface • 10/100 Base-TX

Network operating system • Windows 2000/XP(32/64 bit)/2003/Vista

Network protocols

• 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

Dynamic addressing server

• 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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Samsung Electronics


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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Samsung Electronics


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

Pick-up Roller

Transfer Roller

Fuser

Toner Cartridge

REPLACEMENT CYCLE

50K Pages

50K Pages

50K Pages

2K Pages(Initial

/Sales), 5K Pages(Sales)

4.1.4 LED Status Error Message

4.1.4.1 Status LED

Status Description

Error Red On • 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.

Online

Orange

Green

Blinking

On

On

Blinking

• The toner is totally exhausted.

Remove the old toner cartridge and install a new one.

• 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.

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

• The printer is in power save mode.

• The printer is on-line and can receive data from the computer.

• 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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Samsung Electronics


4.1.5 Abnormal Image Printing and Defective Roller

If abnormal image prints periodically, check the parts shown below.

7-2

7-1

4

5

6

7-1

7-2

No

1

2

3

Roller

OPC Drum

Charge Roller

Supply Roller

Developing Roller

Transfer Roller

Heat Roller

Pressure Roller _1st

Pressure Roller _2st

Abnormal image period

75.5mm

26.7mm

47.1mm

35.2mm

47mm

77.6mm

62.8mm

37.7mm

Kind of abnormal image

White spot, Block Spots

Block Spot and Periodic Band

Periodic Band by little difference of density

White Spot, Horizontal black band

Ghost, Damaged Image by abnormal transfer

Black Spots or Vertical Black Band

Blackground

Blackground


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Samsung Electronics


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

STATUS

04

05

07

08

DEV 300

LSU READY

PAPER EMPTY

09

10

COVER OPEN

COER HEATING

DEV 350

LSU MT & LD

PAPER WIDTH

EXIT SENSOR

DEV 350

LSU MOTOR

NEW CRU

FEED SENSOR

PRINTING TEMP READY HEAT

SELF

TEST

DIAGNOSTIC

00

01

02

03

04

05

06

07

08

09

10

11

12

13

14

DIAGNOSTIC CODE

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

ON OFF

61

STATUS CODE

WARM UP

00

01

02

03

04

READY (REGAL)

READY (LETTER)

READY (A4)

READY (EXECUTIVE)

READY (B5)

20

30

40

50

PRINT START

FEED SENSOR ON

FEED SENSOR OFF

PAPER OUT

69

SLEEP MODE

ERROR STATUS CODE

60

62

68

64

70

71

72

73

95

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

DIAGNOSTIC

MODE

DOWN

UP

SHIFT STOP

ENTER

TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL

AND TURN THE PRINTER POWER ON.

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Samsung Electronics


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

20, 21, 22

30

40

50

69

Code

61

00~05

State

Warm up

Ready(kind of paper)

Print Start

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 Description

64

65

70

71

72

60, 62, 68

73

95

96

Fuser Error The error in the fuser occurred. There is a short circuit in the thermistor and the thermostat while printing, Low Temperature Error occurs.

• 60: Open Fuser Error

• 62: Low Heat Error

• 68: Over Heat Error

The Printer Cover is open.

The Toner Cartridge not installed,

Cover Open

CRU Error

No Paper

Paper Jam 0

Paper Jam 1

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.

Paper Jam 2 The front part of paper is jammed just after passing through the discharge sensor.

LSU Not Ready LSU Scanner Motor not ready.

LSU Not Ready Hsync signal not output.

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Samsung Electronics


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.

Description Code

00 Main Motor Operating System

Only the main motor is in operation.

01 Main High Voltage On(THV-)

-1400 voltage output by MHV terminal.

Caution : High voltage probe should be used.

02

03

04

05

06

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.


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.


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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Samsung Electronics


Code

07

08

09

10

11

12

13

14

15

16

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

Exit Sensor ON/OFF

2nd LED 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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Samsung Electronics


No.

00

01

02

03

Function

Mot or

MHV

THV(-)

THV(+)

Enter

Motor Run

Mhv On

Thv Negative On

Thv O n

Up/ Down Stop

Motor Stop

Mhv Off

Thv Negative Of f

Thv Off

Remark

1300V

-1000V

+1300V

Dev Of f

-350V

04

DEV

Dev On

Supply

0 : -550V

DEV

0 : -350V

05

LSU

LSU Run

O n Off Ready

06

PickUp

Pickup On

07

PEmpty

Paper Empty

08

14

15

16

Sensor

09

10

11

12

13

17

Exit

Cover

Cover Open

Fuser

Hot Burn

Clean Print

Thv

Reference

PTL

FAN

Manual

Pic kUp

Manual

Sensor

Fuser On

Hot Burn On

Clean Printing

PTL On

Fan O n

Manual Pickup On low adequate

Manual Sensor

Feed high

LSU Stop

Pickup Off

Fuser Off

020mV

PTL O ff

Fan Off

Manual Pickup O ff

PTL No

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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Samsung Electronics


4.1.6.5 Paper Path

FUSER

DUPLEX

CASSETTE

LSU

DEVE


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Samsung Electronics

4.1.7 Paper Jam

4.1.7.1 In the paper feed area

In the tray 1

1. Pull the tray 1 open.


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.

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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Samsung Electronics

In the optional tray 2

1. Pull the optional tray 2 open.

2. Remove the jammed paper from the printer.


In the manual tray

1. Remove the jammed paper from the printer.

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. Pull the tray 1 half.

4. Pull the paper straight up and out.

2. Open and close the front cover.

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

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


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Samsung Electronics


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

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.

4. Pull the guide rear on each side down and remove the paper.

Return the guide rear to its original position.

1

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

3. Open the rear cover.

1 guide rear

5. Close the rear cover. Printing automatically resumes.


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Samsung Electronics


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.

1

1 duplex unit

1

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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Samsung Electronics


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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Samsung Electronics


4.1.8 Download & Reset F/W

Firmware download metho d

Normal

Download method

LED Panel

Boot

Download method

LED Panel

Reset method

LED Panel

1.

In Do s Prom pt, type "Usblist2 [ Rom file name] " and Press

Enter

2.

Status LED Slow blink

3.

Status LED & Ton er Save LED are both blink

4.

When d ownload complet e, set will be automatically power

On/O ff and it' ll Warming Up

1.

While Pressing Stop k ey, Power O n t he Print er

2.

In Dos Prompt, type "Usblist2 [Rom file name]" and Press

Enter

3.

Status LED Slow bli nk

4.

Status LED & Ton er Save LED are both blink

5.

When d ownload complete, set will be automatically power

On/O ff and it' ll Warming Up

1.

In Dos Prompt, type "Usblist2 [Rom file name]" and Press

Enter

2.

Status LED Slow blink Fast bli nk then print out configuration page

3.

Check th e OS version and total pa ge value is "0"

4.

Please set power On/ Off


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Samsung Electronics


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?

END

Refer to "Solution of Image Problem"

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Samsung Electronics


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.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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.

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

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

Replace the transfer roller if occurred as No. 3.


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Samsung Electronics


2) Vertical White Line

Description: White vertical voids in the image.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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

Foreign matter stuck onto the window : Clean the LSU window with recommended cleaner(IPA)

Clean the window with a clean cotton swab.

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.

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

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

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

6. Partly depression or deformation on the surface of the

transfer roller

Replace the transfer roller if occured as NO.6

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Samsung Electronics


3) Horizontal Black Band

Description: Dark or blurry horizontal stripes occur in the printing periodically.

(They may not occur periodically.)

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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


4) Black/White Spot

Description: 1. Dark or blurry spots occur periodically in the printing

2. White spots occur periodically in the printing

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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

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.

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.

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Samsung Electronics


5) Light Image

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

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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

Check if the Toner Save mode is off.

Check if the density is light.

No 1 : Replace the toner cartridge

and try to print out.

2. Ambient temperature is below than 10°C.

No 2 : Wait 30 minutes after printer

is powered on before you

start printing.

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)

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


6) Dark Image or a Black Page

Description: The printed image is dark.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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.

Replace the LSU Unit or Main PBA.


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Samsung Electronics


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.

Replace both the left and right

Spring Holder.

2. The life of the Toner cartridge has expired.

Occur in the toner cartridge gently shake the toner cartridge.

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

Replace the toner cartridge and try to print out.


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Samsung Electronics


8) Background

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

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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 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.

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.

5. Is the HVPS normal?

1. If the problem is still not solved,

replace the toner cartridge.

2. Gently shake the toner

cartridge.

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Samsung Electronics


9) Ghost (1)

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


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..

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Samsung Electronics


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.

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


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Samsung Electronics


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)

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

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


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Samsung Electronics


11) Ghost (3) : Fuser

Description: Ghost occurs at 62.8 mm or 77.6mm intervals.

The temperature of the fuser is maintained high.

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)


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Samsung Electronics


12) Stains on the Face of Page

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

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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


13) Stains on Back of Page

Description: The back of the page is stained at 47 mm or 62.8mm intervals.

1. 47mm : Transfer roller is contaminated.

2. 62.8mm : Pressure roller is contaminated.

Perform the OPC Cleaning Mode

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

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.


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Samsung Electronics


14) Blank Page Print out (1)

Description: Blank page is printed.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Bad ground contacts in OPC and/or toner cartridge.

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.


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Samsung Electronics


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.

2. Abnormal solenoid.

Remove contamination of the terminals of the 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.


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Samsung Electronics


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.

Replace the defective actuator


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Samsung Electronics


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.


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Samsung Electronics


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.


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Samsung Electronics


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.

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.

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Samsung Electronics


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.

Replace a duplex roller.


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Samsung Electronics


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.

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


7) Paper rolled in the fuser

Description: If contaminated at intervals of 77.6mm on the back of a paper.

1. Contamination of the pressure roller or heat roller

(Background, Hot off set).

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

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

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.


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Samsung Electronics


8) Paper rolled on the OPC Drum

Description: Paper is rolled up in the OPC.

1. Paper is too much thin.

2. The face of paper is curled.

Recommend to use normal paper.

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.


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Samsung Electronics


4.2.4 The cause and solution of the malfunction

1) Fuser Error

Description: All LEDs blinking.

1. Check whether a thermostat,

AC wire, and heat lamp are open or not.

2. Check whether a thermistor is open or not.

3. Heat lamp ON/OFF test

Replace the fuser if a thermostat is open.

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

Check whether the overheat mode circuit operates normally or not.

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

Replace the fuser.


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Samsung Electronics


2) LSU Error

Description: "PMOTOR ERROR/HSYNC ERROR'

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

Replace a LSU

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

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

3. Check the HSYNC signal.


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Samsung Electronics


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. Check the Heat Lamp.

1. Replace the Fuser.

2. Replace the Main PBA.

3. Replace the SMPS.


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Samsung Electronics


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.


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Samsung Electronics


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

Replace the engine board.


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Samsung Electronics


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.

1. Check the insertion of the

Cover Open S/W Connect.

2. Replace the Main Control

board or Cover Open S/W.


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Samsung Electronics


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

1. Check the insertion of the

Cover Open S/W Connect.

2. Replace the Main Control

board or Cover Open S/W.


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Samsung Electronics


8) Defective motor operation

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

1. Contamination of the pressure roller or heat roller

(Background, Hot off set).

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

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

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.


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Samsung Electronics


9) No Power

Description: When system power is turned on, all lamps on the operator panel do not come on.

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

Replace the power supply cord or SMPS.

2. Check the inferiority of LED-Panel or L

CD window on the front-cover if the OP panel does not appear after normal warming-up.

1. Replace the control board.

2. Replace the OP panel.


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Samsung Electronics


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.

2. Chect the Deve PBA in the Toner Cartridge.

Replace LSU.

1. Replace theToner Joint PBA.

2. Replace the MainPBA.


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Samsung Electronics


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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Samsung Electronics


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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Samsung Electronics


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.

1. Run Self-Test Mode:

Turn the power on while pressing the test printing button for 2 or 3 seconds before printing works.

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

3. Printing is nor working in the Windows.

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

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).

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)

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

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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Samsung Electronics


2) The printer is not working (2)

Description: After receiving the printing order, no response at all or the low speed of printing occurs due to wrong setup of the environment rather than malfunction of the printer itself.

1. Secure more space of the hard disk.

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

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.

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.

4. Reboot the system to print.

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.


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Samsung Electronics


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.

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

2. Printer Driver Error.

Select SPP(Normal) or ECP LPT Port the among ECP, EPP or SPP 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)

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.)

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


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Samsung Electronics


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.

2. If the previous printing error not solved.

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.

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.

5. When some files related to

OS are damaged or virus infected.

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.


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.

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ExplodedView and Parts list

5. Exploded Views and Parts List

5.1 Main

5.2 Top Cover

5.3 Cover Ass'y

5.4 Front Cover

5.5 Rear Cover

5.6 Frame

5-2

5-4

5-6

5-8

5-10

5-12

5.7 Main Drive

5.8 Rear Guide

5.9 Fuser

5.10 Duplex Unit

5.11 Cassette

5.12 SCF

DIGITAL LASER PRINTER 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

5-17

5-19

5-21

5-23

5-25

5-27


5-1

Samsung Electronics

5.1 Main



5-2

Samsung Electronics


Main Parts List

SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE

5.1-16-1

5.1-16-2

5.1-16-3

5.1-16-4

5.1-17

5.1-18

5.1-19

5.1-19

5.1-20

5.1-9

5.1-10

5.1-11

5.1-12

5.1-13

5.1-14-1

5.1-14-2

5.1-15

Drawer# SEC_Code

5.1-0 ML-285

1ND SET

5.1-1 SHIELD-CONTROLLER

5.1-2

5.1-3

5.1-4

5.1-5

JC63-01572A

JC92-019

36A

JC44-00156A

JC44-0009

5A

JC39-00817A

PBA MAIN-CONTROLLER

Description QT'y

1

1

HVPS 1

SMPS-PSP_TYPE2_V1 1

CBF HARNESS-FUSER AC(SMPS) 1

Service Remark

S

NA

SA

SA

SA

SA

5.1-6

5.1-7

5.1-8

JC39-00828A

JC39-00824A

JC96-04731A

CABLE FORM CONN COAX

CBF HARNESS-HVPS

ELA UNIT-RX DRIVE

1

1

1

SA

SA

SA

JC39-00820A

JC39-00816A

JC66-01218A

JC96-04733A

JC96-04736A

JC63-01650A

JC63-01651A

JC97-03012A

JC97-03013A

JC97-03014

A

JC97-03015A

JC97-03016A

JC97-03017A

JC96-04735A

3903-000085

3903-000042

JC96-04823B

CBF HARNESS-MOTOR & SOLENOID

CBF HARNESS-AC-INLET

ROLLER-TRANSFER

ELA UNIT-LSU

MEA UNIT-DUPLEX

COVER-DUPLEX

COVER-REAR DUPLEX

MEA-COVER TOP

MEA UNIT-COVER_LEFT

MEA UNIT-COVER_RIGHT

MEA UNIT-COVER_REAR

MEA UNIT-COVER FRONT

MEA UNIT-CASSETTE

ELA UNIT-SCF

CBF-POWER CORD(110V)

CBF-POWER CORD(220V)

ELA HOU-DEVE 1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

SA

SNA

SA

SA

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA


5-3

Samsung Electronics

5.2 Top Cover



5-4

Samsung Electronics


Top Cover Parts List


5.2-0 JC97-03012

A

5.2-1 JC63-01523A

5.2-2

5.2-3

5.2-5

JC61-02230A

JC72-01343A

JC63-01528A

5.2-7

5.2-8

5.2-9

5.2-10

JC67-00274A

6107-001169

JC64-00359A

6003-000196

MEA UNIT-COVER_TOP

COVER-TOP

STACKER-RX

PMO-SUB_M_STACKER

COVER-DUMMY KEY

LENS-LED

SPRING-CS

KEY-ON_LINE

SCREW-TAPTITE

Description


QT'y Service Remark

1 SA

1

1

1

1

2

1

1

1

SNA

SA

SA

SNA

SA

SA

SA

SNA


5-5

Samsung Electronics

5.3 Cover Ass'y



5-6

Samsung Electronics


Cover Ass'y Parts List


5.3-0 JC96-04741

A

5.3-1 JC97-03016A

5.3-2

5.3-3

5.3-3-1

JC97-03013A

JC97-03014

A

JC63-01525A

5.3-3-2

5.3-4

JC63-01570A

JC97-03015A

ELA HOU-COVER

MEA UNIT-COVER_FRONT

MEA UNIT-COVER_LEFT

MEA UNIT-COVER_RIGHT

COVER-RIGHT

COVER-RIGHT_DIMM

MEA UNIT-COVER_REAR

Description



1 SA

1

1

1

1

1

1

SA

SA

SA

SNA

SNA

SA


5-7

Samsung Electronics

5.4 Front Cover



5-8

Samsung Electronics


Front Cover Parts List


5.4-0

5.4-1

JC97-03016A

JC63-01527A

5.4-2

5.4-3

5.4-4

5.4-5

JB64-00007A

JC63-01569A

JC61-02267A

6003-000282

MEA UNIT-COVER_FRONT

COVER-FRONT

LOCKER-LATCH PUSH

COVER-MANUAL

BRACKET-MANUAL

SCREW-TAPTITE

Description



1

1

SA

SA

1

1

1

1

SA

SNA

SNA

SNA


5-9

Samsung Electronics

5.5 Rear Cover



5-10

Samsung Electronics


Rear Cover Parts List


5.5-0 JC97-03015A

5.5-1

5.5-2

JC63-01526A

JC61-02399A

MEA UNIT-COVER_REAR

COVER-REAR

GUIDE-CHANGE_DUP

Description



1 SA

1

1

SNA

SNA


5-11

Samsung Electronics

5.6 Frame1



5-12

Samsung Electronics

Frame2



5-13

Samsung Electronics


Frame Parts List


5.6-0 JC96-0473

7A

5.6-1 JC61-02187A

5.6-2

5.6-3

5.6-4

JC63-01616A

JC92-01488A

JC72-00983A

5.6-30

5.6-31

5.6-32

5.6-33

5.6-34

5.6-35

5.6-25

5.6-26

5.6-26-1

5.6-26-2

5.6-26-3

5.6-27

5.6-28

5.6-29

5.6-20

5.6-21

5.6-21-1

5.6-21-2

5.6-21-3

5.6-22

5.6-23

5.6-24

5.6-12

5.6-13

5.6-14

5.6-15

5.6-16

5.6-17

5.6-18

5.6-19

5.6-5

5.6-6-1

5.6-6-2

5.6-7

5.6-8

5.6-9

5.6-10

5.6-11

JC66-01656A

JC97-03141A

JC72-00979A

6107-001167

JC72-00980A

JC66-01889A

JC72-00982A

JC66-01692A

JC61-00915A

JC97-03062A

JC73-00265A

JC61-00910A

JC61-00909A

JC61-00587A

JC66-01660A

JC66-01634A

JC31-00085A

JC70-40912A

JC61-00031A

JC63-01619A

JC63-01618A

JC63-01620A

JC63-01613A

JC63-01621A

JC61-02233A

JC96-04732A

JC66-01651A

JC61-02220A

JC61-02225A

JC66-01655A

JC66-01865A

JC72-00382B

JC63-01614A

6107-001352

JC66-00377A

6044-000001

JC66-40964A

JC66-01627A

Description

ELA HOU-FRAME_

110V

FRAME-BASE

GROUND-ZENOR

PBA MAIN-ZENER

PMO-LOCKER CST

FAN-DC

ICT SHAFT HV LARGE

SPRING ETC-HV LARGE

GROUND-MOTOR_MAIN

GROUND-CONTROLLER

GROUND-PAPER

GROUND-BRKT FRONT

GROUND-TRANSFER

HOLDER-REGI

MEA UNIT SWING

GEAR RDCN 23/23

COLLAR SWING

BRKT SWING

SHAFT-FEED REGI

CLUTCH ELECTRIC

PMO-BUSHING FEED

ROLLER-FEED REGI

MEA UNIT-GEAR PICK UP

GEAR PICK UP A

SPRING-CS

GEAR PICKUP B

CAM-PICK UP

PMO-IDLE PICK_UP

SHAFT-P-PICK_UP

STOPPER-M-PICK UP_R2

MEA UNIT-PICK UP

RUBBER PICK_UP

HOUSING-M-PICK UP2_R2

HOUSING-M-PICK UP_R2

BUSH-M-PICK_UP R

SHAFT-FEED

GEAR-FEED DR 16

GROUND-GUIDE TR

SPRING-TS

CAM-M-PICK_UP

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

GEAR-EXIT,IDLE(Z17)

GEAR-FEED RDCN 24/19



1 SA

1

1

2

1

2

1

1

1

1

1

1

1

1

5

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

4

1

1

4

1

4

1

1

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

5-14


Samsung Electronics




5.6-36 JC61-02226A

5.6-63

5.6-64

5.6-65

5.6-66

5.6-67

5.6-68

5.6-69

5.6-71

5.6-54-1

5.6-54-2

5.6-54-3

5.6-54-4

5.6-55

5.6-56

5.6-57

5.6-59

5.6-72

5.6-73

5.6-74

5.6-75

5.6-76

5.6-77

5.6-78

5.6-79

5.6-80

5.6-81

5.6-45

5.6-46

5.6-47

5.6-48

5.6-49

5.6-50

5.6-52

5.6-53

5.6-37

5.6-38

5.6-39

5.6-40

5.6-41

5.6-42

5.6-43

5.6-44

JC61-01172A

JC66-00824A

JC66-00830A

6107-001163

JC66-40209A

JC72-41191B

JC61-02308A

JC66-01662A

JC63-01572A

JC63-01573A

JC62-00461A

JC61-40001A

JC70-00546A

JC70-00547A

JC70-00304A

JC66-00387A

JC33-00026A

6003-000301

JC31-00085A

JC61-02232A

JC63-01571A

JC61-02238A

JC63-01615A

JC92-01439A

JC61-02312A

JC61-02311A

JC61-02310A

JC66-00875A

6044-001005

JC39-00826A

JC65-00019A

JC92-01829A

JC66-01647A

JC66-01646A

6107-001164

0604-001095

JC39-00824A

JC61-02309A

JC66-01022A

JC66-01846A

JC61-02303A

JC63-01743A


BRACKET-FEED

SOLENOID PCIKUP

SCREW-TAPTITE

FAN-DC

HOLDER-POWER

Description QT'y Service Remark

1

SHIELD-POWER_SWITCH

PLATE-POWER CAP

GROUND-SCF

PBA LED-PANEL

FRAME-LSU-HOLDER-R

FRAME-LSU-HOLDER_L

FRAME-EXIT_HIGH

GEAR-M-FUSER IDLE 1

RING-CS 1

CBF HARNESS-LSU SW&FAN 1

TERMINAL-CRUM

PBA SUB-TERMINAL

4

1

1

1

1

1

1

1

1

1

2

1

1

1

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

HOLDER-M-EXIT F/DOWN

ROLLER-EXIT MAIN

ROLLER-EXIT FR

SPRING CS

GEAR-M-EXIT

PMO-BEARING SHAFT

SUPPORT-ROLLER 1

ROLLER-EXIT F/DOWN 1

1

2

2

2

2

2

SHIELD-CONTROLLER

SHIELD-SMPS

INSULATION-SMPS 1

FOOT-ML80 2

1

1

ADJUST-MANUAL L

ADJUST-MANUAL R

ADJUST RACK-M-MANUAL

GEAR-RACK_PINION

2

1

1

1

ACTUATOR-FEED

ACTUATOR-DUPLEX

SPRING-TS

PHOTO INTERRRUPTER

CBF HARNESS-HVPS

FRAME-DUPLEX_PATH

ROLLER-M-IDLE SCF

SHAFT-DUP_ROLLER

GUIDE-FRAME_DUPLEX

SHEET-GUIDE_DUP_PATH

1

1

1

1

1

2

3

1

1

1

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SNA

SNA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

5-15


Samsung Electronics




5.6-82 JC72-00382B

5.6-107

5.6-108

5.6-109

5.6-110

5.6-111

5.6-112

5.6-114

5.6-115

5.6-99

5.6-100

5.6-101

5.6-102

5.6-103

5.6-104

5.6-105

5.6-106

5.6-91

5.6-92

5.6-93

5.6-94

5.6-95

5.6-96

5.6-97

5.6-98

5.6-83

5.6-84

5.6-85

5.6-86

5.6-87

5.6-88

5.6-89

5.6-90

JC61-70958A

JC61-00914A

JC72-00984A

JC61-70932A

JC72-00985A

6107-001370

JC61-02468A

JC65-00033A

JC61-00588A

JC61-02304A

JC61-00553A

JC61-02231A

JC66-01649A

6107-001172

JC97-03067A

JC61-00424A

JC66-00598A

JC66-01648A

JC63-01617A

JC63-00527A

JC75-00095A

JC61-02268A

JC63-01676A

JC61-02306A

JC61-02400A

JC61-02305A

JC61-00604B

JC61-02307A

JC61-02196A

JC61-02236A

JC66-01654A

JC61-00585A

Description

PMO-BUSHING FEED

ROLLER-FEED

ACTUATOR-EMPTY

GROUND-PICK_UP

SHEET-BRUSH

MEC-BRUSH PICK UP

BRACKET-COVER FRONT

GROUND-BRUSH PICK UP

GUIDE-PAPER

GUIDE FRONT PAPER

GUIDE-TR_RIB

PLATE-E_SAW

GUIDE-TR

GUIDE-INPUT

PLATE EARTH TRANSFER

SHAFT-FEED IDLE

BUSH-M-FEED IDLE

SPRING ETC-TR

PLATE-P-PUSH BUSHING

PMO-PLATE GUIDE DEVE_L

SPRING ETC-GUIDE DEVE

PMO-PLATE GUIDE DEVE_R

SPRING TR

BUSH-TR_L

TERMINAL SPRING TR

PMO-BUSHING_TR(L)

GUIDE-HOLDER_TR

SPRING ETC-ES (Guide holder TR)

HOLDER-TRANSFER

LINK-COVER_REAR

SPRING-CS

MEA UNIT-GUIDE REAR

BUSH-4



5 SA

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

2

1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA


5-16

Samsung Electronics

5.7 Main Drive



5-17

Samsung Electronics


Main Drive Parts List


5.7-0 JC96-04731A

5.7-9

5.7-10

5.7-11

5.7-12

5.7-13

5.7-14

5.7-15

5.7-18

5.7-19

5.7-20

5.7-1

5.7-2

5.7-3

5.7-4

5.7-5

5.7-6

5.7-7

5.7-8

JC61-02195A

JC66-01641A

JC66-01628A

JC66-01632A

JC66-01626A

JC66-01633A

JC66-01625A

JC66-01640A

JC66-01650A

JC66-01798A

JC66-01637A

6031-000023

JC61-02227A

JC31-00090A

6003-000269

6044-001130

JC70-00548A

6107-001372

ELA UNIT-DRIVE

BRACKET-GEAR

GEAR-EXIT RDCN 61/28

GEAR-RDCN 83/40

GEAR-FUSER DR IN 61

GEAR-RDCN 89/55

GEAR-OPC DR IN 89

GEAR-FEED RDCN 56/25

GEAR-PICKUP IDLE 31

GEAR-RDCN 52/18

GEAR-OPC CLUTCH 29

GEAR-FUSER DR OUT 37

WASHER-PLAIN

BRACKET-MOTOR

MOTOR BLDC

SCREW-TAPTITE

RING-C

HUB-CLUTCH

SPRING CLUTCH

Description



1 SA

11

1

1

1

1

1

1

5

1

1

1

1

1

1

1

1

1

1

SA

SA

SA

SNA

SNA

SNA

SA

SNA

SNA

SNA

SA

SA

SA

SA

SNA

SA

SA

SA


5-18

Samsung Electronics

5.8 Rear Guide



5-19

Samsung Electronics


Rear Guide Parts List


5.8-0 JC97-03067A

5.8-1

5.8-2

5.8-3

5.8-4

5.8-5

5.8-6

JC61-02198A

JC66-01661A

JC61-02158A

JC66-01584A

JC66-01583A

JC73-00259A

MEA UNIT-GUIDE REAR

GUIDE-REAR

ROLLER-IDLE_EXIT

BUSH-TX

SHAFT-EXIT_F/UP

GEAR-EXIT

RUBBER-EXIT_F/UP

Description



1 SA

3

1

1

4

1

2

SNA

SNA

SNA

SNA

SA

SNA


5-20

Samsung Electronics

5.9 Fuser



5-21

Samsung Electronics


Fuser Parts List

5.9-29

5.9-30

5.9-31

5.9-32

5.9-33

5.9-34

5.9-35

5.9-36

5.9-37

5.9-21

5.9-22

5.9-23

5.9-24

5.9-25

5.9-26

5.9-27

5.9-28

5.9-13

5.9-14

5.9-15

5.9-16

5.9-17

5.9-18

5.9-19

5.9-20

5.9-5

5.9-6

5.9-7

5.9-8

5.9-9

5.9-10

5.9-11

5.9-12


5.9-0 JC96-0471

8A

5.9-1 JC63-01517A

5.9-2

5.9-3

5.9-4

JC72-40981A

JC66-01312A

JC70-20901A

JC66-01663A

JC61-02336A

JC66-01664A

JC61-02337A

JC66-01598A

JC66-01597A

6107-001246

6044-000159

6107-001361

4713-00121

1

JC67-00266A

JC67-00267A

JC66-01638A

JC66-00056A

6031-001051

6044-000001

0604-001095

1404-001438

6003-000196

4712-001031

6003-000282

JC63-01536A

JC66-01256B

JC66-01254A

JC61-02334A

JC61-02335A

JC72-20902A

6107-001359

JC61-02154A

JC61-01950A

6107-001165

JC66-01595A

JC61-02197A

ELA UNIT-FUSER

COVER-FUSER

PMO-ROLLER UPPER DP

ROLLER-IDLE

IEX-SHAFT IDLE,F/UP

THERMISTOR-NTC ASSY

SCREW-TAPTITE

THERMOSTAT

SCREW-TAPTITE

GROUND-FUSER

ROLLER-HEAT

GEAR-FUSER

BUSH-HR-L

BUSH-HR-R

PEX-ROLLER F/UP(2)

SPRING-ETC

GUIDE-CLAW

SPRING ETC-CLAW

SPRING-TS

ACTUATOR-EXIT

FRAME-FUSER

ROLLER-PRESSURE

BUSH-PR-1ST

ROLLER-PRESSURE_2ND

BUSH-PR-2ND

LEVER-LINK JAM_R

LEVER-LINK JAM_L

SPRING-CS

RING-C

SPRING-ES

LAMP-HALOGEN

CAP-LAMP_L

CAP-LAMP_R

GEAR-FUSER RDCN 28-20

GEAR-MPF 5

WASHER-PLAIN

RING-CS

PHOTO-INTERRUPTER

Description



1 SA

1

1

2

1

2

2

1

1

1

2

1

2

1

1

4

1

2

2

1

1

1

4

4

1

2

1

1

1

1

1

4

1

1

5

3

1

3

SNA

SNA

SNA

SA

SA

SA

SNA

SNA

SA

SA

SNA

SNA

SNA

SNA

SNA

SNA

SA

SNA

SNA

SNA

SA

SNA

SNA

SA

SNA

SNA

SA

SA

SNA

SNA

SA

SA

SA

SA

SNA

SA

SNA

5-22


Samsung Electronics

5.10 Duplex Unit



17

18

16

19

17

18

16

0

15

20

13

14

2

3

1

12-1

12-2

12

4

12-1

12-2

12

4

5

6

5-23

7

10

8

9

11

Samsung Electronics



5.10-0 JC96-04736A

5.10-1

5.10-2

5.10-3

5.10-4

5.10-5

5.10-6

5.10-7

5.10-8

JC61-02188A

JC65-00036A

JC65-00035A

JC61-00665A

JC66-01657A

6044-000107

JC66-00900A

JC66-00899A

5.10-9

5.10-10

5.10-11

5.10-12

JC66-00038A

6602-001589

6602-001588

JC96-03662A

5.10-12-1 JC66-00901A

5.10-12-2 6044-000107

5.10-13

5.10-14

JC61-02235A

6003-000440

5.10-15

5.10-16

5.10-17

5.10-18

5.10-19

5.10-20

JC61-02314A

JC66-00896A

JK72-00058A

JC66-00444A

6107-001156

6003-000196

Duplex Unit Parts List

ELA UNIT-DUPLEX

FRAME-DUPLEX_BASE

TERMINAL-GND_DUP L

TERMINAL-GND_DUP S

BUSH-M-FEED, DUP

ROLLER-FEED_DUP2

RING-C

PULLEY-M-18-DUMMY_DUP

PULLEY-18_DUP

GEAR-EXIT F/DOWN

BELT-TIMING GEAR

BELT-TIMING GEAR

ELA UNIT-ROLLER_DUP

ROLLER-FEED_DUP

RING-C

BRACKET-DUPLEX_ALIGN

SCREW-TAPPING

GUIDE-DUPLEX_UPPER

ROLLER-M-IDLE_ DUP

PCT-SILP WASHER

SHAFT-IDLE ROLL, DUP

SPRING-TS

SCREW-TAPTITE

Description



1 SA

1

1

1

1

1

2

1

1

6

3

1

1

1

6

1

1

4

2

1

2

2

3

SA

SA

SA

SNA

SA

SNA

SNA

SNA

SNA

SA

SA

SA

SNA

SNA

SA

SA

SNA

SA

SNA

SA

SA

SNA


5-24

Samsung Electronics

5.11 Cassette



5-25

Samsung Electronics



5.11-0 JC97-03017A

5.11-9

5.11-10

5.11-11

5.11-12

5.11-13

5.11-14

5.11-15

5.11-16

5.11-1

5.11-2

5.11-3

5.11-4

5.11-5

5.11-6

5.11-7

5.11-8

5.11-17

5.11-18

5.11-19

5.11-20

5.11-21

5.11-22

JC61-00876A

JC61-00918B

JC72-00971A

JC70-00301A

JC70-00300A

JG66-40003A

6003-000264

JC61-00603A

JC66-00719A

6003-000261

6107-001166

JC72-00972A

JG61-70531A

JC96-04743A

JC61-01978A

JC63-01531A

6107-001047

JC66-00529A

6003-000196

JC64-00353A

JC63-01670A

JC63-01671A

Cassette Parts List

MEA UNIT-CASSETTE

FRAME-M_CASSETTE

GUIDE-M-EXTENSION L2

PMO-EXTENSION SMALL

ADJUST-M-CASSETTE_R

ADJUST-M-CASSETTE_L

GEAR-PINION

SCREW-TAPTITE

PLATE-P-KNOCK_UP

CAM-M-KNOCK UP

SCREW-TAPTITE

SPRING-CS

PMO-PLATE_LOCKER

SPRING ETC-LOCKER,PLATE

ELA HOU-HOLDER_PAD

HOUSING-HOLDER PAD

COVER-HANDLE_CASSETTE

SPRING-ES

ROLLER-M-IDLE FEED

SCREW-TAPTITE

INDICATOR-PAPER

SHEET-GUIDE_SIDE_FAR

SHEET-GUIDE_SIDE_NEAR

Description



1 SA

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

2

1

2

2

2

1

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA


5-26

Samsung Electronics

5.12 SCF



5-27

Samsung Electronics


SCF Parts List


5.12-0 JC96-04735A

5.12-9

5.12-9-1

5.12-9-2

5.12-9-3

5.12-9-4

5.12-9-5

5.12-9-6

5.12-9-7

5.12-1

5.12-2

5.12-3

5.12-4

5.12-5

5.12-6

5.12-7

5.12-8

5.12-9-8

5.12-9-9

JC61-02229A

JC31-00011E

5.12-9-10 JC72-00825A

5.12-9-11 6003-000269

5.12-9-12 6031-000023

5.12-10 JC97-03062A

5.12-10-1 JC61-00909A

5.12-10-2 JC73-00265A

5.12-10-3 JC61-00910A

5.12-11 JC96-04771A

5.12-11-1 JC61-02189A

5.12-11-2 JC63-00369A

5.12-11-3 JC70-11028A

5.12-11-4 6003-000196

5.12-11-5 JC72-00983A

5.12-11-6 JC72-00975A

JC97-03017A

JC63-01607A

JC63-01530A

JC63-01529A

JC63-01608A

JC63-01650A

JC63-01651A

6003-000196

JC96-04772A

JC61-02228A

JC61-02234A

JC66-01785A

JC66-00688A

JC66-00396A

JC66-00690A

JC66-01784A

5.12-11-7 JC63-00527A

5.12-11-8 JC75-00095A

5.12-11-9 JC61-40001A

5.12-11-10 JC61-00836A

5.12-11-11 JC63-01609A

5.12-11-12 JC63-00492A

5.12-11-13 JC92-01911A

5.12-11-14 JC63-01636A

5.12-11-15 JC63-01635A

5.12-11-16 JC33-00026A

ELA UNIT-SCF

MEA UNIT-CASSETTE

COVER-FRONT_SCF

COVER-RIGHT_SCF

COVER-LEFT_SCF

COVER-REAR_SCF

COVER-DUPLEX

COVER-REAR DUPLEX

SCREW-TAPTITE

ELA HOU-MOTOR_SCF

BRACKET-MOTOR_SCF

SUPPORT-FEED_SCF

GEAR-IDLE 59

GEAR-61/47 IDLE

GEAR-IDLE 23

GEAR-35 IDLE

GEAR-RDCN 57/18

BRACKET-GEAR_SCF

MOTOR STEP

PMO-IMPELLER_DRV

SCREW-TAPTITE

WASHER-PLAIN

MEA UNIT-PICK UP

HOUSING-M-PICK UP_R2

RUBBER-PICK_UP

HOUSING-M-PICK UP2_R2

ELA HOU-FRAME_SCF

FRAME-SCF

SHEET-COVER SENSOR

IPR-GROUND TOP

SCREW-TAPTITE

PMO-LOCKER CST

PMO-ACTUATOR EMPTY

SHEET-BRUSH

MEC-BRUSH ANTISTATIC

FOOT-ML80

FOOT-FRONT

COVER-HARNESS_SCF

COVER-M-SIMM R2

PBA-SCF

GROUND-PAPER_SCF

GROUND-BRUSH_SCF

SOLENOID-PICK UP

Description



1 SNA

1

11

2

1

1

1

1

1

1

1

3

1

1

5

1

1

1

1

1

1

1

1

0.5

2

2

1

1

1

1

1

1

1

1

1

1

6

1

1

1

1

1

1

SA

SNA

SNA

SA

SA

SNA

SA

SA

SNA

SA

SA

SA

SNA

SNA

SA

SA

SNA

SA

SA

SNA

SNA

SA

SA

SA

SA

SA

SA

SNA

SNA

SA

SNA

SA

SNA

SA

SNA

SNA

SNA

SNA

SNA

SNA

SNA

SNA

5-28


Samsung Electronics


SCF Parts List


5.12-11-17 JC61-00587A

5.12-11-18 JC61-00915A

5.12-11-19 JC72-00982A

5.12-11-27 JC66-00394A

5.12-11-29 JC72-00980A

5.12-11-31 6107-001170

5.12-21 JC61-00586A

5.12-22

5.12-23

JC66-01653A

JC66-00598A

5.12-24 JC72-00382B

BUSH-M-PICK_UP R

STOPPER-M-PICK UP_R2

PMO-IDLE PICK_UP

GEAR-FEED 2

PMO-GEAR PICK_UP B

SPRING-TS

BUSH-M-PICK_UP L

SHAFT-FEED_SCF

ROLLER-FEED

PMO-BUSHING FEED

Description



1 SA

1

1

1

1

1

1

2

2

2

SA

SA

SNA

SA

SA

SA

SA

SA

SA


5-29

Samsung Electronics

System Diagram


6-1

Samsung Electronics

System Diagram

6.2 Connection Diagram

OPE

KEY LED1 LED2

3

2

4

1

8

7

9

6

5

11

10

13

12

14

24V

24V

D

D

GN

GN

24VS

24VS

5V

HV

_D

_T

V_E

MH

EA

MH

M_

_R

M_

EV

GN

GN

V

D

N

V

C

D

D

_D nTH

PWM

PW

THV

PW

PWM

15

14

16

8

7

9

10

11

4

3

2

1

6

5

12

13

GN

GN

GN

24V

D GN

24V

D GN

24V

D GN

24V

D GN

ON R _

24VS

D

5V

5V

5V

D

D

SE FU

3

4

5

1

2

8

9

6

7

10

3

4

1

2

5

11

10

12

9

8

7

6

14

13

15

4

3

5

2

1

1

N

D GN

ER

N C1

GN

_S min

GN

_pl

D

D

H1 us us

_5V

LD_E

OW

HSY

LSU

O1

1_

LSU

VD

VDO

LD_P

D

_EN

GN

24VS

LK _C

U_RDY

OT

OT

LS

P_M

P_M

L NE P A

CN18

DCU

7 CN 1

_IF RK WO NET 9 C N

N S/W LSU

CN3 CRUM

CN8

MA N_

CN12

F A

B _ U S

CN11

_ IF SCF CN14

S SEN ED_

GND

3.3V

FE

8

7

9

NS SE

GND

3.3V

REG

5

4

6

NS SE

GND

3.3V

DUX_

2

1

3

K EA BR

Y

T

AD

MO

DIR

EN

RE

M_

T_

T_

T_

T_

MO

MO

PW

MO

NC

GND

MO

GND

24VS

24VS 9

8

7

6

10

4

3

5

2

1

T CL REG

24VS

T CL P_ KU PIC

24VS

12

11

14

13

EX

R2

R1

R_ PE

V

GND

3.3

PA

THE

THE

4

3

5

2

1

1

2

3

1

2

3

1

2

3

1

2

3

8

9

6

7

10

3

4

1

2

5


6-2

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)

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

• Cotton Swab

Standard : For general home use, for medical service.

• 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.

7-1


Samsung Electronics


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

HV

HVPS

I/F

I/O

IC

IDE

EPP

FPOT

F/W

GDI

GND

HBP

HDD

H/H

DPI

DRAM

DVM

ECP

EDC

EEPROM

EMI

EP

CN

CON

CPU dB dBA dBM

DC

DCU

AP

AC

APC

ASIC

ASSY

BIOS

BLDC

CMOS

Explanation

Access Point

Alternating Current

Auto Power Control

Application Specific Integrated Circuit assembly

Basic Input Output System

Brush-less Direct Current

Complementary Metal Oxide Semiconductor connector connector

Central Processing Unit decibel decibel A decibel milliwatt direct current

Diagnostic Control Unit

Dot Per Inch

Dynamic Random Access Memory

Digital Voltmeter

Enhanced Capability Port

Embedded Diagnostic control

Electronically Erasable Programmable Read Only Memory

Electro Magnetic Interference electrophotographic

Enhanced Parallel Port

First Printout Time firmware graphics device interface ground

Host Based Printing

Hard Disk Drive

High temperature and high marshy place high voltage

High Voltage Power Supply interface

Input and Output integrated circuit

Intelligent Drive electronics or Imbedded Drive Electronics

7-2


Samsung Electronics


Acronyms and Abbreviations(2)

Abbreviations

PTL

PWM

Q-PID

Q ty

RAM

ROM

SCF

SMPS

OPC

OP

PBA

PCL

PDL

PPM

PPS

PS

SPGP

SPL

Spool

SW sync

USB

WECA

L/L

LSU

MB

MHz

MPF

NIC

N/N

NVRAM

IEEE

IPA

IPM

LAN lb

LBP

LCD

LED

Explanation

Institute of Electrical and Electronics Engineers. Inc

Isopropy Alcohol

Images Per Minute local area network pound(s)

Laser Beam Printer

Liquid Crystal Display

Light Emitting Diode

Low temperature and low marshy place

Laser Scanning Unit megabyte megahertz

Multi Purpose Feeder

Network Interface Card

Normal temperature and normal marshy place nonvolatile random access memory

Organic Photo Conductor

Operation Panel Equipment

Printed Board Assembly

Printer Command Language , Printer Control Language

Page Discription Language

Page Per Minute

Pulse Per Second

Post Script

Pre-Transfer Lamp

Pulse Width Modulation

Quick Printer Initiating Device quantity

Random Access Memory

Read Only Memory

Second Cassette Feeder

Switching Mode Power Supply

Samsung Printer Graphic Processor

Samsung Printer Language

Simultaneous Peripheral Operation Online switch synchronous or synchronization

Universal Serial Bus

Wireless Ethernet Compatibility Alliance

7-3


Samsung Electronics


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


7-4

Samsung Electronics


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.


7-5

Samsung Electronics


7.5 LAN (Network Model)

• This product can be used with a wired LAN (Option)

• LED Condition and Status

RJ-45 Jack

Link LED(Green)

Active LED(Orange)

[LED STATUS]

LED Condition Status

Active LED random blink

Active LED regular blink

Normal NPC &Normal packet receive

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

7.6 Information of model's code

No.

1

2

3

4

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

Remark

Basic model

Option model

Basic model

High yield


7-6

Samsung Electronics


7.7 Parts Life Cycle Maintenance Table

7.7.1 Parts Life Cycle Maintenance Table

Supplies Life-Cycle Condition

Toner

Cartridge

Fuser

2K : For Product

5K :For Sale

50K(page):

Simplex

Toner Low

Toner Empty

Toner uninstalled

Exhauseted

Engine-Codition LCD- Indication

Warning

Warning

None LCD

None LCD

Custmoer -

Panel Manage

-

-

Responding

10% Remains

Initialized at toner change

No Indication None LCD Replaced at

Exhauseted

Transer

Roller

PickUP

Roller

50K(page):

Simplex

50K(page):

Simplex

Exhauseted

Exhauseted

No Indication

No Indication

None LCD

None LCD

Replaced at

Exhauseted

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

White, Black Point

Image contamination

(Toner leakage)

Image Fainted

Vertical Black Line

Criterion

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

- If continuous, failure

Drity printing image or conteminated reverse side

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

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

Vertical thin line emerge, if cartridge is scratched.

- (Customer fault)

Remarks

7-7


Samsung Electronics


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 Model abbriviation Feature/Properties

DIGIT

Example

Definition

Code

Description

1

M

2

L

3

Product Classification Color

Product

Classification

4

-

Division between code

Printer

Class of

Product

Description

: C

Laser

Beginning letter of printer

Description:

L

• Default=

Omissoin

• Only color printer "C" initial

• Engine=E

5

2

6

8

7

5

8

1

9

N

1. Speed of Engine 1. New model,series model division

- If same speed models are released simultaneously higher model is added +1 at speed code.

- If over 10 models with same speed are brought into, tenth model is added +1.

- Over 3rd grade project

2. Valuablet model division in market despite of not over 3rd grade

2. Domestic Entry Model

Distribution

- C&C : Engine speed

- Information : The first number deleted

- VE model, etc.(Valuable model is decided byproduct planning group with sales prospect)

1. Basic : 0

2. Series model division

- Below 4th grade project

• PC Bundle

• Domestic distribution

(Entry model excepted)

Main feature description

- N : N/W

- P : PS

- S : N/W+PS

- B : Bluetooth

- T : 2nd CST

- M : Mac Compatible

- X : Scanner

• Beside abovefeature description,product conception to product planning group responsed

10

D

Space

(Basic:

Omitted)

Description Alphabet Digit Alphabet


7-8

Samsung Electronics


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, : Letter(Alphabet))

- Type 1

- Type 2

-

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

A/S Only Material

A/S Only Material

A/S Only Material

A/S Only Material

A/S Only Material

Material Code

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

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

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

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

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

Material Name

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

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

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

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

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


7-9

Samsung Electronics

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 : 28

51-D0XAZ

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