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DIGITAL LASER MFP

SCX-4725FN Series

SCX-4725F

N/XAZ

Basic Model : SCX-4725FN

SERVICE Manual

DIGITA L LASER MFP The keynote of Product

- Machine Life: 50,000Pages

- Cpu: Chorus M

- Device Memory: 32MB

- Resolution: 1200x1200dpi

- Option: N/A

- Printing Speed: 24ppm(A4, LTR)

- Print Language: PCL

- Path Type: C-Path

- Cassette Capa.: 250sheets

- Outlet Stacking Capa.: 100sheets

- Toner Cartridge: initial(1.5K), sales(3K)

- ADF Capacity: 30sheets

- Scan Method: 600 dpi Color CIS

- Copy Speed: SDMC: 22Cpm/Ltr,

MDMC: 7Cpm/Ltr

- Interface: USB2.0

SCX-4725FN Series

Contents

1. Precautions

1.1 Safety Warning

1.2 Caution for safety

1.3 ESD Precautions

1.4 Super Capacitor or Lithium Battery Precautions

1-1

1-2

1-5

1-5

2.1 Product Overview

2.2 Specifications

2.3 Model Comparison Table

3. System Overview

3.1 System Layout

3.2 Engine H/W Specification

3.3 Deverope Process

3.4 Sanner Part

3.5 OPE(Operational Panel Equipment)

3.6 SMPS & HVPS

3.7 FUSER AC POWER CONTROL

4. Alignment and Adjustments

4.1 User Mode

4.2 Tech Mode and Setting

4.3 Control Panel

4.4 LCD Status Error Massages

4.5 Engine Test Mode

4.6 Paper Path and Clearing Paper Jams

2-1

2-2

2-8

4-1

4-4

4-13

4-15

4-17

4-19

3-1

3-5

3-12

3-13

3-15

3-16

3-18

Continued

5. Disassembly and Reassembly

5.1 General Precautions on Disassembly

5.2 MP Tray

5.3 Pick Up Roller

5.4 Front Cover

5.5 Cassette Tray

5.6 Rear Cover

5.7 Right Cover

5.8 Left Cover

5.9 Scan Ass'y

5.10 ADF Housing

5.11 OPE Unit

5.12 Platen Housing

5.13 Middle Cover

5.14 HVPS

5.15 Main PBA

5.16 RX Drive

5.17 Fuser Unit

5.18 Engine Shield (With LIU PBA, SMPS)

5.19 LSU

5.20 Paper Path Frame

5.21 CRUM Harness

6. Troubleshooting

6.1 Checking Symptoms

6.2 Bad discharge

6.3 Set Malfunction – Causes and Solutions

6.4 Bad Software Environment

6.5 Bad image

6.6 Fax & Phone Problems

5-7

5-8

5-9

5-11

5-12

5-14

5-15

5-16

5-1

5-2

5-3

5-3

5-4

5-5

5-6

5-17

5-18

5-21

5-22

5-23

5-25

6-1

6-4

6-8

6-12

6-16

6-23

Continued

6.7 Copy Problems

6.8 Scanning Problems – Causes and Solutions

6.9 Toner Cartridge Service

6.10 Software Problems – Causes and Solutions

6.11 Windows Problems

6.12 SyncThru Installation Problems

7. Exploded Views & Parts List

7.1 Main

7.2 Cover Housing

7.3 Front Cover

7.4 Rear Cover

7.5 Frame Ass'y

7.6 ADF Ass'y

7.7 Platen Cover Ass'y

7.8 Platen Ass'y

7.9 OPE Unit

7.10 RX Drive Unit

7.11 MP Tray

7.12 Fuser Unit

7.13 Paper Path Ass'y

7.14 Pick Up Unit

8.1 System Block Diagram

7-10

7-11

7-12

7-13

7-14

7-15

7-6

7-7

7-8

7-9

7-2

7-3

7-4

7-5

6-27

6-29

6-30

6-32

6-36

6-37

8-1

Continued

9. Connection Diagram

9.1 Connection Diagram

10. Reference Information

10.1 Troubleshooting Tools

10.2 Acronyms and Abbreviations

10.3 Selecting printer locations

10.4 Sample Tests Patterns

11. Circuit Description

11.1 Engine Controller

11.2 System Overview

9-1

10-1

10-2

10-4

10-5

11-1

11-7

1

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.

Precautions

(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.

Service Manual

1-1

Samsung Electronics

Precautions

1.2 Caution for safety

1.2.1 Toxic material

This product contains toxic materials that could cause illness if ingested.

(1) If the LCD control panel is damaged it is possible for the liquid inside to leak. This liquid is toxic. Contact with the skin should be avoided, wash any splashes from eyes or skin immediately and contact your doctor. If the liquid gets into the mouth or is swallowed see a doctor immediately.

(2) Please keep toner cartridges away from children. The toner powder contained in the toner cartridge may be harmful and if swallowed you should contact a doctor.

1.2.2 Electric Shock and Fire Safety Precautions

Failure to follow the following instructions could cause electric shock or potentially cause a fire.

(1) Use only the correct voltage, failure to do so could damage the printer and potentially cause a fire or electric shock.

(2) Use only the power cable supplied with the printer. Use of an incorrectly specified cable could cause the cable to overheat and potentially cause a fire.

(3) Do not overload the power socket, this could lead to overheating of the cables inside the wall and could lead to a fire.

(4) Do not allow water or other liquids to spill into the printer, this can cause electric shock. Do not allow paper clips, pins or other foreign objects to fall into the printer these could cause a short circuit leading to an electric shock or fire hazard..

(5) Never touch the plugs on either end of the power cable with wet hands, this can cause electric shock. When servicing the printer remove the power plug from the wall socket.

(6) Use caution when inserting or removing the power connector. The power connector must be inserted completely otherwise a poor contact could cause overheating possibly leading to a fire. When removing the power connector grip it firmly and pull.

(7) Take care of the power cable. Do not allow it to become twisted, bent sharply round corners or otherwise 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 recommend 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

Service Manual

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 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.

(7) Handling of the OPC Drum

- The OPC Drum can be irreparably damaged if it exposed to light.

Take care not to expose the OPC Drum either to direct sunlight or to fluorescent or incandescent room lighting. Exposure for as little as 5 mins can damage the surface’s photoconductive properties and will result in print quality degradation. Take extra care when servicing the printer. Remove the OPC Drum and store it in a black bag or other lightproof container. Take care when working with the covers(especially the top cover) open as light is admitted to the OPC area and can damage the OPC Drum.

- Take care not to scratch the green surface of OPC Drum Unit.

If the green surface of the Drum Cartridge is scratched or touched the print quality will be compromised.

Service Manual

1-3

Samsung Electronics

Precautions

1.2.5 Disregarding this warning may cause bodily injury

(1) Be careful with the high temperature part.

The fuser unit works at a high temperature. Use caution when working on the printer. Wait for the fuser to cool down before disassembly.

(2) Do not put finger or hair into the rotating parts.

When operating a printer, do not put hand or hair into the rotating parts (Paper feeding entrance, motor, fan, etc.). If do, you can get harm.

(3) When you move the printer.

This printer weighs 11.2kg including toner cartridge and cassette. Use safe lifting and handling techniques.

Back injury could be caused if you do not lift carefully.

(4) Ensure the printer is installed safely.

The printer weighs 11.2Kg, 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

Service Manual

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.

1.4 Super Capacitor or Lithium Battery Precautions

1. Exercise caution when replacing a super capacitor or Lithium battery. There could be a danger of explosion and subsequent operator injury and/or equipment damage if incorrectly installed.

2. Be sure to replace the battery with the same or equivalent type recommended by the manufacturer.

3. Super capacitor or Lithium batteries contain toxic substances and should not be opened, crushed, or burned for disposal.

4. Dispose of used batteries according to the manufacture’s instructions.

Service Manual

1-5

Samsung Electronics

2

2. Product Specifications

2.1 Product Overview

Item

Basic Model SCX-4725FN(4-in-1 Flatbed MFP)

SCX-4725F(4-in-1 Flatbed MFP)

Descriptions

Target User

Customer Benefits

(Sales Points)

Key Specification

SOHO, Economical(Speed/Price) Customer

- Compact Size

- 24ppm/A4, 24ppm/Letter fastest speed in its price class

- Favorite Copy

- ID Card Copy

- Toner Save

- up to 24ppm/A4(Up to 24ppm/Letter)

- 250 sheets Multi-Purpose type paper input/100 sheets Paper Output

- 3,000pages toner capacity

- 600dpi Print/Copy Resoulusion

- Samsung Print Language

- 32MB System memory

- 30 ADF

- 33.6 Kbps Fax Modem

- 100 Speed Dial

- 72 Hour Battery Back-up

Product Specifications

Remark

Samsung Electronics

Service Manual

2-1

Product Specifications

2.2 Specifications

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

2.2.1 General Specifications

Major Features

Item

Net Dimension (WxDxH)

Net Weight(Inc. Toner Cartridge)

CPU

LCD

Toner Save

I/O Interface

Network Interface

OS Compatibility

Power Requirement

Power Consumption

Energy Star Compliant

Power Switch

Noise Warm up

Stand by

Coping

Printing

Warm up time from Power On Status from Sleep Mode

(Recovery time)

Max. Monthly Print

Volume Scan

Average Monthly Print Volume

Average Monthly SCAN Volume

Machine Life ENGINE

Operation

SCANNER

Temperature conditions

Approval

Device Memory

Page Counter

Humidity

Print Configuration Sheet(System Data)

Descriptions (SCX-4725FN / SCX-4725F)

Copier, Print, Scan, Fax(SCX-4725FN)

438(W)*374(D)*368(H)(17.2x14.7x14.5")

11.2kg

Chorus-M (300MHz)

2 Line x 16 characters / 2Line x 8 characters(for china and korea)

Yes (With toner save button)

USB2.0

Yes

Windows 98/Me/NT4.0/2000/XP, Various Linux OS (via USB interface only) including

Red Hat 8.0~9.0, Fedora core 1~3, Mandrake 9.0~10.2, and SuSe 8.2~9.2, Mac 10.3

110 ~ 127 VAC, 50/60 Hz, 5.5A

220 ~ 240 VAC, 50/60 Hz, 3A

Sleep Mode : Under 12W

Standby Mode : 70W

Average : 400W (Print Mode)

Yes

Yes

49 dBA

35 dBA

55 dBA

53dBA

Less than 30 seconds

Less than 30 seconds

10,000 pages

ADF: 2,500 pages, PLATEN: 1,700 pages

700 pages

150 pages

5 years or 50,000 Pages. Whichever comes first

ADF : 30,000 Pages, Platen : 20,000 Pages

10°C ~ 32 °C (50°F ~ 89°F)

20 % ~ 80 % RH

Class B

32MB

Yes

Yes

2-2

Service Manual

Samsung Electronics

Product Specifications

2.2.2 Print Specifications

Item

Method

Speed

Emulation

Power Save

Resolution Normal

RET

Memory

First Print Out From Stand by

Time

Duplex

From Cold Status

Print

WHQL Compliant

Printable Area

Halftone (Gray Scale)

Descriptions (SCX-4725FN / SCX-4725F)

Laser Beam Printing

Up to 24ppm in A4 (24ppm in Letter)

PCL

Yes(Interval option: 5, 10,15, 30, 45 minute)

1200 x 1200 dpi

-

32MB

Approx. 10 seconds

Less than 30 seconds

Manual

Window XP

A4: 201.6x288.6mm

LTR: 207.6x270.6mm

Legal: 207.6x347.6mm

Folio: 207.6x322.6mm

256 levels

2.2.3 Scan Specifications

Item

Compatibility

Scan Method

PC Scan Speed Lineart, Halftone

Scan Depth

Descriptions (SCX-4725FN / SCX-4725F)

Twain standard / WIA Standard (Window 2000/XP)

600dpi Color CIS(Contact Image Sensor) Module

10sec Platen(13sec ADF) through Platen Gray

Color 300dpi

Resolution Optical

Enhanced

Halftone

Scan Size

23sec Platen (26sec ADF)

65sec Platen(70sec ADF)

600 x 600 dpi

4800 x 4800 dpi

256 levels

Max. Document Width Max.216mm (8.5")

Effective Scan Length 297 mm (11.7")

Effective Scan Width Letter/Legal: 208mm(8.2")A4: 202mm

Scan-to Button

Application

Color

Mono

Yes

Yes

24 bit

1bit for Line art, Halftone, 8 Bit for Gray scale

Service Manual

2-3

Samsung Electronics

Product Specifications

2.2.4 Copy Specifications

Copy Speed

Resolution

First Copy

Out Time

Item

Optical

Descriptions (SCX-4725FN / SCX-4725F)

Up to 22ppm in A4 (22ppm in Letter)

600*600 dpi (Scan:600*600dpi, Print: 600*600dpi)

- Text & Text/Photo mode : 600*300dpi(ADF, Platen)

- Photo mode : 600*600dpi (Platen), 600*300dpi(ADF)

Enhanced

Stand by

-

Approx. 16 seconds(ADF), Approx. 11 seconds(Platen)

From Power Save Mode Approx. 46 seconds(ADF), Approx. 40 seconds(Platen)

(110V only)

Original Image type selection

Zoom Range

Multi Copy

Preset

Text, Text/Photo, Photo

25-400%(Platen), 25-100%(ADF)

1~99 Pages

[Original(100%)], [A4 A5(71%)], [LGL LTR(78%)], [LGL 4(83%)],

[A4 LTR(94%)], [EXE LTR(104%)], [A5 A4(141%)], 25%, 50%, 150%

200%, 400%, [Custom: 25-400%)]

Darkness Control

Auto return to default mode

Changeable Default mode

ID Card Copy 2-up

4-up

Collation

Autofit

LD Card Copy

Clone

Poster

3 level (Light, Normal, Dark)

Yes (after 1 minute)- Time out option: 15, 30, 60, 180 sec., Off

Darkness, Original Type, Reduce/Enlarge, No. of Copies

Yes (ADF Only)

Yes (ADF Only)

Yes (ADF Only)

Yes (Platen Only)

Yes (Platen Only)

Yes (Platen Only)

Yes (Platen Only)

2-4

Service Manual

Samsung Electronics

2.2.5 Telephone Specificationc

Item

Handset

On hook Dial

Search

1-Touch Dial

Speed dial

TAD I/F

Tone/Pulse

Pause

Auto Redial

Last Number Redial

Distinctive Ring

Caller ID

Extention Phone Interface

Report & List Tx/Rx Journal

Print out Confirmation

Help List

Auto Dial List

System Data

Sound Control Ring Volume

Key Volume

Alarm Volume

Speaker

SCX-4725FN

No

Yes

Yes(Phone Book)

10 ea (0~9)

90 locations(10~99)

Yes

Tone Default, Pulse Changing in Tech Mode

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

No

Yes

List all user setting

Yes(Off,Low,MED,HIGH)

Yes(On,Off)

Yes(On,Off)

Yes(On,Off, Comm)

Product Specifications

Samsung Electronics

Service Manual

2-5

Product Specifications

2.2.6 Fax Specifications

Compatibility

Modem Speed

TX Speed

Compression

Color Fax

ECM

Resolution

Item

Std

Fine

S.Fine

Photo

Color

Auto Switching

Scan Speed Standard

SCX-4725FN

ITU-T G3

33.6Kbps

3sec

MH/MR/MMR/JBIG

Yes(Tx Only)

Yes

203x98dpi

203x196dpi

300x300dpi

203x196dpi

200x200dpi

Yes approx. 3sec (ADF) approx. 5sec (Platen) approx. 7sec (ADF) Fine

S.Fine

Rx fax duplex print out

Multiple page scan speed

(Memory Tx.)

Receive Mode

Memory Capacity approx. 8sec (Platen) approx. 7sec (ADF) approx. 8sec (Platen)

No

7 cpm / Ltr (Standard Resoution Res.)

Fax, TEL, Ans/Fax, DRPD

2MB (When Power off Memory Back up)

Optional Memory No

Max locations to store 99 locations to 1 Group Dial

Fax Forward Yes(On/Off)

Functions

Broadcasting

Cover page

Delayed fax

Memory RX

Voice Request

TTI

RTI

Polling

Earth/Recall

Auto Reduction

Junk Fax barrier

RDS

Security Receive

Memory Back-up

109 locations(Max locations)

N o

Yes

Yes

No

Yes

Yes

No

No

Yes

Yes

Yes

Yes

Max. 72hours

2-6

Service Manual

Samsung Electronics

Product Specifications

2.2.7 Paper Handling Specifications

Item

Input Capacity and Types

Output Capacity and Types

Manual Tray

Media size

Media Type

Paper Weight

ADF Capacity

ADF Document Size

SCX-4725FN / SCX-4725F

250-sheet Cassette Tray (75 g/ , 20 lbs)

100-sheet Face Down(75 g/ , 20 lbs)

1 sheet

A4, A5, A6, Letter, Legal, Folio, Executive, ISO B5, JIS B5, Monarch, Envelope, No.10, DL, C5, C6

76 x 127 mm (3" x 5") ~ 216 x 356 mm (8.5" x 14")

Plain Paper, Transparency, Label, Envelope, Tick, Thin, Bond, Color Paper, Card Stock, Preprinted

16~24lb (60 to 90g/ ), Cassette Tray

16~43lb (60 to 165g/ ) for 1 sheet, Manual Tray

Up to 30 sheets of 20lb(75g/ ) paper

Up to Legal

2.2.8 Software

Item

Compatibility DOS

Win 3.x

Win 95

Win 98/ME

Win NT 4.0

Win 2000

Driver

Application

Win XP

Mac

Linux

Printer

TWAIN

WIA

ScanToPC

PC-FAX

RCP

Status monitor

SmarThru4

No

No

No

Yes

No

Yes

Yes

Yes (10.3 )

Yes

PCL

Yes

Yes

Yes

Yes (Send only)

Yes

Yes

Yes

SCX-4725FN / SCX-4725F

Service Manual

2-7

Samsung Electronics

Product Specifications

2.2.9 Accessory

Items

Quick Setup Guide

Quick User Guide

S/W CD ROM

Toner Cartridge

Power Cable

Telephone Jack

Printer Cable

Tray Coner

SCX-4725FN SCX-4725F

Yes (include Setup Guide and Function Guide)

Yes (Korea Only)

3 CD (Contents; Electronic User Manual, SmarThru, Print Driver, Twain Driver, RCP)

1 EA

1 EA

No 1 EA

No

Yes

No

Yes

2.2.10 Consumables

Item

Type

How to install

Toner Yield

Code

Level Sensor

SCX-4725FN / SCX-4725F

Single Cartridge

Front door open and front loading

3,000 pages at ISO 19752 Std.

Coverage(Ships with 1,000 pages Starter Toner Cartridge)

SCX-4525D3

-

2-8

Service Manual

Samsung Electronics

2.3 Model Comparison Table

Product Specifications

Samsung Electronics

Service Manual

2-9

System Overview

3

3. System Overview

3.1 System Layout

The SCX-4725FN/4725F is roughly made up Main Control part, Operation Panel part, Scanner part, Line

Interface part and Power part. Each Part is separated Module which focus on common and standard design of different kind products. main control part adopting Fax & LBP Printer exclusive Controller is chorus-M

CPU(ASIC) and 1 Board. Scanner part is composed of ADF and Platen and is connected with Main by

Harness.

Samsung Electronics

Service Manual

3-1

System Overview

3.1.1 Feeding section

There is a universal cassette which automatically loads paper and the manual feed which supplies paper single sheet at a time. The cassette has a friction pad which separates paper to ensure single sheet feeding, and it has a sensor, which checks when the paper tray is empty.

- Feeding Method: MP Cassette Type

- Feeding Standard: Center Loading

- Feeding Capacity: Cassette-150 sheets (75g/m2, 20lb paper standard)

Manual 1 sheet (Paper, OHP, Envelop, etc.)

- Paper detecting sensor: Photo sensor

- Paper size sensor: None

3.1.2 Transfer Ass’y

This consists of the PTL (pre-transfer lamp) and the Transfer Roller. The PTL shines a light onto the OPC drum. This lowers the charge on the drum’s surface and improves transfer efficiency.

The transfer roller transfers toner from the OPC drum surface to the paper.

- Life expectancy: Over 50,000 sheets (at 16~30°C)

3.1.3 Driver Ass’y

- Gear driven power unit. The motor supplies power to the paper feed unit, the fuser unit, and the toner cartridge.

3.1.4 Fixing Part(Fuser)

- The fuser consists of the Heat Lamp, Heat Roller, Pressure Roller, Thermistor, and Thermostat. It fixes toner to the paper using pressure and heat to complete the printing job.

3.1.4.1 Temperature-Intercepting Device (Thermostat)

The thermostat is a temperature sensing device, which cuts off the power to the heat lamp to prevent overheating fire when the heat lamp or heat roller overheats.

3.1.4.2 Temperature Detecting Sensor (Thermistor)

The Thermistor detects the surface temperature of the heat roller, this information is sent to the main processor which uses this information to regulate the temperature of the heat roller.

3.1.4.3 Heat Roller

The surface of the Heat Roller is heated by the Heat Lamp. As the paper passes between the Heat and

Pressure rollers the toner is melted and fixed permanently to the paper. The surface of the roller is coated with Teflon. This ensures that toner does not adhere to the roller surface.

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3.1.4.4 Pressure roller

The Pressure Roller mounted under the heat roller, it is made of a silicon resin, and the surface of the roller is coated with Teflon. This ensures that toner does not adhere to the roller surface.

3.1.4.5 Safety Features

• To prevent overheating

- 1st protection device: Hardware cuts off when overheated

- 2nd protection device: Software cuts off when overheated

- 3rd protection device: Thermostat cuts off mains power to the lamp.

• Safety device

- Fuser power is cut off when the front cover is opened

- LSU power is cut off when the front cover is opened

- The temperature of the fuser cover's surface is maintained at less than 80°C to protect the user and a caution label is attached where the customer can see it easily when the rear cover is opened.

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System Overview

[Case part figure]

COVER-M_MIDDLE

COVER-M_JAM

STACKER

COVER-M-SIDE R

EXTEND-SMALL

EXTEND-LARGE

COVER-M_REAR

COVER-M-SIDE-L

[Scan part figure]

SCAN

UPPER

ADF

GLASS

SCAN

GLASS

KEY & OPE

COVER

FIXING BKT

SPEKER

COVER-M_DEVE

TRAY CASSETTE

MOTOR

ASS'Y

CIS

SCAN

LOWER

TIMING

BELT

SLIDER

-CIS

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3.2 Engine H/W Specification

1) Recording Method : LSU(Laser Scanning Unit)

2) Printing Speed : 24ppm

(In continuing printing base Letter, printing pages from 2nd to last during 1min)

3) Recording Density : 1200 dpi

4) Cassette Capa. : Cassette ; 250sheets(75g/ Base), 1-sheet Feeding : N/A((DRIVE Selection : Paper, OHP,

Envelop - 1 sheet)

5) Manual Tray : All paper 1 sheet

6) Paper Size : Cassette ,Manual ; Width = 76 ~ 216mm, Length = 125mm ~ 356mm

7) Effective recording size

- A4 :202 x 291 mm

- Letter : 208 x273mm

- Legal : 208 x 350 mm

- Folio : 208 x 325 mm

- TopMargin: 2 2 mm

- Left, Right Margin : 2 2 mm

8) CRU(Toner Cartridge)Life : 3,000pages Printing(A4, ISO Standard Pattern Printing)

9) First Print Out Time : within 11sec ( Standby )

10) Warming up time : within 35sec (Ambient : 25 °C)

3.2.1 Main Board Control Part

Main control part of SCX-4725FN is made of ASIC(CPU, Image processor, PC I/F part include, Scan interface part,

FAX Modem part and Printing process I/F part. CPU handles the BUS control, I/O interface, scan interface, PC interface and other miscellaneous driver circuit.

1) Main Board

- Main Board has a function of sending Current Image Video Data to LSU of the machine, controlling motor

Driving Circuit and monitoring Paper Exit Sensor, Cover Open switch, OPE Panel Inputs.

2) Main Controller

- CPU : Chorus-M is the main CPU and is made up on the 32bit RISC architecture using ARM 920T core.

Main CPU controls the whole system according to the program code which stored in the Flash-

ROM memory.

- Operation Frequency : CPU Core -> over 300MHz, System Bus -> 100MHz

- Summary of the Key Function Block:

1.3V for internal Core, 3.3V for I/O Pad with 16KB I-Cache and 16KB D-Cache.

Image Processor included.

On-Chip clock generator with PLL.

Memory and External Bank Control.

DMA Control (16-Channel)

Interrupt Control.

2-port USB Host/1-port USB device(ver 1.1) interface control.

Parallel interface control.

UART(1-Channel)

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System Overview

Synchronous Serial Interface Control.

A/D Converter(10-bit, 8channel).

General I/O Port control.

RTC with calendar function.

S/W Assistant function(Rotator)

- Flash Memory : Stores system program and can be updated to the newer system program code through the PC interface. It stores the FAX Journal List, One Touch dial number, speed dial number, and machine configuration setup data.

Capcity : 16 Mbyte (NOR Type)

Access Time : 70 nsec

- SDRAM : SDRAM is used for Print Buffer, Scan buffer when scanning, ECM Buffer when FAX Receiving, and system working memory.

Capacity : 32 Mbyte

Access Time : 166MHz(Max)

Data Backup : 48 Hours

Backup Battery Charging Time : 100hours when completely discharged.

3.2.2 Scan Part

1) Image Signal Input Part

- Image Signal from CIS has a level of about 1.2V and is goes to ADC of Chorus2.

After ADC, CIS analog signal will be converted to 8-bit Digital signal.

2) Image Processing

- On the surface of the original paper, the light from the CIS LED reflected and goes to the CIS Sensor.

Then the light is converted to the appropriate voltage suitable for ADC input. Analog signal from CIS sensor is used for ADC input then is converted to 8-bit digital data. Image processor of the Chorus2 will do the Shading correction function at first, then Gamma correction function next. After then, the data goes to different module according to the copy or FAX resolution mode. When Text mode, the image data goes to LAT module, when Photo mode, the image data goes to Error Diffusion module, when PC-Scan mode, the image data goes directly to the PC through DMA access.

3) CIS Driving Part

Summary of the Image sensor interface is as below;

- Minimum Scan Line Time :1.5ms

- Scan Resolution : 600*600 dpi

- Scan Width : 208mm

- Function

White Shading Correction

Gamma Correction

CIS Interface

256 Gray Scale

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- CIS Supply Voltage : +3.3V

- CIS Max frequency : 5MHz

- CISLinetime

Fax/Copy - 1.5ms

PC-Scan - 4.5ms

- White output volt. : Max 0.8V

4) ADF Driving Part : Driving ADF Stepper motor, and the maximum motor speed is 2000PPS.

- MOTOR DRIVER : A3978(Allegro)

- Driving Voltage : 24V DC

- Phase : 2-2 Phase 2000PPS at Quick Scan,

2-2 Phase 1000PPS AT Fine Scan,

2-2 Phase 667PPS AT Super Fine Scan

3.2.3 FAX Section

Modem Part

BLOCK DIAGRAM

System Overview

Implemented by based on Conexant DAA (Data Access Arrangement) Solution, and is roughly composed of two kinds

Chip Solution

- CX86710 (SFX336): Existing Modem Chip which adds SSD (System Side Device) for interfacing between LSD and DIB of FM336Plus Core

- CX20493 (LSD) : LIU (Line Interface Unit) Chip which is controlled by SSD and satisfies each PSTN Requirements by modulating internal Configuration with connecting Tel Line.

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System Overview

Modem (SFX336) specification.

2-wire half-duplex fax modem modes with send and receive data rates up to 33,600 bps

V.17, V.34, V.29, V.27 ter, and V.21 Channel 2

Short train option in V.17 and V.27 ter

PSTN session starting

V.8 and V.8bis signaling

HDLC support at all speeds

Flag generation, 0-bit stuffing, ITU CRC-16 or CRC-32 calculation and generation

Flag detection, 0-bit deletion, ITU CRC-16 or CRC-32 check sum error detection

FSK flag pattern detection during high-speed receiving

Tone modes and features

Programmable single or dual tone generation

DTMF receiver

Tone detection with three programmable tone detectors

Receive dynamic range:

0 dBm to -43 dBm for V.17, V.29, V.27 ter and V.21 Channel 2

9dBm to -43 dBm for V.34 half-duplex

Digital speaker output to monitor received signal

Two16-byte FIFO data buffers for burst data transfer with extension up to 255 bytes

V.21 Channel 1Flag detect

V.21 Channel 1Flag detect

+3.3V only operation

Typical power consumption

Normal mode: 264 mW

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Signal Transition of DAA Solution

Line Interface Signal of Tel Line and LSD is Analog Signal.

2) there is A/D, D/A Converter in LSD, so Analog Signal from Tel Line is converted in Digital through A/D Converter in

DAA and transfer to SSD by DIB Capacitor

Digital Signal from SSD is converted to Analog by D/A Converter in DAA and transfer to Tel Line

Transformer transfer Clock from SSD to LSD and Clock Frequency is 4.032MHz.

LSD full wave rectifies Clock to use as inner Power supply and also use as Main Clock for DIB Protocol Sync between

LSD and SSD. Transformer transfer Clock by separating Primary and Secondary, and amplifies Clock Level to LSD by Coil Turns Ratio 1:1.16.

Clock

- Clock is supplied by transformer from SSD to LSD, and there is PWROUT to adjust output impedance of Clock

Out Driver is inside SSD and CLKSHIGH Resistor to adjust duty of HLPWR Resistor and Clock.

SSD

CLKP

CLKN

DIBP

DIBN

LSD

Clock from SSD to LSD has Differential structure of 180 phase difference for Noise Robustness

DIB Data transfer Data from SSD to LSD by Transformer, and also transfer specific data from LSD to SSD.

After transferring data from SSD, RSP is transferred and LSD recognizes RSP and change LSD to output Driver transfer

Data to SSD.

DIB Data form SSD to LSD by Transformer has Differential structure of 180 phase difference between DIBP and DIBN for

Noise Robustness

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System Overview

3.2.4 Line Interface Part

This is Connection Part between system and PSTN(Public Switched Telephone Network), and primary circuit is usually located. Main functions are Line Interface, Telephone Connection and Line Condition Monitoring.

1 Telephone Line Connection

Modular Plug : RJ-11C

LIU PBA Modular Type : 623 PCB4-4

Line Code Length : 2500 50mm

Line Code Color : Black

ON HOOK state Characteristic

1) DC Resistance

DP Dial Mode (Direct Current 30mA) : 50 ~ 300ohm

DTMF Dial Mode (Direct Current 20mA) : 50 ~ 540ohm

2) Ring Sensitivity

Ring detection Voltage : 40Vrms 150Vrms (condition :Current=25mA,Frequency=15Hz) product Margin : 30Vrms 150Vrms

Ring detection Frequency : 15.3Hz 68Hz (condition : Voltage=45Vrms,Current=25mA ) product Margin : 15Hz 70Hz

Ring detection Current : 20mA 100mA (condition : Voltage=40Vrms,Frequency=20Hz) product Margin : over 15mA

3) False Ring Sound

Ring Frequency : 750 Hz + 1020 Hz

Ring interrupt Cycle : On/Off depending on input Ring Signal Cycle.

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System Overview

3.2.5 Printing Process Part

Printing Process part is made of PC-Interface part, PVC(Priter Video Controller), LSU control part, High Voltage control part and Fuser Unit control part. PC-interface core is included in the Chorus2 ASIC and controls the PCinterface. LSU control part controls the LSU polygon motor, Laser diode, video data output so thatthe printing image can be made up on the OPC Drum.

3.2.6 Engine Paper Feeding

1) Feeding Type : MP Cassette Type

2) Feeding Standard : Center Loading

3) Feeding Qty : Cassette 150 sheets (75g/ , 20lb paper standard)

4) 1 sheet (Paper, OHP, Envelope etc.)

5) Separating Type: Cassette - Friction Pad Type

6) Manual Tray : 1 sheet

7) Driver Type : Driving by Gearing from Main Motor

8) Pick_up Roller Driver : Solenoid

9) Pick up Roller Rubber Material : EPDM+IR =1.3 or more

10) Pick up Velocity : 94.8731mm/Sec (Process : 93.0667mm/sec)

11) Paper detecting Sensor : Photo Sensor

12) Paper Size Sensor : None

13) Paper Separating Pad Material : NBB 52 °, =0.8~1.2

14) Separating Pad Pressure : TBD 150 gf

15) Pick_up Roller RPM : 47.683 RPM

16) Feeding Pressure (Same as Transfer Roller)

17) Paper Exit Type : Face Down

18) Feed Roller Force : TBD Kg.f or more.

19) Spring Feed Tensile Force : TBD gf

20) Feed roller Velocity : mm/sec

21) Feed Roller Material

22) Exit Sensor : Photo Sensor

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System Overview

3.3 Deve

l

ope Process

- Developing Method : Non magnetic 1 element contacting method

- Toner : Non magnetic 1 element shatter type toner

- Toner Qty:35gf /60gf (1k/3k)

- The life span of toner 1k/3k sheets (ISO Standard Coverage )

- Toner Residual Sensor : None

- OPC Cleaning : Use the conventional cleaning blade

- Handling of wasted toner : Discard by collecting waste-toner at waste-toner bin.

- OPC Drum Protecting Shutter : None

- Classifying device for toner cartridge: ID is classified by interruption of the frame channel.

- Development Roller type : conductive elastic roller

- Doctor BLADE Type : Regulating toner layer by pressure

- Charge Roller Type : Conductive Roller Contact-Charge

3.3.1 Fuser Specification

1) Heat Lamp

- Heat Lamp Terminal Shape : Terminal Single Type

- Voltage 120 V : 115 5 %, 220 V : 230 5 %

- Capacity : 750 Watt 30 W

- Light Qty Distribution : 140%

- Life : 3000 Hr

2) Thermostat

- Thermostat Type : Non-Contact type THERMOSTAT

- Control Temperature : 150°C 5°C

3) Thermistor

- Thermistor Type : HF-R0060 (SEMITEC 364FL Type)

- Temperature Resistance : 7 k (180 °C)

- SYSTEM Temperature SETTING

Stand by : 165 5°C

Printing : 175 5°C(5 minutes before)

170°C 5°C(5 minutes after)

Overshoot: 200°C or less

Overheat :210°C or less

4) Safety Relevant Facts

- Protecting device when overheating

1st protecting device : H/W cuts off when detecting an overheating

2st protecting device : S/W cuts off when detecting overheating

3st protecting device : Thermostat cuts off the power

- Safety device

The power of Fuser is cut-off after front cover is open.

The overheating safety device for customer

The surface temperature of the Fuser Cover is under 80°C

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System Overview

3.4 Sanner Part

600dpi Color CIS Module for Flat bed, SCX-4725FN uses the CIS scanning method

1) CIS SPEC

- Scanning size : 216 mm ( width for letter-size)

- Light source : LED

- Scanning sensor: CIS 600/300 dpi

- Scanning mode : Color SCAN / Mono SCAN

- MTF : 30% (300 dpi Chart)

- CIS interface : Analog output

- Power supply : 3.3V

- Clock Frequency: 5.5MHz max.

- Number of output : 1

- LED Current : Green/Blue : 50mA, Red : 60mA

- Clamp Level : 1.4V

- Connection : 12 pin FFC connector (pitch 1.0mm)

2) Scan Resolution

(a) Transmission

- Normal : Vertial: 3.85 Line/mm, Horizontal: 8 Pels/mm :203 x 98dpi

- Fine : Vertial: 7.7 Line/mm, Horizontal: 8 Pels/mm :203 x 196dpi

- Super Fine : Vertial: 11.8 Line/mm, Horizontal: 11.8 Pels/mm ;300 x 300dpi

(b) When Copy : Vertial: 11.8 Line/mm, Horizontal: 23.6 Pels/mm :600x300dpi(ADF)

Vertial: 23.6 Line/mm, Horizontal: 23.6 Pels/mm :600x600dpi(Platen)

3) Half Tone (Gray Scale) : 256 Levels

4) Scan Line Time

(a) Tx

- Normal : 1.5 ms/Line

- Fine : 1.5 ms/Line

- Super Fine : 1.5 ms/Line

(b) Copy : 1.5 ms/Line

(c) Scan

- Color : 4.5msec/line

- Gray : 4.5msec/line

- Mono : 4.5msec/line

5) Scanning Width

- MAX SCAN WIDTH : 216 mm (8.5 inches)

- Effective Scan Width: 208mm

6) ADF Motor

(a) Motor Spec

-

-

: 24VDC

: 0.6A(Peak)

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7) Motor Driver speed & method

(a) FAX Transmission

- Normal Mode : 2000 pps, 2-2

- Fine Mode : 1000 pps, 2-2

- Super Fine Mode : 667 pps, 2-2

(b) Copy Job : 667 pps, 2-2

- max(30sheets) : 50gf

- min(1sheets) : 20gf

8) Document Detect sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED - max current : 30mA

- max voltage : 3.3V

(d) Output - Logic "H" : No Paper

- Logic "L" : Paper

(e) Lever-Sensor DOC : ADF Lower Torsion Spring

9) Regi Detect sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED - max current : 50mA

- max voltage : 3.3V

(d) Output - Logic "H" : No Paper

- Logic "L" : Paper

(e) Lever-Sensor DOC : ADF Lower Torsion Spring

10) Document Scan sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED : - Max current : 50mA

- Max Voltage : 3.3V

(d) Output - Logic "H" : Off(No Position), No Paper

- Logic "L" : On (Doc Position), Paper

(e) LEVER - SENSOR SCAN : Scan Lower Torsion Spring

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System Overview

3.5 OPE(Operational Panel Equipment)

1) Ope Panel

OPE Panel has a MICOM Chip on it and communicates with Main CPU using Serial communication

Line(SIO). OPE Panel consists of Micom, Key Matrix Part, LED Driving Part and LCD Part.

2) Key Description

No Part

1 Common

Feature

3*4Key

Start

Stop/Clear

Function

Dialing and Option Input

Starting Fax/Copy Job

Cancel Current Job/Return to default

Upper Level

2 Save

3 Copy

4 Fax

5 Scan

Toner Save

Reduce/Enlarge

No.of Copies

Original Type

Darkness

Favorite Copy

Resolution

Phone Book

Broadcasting

On Hook Dial

Redial / Pause

Scan to

Return to upper level menu

Next menu or Next option item

Previous menu or Previous option item

TONER SAVE MODE select

Select ZOOM ratio when copy

Select the number of copies

Change Copy Modes(Text,Text/Photo,Photo)

Change the Darkness of the Copied image (Light/Normal/Dark)

Select one of the predefined Copy templates.

STANDARD>FINE>SUPER

FINE>PHOTO>COLOR

Search the user defined Phone number.

When sending FAX data to many place in the same time.

On Hook Dial

Last number Redial / Pause select [scan to PC], [scan to FAX], [scan to E-mail] function.

3) LCD Part

- Number of Characters : 16 Characters x 2 line

Clock, Date display

System Status display

Alarm, Error Message display

Function Dialog Message display

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System Overview

3.6 SMPS & HVPS

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 back of the machine. Power part is divided by two independent PBAs - SMPS PBA and HVPS PBA. SMPS PBA supplies the DC power for driving the system and supplies the AC power to the fuser.

SMPS has two output channels : +5V and +24V. HVPS PBA supplies High voltage to the developer part to make a printing image on the paper. High voltages applied to the MHV, THV, DEV, SUPPLY.

3.6.1 SMPS

1) AC Input

- Input Rated Voltage : AC 220V ~ 240V / AC 110V ~ 127V

- Input Voltage fluctuating range: AC 180V ~ 270V / AC 100V ~ 135V

- Rated Frequency : 50/60 Hz

- Frequency fluctuating range : 47 ~ 63 Hz

- Input Current : Under 4.0Arms / 2.5Arms

(But, the status when lamp is off or rated voltage is inputted/outputted )

2) Rated Output Power

NO Items

1 CHANNEL

CH1

+5V

3 Rated Output

4 Max. Output current

5V PIN : #5pin

GND PIN: #6pin

+5V ± 5%(4.75 ~ 5.25V)

0.8 A

5 Peak Loading current 1.0 A

6 RIPPLE NOISE Voltage 100mVp-p or less

9 Protection for loading shortage and overflowing current

CH2

+24.0V

CON 2

24V PIN: #2, #3, #4

GND PIN: #7pin

+24V -10%/+15%(21.6V ~ 27.6V)

2.5 A

2.7 A

500mVp-p or less

2.5W

4W

36W

55.2W

Fuse Protection or Shutdown Fuse Protection or Shutdown within 1.5A ~ 3.0A range.

within 3.5A ~ 4.5A range.

Remarks

Jam cover switch included within 1ms Duration

1ms

3) Consumption Power

NO Item CH1(+5V)

1

2

3

Stand-By

Printing

Sleep-Mode

0.6 A

0.8 A

0.5 A

1.3 A

1.9 A

0.3 A

AVG : 70Wh

AVG : 400Wh

AVG : 12Wh

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4) Power Cord Length : 1830 50mm

5) Power Cord Switch : Exist

6) Feature

- Withstand Resistance : 100 or more (at DC 500V)

- Insulating revisiting pressure : Must be no problem within 1 min. (at1000Vac,10mA)

- Leaking Current : under 3.5mA

- Running Current : under 40A PEAK (AT 25 °C,COLDSTART) under 50A PEAK (In other conditions)

- Rising Time : within 2Sec

- FallingTime : over 20ms

- Surge : Ring Wave 6KV-500A (Normal, Common)

7) Environment Condition

- Operating temperature range : 0 °C ~ 40 °C

- Maintaining temperature range : -20 °C ~ 40 °C

- Preserving Humidity Condition : 10% ~ 90% RH

- Operating atmospheric pressure range : 1atm

8) EMI Requirement : CISPR, FCC, CE, MIC,

9) Safety Requirement : IEC950 UL1950, CSA950, C-UL, Semko, EK, CB, CCC(CCIB),GOST, EPA,

3.6.2 HVPS Board

The HVPS board creates the high voltage of THV/MHV/Supply/Dev and supplies them to the developer part for making best quality printing image. The HVPS part takes the 24V and outputs the high voltage such as

THV/MHV/Supply/Dev, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer roller.

(a) Transfer High Voltage (THV+)

- Input Voltage : 24 V DC +15% / -10% (21.6V~27.6V)

- Out Voltage : +1300KV 1.5% (200 Load )

- Out Voltage Trigger : 6.5

- Input Voltage Variation : 5 %

Load Variation : 5 %

- Out Voltage Rising Time : 100 ms Max

- Out VoltageFalling Time : 100 ms Max

- Transfer Variation Voltage on Environment Variation : +500 V ~ +5000V

- Control Method on environment : THV-PWM ACTIVE, transfer Active signal, of environment sensing voltage is input and get feed back current, and recalculate it to resistance .

- Control method on transfer output voltage : It is controlled by changing its duty of THVPWM Signal as follows. 10% Duty : +500V, 90% Duty : +5000V

(b) Charge Voltage (MHV)

- Input Voltage : 24 V DC +15% / -10% (21.6V~27.6V)

- Out Voltage : -1300KV 50V(50 Load)

- Out Voltage Rising Time : 50 ms Max

- Out VoltageFalling Time : 50msMax

- Out Voltage Range : 30 ~ 1000

- Output Control Signal(MHV-PWM) : Active Low PWM signal for controlling MHV

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(c)Developing Voltage (DEV)

- Input Voltage : 24V DC +15% / -10% (21.6V~27.6V)

- Output Voltage: -350V 20V (50 Load)

- Output Voltage Fluctuation range: PWM Control

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

- Loading contrast : 5 %orless

- Output Voltage Rising Time : 50 ms Max

- Output Voltage Falling Time : 50 ms Max

- Output Loading range : 10 ~1000

- Output Control Signal (BIAS-PWM) : Active Low PWM signal for controlling MHV

(d) Supply

- Output Voltage : -550V 50V(50 Load)

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

- Loading contrast : 5 %orless

- Output Voltage Rising Time : 50 ms Max

- Output Voltage Falling Time : 50 ms Max

- Output Loading range : 10 ~ 1000

- Output Control Signal (BIAS-PWM) : Active Low PWM signal for controlling MHV

3.7 FUSER AC POWER CONTROL

The Fuser(HEAT LAMP) gets heat from AC power. The AC 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 'HEATERON' signal is turned on at engine,the LED of PC102 (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 heat lamp, and heat is occurred.

On the other hand, when the signal is off, the PC102 is off, the voltage is cut off at the gate of Triac, the Triac becomes off, and then the heat lamp is turned off.

1) Triac feature : 16A, 600V SWITCHING

2) Phototriac Coupler (PC102)

- Turn OnIf Current : 15mA~50mA(Design : 16mA)

- High Repetive Peak Off State Voltage : Min 600V

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Alignment and Adjustments

4

4. Alignment and Adjustments

4.1 User Mode

The table below shows the map of User settings available in User Mode. These are fully described in the

User Guide and are not included here.

Default Value 1st level

RETURN -left/right && Enter --

1. Paper Setting

Paper Type

1

14 character

Paper Type

2.Machine Setup

Machine ID

2 Paper Size

1

2

3

4

Machine ID

(Only SCX-4521F)

Date & Time

(only SCX-4521F)

Clock Mode

(only SCX-4521F)

Language

2nd level

RETURN left/right && Enter

Plain Paper, Thick, Thin,

Bond, Colored, Card stock, Labels, Transparency,

Envelope, Preprinted

A4, Legal, Executive, Folio

A5, B5, A6, Letter

Fax:

ID:

00-00-0000

00:00(AM)

12, 24 hours

3rd level

[English/FRANCAIS/Espanol/

Portugues/Deutsch/Italiano/

Pycckn/Norsk/Polski/Suomi/

Magyar/Dansk/Solvencina cestina/Svenska/Turkse

- 16 language

On

Off

On

Off

5, 10, 15, 30, 45 min.

Plain Paper

By Country

12hours

English

5 5 Power Save

6 Ignore Toner

7 Select Country

Service Manual

4-1

Samsung Electronics

Alignment and Adjustments

1st level

RETURN -left/right && Enter --

3.Copy Setup

Default-Change

1

14 character

Default-Change

4. Fax Setup

(only SCX-4725FN)

Receive Mode

5. Fax Feature

Delay Fax

6. Advanced fax

Toll Save

12

1

2

3

8

9

10

11

4

1

2

6

7

4

5

2

3

2

1

Timeout

Receive Mode

Ring to Answer

Darkness

Redial Term

Redials

MSG Confirm

Image TCR

Auto Report

Auto Reduction

Discard Size

RCV Start Code

DRPD Mode

Delay Fax

Priority Fax

Add Page

Cancel Job

Toll Save

Junk Fax Setup

7. Reports

Phone Book

3

4

1

2

5

6

3

4

5

6

7

Secure Receive

Prefix Dial

Stamp RCV Name

ECM Mode

Phone Book

Sent Report

RCV Report

System Data

Scheduled Jobs

MSG Confirm

Junk Fax List 10 ea

2nd level

RETURN left/right && Enter

Darkness

Original Type

Reduce/Enlarge

No. of Copies

Off. 15,30,60,120Sec, Off

Fax, Tel, Ans/Fax

1~7

Light/Normal/Dark

1~15Min

1~13times

On, Off, On-Error

On, Off

On, Off

On, Off

0~30mm

0~9 set

Enter Number

Enter Number

Operation Not Assigned

Operation Not Assigned

On,Off

On

Off

On,Off, Print

FAX: xxxxx (5 digits)

On, Off

On, Off

3rd level

Light/Normal/Dark

Text, Text/Photo, Photo

[Original(100%)]

[LGL LTR(78%)]

[LGL A4(83%)]

[A4 A5](71%)]

[A4 LTR(94%)]

[EXE LTR(104%)]

[A5 A4](141%)]

25%

50%

150%

200%

400%

[Custom:25-400]

[1-99]

Start Time/ End Time

Fax:

Default Value

Normal

Text

100%

Off

Off

Off

Off

On

1

30sec

2

Normal

3minutes

2times

On-Error

On

On

20mm

*9*

4-2

Service Manual

Samsung Electronics

Alignment and Adjustments

<continue..>

1st level

RETURN -left/right && Enter --

8. Network Setup

(only SCX-4725FN)

Reset Network

9. Sound/Volume

Speaker

0. Maintenance

Clean Drum

3

4

1

2

3

4

1

2

3

4

1

2

14 character

Reset Network

Config Network

Set to Default

Print Net CFG

Speaker

Key Sound

Alarm Sound

Clean Drum

Auto Cleaning

Notify Toner

Clear Memory

2nd level

RETURN left/right && Enter

Yes, No

TCP/IP, Ether Talk

Yes, No

Yes, No

On, Off, Comm.

On, Off

On, Off

Yes, No

On, Off

All Settings

Clear All Mem.

Paper setting

Copy Setup

Fax Setup

Fax Feature

Advanced Fax

Sent Report

RCV Report

Phone Book

3rd level

Manual, DHCP, BOOTP

Default Value

Comm.

Med

Off

On

Off

Off

Off

Samsung Electronics

Service Manual

4-3

Alignment and Adjustments

4.2 Tech Mode and Setting

4.2.1 How to Enter Tech Mode

In service (tech) mode the technician can check the machine and perform various tests to help with failure diagnosis.

When in Tech mode the machine still performs all normal operations.

To enter the Tech mode (SCX-4725FN)

To enter the Tech mode press briefly displays ‘TECH’, the machine has entered service (tech) mode. in sequence and the LCD

To enter the Tech mode (SCX-4725F)

To enter the Tech mode press in sequence and the LCD briefly displays ‘TECH’, the machine has entered service (tech) mode.

4-4

Service Manual

Samsung Electronics

Alignment and Adjustments

4.2.2 Setting-up System in Tech Mode

1st level

RETURN -left/right && Enter --

Tech Mode

Data Setup

1

14 character

Data Setup

2

Machine Test

3

Report

Clear All Mem.

Clear Count

Flash Upgrade

Silence Time

Ignore Toner

Test Param Set

Switch Test

Modem Test

Dram Test

Rom Test

Pattern Test

Shading Test

Protocol

System Data

Error Info

2nd level

RETURN left/right && Enter

Send Level

Modem Speed

Error Rate

Notify Toner

3rd level Default Value

09-15 -12

33.6, 28.8, 14.4, 12.0, 9.6, 4.8

33.6

5%, 10%

Customer No.

10%

Customer Name

Service No.

Serial No.

Select Country

Enter Password

[ ]

Local

Off/ 12 Sec/Unlimited

On, Off

00-50

Off

Off

55

Samsung Electronics

Service Manual

4-5

Alignment and Adjustments

4.2.3 Setting

4.2.3.1 Changing the Display Language

To change the language that displays on the control panel, follow these steps:

1.

Press Menu until “Machine Setup” appears on the top line of the display.

2.

Press the scroll button ( or ) until “Language” appears on the bottom line of the display.

3.

Press Enter. The current setting appears on the bottom line of the display.

4.

Press the scroll button ( or ) until the language you want appears on the display.

5.

Press Enter to save the selection.

6.

To return to Standby mode, press Stop/Clear.

4.2.3.2 Setting the Machine ID

In some countries, you are required by law to indicate your fax number on any fax you send. The Machine

ID, containing your telephone number and name (or company name), will be printed at the top of each page sent from your machine.

1.

Press Menu until “Machine Setup” appears on the top line of the display. The first available menu item,

“Machine ID,” displays on the bottom line.

2. Press Enter. The display asks you to enter the fax number.

If there is a number already set, the number appears.

3.

Enter your fax number using the number keypad.

NOTE: If you make a mistake while entering numbers, press the button to delete the last digit.

4.

Press Enter when the number on the display is correct. The display asks you to enter an ID.

5.

Enter your name or the company name using the number keypad.

You can enter alphanumeric characters using the number keypad, and include special symbols by pressing the 0 button.

For details on how to use the number keypad to enter alphanumeric characters.

If you want to enter the same letter or number in succession, enter one digit, move the cursor by pressing the button and enter the next digit.

If you want to insert a space in the name, you can also use the button to move the cursor to skip the position.

6.

Press Enter when the name on the display is correct.

7.

To return to Standby mode, press Stop/Clear.

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Samsung Electronics

Alignment and Adjustments

4.2.3.3 Setting the Date and Time

When you turn your machine on for the first time, the display prompts you to enter the current date and time.

After entering, it will not appear anymore. For the SCX-4 725 F N , all of your faxes will have the date and time printed on them.

NOTE: If power to the machine is cut off, you need to reset the correct time and date once the power has been restored.

1.

Press Menu until “Machine Setup” appears on the top line of the display.

2.

Press the scroll button ( or ) to display “Date & Time” on the bottom line and press Enter.

3.

Enter the correct time and date using the number keypad.

For the SCX4725 , press the scroll button ( or ) to enter the time and date.

Month = 01 ~ 12

Day = 01 ~ 31

Year = requires four digits

Hour = 01 ~ 12 (12-hour mode)

00 ~ 23 (24-hour mode)

Minute = 00 ~ 59

NOTE: The date format may differ from country to country.

You can also use the scroll button ( or ) to move the cursor under the digit you want to correct and enter a new number. For the SCX-4 725 , you can use Enter or Upper Level to move the cursor.

4.

To sel ect “ AM” or “PM” for 12-hour format, press the or # button or any number button.

For the SCX-4 725 , press Enter and then the scroll button ( or ).

When the cursor is not under the AM or PM indicator, pressing the or # button immediately moves the cursor to the indicator. For the SCX-4 725 , press the scroll button ( or ) to move the cursor to the indicator.

You can change the clock mode to 24-hour format (e.g. 01:00 PM as 13:00).

5.

Press Enter when the time and date on the display is correct.

When you enter a wrong number, the machine beeps and does not proceed to the next step. If this happens, just reenter the correct number.

6.

To return to Standby mode, press Stop/Clear.

4.2.3.4 Changing the Clock Mode

You can set your machine to display the current time using either a 12-hour or 24-hour format.

1.

Press Menu until “Machine Setup” appears on the top line of the display.

2.

Press the scroll button ( or ) until you see “Clock Mode” on the bottom line and press Enter.

The clock mode currently set for the machine displays.

3.

Press the scroll button ( or ) to select the other mode and then press Enter to save the selection.

4.

To return to Standby mode, press Stop/Clear.

Service Manual

4-7

Samsung Electronics

Alignment and Adjustments

4.2.3.5 Setting the Paper Size and Type

After loading paper in the tray, you need to set the paper size and type using the control panel buttons.

These settings will apply to copy and fax modes. For PC-printing, you need to select the paper size and type in the application program you use on your PC.

1.

Press Menu.

The display shows “Paper Setting” on the top line of the display.

2.

Press the scroll button ( or ) to display “Paper Size” on the bottom line and press Enter to access the menu item.

3.

Use the scroll button ( or ) to find the paper size you are using and press Enter to save it.

4.

Press the button to scroll to “Paper Type” and press Enter to access the menu item.

5.

Use the scroll button ( or ) to find the paper type you are using and press Enter to save it.

6.

To return to Standby mode, press Stop/Clear.

4.2.3.6 Setting Sounds

You can control the following sounds:

• Speaker: You can turn on or off the sounds from the telephone line through the speaker, such as the dial tone or a fax tone. With this option set to “Comm.” the speaker is on until the remote machine answers.

• Ringer: You can adjust the ringer volume.

• Key Sound: With this option set to “On” a key tone sounds each time a key is pressed.

• Alarm Sound: You can turn the alarm sound on or off. With this option set to “On” an alarm tone sounds when an error occurs or fax communication ends.

• You can adjust the volume level using the On Hook Dial button.

4.2.3.7 Speaker, Ringer, Key Sound, and Alarm Sound

1.

Press Menu until “Sound/Volume” appears on the top line of the display.

2.

Press the scroll button ( or ) to scroll through the options. Press Enter when you see the desired sound option.

3.

Press the scroll button ( or ) to display the desired status or volume for the option you have selected. You will see the selection on the bottom line of the display. For the ringer volume, you can select “Off,” “Low,” “Med,” and “High”. Setting “Off” means that the ringer does not sound. The machine works normally even if the ringer is turned off.

4.

Press Enter to save the selection. The next sound option appears.

5.

If necessary, repeat steps 2 through 4.

6.

To return to Standby mode, press Stop/Clear.

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Service Manual

Samsung Electronics

Alignment and Adjustments

4.2.3.8 Speaker Volume

1.

Press On Hook Dial. A dial tone sounds from the speaker.

2.

Press the scroll button ( or ) until you hear the volume you want. The display shows the current volume level.

3.

Press On Hook Dial to save the change and return to Standby mode.

NOTE: You can adjust the speaker volume only when the telephone line is connected.

4.2.3.9 Toner Save Mode

Toner Save mode allows your machine to use less toner on each page. Activating this mode extends the life of the toner cartridge beyond what one would experience in the normal mode, but it reduces print quality.

To turn the toner save mode on or off, press Toner Save.

• If the button backlight is on, the mode is active and the machine uses less toner when printing a document.

• If the button backlight is off, the mode is deactivated and the machine prints with the normal quantity of toner.

4.2.3.10 Power Save Mode

Power Save mode allows your machine to reduce power consumption when it is not in actual use. You can turn this mode on and select a length of time for which the machine waits after a job is printed before it switches to a reduced power state.

1.

Press Menu until “Machine Setup” appears on top line of the display.

2.

Press the scroll button ( or ) until “Power Save” appears on the bottom line. Press Enter.

3.

Press the scroll button ( or ) to display “On” on the bottom line and press Enter.

Selecting “Off” means that the power save mode is deactivated.

4.

Press the scroll button ( or ) until the time setting you want appears.

The available options are 5, 10, 15, 30, 60 and 120 (minutes).

5.

Press Enter to save the selection.

6.

To return to Standby mode, press Stop/Clear.

Service Manual

4-9

Samsung Electronics

Alignment and Adjustments

4.2.4 FLASH UPGRADE

There are 2 methods to update the Flash Rom, Local and Remote.

(1) Local Machine

• RCP (Remote Control Panel) mode

This method is for Parallel Port or USB Port. Connect the PC and activate the RCP (Remote Control Panel) to upgrade the Firmware.

< Method >

How to Update Firmware using RCP

1. Connect PC and Printer with a Parallel Cable or a USB Cable.

2. Run the RCP utility and select Firmware Update.

3. Search for the Firmware file to be used to update the set using the Browse Icon.

4. Click the Update icon. The firmware file is transmitted to the Printer automatically and the printer is initialized when the download completes.

5. Click the Refresh icon and check that the updated version numbers are displayed.

• DOS Command mode

This method is ONLY for Parallel Port. Connect the PC to the set using a Parallel Cable and enter the DOS

Command to upgrade the firmware.

< Method >

1. First of all you need the following files : down.bat, down_com.bin, fprt.exe, and Rom File: (file name for upgrade). Ensure you save ALL of these files in the same folder.

2. At the DOS prompt enter the correct command (as shown below) and push the enter key.

Then the upgrade will automatically take place..

3. There are two commands use the correct one depending on the condition of the set..

* When the product is in the idle condition

down "rom file"

* When the product is in Ready condition

(TECH MODE --> DATA SETUP --> FLASH UPGRADE --> LOCAL)

copy/b "rom file" lpt1

4. Do not turn off the power during the upgrade process.

(2) Remote FAX

It is possible to use a set that already has the latest firmware to upgrade a remote set remotely using the telephone system.

< Method >

1. On the set that has the latest firmware set it toi transmit the upgrade:-

(TECH MODE •DATA SETUP•••• FLASH UPGRADE•••• REMOTE)

2. Enter the telephone number of the set that needs to be upgraded.

(Several faxes can be upgrade at the same time. In this case, enter each fax number.)

3. When the enter button is pressed the set sends the firmware file by calling designated fax number.

(Around 10~15 minutes are needed to send the file.)

< Caution >

1. The Sending and Receiving fax machines MUST be the same model.

2. The sending fax must be set up in ECM mode and the Receiving fax memory must be 100%.

If not the function will not work.

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Service Manual

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Alignment and Adjustments

4.2.5 Machine Test

SWITCH TEST

Use this feature to test all keys on the operation control panel. The result is displayed on the LCD window each time you press a key.

MODEM TEST

Use this feature to hear various transmission signals to the telephone line from the modem and to check the modem, amplifier and speaker. If no transmission signal sound is heard, it means the modem part of the main board, amplifier, speaker or speaker harness is faulty.

DRAM TEST

Use this feature to test the machine's DRAM. The result appears in the LCD display.

If all memory is working normally, the LCD shows << O K >>

ROM TEST

Use this feature to test the machine's ROM. The result and the software version appear in the LCD display.

• FLASH VER : 1.00 V

• ENGINE VER :1.00V

PATTERN TEST

Using this pattern printout you can check that the printer mechanism is functioning properly.

This function is for factory manufacturing use only.

SHADING TEST

The function is used to set the optimum scan quality determined by the specific characteristics of the

CIS(Contact Image Sensor). If copy image quality is poor perform this function to check the condition of the CIS unit.

< Method >

1. Select the [Shading Test] in TECH MODE

(Menu, #, 1934).

2. Push the ENTER button and an image will be scanned.

3. After scanning the CIS SHADING PROFILE will be print out.

4. If the printed image is different to the sample image shown the CIS is defective.

NOTICE : When you test the CIS, make sure that the cover is closed.

MAX=229 Min=168 Avg=193 Diff=15 PRNU=6

MAX=234 Min=174 Avg=200 Diff=14 PRNU=7

MAX=241 Min=179 Avg=204 Diff=14 PRNU=4

MAX=240 Min=176 Avg=202 Diff=15 PRNU=6

Service Manual

4-11

Samsung Electronics

Alignment and Adjustments

4.2.6 Report

PROTOCOL LIST

This list shows the sequence of the CCITT group 3 T.30 protocol during the most recent sending or receiving operation. Use this list to check for send and receive errors. If

SYSTEM DATA

This list provides a list of the user system data settings and tech mode settings.

KEY HISTORY

This list shows th input key history.

ERROR INFO

This list display the detail machine error list.

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Service Manual

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Alignment and Adjustments

4.3 Control Panel

4.3.1 Control Panel Functions

SCX-4521F

[Reperence] This Model is Test page not Support.

Samsung Electronics

Service Manual

4-13

Alignment and Adjustments

4-14

Service Manual

Samsung Electronics

Alignment and Adjustments

4.4 LCD Status Error M

e

ssages

STATUS

Document Jam

Door Open or Jam

Cover Open

NO paper

PAPER JAM 0

PAPER JAM 1

PAPER JAM 2

Communication Error

Line Error

NO ANSWER

INCOMPATIBLE

LINE BUSY

POWER FAILURE

STOP PRESSED

MEMORY FULL

FUSER ERROR

LSU ERROR

LSU ERROR

TONER LOW

TONER EMPTY

[Line Error]

[No Answer]

[Incompatible]

Line Busy

Power Failure

[Stop Pressed]

Memory Full

CRU Fuse Error

[Hsync Error]

[LSU Error]

LCD Display

Document Jam

[Front or Rear]

[Cover Open]

[ No Paper ]

Add Paper

[Paper Jam 0]

Open/Close Door

[Paper Jam 1]

Open/Close Door

[Paper Jam 2]

Check Inside

[COMM. Error]

[Toner Low]

[Toner Empty]

[Replace Toner]

Descriptions

When Document Jam occurred at ADF module.

This is displayed on LCD, Print in the Transmission Journal.

When machine’ front side cover or Jam Cover was opened, it displayed On the LCD.

When there is no paper in CASSETTE Tray, machine Displays this message on LCD.

When the machine encountered paper jam in pick up area,

Machine displays on the LCD until DOOR OPEN & CLOSE.

When the machine encountered paper jam in paper exit of Machine, machine displays on the LCD until DOOR OPEN & CLOSE.

When the machine encountered paper jam in paper exit of Machine, machine displays on the LCD until DOOR OPEN & CLOSE.

When the machine has problem in communication, It displayed on the LCD.

Machine displays this in case of Transmission.

Machine displays this in case of fax handshaking step of Reception.

When the machine has problem in case of Fax Data reception step.

When the machine could not connect to remote fax after Completion of redial up to redial counter in system data.

Remote party did not have the requested feature, such as polling.

The remote fax didn’t answer.

When the machine’s user memory has not been backup and There was power off / on.

When the operator pressed the STOP button during transmission.

When the machine has encountered the user memory was full.

When the machine failed in installing the new toner cartridge. tech mode user mode

When the machine has encountered the Laser Beam Scanning unit could not reach the READY state.

When the machine has encountered the Toner Low.

When the machine has encountered the Toner Empty.

Service Manual

4-15

Samsung Electronics

Alignment and Adjustments

<continue..>

STATUS

BY PASS JAM

GROUP is not available

RETRY REDIAL?

LCD Display

[Bypass Jam]

Group Not Available

Retry Redial ?

NO. NOT ASSIGNED

Load document

NO. Not Assigned

Load Document

Memory full and canel the job Cancel ?

1:Yes 2:No

Job has not been created

Low Heat Error

Open Fuser Error

Over Heat Error

Memory Dial Full

Operation Not

Assigned

[Low Heat Error]

Open Fuser Error

[Over Heat]

[Jam 1]

[No Catridge]

Memory Dial Full

Descriptions

When the machine detected the non feeding from BYPASS Tray.

You have tried to select a group location where only a single

Location number can be used.

the machine is waiting for the programmed interval to automatically redial a previously busy station.

The speed dial location you tried to use has no number assigned to it.

You have attempted to set up a sending operation with no

Document loaded.

When the machine has encountered the memory full during storing the document into memory, the machine display the "CANCEL ?" to operator whether he/she make a decision the canceling the job or accept the scanned page so far to transmit the remained documents.

When operator is doing in ADD/CANCEL operation and

There is no job to handle if operator entered the job no.

Temperature could not reach certain level.

The thermister has been disconnected.

Temperature has gone up very high degree.

When the machine detected the toner cartridge has not been installed, or detected jam1 in warmup state.

During Auto dial transmission when all 15 jobs are configured and try to add 16th job

4-16

Service Manual

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Alignment and Adjustments

4.5 Engine Test Mode

The Engine Test Mode supplies useful functions to check the condition of the print engine. It tests the condition of each device and displays the result of the test on the LCD. It is divided into 5 functions (0~4), and these are shown below.

4.5.1 To enter the Engine Test Mode

To enter the Engine Test mode (SCX-4

725

FN)

Press in sequence, and the LCD briefly displays

‘Engine Test’, the machine has entered Engine Test Mode.

Press “0”, “1”, “2”, “3” or “4” to select the Test No. (see list below – left hand column)

4.5.2 Diagnostic

NO.

0

1

2

3

4

3

4

1

2

3

7

8

9

4

5

6

3

4

1

2

Sub No.

1

2

3

4

1

2

1

2

Engine test

Motor Test

Pick Up Test

Main Fan Test

SMPS FAN

LSU Error Test

LD Test

Feed Sensor Test

Exit Sensor Test

Cover Sensor Test

Empty Sensor Test

Therm ADC 170

Therm ADC 160

Therm ADC 150

Therm ADC 140

Therm ADC 130

Therm ADC 125

Therm ADC 120

Therm ADC 115

Therm ADC 110

MHV Test (1300V)

Dev Bias Test (350V)

THV Test (1300V)

THV Test (-)

Remark

1 : On, 2 : Off – next test selected

1 : On, 2 : Off – next test selected

1 : On, 2 : Off – next test selected

1 : On, 2 : Off – next test selected

1 : On, 2 : Off – next test selected

1 : On, 2 : Off – next test selected

1. Check : read the sensor

2. Next : Next Sensor test

1. Check : read the sensor

2. Next : Next Sensor test

1. Check : read the sensor

2. Next : Next Sensor test

1. Check : read the sensor

2. Next : Next Sensor test

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off (maintain the fusing temp.)

1 : On, 2 : Off

1 : On, 2 : Off

1 : On, 2 : Off

1 : On, 2 : Off

Service Manual

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Samsung Electronics

Alignment and Adjustments

4.5.3 Detail Description (Engine Test Mode)

Function Name

01.Motor Test

02.Pick Up Test

03.Fan Test

11.LSU Motor

12.LSU Error Test

13.LD Test

21.Feed Sen Test

22.Exit Sen Test

23.Cover Sen Test

24.Empty Sen Test

31.Them ADC 170

32.Them ADC 160

33.Them ADC 150

35.Them ADC 140

36.Them ADC 130

37.Them ADC 125

38.Them ADC 120

39.Them ADC 115

40.Them ADC 110

41.MHV Test (1300V)

42.Bias Test (350V)

43.THV Test (1300V)

44.THV Test (-)

Description

The main motor starts when the execution key is pressed and stops when the stop key is pressed.

Automatically stops, when the execution is chosen.

stops, when the execution is chosen.

The fan starts when the execution key is pressed and stops when the stop key is pressed.

The laser motor starts when the execution key is pressed and stops when the stop key is pressed.

The LSU motor starts and "Laser Ready" is displayed if the motor spins at the correct speed, otherwise "Laser Error" is displayed.

"Diode On" is displayed, when the laser diode is on.

Otherwise "Diode Off" is displayed.

These functions allow the current state of the sensor to be displayed.

This function allows the current state of the Cover sensor to be displayed. Touch the sensor and confirm that the message changes: "Cover Open" to " Cover Close"

These functions allow the current state of the sensor to be displayed.

"Current value" is displayed on the upper line of the LCD, and "Target value" on the bottom line.

Target value is limited from "191°C" to "80°C"

Display

Main Motor On/Off

Tray 1,2 Solenoid On/Off

Fan On/Off

Laser Motor On/Off

Laser Leady On/Off

Diode On/Off

"Sensor Off" or “ Sensor On ”

"Cover Open" or "Cover Close"

"Sensor Off" or “ Sensor On ”

Target temperature and output temperature from thermistor and ADC.

These Functions are provided to check whether the control of the HVPS is functioning correctly.

MHV On/Off

Dev Bias On/Off

THV EN/NEG On/Off

THV On/Off

4-18

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4.6 Paper Path and Clearing Paper Jams

4.6.1 Copy & Scan Document Path

Alignment and Adjustments

Samsung Electronics

Service Manual

4-19

Alignment and Adjustments

4.6.2 Printer Paper Path

1) After receiving a print command, the printer feeds paper from the main cassette or manual feeder as required.

2) The paper being fed passes the paper feed sensor. (Jam 0 occurs if the sensor is not operated within a certain time)

3) Having passed the paper feed sensor the paper moves to the paper exit sensor via printing process. (Jam 1 occurs if the sensor is not operated within a certain time)

4) The paper then passes through the paper exit sensor and out of the set. (Jam 2 occurs if the trailing edge of the paper does not pass the exit sensor within a certain time of the paper leading edge activating the exit sensor)

14

12

13

BIN PATH

12

14

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Samsung Electronics

Alignment and Adjustments

4.6.3 Clearing Paper Jams

When a paper jam occurs, “Paper Jam” appears on the display.

Refer to the table below to locate and clear the paper jam.

Message

[Paper Jam 0]

Open/Close Door

[Paper Jam 1]

Open/Close

[Paper Jam 2]

Check Inside

Location of Jam

In the tray

In the fuser area or around the toner Door cartridge.

In the paper exit area

To avoid tearing the paper, pull out the jammed paper gently and slowly. Follow the instructions in the following sections to clear the jam.

4.6.3.1 In the Tray

1. Remove the jammed paper in the tray by gently pulling it straight out.

2. Open and close the front door to resume printing.

Samsung Electronics

Service Manual

4-21

Alignment and Adjustments

4.6.3.2 In the Fuser Area or Around the Toner Cartridge

NOTE: The fuser area is hot. Take care when removing paper from the machine.

1. Open the front door and pull the toner cartridge out, lightly pushing it down.

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

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

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Alignment and Adjustments

4.6.3.3 In the Paper Exit Area

1. Open and close the front door. The jammed paper automatically exits the machine.

If the paper does not exit, continue to step 2.

2. Gently pull the paper out of the output tray.

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

NOTE: Inside of the machine is hot. Take care when removing paper from the machine.

3. If there is any resistance and the paper does not move when you pull, or if you cannot see the paper in the output tray, open the rear door by pulling the tab on it.

5. Close the rear door.

6. Open and close the front door to resume printing.

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Samsung Electronics

Alignment and Adjustments

4.6.3.4 Tips for Avoiding Paper Jams When Printing on the A5-sized Paper

If paper jams occur frequently when you print on A5-sized paper:

1. Load the paper into the tray, as shown below.

3. From the Orientation option of the Layout tab, set the Rotate option to 90 .

4. Click OK to start printing.

For details, see Software User’s Guide.

2. Open the printer’s properties window, set the paper size to A5 from the Paper tab.

4.6.3.5 Tips for Avoiding Paper Jams

By selecting the correct paper types, most paper jams can be avoided. When a paper jam occurs.

• Follow the procedures in “Loading Paper”. Ensure that the adjustable guides are positioned correctly.

• Do not overload the tray.

• Do not remove paper from the tray while your machine is printing.

• Flex, fan, and straighten the paper before loading.

• Do not use creased, damp, or highly curled paper.

• Do not mix paper types in the tray.

• Use only recommended print materials. See “Paper Specifications”.

• Ensure that the recommended print side of print materials is facing up in the tray.

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Disassembly and Reassembly

5

5. Disassembly and Reassembly

5.1 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.

Service Manual

5-1

Samsung Electronics

Disassembly and Reassembly

5.2 MP Tray

1. Open the Front Cover.

3. Hold the MP Tray and pull it to the arrow direction.

Front Cover

2. Release the Toner Cartridge.

Toner Cartridge

MP Tray

5-2

Service Manual

Samsung Electronics

Disassembly and Reassembly

5.3 Pick Up Roller

1. Before you remove the Pick Up Roller, you should remove:

- MP Tray (Refer to the 5.2)

2. When if only remove the Pick Up Rubber, first pull the Pick Up Hausing A (with Rubber) from the

Housing B in the direction of arrow and then release the Pick Up Rubber from the Housing A, as shown below.

Housing B

Housing A

(with Rubber)

5.4 Front Cover

1. Open the Front Cover.

2. To remove the Front Cover, first pull the part below the right side of the Front Cover with a light pressure to the direction of arrow(left).

1

Front Cover

2

Service Manual

5-3

Samsung Electronics

Disassembly and Reassembly

5.5 Cassette Tray

1. Open the Cassette Tray.

2. As shown below, to remove the Cassette Tray, lift the nob to the direction of the arrow with a light pressure while holding the Set(left).

2

Cassette Tray

1

5-4

Service Manual

Samsung Electronics

Disassembly and Reassembly

5.6 Rear Cover

1. Remove the four screws securing the Rear Cover and remove it.

3. To remove the Rear cover make sure the right

Power Switch doesn't get jammed to the Rear

Cover, as shown below.

Rear Cover

Sensor

PBA

2. Open the Jam Cover.

Jam Cover

4. If necessary, remove the Jam Cover in the direction of arrow, as shown below.

Jam Cover

Rear Cover

Service Manual

5-5

Samsung Electronics

Disassembly and Reassembly

5.7 Right Cover

1. Before you remove the Right Cover, you should remove:

- Front Cover (Refer to the 5.4)

- Rear Cover (Refer to the 5.6)

2. Remove the one screws securing the Right Cover.

3. Apply light pressure to the back of the Right Cover and pull it to the right side in the direction of arrow, as shown below.

Right Cover

5-6

Service Manual

Samsung Electronics

Disassembly and Reassembly

5.8 Left Cover

1. Before you remove the Left Cover, you should remove:

- Front Cover (Refer to the 5.4)

- Rear Cover (Refer to the 5.6)

2. Remove the one screws securing the Left Cover.

4. Unplug the Speaker Connector from the Main PBA.

Speaker

3. Apply light pressure to the back of the Left Cover and pull it to the leftt side in the direction of arrow, as shown below.

Left Cover

5. If necessary, remove the two screws securing the

Speaker and remove it.

Left Cover

Sponge

Speaker

Fixing

Bracket

Service Manual

5-7

Samsung Electronics

Disassembly and Reassembly

5.9 Scan Ass'y

1. Before you remove the Scan Ass'y, you should remove:

- Rear Cover (Refer to the 5.6)

- Right Cover (Refer to the 5.7)

- Left Cover (Refer to the 5.8)

2. Remove the two screws from the Middle Cover and remove the screw securing the Ground Cable from the Main PBA, as shown below.

4. Release the Scan Ass'y in the direction of arrow, as shown below.

Scan Ass'y

Middle

Cover

Middle

Cover

3. Unplug the three Connectors(ADF, Scan Motor,

OPE) and Film Cable-CIS, as shown below.

Film

Cable

Scan

Motor

ADF

OPE

Main PBA

5-8

Service Manual

Samsung Electronics

Disassembly and Reassembly

5.10 ADF Housing

1. Before you remove the ADF Housing, you should remove:

- Scan Ass'y (Refer to the 5.9)

2. Open the ADF Housing and insurt a flat-blade screwdriver into the slot as shown below, and remove the Cap-Hinge from the Platen Housing and ADF Housing.

4. Remove the two screws securing the ADF Ass'y and remove it. At that time, carefully release the

ADF Motor Harness from the Platen Cover, as shown below.

ADF Ass'y

ADF Motor Harness

Cap-Hinge

3. Remove the ADF Housing from the Platen

Housing. At that time, carefully release the ADF

Motor Harness from the Platen Housing, as shown below.

ADF Housing

Scan Motor

Harness

Core

1

Harness

2

5. If necessary, remove the two screws securing the

TX Stacker Ass'y and remove it, as shown below.

TX Stacker Ass'y

Platen Cover

Service Manual

5-9

Samsung Electronics

Disassembly and Reassembly

6. Open the Open Cover and remove the Open

Cover in the direction of arrow, as shown below.

Open Cover

8. Remove the two screws securing the ADF Upper and insurt a flat-blade screwdriver in to slot as shown below, and remove the ADF Upper.

2

1

2

ADF Upper

7. Pull the Bush, then rotate until it reaches the slot, as shown below. Then lift the Pick Up Unit.

1

Bush

ADF Lower

9. Unplug the Connector from the ADF PBA and remove the four screws securing the ADF Motor

Housing and remove it in the direction of arrow, as shown below.

ADF Motor Housing

2

Bearing

Pick Up Unit

5-10

Service Manual

Samsung Electronics

Disassembly and Reassembly

5.11 OPE Unit

1. Open the ADF Housing and insurt a flat-blade screwdriver into the crack as shown below, and remove the OPE Unit from the Platen Housing.

3. Remove the five screws securing the OPE PBA and remove it.

OPE PBA

ADF Housing

1

OPE

2

2. Unplug the three Connectors(Battery, OPE, Full

Sensor), as shown below.

OPE PBA

4. Release the Contact Rubbers, as shown below.

Rubber-Scroll

Rubber-Tel

OPE

Full Sensor

Battery

(NIH)

5. Release the Keys, as shown below.

Copy

Resolution

Scroll

Tel

Start

FAX

Stop

Toner Save

Scan To

OPE Cover

Service Manual

5-11

Samsung Electronics

Disassembly and Reassembly

5.12 Platen Housing

1. Before you remove the Platen Housing, you should remove:

- Scan Ass'y (Refer to the 5.9)

- ADF Housing (Refer to the 5.10)

- OPE Unit (Refer to the 5.11)

2. Remove the five screws from the Scan Upper and remove it from the Scan Lower, as shown below.

Scan Upper

4. Push the Holder in the direction of arrow and remove the Belt, as shown below. (The CIS will come out at the same time.)

CIS

Belt

3

2

1

Scan Lower

3. Take out the Battery(NIH).

Battery(NIH)

5. Release the Belt and Flat Cable from the CIS.

CIS

Belt

Core

Film Cable

5-12

Service Manual

Samsung Electronics

Disassembly and Reassembly

6. Remove the two screws securing the Scan Motor

Ass'y and remove it.

Scan Motor Ass'y

8. Using a flat-blade screwdriver remove the Full

Sensor, as shown below.

Full Sensor

7. If necessary, remove the two screws securing the

Scan Motor and remove it.

Scan Motor

Bracket

Scan Motor

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5-13

Samsung Electronics

Disassembly and Reassembly

5.13 Middle Cover

1. Before you remove the Middle Cover, you should remove:

- Scan Ass'y (Refer to the 5.9)

2. Remove the five screws securing the Middle Cover, as shown below.

4. If necessary, take out the Stacker.

Main PBA

Stacker

3. Carefully release the Middle Cover in the direction of arrow, as shown below.

Middle Cover

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Disassembly and Reassembly

5.14 HVPS

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

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

2. Remove the three screws securing the Sheet and remove it.

4. Unplug the Connector from the HVPS and remove it.

Sheet

3. Remove the three screws securing the HVPS and unplug the connector(DC Fan) from the HVPS, as shown below.

HVPS

Notice : Be awer of the Terminals(TR L) to ensure they are not lost.

DC Fan

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Samsung Electronics

Disassembly and Reassembly

5.15 Main PBA

1. Before you remove the Main PBA, you should remove:

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

2. Unplug the all Connectors from the Main PBA, as shown below.

4. Remove the four screws securing the Shield Main

PBA and remove it.

Shield Main PBA

3. Remove the four screws securing the Main PBA and remove it.

Main PBA

5. The connectors are located, as shown below.

Thermo

ADF Motor

Exit

LSU

DEBUG

Scan Motor CIS

Fan_SMPS

OPE

USB

Line

LSU

Main Motor

JTAG

Speaker

Modem

Clutch

CRUM

HVPS

(Main PBA)

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Samsung Electronics

Disassembly and Reassembly

5.16 RX Drive

1. Before you remove the RX Drive, you should remove:

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

- Main PBA (Refer to the 5.15)

2. Remove the two screws securing the Engine

Shield and remove the five screws securing the

Frame then remove the RX Drive in the direction of arrow, as shown below.

RX Drive

3. For easy disassembly, release the Feed Gear from the Frame.

Feed Gear

Notice : The five screws have numbers stamped into the RX Drive Ass'y base plate.

When refitting the Rx Drive Ass'y tighten the screws the order they are numbered.

4. If necessary, remove the two screws securing the

RX Motor and remove it.

RX Motor

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Samsung Electronics

Disassembly and Reassembly

5.17 Fuser Unit

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

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

2. Unplug the two Connectors from the SMPS and

Main PBA, as shown below.

Thermister

4. Remove the Safty Cover using a flat-blade screwdriver, as shown below.

Safty Cover

2

1

Fuser

3. Remove the four screws securing the Fuser and remove it, as shown below.

Fuser Unit

5. Remove the two screws securing the Fuser Front

Cover and remove it, as shown below.

Fuser Front Cover

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Disassembly and Reassembly

6. As shown below rotate the Holder to the direction of the arrow which is attached to the Exit Roller

F/Down and Exit Gear(DR38/25).

(The Roller_Main, Roller_FR, F/Down Holder,

Spring will come out at the same time.)

8. First remove the two screws securing the

Thermostat and then take out the Thermostat and release the CBF Harness, as shown below.

Exit Roller F/Down

Exit Gear

Holder

Roller_FR

Roller_Main

F/Down Holder

Holder Spring

Thermostat

9. Remove the screw securing the Thermistor

Harness and take out the Thermistor, as shown below.

Notice : If you don't follow the direction above the

Spring will come out forcing the Roller_Main,

Roller_FR, F/Down Holder inside the Frame

Ass'y.

7. To remove the Thermo Cap, first unlatch the hooks using a flat-blade screwdriver in the direction of arrow and then pull the Thermo Cap, as shown below.

Thermistor

2

Thermo Cap

1

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5-19

Samsung Electronics

Disassembly and Reassembly

10. First unlatch the hooks and remove the Lamp

Cover right and left, as shown below.

Lamp Cover right

1

2

12. Carefully release the Halogen Lamp in the direction of arrow.

Halogen Lamp

2

1

Lamp Cover left

11. Release the CBF Harness from the Halogen

Lamp and remove the two screws securing the

Halogen Lamp, as shown below.

CBF Harness

Fuser

13. If necessary, remove the four screws securing the

Fuser Cover and remove it.

Pressure Roller

Heat Roller

CBF Harness

Fuser Joint

Fuser Cover

Notice : Be careful not to damage or contaminate the surface of the roller when assembling and disassembling the Heat Roller.

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Disassembly and Reassembly

5.18 Engine Shield (With LIU PBA, SMPS)

1. Before you remove the Engine Shield, you should remove:

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

4. Remove the six screws securing the Engine Shield and unplug the DC Fan connector from the Main

PBA. Then carefully release the Engine Shield from the Actuator Feed Sensor Lever, as shown below.

2. Unplug the all Connectors from the SMPS and LIU

PBA.

Engine Shield

(W/LIU PBA, SMPS)

LIU

SMPS

Fuser

3. Carefully release the CRUM Harness below the bottom of the Engine Shield in the direction of arrow.

Actuator Feed Sensor Lever

5. When if only remove the SMPS, first remove the

Rear Cover(refer to the 5.6) and unplug the two

Connectors from the SMPS, as shown below.

Then remove the six screws securing the SMPS and remove it.

SMPS

CRUM

Harness

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5-21

Samsung Electronics

Disassembly and Reassembly

6. When if only remove the LIU PBA, first remove the

Rear Cover(refer to the 5.6) and then unplug the connector from the LIU PBA, as shown below.

Then remove the two screws securing the LIU PBA and remove it.

LIU PBA

5.19 LSU

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

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

2. Remove the three screws securing the LSU and remove it. Then unplug the two Connectors from the LSU.

LSU

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Disassembly and Reassembly

5.20 Paper Path Frame

1. Before you remove the Paper Path Frame, you should remove:

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

- Fuser (Refer to the 5.17)

- Engine Shield (Refer to the 5.18)

2. Remove the four screws securing the Paper Path

Frame and remove it, as shown below.

4. Unlatch the lock device of the Pick Up Gear and remove it.

Pick Up Gear

2

1

Paper Path Frame

5. To remove the Pick Up Unit, first lift the notch attached to the left side Pick Up Cam so that it's slide the left to right from the Pick Up Shaft, and then slide the Pick Up Unit right side to left side and take out the right side, as shown below.

3. To remove the Transfer Roller, first unlatch the lock device of the Holder TR from the Frame and then pull the Transfer Roller(with Holder TR) in the direction of arrow, as shown below.

1

Bush

Holder TR

2

1

Cam

3

Transfer Roller

Notice : Do not grab the rubber part of the Transfer

Roller, it may cause a malfunction due to a foreigen object. Holde the both side of the

Transfer Roller when replacing it.

Samsung Electronics

Pick Up Unit

2

Service Manual

5-23

Disassembly and Reassembly

6. To remove the Feed Roller, first unlatch the lock device of the Feed Gear and remove it. Then pull the Feed Roller from the Bush and take out the

Feed Roller(with Feed Shaft) from the Frame in the direction of arrow, as shown below.

Feed Shaft

Feed Roller

Feed Gear

3

1

2

Bush

7. Remove the screw securing the MP Solenoid and remove it, as shown below.

MP Solenoid

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Disassembly and Reassembly

5.21 CRUM Harness

1. Before you remove the CRUM Harness, you should remove:

- Scan Ass'y (Refer to the 5.9)

- Middle Cover (Refer to the 5.13)

- HVPS (Refer to the 5.14)

2. Remove the two screws securing the CRUM

Hausing and remove it.

4. Carefully release the CRUM Harness(with CRUM

PBA) below the bottom of the Engine Shield in the direction of arrow.

CRUM

Harness

CRUM Housing

3. Unplug the three connectors from the Main PBA and SMPS, as shown below.

From the Main PBA

From the SMPS

5. If necessary, remove the two screws securing the

CRUM PBA and remove it, as shown below.

CRUM Hausing

CRUM Harness

(with CRUM PBA)

Service Manual

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Samsung Electronics

]

6

6. Troubleshooting

Before attempting to repair the printer first obtain a detailed description of the problem from the customer.

Troubleshooting

Power On

OP Panel

ON?

- No Power

- Power Module error

- Main PBA error

- LCD Panel error

Indicate

Error Massage

Ready or

Power save

*Test Print printing

Quality is

Nomal?

Refer to "Solution of Image Problem"

END

* : Only Laser Printer (MFP Not Support)

Refer to

Error Massage

<Chapter 4.3>

Service Manual

6-1

Samsung Electronics

Troubleshooting

6.1.1 Basic Check List

1. Check the Power.

• Does "Warming Up" appear on the display?

--> If not check power cable, switch or SMPS.

--> Does the wall socket work?

• Do the Motors or other components initialize (listen for main motor, fan and LSU sounds)?

--> If not or there are none of the normal startup sounds check cable, switch or SMPS.

--> Does the wall socket work?

2. Check the LCD Panel.

• Is there any display at all?

--> If not check power cable, switch or SMPS.

--> Does the wall socket work?

• Is the display a meaningful message care there any broken or badly formed characters?

--> Check the main PBA and cable harness.

• Is the message on the LCD Panel a standard error message?

--> Refer to section 4.3

3. Check the Paper Path

• Is there a Paper Jam?

--> Remove any paper fragments caught in the paper path.

• Paper Jam occurs repeatedly at a specific point in the Paper Path

--> Open the fuser cover, Jam clear.

--> Dismantle the machine and carefully inspect the region where the jam occurs.

(Especially, check if paper fragments are caught in the Fuser

4. Print the Information Page (Configuration).

• Try printing a test page from a computer.

--> If there is an error check cables and driver installation.

5. Check the Print Quality.

•Is there are a Print Quality Problem?

--> Refer to section 6.5

6. Check consumables (toner etc.).

•Using the keys print the Test Pattern.

--> Expected life of various consumable parts, compare this with the figures printed and replace as required

6-2

Service Manual

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Troubleshooting

6.1.2 Initial Inspection

1. Check Power part

1. The printer does not work no matter how long you wait.

A. Is the Power Switch (printer and wall socket) turned on ?

B. Is the Power Cord connected to the printer correctly ?

C. Is the Power cord connected to the wall socket correctly ?

D. Is wall socket working ?

E. Is the unit rated at the same voltage as the supply ?

2. Does the Fan work when power is turned on?

A. Check the connectors on the SMPS.

B. Check the fuses in the SMPS.(F1)

2. Check the Installation Environment.

1. Ensure the installation surface is flat, level and free from vibration.

If necessary move the printer.

2. Ensure that the temperature and humidity of the surroundings are within specification

If necessary move the printer.

3. Ensure that the printer is position away from any air conditioning or other heating or cooling equipment. Also ensure that is not positioned in a direct draft from any air conditioning, fan or open window.

If necessary move the printer.

4. Ensure the printer is not positioned in direct sunlight.

If it is unavoidable use a curtain to shade the printer.

5. Ensure the printer is installed in a clean dust free environment.

Move the printer to clean area if necessary.

6. Some industrial or cleaning processes give of fumes which can affect the printer.

Move the printer away from this type of air pollution

3. Check paper type.

1. Use only paper which is of a suitable quality, weight and size?

See the user guide.

4. Check the overall condition of the printer

1. Is the printer properly maintained ?

Clean the Paper Transport Passages.

Any rollers with dirt surfaces should be cleaned or replaced.

Service Manual

6-3

Samsung Electronics

Troubleshooting

6.2 Bad discharge

6.2.1 Wrong Print Position

• Description

Printing begins at wrong position on the paper.

Wrong sense time caused by defective feed sensor actuator.

Check and Cause Solution

Replace the defective actuator

6.2.2 JAM 0

BIN PATH

Check and Cause

1. Check the Solenoid by using Engine Test Mode-Pick up Test.

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

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

4. If the paper feeds into the printer rand Jam 0 occurs, perform Engine Test Mode-Feed Sensor Test.

• Description

1. Paper is not exited from the cassette.

2. Jam-0 occurs if the paper feeds into the printer.

Solution

1. Replace the solenoid.

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

3. Clean with soft cloth dampened with IPA(Isopropyl

Alcohol) or water.

4. Replace the SMPS, HVPS or Sensor.

6-4

Service Manual

Samsung Electronics

Troubleshooting

6.2.3 JAM 1

BIN PATH

Check and Cause

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

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.

6.2.4 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. Replace the SMPS.

Solution

2. Reassemble the Actuator-Feed and Spring-Actuator if the returning is bad.

BIN PATH

Check and Cause

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.

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.

• 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.

Solution

1. Check if the exit sensor actuator is defective.

• Check if the actuator exit is unformed (Check if the lever part is unformed 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 matters and wire get caught in the actuator exit's operation.

2. 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.

3. 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.

Service Manual

6-5

Samsung Electronics

Troubleshooting

6.2.5 Multi-Feeding

• Description

Multiple sheets of paper are fed at once.

Check and Cause

1. Solenoid malfunction(the solenoid does not work properly): Perform Engine Test Mode-Pick up Test.

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

3. The face of paper is blended.

Solution

1. Replace the solenoid if necessary.

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

3. Use the smooth paper.

6.2.6 Paper rolled in the Fuser

• Description

If contaminated at intervals of 57mm on the back of a paper.

Check and Cause

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

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

Solution

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

2. If there is heavy background, repair it by the background troubleshooting method.

3. The surface of the heat roller with IPA or water

4. Check the warp or separation of the sprint claw and the holder plate claw, and then manage it.

6-6

Service Manual

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Troubleshooting

6.2.7 Paper rolled in the Toner Cartridge (OPC Drum)

• Description

Paper is rolled up in the OPC.

Check and Cause

1. Paper is too much thin.

2. The face of paper is curled.

Solution

1. Recommend to use normal paper.

2. How to remove the rolled in the OPC Drum.

• Remove the paper while turning the OPC

Drum against the ongoing direction.

Samsung Electronics

Service Manual

6-7

Troubleshooting

6.3 Set Malfunction – Causes and Solutions

6.3.1 LCD Display Defect ( in LCD Display)

• Description

Strange characters are displayed in the LCD Window and OPE Panel buttons do not work.

Check and Cause

1. Clear the memory.

2. Check that the OPE HARNESS is connected to the Connection Board correctly.

Solution

1. Try again after clearing the memory.

2. If re-connecting the harness does not correct the fault replace the OPE Ass’y and the main

Board in sequence.

6.3.2 Defective OPE Keypad

• Description

Pressing keys does not cause the set to respond correctly

1. Clear the memory.

Check and Cause

2. Check that there is an audible key click when a key is pressed.

Solution

1. Check that the keypad is assembled correctly and the membrane is not damaged, replace the membrane or whole keypad assembly if necessary.

2. If the fault remains replace the OPE Ass’y and the

Main board in sequence.

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Troubleshooting

6.3.3 Fuser gear melts due to overheating causing Paper Jam.

• Description

Constant Jam where paper is entering Fuser unit.

Fuser rollers do not turn

Check and Cause

1. Check the Heat Lamp, thermostat and thermistor

Solution

1. Use Engine Test Mode to test the Fuser

-THERM ADC 120.

Replace Fuser unit

Replace SMPS or Main PBA as appropriate.

6.3.4 Paper Empty

• Description

Paper Empty is displayed in the LCD panel even when paper is loaded in the cassette.

Check and Cause

1. Deformed paper sensor actuator or faulty sensor.

2. SMPS PBA or Main PBA is defective

3. Faulty cables or connectors.

Solution

1. Replace the defective actuator or sensor.

2. Replace the SMPS PBA or MAIN PBA as appropriate.

6.3.5 Paper Empty without indication

• Description

The paper empty message does not appear in the LCD when the paper cassette is empty.

Check and Cause

1. Deformed paper sensor actuator or faulty sensor.

.

2. SMPS PBA or Main PBA is defective

Solution

1. Replace the defective actuator.

2. Replace the SMPS PBA or MAIN PBA as appropriate

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Troubleshooting

6.3.6 Cover Open

• Description

The Cover Open message appears on the LCD even when the print cover is closed.

Check and Cause

1. The ‘Open Cover’ microswitch may be stuck or faulty

2. The tab on the front cover may be damaged or broken

3. Check the connector and cables between HVPS and main PBA.

Solution

1. Use TECH mode(“cover sensor test”) to check cover switch operation. Check and replace switch if necessary.

2. Replace the front cover.

3. Replace the Main Control board or HVPS as necessary.

6.3.7 No error message when the cover is open

• Description

The Cover Open message does not appears on the LCD even when the print cover is open.

Check and Cause

1. The ‘Open Cover’ microswitch may be stuck or faulty

2. Check the connector and cables between HVPS and main PBA.

Solution

1. Use TECH mode(“cover sensor test”) to check cover switch operation. Check and replace switch if necessary.

2. Replace the Main Control board or HVPS S/W as necessary.

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Troubleshooting

6.3.8 Defective motor operation

• Description

Main motor is faulty and paper does not feed into the printer, resulting in Jam 0'

Check and Cause

1. The main motor harness or Motor PCB may be faulty.

Solution

1. Check the motor harnesses and connectors, replace if defective.. If the problem persists replace the main

PBA.

Note Check motor operation using Engine Test Mode.

6.3.9 No Power

• Description

When system power is turned on the LCD panel does not come on.

Check and Cause

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

Solution

1. Replace the power supply cord or SMPS. Check power fuse and SMPS fuses replace if necessary.

2. Replace the OP panel.

2. LCD panel does not come on but normal start up sounds are heard.

3. After replacing SMPS display does not come on and no start up sounds are heard.

3. Replace the main PBA.

6.3.10 Printed Vertical Lines become curved

• Description

When printing, vertical lines are not straight.

Check and Cause

1. Check stability of 24V supply to LSU.

Solution

1. 24V stable - Replace LSU.

24V unstable replace SMPS, if the problem persists replace the main PBA.

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Troubleshooting

6.4 Bad Software Environment

6.4.1 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 and pressing

“System Data List” by pressing Menu-Reports-System

Data.

Check and Cause

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

3. Printing is not working in the Windows.

Solution

1.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).

2. Replace the printer cable. If the problems not solved even after the cable replaced, check the amount of the remaining toner.

3. 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

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

4. 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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6.4.2 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.

Check and Cause

1. Secure more space of the hard disk.

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

Solution

1. 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.

2. 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.

3. 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.

4. 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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Troubleshooting

6.4.3 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.

Check and Cause

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

Solution

1. Select SPP(Normal) or ECP LPT Port the among

ECP, EPP or SPP in the CMOS Setup.

2. Printer Driver Error.

2. 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.)

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

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6.4.4 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).

Check and Cause

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

Solution

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

2. If the previous printing error not solved.

3. When expected to collide with other program.

2. If there are some files with the extension name of

****.jnl, Delete them and Reboot the Windows to restart printing job.

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

4. Delete the printer driver completely and reinstall it.

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

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

5 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.

6. 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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Troubleshooting

6.5 Bad image

6.5.1 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

Check and Cause

1. Damaged develop roller in the Developer.

Deformed Doctor-blade or cleaningblade.

Solution

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

2. Scratched surface of the discharge roller in the developer.

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

2. Replace the transfer roller if occurred as

No. 3.

6.5.2 Vertical White Line

• Description

White vertical voids in the image.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

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

Solution

1. 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 in the LSU : Open the cover of LSU and clean with a cotton swab on the surface of the reflex mirror.

2. Foreign matter or toner particles between the developer roller and blade.

(In case the life of the developer has been expired, white lines or light image occur in front of the image.)

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

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

3. No 3. : Remove the foreign matter and burr of the exposure window.

(Developer cartridge)

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

5. If the problems are not solved, replace the developer cartridge.

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Troubleshooting

6.5.3 Horizontal Black Band

• Description

1. 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 developer.

Check and Cause Solution

1. Clean each voltage terminal of the Charge,

Supply, Develop and Transfer roller.

(remove the toner particles and paper particles)

2. Clean the right Gear that has relatively small gap of the teeth in the OPC.

2. The rollers of developer may be stained.

OPC Drum = 75.5mm

Charge Roller = 37.7mm

Supply Roller = 47.5mm

Develop Roller = 35.2mm

Transfer Roller = 46.2mm

Heat Roller = 63.9mm

Pressure Roller = 75.4mm

3. If the malfunction persists, replace the developer.

6.5.4 Black/White Spot

• Description

1. Dark or blurry black spots occur periodically in the printing.

2. White spots occur periodically in the printing.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

1. If dark or blurry black spots occur periodically, the rollers in the Developer may be contaminated with foreign matte or paper particles.

( Charge roller : 37.7 mm interval

OPC drum : 75.5 mm interval)

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

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

Solution

1. Run OPC cleaning Mode Print and run the

Self-test 2 or 3 times.

2. 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.

sheets printing. If the roller's life is expired, replace it.

4. In case of 37.7 mm interval unremovable in

1, take measures as to replace the developer cartridge and try to print out.

5. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble.

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Troubleshooting

6.5.5 Light Image

• Description

The printed image is light, with no ghost.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

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

2. Ambient temperature is below than 10°C.

3. Bad contact caused by the toner stains between the high voltage terminal in the

HVPS and the one in the set.

4. Abnormal output from the HVPS.

Solution

1. Check if the Toner Save mode is off.

2. Replace the developer cartridge and try to print out.

3. Wait 30 minutes after printer is powered on before you start printing.

4. Clean up the contaminated area by the toner.

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

6.5.6 Dark Image or a Black

• Description

The printed image is dark.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

1. No charge voltage in the engine board.

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

Solution

1. Clean the high voltage charge terminal.

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

3. Replace the HVPS if not solved by the above direction 1 and 2.

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Troubleshooting

6.5.7 Uneven Density

• Description

Print density is uneven between left and right.

Check and Cause

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.

2. The toner level is not even on the developer roller due to the bad blade.

Solution

1. Replace both the left and right Spring

Holder.

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

6.5.8 Background

• Description

Light dark background appears in whole area of the printing.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

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

2. Does recycle paper be used?

3. Has the life span of the developer ended?

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

5. Is the HVPS normal?

Solution

1. The toner cartridge is basically designed to print 3,000 sheets with

5% image.

2. The B/S is not guaranteed if using recycle paper.

3. Replace the developer when the life span of it has been ended.

4. Clean the bushing part of the transfer roller.

5. If the problem is still not solved, replace the developer.

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Troubleshooting

6.5.9 Ghost (1)

• Description

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

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

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

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

3. The life of developer is expired.

Solution

1. Clean the terminals when contaminated by toner particles.

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

3. Replace the Main board and HVPS Board if not solved by the above directions 1-2.

4. Transfer roller lifetime(50.000 sheets) has expired.

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

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

5. Wait about 1 hour after power on before using printer.

6.5.10 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)

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

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

Solution

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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Troubleshooting

6.5.11 Ghost (3)

• Description

White ghost occurs in the black image printing at 47.5mm intervals.

Check and Cause

1. The life of the developer may be expired.

2. The abnormal voltage and bad contact of the terminal of the supply roller

Solution

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

2. Check the approved voltage of the supply roller and contact of the terminal and adjust if necessary.

6.5.12 Ghost (4)

• Description

Ghost occurs at 47.5mm(or 63.9mm) intervals.

Check and Cause

The temperature of the fuser is maintained high.

Solution

1. 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)

6.5.13 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

Check and Cause

1. Toner leakage due to improperly sealed developer.

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

Solution

1. Replace the developer cartridge.

2. If the transfer roller is contaminated, run

DRUM Cleaning Mode Print 2 or 3 times.

And perform Self-Test 2 or 3 times to remove contamination.

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Troubleshooting

6.5.14 Stains on Back of Page

• Description

The back of the page is stained at 47 mm intervals.

Check and Cause

1. Transfer roller is contaminated.

Digital

Digital Pri

Digital Printer

Digital Printer

Digital Printer

2. Pressure roller is contaminated.

Solution

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

2. Replace the transfer roller if contaminated severely.

3. 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.

6.5.15 Blank Page Print out (1)

• Description

Blank page is printed.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause

Bad ground contacts in OPC and/or developer.

Solution

Remove contamination of the terminals of the developer and the unit.

6.5.16 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.

Check and Cause

1. Bad ground contacts in OPC and/or developer.

2. Abnormal solenoid.

Solution

1. Remove contamination of the terminals of the developer.

2. Perform the engine self test using Engine Test

Mode to check if the Solenoid is normal.(refer to code 06)

3. If not solved by the above directions 1-2,

Replace the engine board.

4. Turn the power off, delete the data of PC and try printing again.

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Troubleshooting

6.6 Fax & Phone Problems

6.6.1 No Dial Tone

• Description

There is no dial tone when the On-Hook dial button is pressed.

Check and Cause

1. Check that the telephone line cord supplied with the set is connected to TEL LINE correctly.

2. Listen for a CLICK sound when the OHD key is pressed.

3. Check the connection of the HARNESS between the LIU and the Main B'd.

4. Check that the SPEAKER is connected correctly.

Solution

1. If the telephone cord is OK but there is no dial tone, try plugging a normal telephone into the wall socket. If this is OK then replace the LIU B'd.

2. If you cannot hear the OHD CLICK sound, the OPE

Ass'y may be defective. Replace the OPE Ass'y.

(If the key click sound if off, you cannot hear click sound even if OPE Ass’y has no problem on it)

3. Check the Speaker connection and the harness between the LIU and the Main PBA, replace as necessary.

4. Use Tech mode / Modem Test to check that the speaker and amplifier are working. Replace the Main B'd.

6.6.2 Defective MF DIAL

• Description

The MF DIAL is not functioning.

Check and Cause

1. Check that the telephone line cord supplied with the set is connected to TEL LINE correctly.

2. Listen for a CLICK sound when the KEY is pressed.

3. Check the connection of the HARNESS between the LIU and the Main B'd.

4. Check that the SPEAKER is connected correctly.

Solution

1. If the telephone cord is OK but there is no dial tone, try plugging a normal telephone into the wall socket. If this is OK then replace the LIU B'd.

2. If you cannot hear the OHD CLICK sound, the OPE

Ass'y may be defective. Replace the OPE Ass'y.

(After key click sound sets to “ON”, and you can hear click sound)

3. Check the Speaker connection and the harness between the LIU and the Main PBA, replace as necessary.

4. Use Tech mode / Modem Test to check that the speaker and amplifier are working. Replace the LIU and Main B'd in sequence

Notes: Product supports MF DIAL type only.

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Troubleshooting

6.6.3 Defective FAX FORWARD/RECEIVE

• Description

FAX FORWARD/RECEIVE is not functioning.

Check and Cause

1. Check that you can hear a dial tone by pressing

OHD.

2. Check that you can hear a RECEIVE tone when

MODEM testing in TECH Mode.

Solution

1. If MODEM testing is normal and there is no dial tone, then try replacing the LIU B'd.

2. If testing the MODEM shows a fault replace the

Main B'd.

6.6.4 Defective FAX FORWARD

• Description

RECEIVE is functioning, but FORWARD is not functioning or received data is corrupt.

Check and Cause

1. Check if there is a NOISE line by pressing on-hook dial and listening.

2. Check that the destination fax machine can receive forwarded faxes by using a different sending fax machine (preferably from the same wall socket).

3. Check the cable between the set and the wall socket for damage.

Solution

1. If you can hear a noisy line when using on-hook dial, replace or repair the telephone line

2. Replace LIU.

3. Replace the line cord.

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Troubleshooting

6.6.5 Defective FAX RECEIVE (1)

• Description

FORWARD is functioning, but RECEIVE is not functioning or the received data is corrupt.

Check and Cause

1. Check if there is a NOISE line by pressing on-hook dial and listening

2. Use a different fax machine to receive from the same sender (if possible on the same wall socket).

Solution

1. If you can hear a noisy line when using on-hook dial, replace or repair the telephone line.

2. Replace the LIU.

6.6.6 Defective FAX RECEIVE (2)

• Description

Received data are lengthened or cut in the printing.

Check and Cause

1. Check if there is a NOISE line by pressing on-hook dial and listening

2. Ask sender to send to another fax machine

(if possible connected to the same wall socket)

Solution

1. If you can hear a noisy line when using on-hook dial, replace or repair the telephone line

2. Replace LIU or main PBA in sequence.

6.6.7 Defective FAX RECEIVE (3)

• Description

The phone is ringing continuously, but it set does not answer the call.

Check and Cause

Check that the RECEIVE Mode is set to FAX MODE.

Solution

If the fault persists even when the RECEIVE Mode is changed to FAX MODE then replace the LIU and the

Main B'd in sequence.

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Troubleshooting

6.6.8 Defective FAX RECEIVE (4)

• Description

Received data is reduced by more than 50% in the printing.

Check and Cause

Check the FAX status of the forwarding side.

Solution

This is a problem with the sending fax machine.

Correct the setting on the remote machine..

6.6.9 Defective Automatic Receiving

• Description

The automatic receiving function is not working.

Check and Cause

1. Check that the RECEIVE Mode is set to FAX

MODE.

Solution

1. If the RECEIVE Mode is set to the TEL MODE, reset it to the FAX MODE.

2. Even after the RECEIVE Mode is changed to the FAX

Mode, the problem persists then try to replace the LIU and the Main B'd in sequence.

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6.7 Copy Problems

6.7.1 White Copy

• Description

Blank page is printed out when copying.

Check and Cause

1. Check the Scanner Cover is properly closed.

2. Check shading profile.

3. Check white/black reference voltage on Main PBA.

Solution

1. Room light can pass through a thin original.

2. Redo shading profile in the tech mode.

3. Replace the Main PBA.

6.7.2 Black Copy

• Description

Black page is printed out when Copying.

Check and Cause

1. Check for CIS problem on the Main PBA.

2. Check shading profile.

Solution

1. Check the CIS FFC Cable is properly connected.

2. Redo shading profile in the tech mode.

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Troubleshooting

6.7.3 Abnormal noise

• Description

There is noise from the ADF when copying.

Check and Cause

1. Check the Scanner Motor, gearbox and rollers.

2. Check the Motor Driver on Driver PBA.

Solution

1. Check for correct assembly of gears and motor.

Ensure no parts are fouling and there are no foreign objects in the mechanism or scanner path. Replace any worn parts

2. Replace the main PBA and ADF PBA in seguence.

6.7.4 Defective Image Quality

• Description

The copied image is excessively light or dark

Check and Cause

1. Check shading profile.

2. Check the gap between original and scanner glass.

3. Check printing quality.

Solution

1. Redo shading profile in the tech mode.

2. A gap of more than 0.5 mm can cause a blurred image. Ensure rollers and cover close correctly.

Replace as necessary.

3. See "Print" troubleshooting.

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6.8 Scanning Problems – Causes and Solutions

6.8.1 PC Scanning problems

• Description

Unable to scan using a PC.

Check and Cause

1. Check the Cable (USB or Parallel) is properly connected and that the printer can print correctly.

2. Check that the driver is installed properly.

3. Check that the copy function operates normally.

Solution

1. Reconnect the PC and printer, replace any faulty cables. If using a parallel cable, check that the parallel port is properly configured in the BIOS.

2. If printing is OK check that the Scan driver is also installed (Refer to User's Manual.)

3. If the copy function works, replace the Main PBA.

If the copy function doesn't work, replace the CIS

Ass'y and try again.

6.8.2 Poor Quality of PC Scanned images

• Description

The image PC scanned is not clear or bad.

Check and Cause

1. Use TECH mode to carry out a shading test and examine the waveform printout.

2. Check if the resolution is set too low in PC Scan options. (Refer to User's Manual.)

Solution

1. If the CIS waveform form is abnormal replace the

CIS Ass'y.

2. Teach the user about scanner resolution – refer to the User Guide.

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Troubleshooting

6.9 Toner Cartridge Service

Only toner cartridges supplied by Samsung should be used. Printing defects or set damage caused by the use of non-approved toner cartridges or un-licensed toner refills are not covered by the guarantee.

6.9.1 Precautions on Safe-keeping of Toner Cartridge

Excessive exposure to direct light for more than a few minutes may cause damage to the cartridge.

6.9.2 Service for the Life of Toner Cartridge

If the printed image is light due to the toner supply becoming low 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 permanently.

6.9.2.1 Redistributing Toner

When the toner cartridge is near the end of its life, white streaks or light print occurs. The LCD displays the warning message, “Toner Low.” You can temporarily reestablish the print quality by redistributing the remaining toner in the cartridge.

6.9.3 Standard of guarantee for consumable parts.

Please refer to User's Manual or Instructions on Fax/Printer Consumables SVC manual for the criteria for judging the quality of consumable parts the standard of guarantee on those parts.

• Spotting a refilled cartridge by eye.

One way security screws are used in the manufacture of the cartridge – check if these are damaged.

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Troubleshooting

6.9.4 Error messages in the LCD window related to toner.

This section explains messages on the LCD that are related to the data stored in the EEPROM in the toner cartridge.

6.9.4.1 Toner Low

- Explanation: The amount of toner remaining is less than 10%

- Solution: The cartridge is almost empty or life-expired – replace the cartridge.

6.9.4.2 Toner Empty

- Explanation: The toner cartridge is empty

- Solution: Replace the cartridge.

6.9.4.3 Drum Warning

- Explanation: This message appears when the OPC drum is nearing the end of its life (14,000pages). This means that the life of the mechanical parts in the cartridge has expired (this is not an indication of toner remaining).

- Solution: After printing about 15,000 pages, in a worst case scenario, the waste toner collector might overflow and it may cause the system to fail. Also after 15,000 pages the OPC drum surface will be becoming worn and print quality will degrade, print images will become misty. It is therefore necessary to replace the cartridge even though there may be toner left in it.

When this message occurs there are approximately 1,000 pages left.

6.9.4.4 Replace Drum

- Explanation: The toner cartridge mechanical life is expired.

- Solution: Replace the cartridge.

Service Manual

6-31

Samsung Electronics

Troubleshooting

6.10 Software Problems – Causes and Solutions

6.10.1 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: using the menu buttons print the test page.

Check and Cause

2. Check that the PC and the printer are properly connected and that the toner cartridge installed correctly.

3. Printing is not working in the Windows.

4. Check that the printer cable is directly connected to the printer.

Solution

1. If the test print works that means there are no problems in the printer itself. If the test printing does not work that means the printer is faulty and the problem is not due to computer software or driver settings.

2. Replace the printer cable. If the problem is not solved even after the cable is replaced, check the amount of the remaining toner. (refer to Toner

Cartridge Service 7-6, Page 7-25)

3. Check that the connection between PC and printer port are correcct. If you use windows, check that the printer driver in the controller is set up correctly set up, the correct port is selected and ‘Use On-line’ is selected in the driver. If the printer driver is properly set up try printing a test page from the driver properties. Check in which program printing is not working.

Try opening ‘Note Pad’ and printing. If the printer is not working in a certain program, adjust the setup within that program.

Sometimes, the printout is normal within the

Windows basic programs, but it's not working in a particular program. In this case, uninstall and reinstall the new driver. If the printer is not working in the Windows basic programs and you are printing using the parallel port check the port setting in

CMOS is on ECP and that the address is IRQ 7 and 378 (for parallel port 1). Try using USB instead of parallel – or vice versa.

4. If you have other devices that need to share the printer port try temporarily disconnecting these devices and perhaps even uninstalling their drivers) to ensure the printer works by itself. If you are using a USB hub try connecting directly to the back of the

PC instead.

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Troubleshooting

6.10.2 The printer is not working (2)

• Description

After receiving the print command there is no response at all or print speed is low due to wrong setup of the environment rather than malfunction of the printer itself.

Check and Cause

1. Ensure you have sufficient free hard disk space for the temporary work files created during printing.

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

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

Setup.

4. Reboot the system to print.

Solution

1. Not working with the message 'insufficient printer memory' means there is a hard disk space problem rather than a printer RAM problem. In this case provide more space on the hard disk. Secure more space using the disk utilities program.

2. The connection of the cable and printer port is not correct. Check that the cable is properly connected and if you are using the parallel port check that the port settings in CMOS is correct.

3. For the printer port, Select ECP. SPP and normal normal modes support 8-bit data transfer, while

ECP Mode supports 12-bit data transfer.

4. 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.

Samsung Electronics

Service Manual

6-33

Troubleshooting

6.10.3 Abnormal Printing

• Description

Printing does not work – even after replacing the cable

Printer does not work at all or strange fonts are printed,

Check and Cause

1. Set up the parallel port using CMOS SETUP.

2. Printer Driver Error.

3. Error message “insufficient memory”.

(The printing job sometimes stops due to insufficient virtual memory, this is caused by insufficient space on the hard disk.)

Solution

1. Ensure that ECP (best) or SPP is selected in the

CMOS (BIOS) setup.

2. Ensure that the correct driver is loaded. Use the driver supplied on the CD or downloaded from the

Samsung web site. DO NOT use the Microsoft driver supplied with the Windows operating system.

If the printer is a GDI or SPL type printer ensure that

ALL OTHER GDI or SPL drivers are uninstalled as

Windows allows only 1 of this type of driver to be loaded.

3. Delete any unnecessary files to secure enough space on the hard disk and start the print job again.

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Troubleshooting

6.10.4 SPOOL Error

• Description

SPOOL (simultaneous peripheral operations online) is the process Windows uses to manage print jobs. Jobs are processed and then stored on the hard disk until the printer is ready to accept them

Check and Cause

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

2. If previous printing errors were not solved.

3. There may be conflict with other drivers or programs.

Solution

1. Delete any unnecessary files to provide more space for spool storage.

2. There may be files from previous failed print jobs on the hard disk with the name in the form ‘*.jnl’.

Delete these files and Reboot Windows to restart the printer.

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

4. Delete the printer driver completely and reinstall it.

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

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

6. Memory is less than suggested.

5 After rebooting the computer, check for viruses, restore the damaged files and reinstall the application program which is not working properly.

6. Add up more 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 delete in the menu.

If the job you are deleting is the current job when you delete the job data that has already been transferred to the printer’s memory will still be printed. If there is a problem with the printer (out of toner, offline, out of paper etc.) the job may take a long time to delete as it must wait for a time out.

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6-35

Samsung Electronics

Troubleshooting

6.11 Windows Problems

Problem Solution

After installing PortThru the print server name is not displayed under New Print Server in

SyncThru.

The print server name is displayed, but the test page is not printed.

1. Verify that the printer power switch is turned on and the 'READY' message is displayed on the printer front panel.

2. Verify that the LAN cable is plugged into the PortThru card.

3. There are 2LEDs on the PortThru card. One should flash irregularly and the other should be on. If this is not the case ensure that the network card is properly installed and the PCB an cable connectors make a good connection. If the problem continues check the network cable / socket by using a different cable or socket. If the problem continues replace the network card.

4. Confirm that the print server and the PC which searches for the

New Print Server is on the same LAN (correct IP and subnet mask settings). If you want to search for a New Print Server your

PC and the print server should be on the same LAN.

Using the front panel menus print the Network configuration. If the

Network menu is not displayed or the configuration page is not printed turn off the printer, ensure the network card is properly fitted then turn it back on and try again. If the problem continues replace the network card.

SyncThru indicates that firmware upgrade is complete but when the network configuration is printed the software version has not changed.

Before attempting to upgrade firmware ensure that computer and printer can communicate using a Ping command.

SycThru is unable to automatically detect the printer.

The printer does not print via a network connection.

1. Check that the LAN cable is connected to the printers. If an IP address is assigned to the computer and printer ensure that the

Ping command can see the printer.

If an IP address is not allocated to the printer or it is in a different

LAN segment then ensure that either IPX/SPX or DLC/LLC protocols are enabled on the computer.

2. Print the network configuration. If the TCP/IP or Network protocols are disabled in the printer either use the front panel to reenable them or ensure that DLC/LLC protocol is installed in the computer.

3. In SyncThru use the Settings / Protocol Selection menu option to select either TCP/IP or IPX protocols and then use the

View/Refresh option to scan the network again.

4. Ensure that the network cable and wall socket are functioning correctly.

5. Ensure that the version of SyncThru is the same as or newer than the version supplied with the printer.

6. Ensure that there is no router between the printer and the computer as SyncThru will not work through a router.

7. Ensure there are no Switch or Router VLAN or Access Control

Lists which are blocking communication between the printer and the computer.

Note Windows XP does not support DLC/LLC protocols.

1. Connect the printer using a Parallel or USB cable and ensure that the computer can print. If not check that the printer drivers are installed correctly

2. If the printer can print via a local connection check Printer

Properties / Ports and ensure that a TCP/Ip port has been allocated to the printer.

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Troubleshooting

6.12 SyncThru Installation Problems

Problem Solution

"File Transfer Error" message appears during the Installation process.

1. Make sure that any previously installed version of SyncThru is uninstalled. Restart your PC after uninstalling previous versions.

2. If the problem continues, In Windows 95/98 boot into MS/DOS mode and delete the "sammon.dll" file in the windows\system directory the restart Windows and reinstall SyncThru. In Windows

NT stop the spooler service using' Services 'in Control Panel, delete the "sammon.dll" file in the windows\system32 directory then restart the spooler service and reinstall SyncThru.

'Unable to add the Port list of Samsung ports' message appears when you add a port.

Verify that your PC restarts after installing SyncThru.

Samsung Electronics

Service Manual

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7

7. Exploded Views and Parts List

Contents

7.1 Main

7.2 Cover Housing

7.3 Front Cover

7.4 Rear Cover

7.5 Frame Ass'y

7.6 ADF Ass'y

7.7 Platen Cover Ass'y

7.8 Platen Ass'y

7.9 OPE Unit

7.10 RX Drive Unit

7.11 MP Tray

7.12 Fuser Unit

7.13 Paper Path Ass'y

7.14 Pick Up Unit

Exploded Views & Parts List

7-10

7-11

7-12

7-13

7-14

7-15

7-6

7-7

7-8

7-9

7-2

7-3

7-4

7-5

Samsung Electronics

Service Manual

7-1

Exploded Views & Parts List

7.1 Main

7-2

Service Manual

Samsung Electronics

7.2 Cover Housing

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-3

Exploded Views & Parts List

7.3 Front Cover

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1

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Service Manual

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5

6

2

Samsung Electronics

7.4 Rear Cover

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3

7

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5

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Exploded Views & Parts List

Service Manual

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Samsung Electronics

Exploded Views & Parts List

7.5 Frame Ass'y

7-6

Service Manual

Samsung Electronics

7.6 ADF Ass'y

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-7

Exploded Views & Parts List

7.7 Platen Cover Ass'y

0

7-8

Service Manual

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12

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12

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Samsung Electronics

7.8 Platen Ass'y

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-9

Exploded Views & Parts List

7.9 OPE Unit

0

14

7-10

Service Manual

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13

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Samsung Electronics

7.10 RX Drive Unit

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-11

Exploded Views & Parts List

7.11 MP Tray

0

2

1

7-12

Service Manual

4

5

3

Samsung Electronics

7.12 Fuser Unit

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-13

Exploded Views & Parts List

7.13 Paper Path Ass'y

7-14

Service Manual

Samsung Electronics

7.14 Pick UP Unit

Exploded Views & Parts List

Samsung Electronics

Service Manual

7-15

΁ΒΣΥΤ͑ͽΚΤΥ

Service Parts List(Model: SCX-4725FN/XAZ)

Drawer#

7.1-0

7.1-1

7.1-2

7.1-3

7.1-4

7.1-5

7.1-6

7.1-7

7.1-8

7.1-25

7.1-26

7.1-26-1

7.1-27

7.1-28

7.1-29

7.2-0

7.2-1

7.2-2

7.2-2-1

7.2-2-2

7.2-2-3

7.2-2-4

7.2-3

7.2-4

7.2-5

7.2-5-1

7.2-5-2

7.2-5-3

7.3-0

7.3-1

7.3-2

7.3-3

7.3-4

7.1-9

7.1-10

7.1-11

7.1-12

7.1-13

7.1-14

7.1-15

7.1-16

7.1-16-1

7.1-16-2

7.1-18

7.1-19

7.1-20

7.1-21

7.1-23

7.1-24

SEC_Code

Service(SA:service available,SNA:service not available)

Description

3903-000020

JG61-40001A

JC96-04216A

JC97-02784A

JC96-04220A

JC63-01176A

3001-001494

GB70-10500A

JC72-01382A

JC63-01177A

JC96-04219A

JC97-02785A

JC63-01180A

JC72-01351C

JC63-01250A

JC97-02784A

JC63-01179A

JC63-01188A

JC63-00628D

JC63-01112A

SCX-4725FN/XAZ SET

JC96-04230A

JC96-04065A

ELA HOU-FRAME_LOWER

ELA UNIT-LSU

JC39-00642A

JC96-03352V

HARNESS-LSU

ELA UNIT-DEVE INITIAL

JC96-04229A

JC63-01190A

JC63-00631A

JC44-00133A

ELA HOU-FUSER

SHIELD-ENGINE

GROUND-P-HVPS

SMPS-V1

JC92-01793B

JC39-00641A

6103-000117

6502-000132

6502-000132

3103-001085

JC39-00228A

JC96-01672A

JC70-40912A

JC61-00031A

JC44-00132A

JC63-00722A

JC63-01191A

JC92-01855A

JC39-00644A

JC96-04216A

JC97-02239C

JC96-04237Q

JC67-00087A

JC63-01204A

PBA SUB-LIU

HARNESS-LIU

SUPPORTER

CABLE CLAMP

CABLE CLAMP

FAN-DC

CBF HARNESS-GND

ELA UNIT-TERMINAL TR L

ICT-SHAFT HV LARGE

SPRING ETC--HV LARGE

HVPS

SHEET-HVPS

SHIELD-PBA

PBA-MAIN

HARNESS-SENSOR_JOINT

ELA HOU-COVER

MEA UNIT-MP TRAY

ELA HOU-SCAN

CAP-M-HINGE

COVER-PAPER

CBF-POWER CORD

FOOT-SF4000

ELA HOU-COVER

MEA-COVER_FRONT

ELA HOU-COVER SIDE L

COVER-SIDE_L

SPEAKER

IPR-UNIT FIXING BRAC

SPONGE-COVER SIDE L

COVER-SIDE_R

ELA HOU-COVER REAR

MEA-COVER_MIDDLE

COVER-MIDDLE

PMO-STACKER

SHEET-FAN

MEA-COVER_FRONT

COVER-FRONT

TRAY-CASSETTE_LOWER

TRAY-EXTENSION_L

TRAY-M_EXTENSION S

QT'y Service

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

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1

1

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3

1

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2

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1

1

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1

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SA

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SNA

SA

SA

SNA

SA

SA

SNA

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SA

SNA

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SA

SA

SNA

SA

SNA

SA

SNA

SNA

SNA

SNA

SA

SA

SA

SA

SA

SNA

SA

SA

SNA

SA

SA

SNA

SA

SA

SA

SNA

SA

SA

SA

SNA

SA

SNA

SNA

SA

͢

Drawer#

7.5-19

7.5-20

7.5-20

7.5-21

7.5-22

7.6-0

7.6-1

7.6-1-1

7.6-1-2

7.6-1-2-1

7.6-1-2-2

7.5-8

7.5-9

7.5-10

7.5-11

7.5-12

7.5-13

7.5-13-1

7.5-14

7.5-15

7.5-16

7.5-18

7.4-7

7.5-0

7.5-1

7.5-2

7.5-2-1

7.5-2-2

7.5-2-3

7.5-3

7.5-5

7.5-6

7.5-7

7.3-5

7.3-6

7.4-0

7.4-1

7.4-2

7.4-3

7.4-4

7.4-5

7.4-6

7.6-1-2-3

7.6-1-2-4

7.6-1-2-5

7.6-1-2-6

7.6-1-2-7

7.6-1-2-8

7.6-1-2-9

7.6-1-3

7.6-1-4

7.6-1-5

7.6-1-6

7.6-1-7

7.6-1-8

7.6-1-9

΁ΒΣΥΤ͑ͽΚΤΥ

SEC_Code

JG66-40003A

JC61-00836A

JC61-01258A

JC61-01259A

JC31-00027A

JC96-03797A

JC92-01763A

JC63-00622A

JC66-01257A

JB61-00076A

JC66-00813A

JC66-01218A

JC39-00480A

JC72-41142A

JC61-00047A

JC72-41145D

JC96-04232A

JC96-04233A

JC63-00656C

JC96-03379A

JC66-00458A

JC66-00322A

JC63-01203A

JC63-01189A

JC96-04219A

JC63-01178A

JC63-01192A

JC92-01858A

JC67-00202A

JC63-01194A

JC66-01304A

JB61-00107A

JC96-04230A

JC61-01703A

JC97-02670A

JC61-01709A

JC66-00720A

JC74-00011A

6107-001163

JC66-00808A

JC70-00527A

JC70-00528A

JC66-00457A

JC66-00455A

JC66-00456A

JC61-01180A

JC31-00036A

JC66-00556A

JC61-01178A

JC92-01845A

JC63-00667A

JC39-00407A

JC66-00560A

JB72-00819A

JC66-00460A

6044-000159

Service(SA:service available,SNA:service not available)

Description QT'y Service

TRAY-CASSETTE_R

TRAY-CASSETTE _L

ELA HOU-COVER REAR

COVER-REAR

COVER-JAM

PBA SUB-SENSOR

CAP-JAM

COVER-FUSER_REAR

ACTUATOR-EXIT

SPRING ETC-LEVER SENSOR

ELA HOU-FRAME_LOWER

FRAME-M_BASE

MEA UNIT-KNOCK_UP

PLATE-KNOCK_UP

SHAFT-P-CORE

MPR-PAD KNOCK UP MP

SPRING-CS

GEAR-FEED DR 41

ADJUST-CASSETTE_L

ADJUST-CASSETTE_R

GEAR-PINION

FOOT-FRONT

SPRING ETC-TORSION DEVE_L

SPRING ETC-TORSION DEVE_R

FAN-DC_HUMMINGBIRD

ELA HOU-CRUM

PBA SUB-CRUM_P

GROUND-P-OPC

ACTUATOR-EMPTY

SPRING ETC-TORSION DOC (CC2-F)

GEAR-TRANSFER

ROLLER-TRANSFER

CBF HARNESS-MAINMOTOR

PMO-BUSHING TR

SPRING ETC-TR L HAWK

PMO-TRANSFER HOLDER L

ELA HOU-ADF

ELA HOU-ADF LOWER

COVER-ADF LOWER

ELA HOU-ADF MOTOR

GEAR-IDLE 35 ADF

GEAR-CLUTCH 39

GEAR-SWING 31/20 ADF

GEAR-58/25 ADF

GEAR-40/21 ADF

BRACKET-P-MOTOR

MOTOR STEP-ADF

IMPELLER-ADF

BRACKET-M-GEAR

PBA SUB-ADF

GROUND-P-ADF

CBF HARNESS-ADF

ROLLER-DRIVE

PMO-BUSH

SHAFT-M-FEED GEAR 38

RING-C

1

1

1

1

1

1

1

3

1

1

1

1

1

1

1

2

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

4

1

1

1

1

1

SA

SA

SNA

SA

SNA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SNA

SA

SNA

SNA

SA

SNA

SNA

SNA

SA

SA

SA

SA

SA

SA

ͣ

Drawer#

7.7-8

7.7-9

7.7-10

7.7-11

7.7-12

7.7-13

7.8-0

7.8.1

7.8-1-1

7.8-1-2

7.8-1-2-1

7.6-3-2

7.6-3-3

7.6-3-4

7.7-0

7.7-1

7.7-2

7.7-3

7.7-4

7.7-5

7.7-6

7.7-7

7.8-1-2-2

7.8-1-2-3

7.8-1-2-4

7.8-1-2-5

7.8-1-2-6

7.8-1-2-7

7.8-1-3

7.8-1-4

7.8-1-5

7.8-1-6

7.8-1-7

7.8-1-8

7.8-1-9

7.8-1-11

7.6-1-10

7.6-1-11

7.6-1-12

7.6-1-13

7.6-1-14

7.6-1-15

7.6-1-16

7.6-1-17

7.6-1-18

7.6-2

7.6-2-1

7.6-2-2

7.6-2-2-1

7.6-2-2-2

7.6-2-2-3

7.6-2-2-4

7.6-2-3

7.6-2-4

7.6-3

7.6-3-1

΁ΒΣΥΤ͑ͽΚΤΥ

SEC_Code

JC97-02203A

JB72-00819A

JB72-00843A

JC97-02802A

JC63-00659C

JC63-00209A

JB72-01166D

JC61-00833C

JC61-00834C

JF70-10616A

JG66-40003A

JC61-00011A

JF70-40521B

JG72-40663A

JC66-00909A

JC73-00091A

JC97-02803A

JC96-04235A

JC96-04236A

JC63-00660B

JC96-02655A

JC61-00698A

JC72-01011A

6107-001163

JC75-00095A

JB61-00076A

JC61-01179A

JC72-01009A

JB66-00101A

JC72-01010A

JC66-00559A

JC97-02804A

JC63-00657C

JC97-01709A

JC61-00694A

JC63-00243A

JB73-00052A

JC61-00387A

JC61-00712A

JC66-00594A

JC97-02801A

JC63-00658C

JB31-00011A

JB66-00082A

JB72-01136A

6044-000125

JB66-00083A

JB66-00084A

0609-001223

JC39-00408A

JC66-00838A

JB72-01136A

JB72-01136A

JB72-00763A

JB61-00109A

JB96-01381A

Service(SA:service available,SNA:service not available)

Description QT'y Service

PMO-ACTUATOR SCAN SENSOR

SPRING-CS

MEC-BRUSH ANTISTATIC

SPRING ETC-TORSION DOC (CC2-F)

PLATE-M_WHITE BAR

PMO-ACTUATOR DOC SENSOR

GEAR-CLUTCH 29

PMO-ACTUATOR REGI SENSOR

ROLLER-EXIT

MEA UNIT-ADF UPPER

COVER-ADF UPPER

MEA UNIT-HOLDER ADF

HOLDER-M-ADF

SHEET-ADF HOLDER

RMO-ADF RUBBER

SPRING ETC-PAD

GUIDE-STACKER SUB

SHAFT-STACKER

MEA UNIT-COVER OPEN

COVER-ADF OPEN

MEA UNIT-PICKUP

PMO-BUSH

PMO-GUIDE PAPER

MEA UNIT-COVER PLATEN

COVER-PLATEN

SHEET-WHITE SPONGE

PMO-TX STACKER

GUIDE-DOC_R

GUIDE-DOC_L

IPR-WASHER SPRING CU

GEAR-PINION

SPRING ETC-FEED

ICT-SHAFT PINCH

PMO-ROLL PINCH

SHAFT-IDLE FEED

RPR-ROLLER EXIT IDLE

MEA UNIT-TX STACKER

ELA HOU-PLATEN

ELA HOU-SCAN LOWER

COVER-SCAN LOWER

ELA HOU-SCAN MOTOR

BRACKET-M-SCAN MOTOR

MOTOR STEP-SCAN

GEAR-TIMING

PMO-HOLDER BELT

RING-E

GEAR-IDLE

GEAR-REDUCTION

CONTACT IMAGE SENSOR

CBF SIGNAL-CIS FFC

SHAFT-CIS

PMO-HOLDER BELT

PMO-HOLDER BELT

PMO-PULLEY

SPRING ETC-BELT

ELA UNIT-CORE

2

2

2

6

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

2

1

1

1

1

1

1

1

1

3

1

1

3

1

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

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

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

ͤ

Drawer#

7.10-6

7.10-7

7.10-8

7.10-9

7.10-10

7.10-11

7.11-0

7.11-1

7.11-2

7.11-3

7.11-4

7.9-12

7.9-13

7.9-14

7.9-15

7.9-16

7.10-0

7.10-1

7.10-2

7.10-3

7.10-4

7.10-5

7.11-5

7.12-0

7.12-1

7.12-2

7.12-3

7-12-4

7.9-1

7.9-2

7.9-3

7.9-4

7.9-5

7.9-6

7.9-7

7.9-8

7.9-9

7.9-10

7.9-11

7.8-1-12

7.8-1-13

7.8-1-14

7.8-2

7.8-2-1

7.8-2-2

7.8-2-3

7.8-2-4

7.9-0

7.12-5

7.12-6

7.12-7

7.12-8

7.12-9

7.12-10

7.12-11

7.12-12

΁ΒΣΥΤ͑ͽΚΤΥ

SEC_Code

JC64-00060F

JC64-00056G

JC39-00412A

JC64-00059E

JC72-00672A

JC96-04033A

JC61-01727A

JC60-00023A

JC66-00804A

JC61-01708A

JC31-00068A

JC66-00805A

6044-000159

JC66-00806A

6031-000023

JC66-01244A

JC72-00825A

JC97-02239C

JC61-01263C

JC70-00514C

JC70-00515C

JG66-40003A

JC63-00711A

JC96-04229A

JC63-01126A

4712-001032

JC39-00403A

JC39-00404A

4302-001183

JC96-02417A

6602-001067

JC97-02805A

JC63-00661C

JB68-00644A

JB01-00002A

JB01-00001A

JC96-04234Q

JC63-01213Q

JC73-00202A

JC73-00203A

JC92-01727A

JC64-00054F

JC63-00076A

JC64-00053G

JC64-00157D

JC64-00058A

JC64-00187A

JC64-00114A

1404-001373

JC67-00085A

JC61-01747A

6107-001163

JC61-01172A

JC66-01311A

JC66-00934A

6107-001291

Service(SA:service available,SNA:service not available)

Description QT'y Service

BATTERY-NIH(2ND)

ELA HOU-FULL SENSOR HARNESS

BELT-TIMING GEAR

MEA UNIT-SCAN UPPER

COVER-SCAN UPPER

LABEL(P)-SHADING

GLASS-PLATEN

GLASS-ADF

ELA HOU-OPE

COVER-OPE

RUBBER-TEL

RUBBER-SCROLL

PBA SUB-WHITNEY_OPE

KEY-COPY

COVER-WINDOW SF-530

KEY-TEL

KEY-SCAN TO

KEY-M-TONER SAVE

KEY-M-STOP

KEY-M_START

KEY-FAX

KEY-SCROLL

CBF HARNESS-OPE

KEY-RESOLUTION

PCT-LCD WINDOW

ELA UNIT-RX DRIVE

BRACKET-P_GEAR

SPACER-GEAR

GEAR-RDCN 139/83

BRACKET-P_MOTOR

MOTOR STEP

GEAR-RDCN 113/83

RING-C

GEAR-OPC DR 76/38/29

WASHER-PLAIN

GEAR-FUSER DRIVER

PMO-IMPELLER_DRV

MEA UNIT-MP TRAY

PLATE-MP

ADJUST-MP L

ADJUST-MP R

GEAR-PINION

SHEET-MP

ELA HOU-FUSER

COVER-FUSER

THERMOSTAT

CBF HARNESS-FUSER(110V)

CBF HARNESS-FUSER JOINT

THERMISTOR-NTC ASSY

CAP-M-THERMO

HOLDER-SPRING

SPRING-CS

HOLDER-M-EXIT F/DOWN

ROLLER-EXIT_MAIN

ROLLER-M_EXIT FR

SPRING-ES

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

3

3

1

1

3

3

4

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SNA

SA

SA

SNA

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

SNA

SNA

SNA

SNA

ͥ

Drawer#

7.13-3

7.13-4

7.13-5

7.13-6

7.13-7

7.13-8

7.13-9

7.13-9-1

7.13-9-2

7.13-9-3

7.13-9-4

7.12-33

7.12-34

7.12-35

7.12-36

7.12-37

7.12-38

7.12-39

7.12-40

7.13-0

7.13-1

7.13-2

7.13-10

7.13-11

7.13-11-1

7.13-11-2

7.13-11-3

7.13-12

7.13-13

7.13-14

7.13-15

7.13-16

7.13-18

7.13-19

7.13-24

7.13-25-1

7.12-22

7.12-23

7.12-24

7.12-25

7.12-26

7.12-27

7.12-28

7.12-29

7.12-30

7.12-31

7.12-32

7.12-13

7.12-14

7.12-15

7.12-16

7.12-17

7.12-18

7.12-19

7.12-20

7.12-21

΁ΒΣΥΤ͑ͽΚΤΥ

SEC_Code

JC61-01719A

JC66-00810A

JC63-01193A

JC72-01001A

JC63-01195A

JC66-01303A

JC61-00049A

JC60-00024A

JC97-02664A

JC61-01710A

JC66-01250A

JB61-00107A

JC70-10232A

JC39-00482A

JC63-01125A

JC63-00623A

JC63-00625A

JC97-02669A

JC61-01711A

JC69-00987A

JC63-00290A

JC61-70911A

JC61-01721A

JC70-00064A

JC72-20902A

JC66-00801A

6031-000023

6044-000001

4713-001211

JC66-01256A

JC61-00887A

JC61-00888A

JC66-01254A

JC66-00600A

JC66-10901B

JC61-00056A

JC61-01770A

JC61-00595A

JC63-01129A

JC63-01130A

JC63-01245A

JC66-01255A

JC66-01247A

JC97-02665A

JC66-01245A

JC66-01246A

6107-001163

JC33-00015B

JC72-00382B

JC66-01251A

JC72-00102A

JC61-70940A

JC66-01252A

JC70-00307A

JC61-01715A

JC61-01718A

Service(SA:service available,SNA:service not available)

Description QT'y Service

GUIDE-CLAW

IPR-PIN ROLLER EXIT

PEX-ROLLER F/UP(2)

GEAR-EXIT_DR38/25

WASHER-PLAIN

RING-CS

LAMP-HALOGEN

ROLLER-HEAT

BUSH-M-HR R_R2

BUSH-M-HR L_R2

GEAR-FUSER

ROLLER-PRESSURE

BUSH-PRESSURE_ROLLER

SPRING ETC-PR(7300)

FRAME-FUSER

GUIDE-M-INPUT

COVER-LAMP_R

COVER-LAMP_L

SHEET-FUSER

ROLLER-EXIT F/DOWN

HOLDER-EXIT R

GEAR-EXIT_DRV17

COVER-FUSER_FRONT

PMO-SUB STACKER

COVER-FUSER_SAFETY

ACTUATOR-JAM

SPRING ETC-TR(KOR)

SPACER-FUSER

MEA UNIT-PAPER PATH

GUIDE-PAPER PATH

ACTUATOR-FEED SENSOR

SPRING ETC-LEVER SENSOR

IPR-PLATE SAW

CBF HARNESS-MICRO SW

GROUND-P_SAW

GROUND-P-THV

GROUND-P-VARISTOR

MEA UNIT-HOLDER_PAD

HOLDER-PAD

PAD-FRICTION

SHEET-HOLDER PAD

SPRING ETC-EXIT ROLL FD

GEAR-FEED

MEA UNIT-PICK UP GEAR

GEAR-PICK UP A

GEAR-PICK UP B

SPRING-CS

SOLENOID-MP_R2

PMO-BUSHING FEED

ROLLER-FEED

PMO-BUSHING_TR(L)

SPRING ETC-TR(12)

SHAFT-FEED

IPR-P-EARTH TRANSFER

PLATE-P_IDLE HOLDER

HOLDER-IDLE ROLLER

1

1

1

1

1

1

1

1

1

1

1

1

2

1

2

1

2

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

2

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

4

3

3

SA

SA

SA

SNA

SNA

SNA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SNA

SNA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SA

SNA

SA

SNA

SNA

SNA

SNA

SNA

SA

SNA

SNA

SA

SNA

SNA

SNA

SA

SA

SA

ͦ

Drawer#

7.13-25-2

7.13-25-3

7.14-0

7.14-1

7.14-2

7.14-3

7.14-4

7.14-5

7.14-6

7.14-7

7.14-8

7.14-9

Replacement

Replacement

΁ΒΣΥΤ͑ͽΚΤΥ

SEC_Code

JC66-00529A

6107-001291

JB75-00300A

JC66-00829A

JC61-01281A

JC61-01717A

JC61-01716A

JC73-00239A

JC66-01253A

JC61-01713A

JC61-01714A

JC66-01258A

JC69-01026A

JF39-50094B

Service(SA:service available,SNA:service not available)

Description QT'y Service

ROLLER-M-IDLE FEED

SPRING-ES

MEC-PICK UP ROLLER ASSY

SHAFT-P-PICK_UP

BRACKET-P-BAR_PICK_UP

HOUSING-PICK UP B

HOUSING-PICK UP A

RUBBER-PICK_UP

ROLLER-PICK_UP IDLE

STOPPER-PICK_UP R

STOPPER-PICK_UP L

CAM-PICK_UP

BOX-MAIN

CBF LINE CORD

1

1

1

2

1

1

2

2

1

2

1

1

1

1

SA

SA

SA

SA

SNA

SA

SA

SA

SA

SA

SA

SA

SA

SA

ͧ

8

8. Block Diagram

8.1 System Block Diagram

Block diagram

Samsung Electronics

Service Manual

8-2

9

9. Connection Diagram

Connection Diagram

Samsung Electronics

Service Manual

9-1

Reference Information

10. Reference Information

10

of the tool list, the abbreviation table, the outline of model, and so on.

10.1 Troubleshooting Tool

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

DVM(Digital Volt Meter)

Standard : Indicates more than 3 digits.

• Cleaning Equipments

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

• Driver

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

• Vacuum Cleaner

• Spring Hook

Standard : For general use

• Tweezers

Standard : For general home use, small type.

• Cotton Swab

Standard : For general home use, for medical service.

• Software (Driver) installation CD ROM

Service Manual

10-1

Samsung Electronics

Reference Information

10.2 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

10-2

Service Manual

Samsung Electronics

Reference Information

Acronyms and Abbreviations(2)

Abbreviations

PTL

PWM

Q-PID

Q ty

RAM

ROM

SCF

SMPS

OPC

OPE

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

Samsung Electronics

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

Operate 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

Service Manual

10-3

Reference Information

10.3 Selecting printer locations

• 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

10-4

Service Manual

Samsung Electronics

Reference Information

10.4 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. The A4 ISO 19752 standard pattern samples are reproduced reduced to 70% of the actual A4 size.

A4 ISO 19752 Standard Patterns

Samsung Electronics

Service Manual

10-5

Circuit Description

1 1

11.1 Engine Controller

The engine controller module consists of a motor controller, a PWM controller, a LSU I/F controller, and an ADC I/F controller.

11.1.1 Heater Control

ENGINE CONTROL PART

Vcc

FUSER

THERM Rs

D2

914T1

Vcc Vcc

D1

914T1

R1

R5

5.6K

R3

3

IC1

LM393D

1

2

R4

R6

5.6K

D3

914T1

R7

1K

TR2 KSC

1008-Y

C

B

E

BD2

CN1

1

R2

C1

10nF

TR1

KSC

1008-Y

C

E

B

C2

1nF

BD1

2

THERMISTOR

R21

1.5K

+24Vs

2

1

PC1

AC CONTROL PART

CHOKE

R22 180

FUSIBLE

TRIAC

C21

104

R23

100

R24

120

C22

103

H

N

AC

VOLTAGE

HEAT

LAMP

The heat lamp radiates heat by using AC power. The AC power is a TRIAC (a semiconductor switch device) which controls a switch. The ‘ON/OFF’ control is completed by turning on/off a gate of the TRIAC through a photo TRIAC which is insulation part.

If explaining more detail about the AC control part, it consists of passive circuit ; therefore, it turns on/off the heater by receiving the signal from the engine control part. If the heater on signal is turned on at the engine, electricity flows in as the LED of the PC1 (Photo TRIAC) is connected. Then, it emits light.

By this light, the TRIAC unit, a light receiving unit, becomes on, and electricity is supplied to the gate of the TRIAC.

Then, the TRIAC is turned on. As a result, AC current flows in a heat lamp, and the heat lamp radiates heat.

On the other contrary, if the signal is turned off, the PC1 becomes off, and the TRIAC is turned off due to no electricity at the gate of the TRIAC. Consequently, the heat lamp is turned off.

Special Feature of TRIAC (THY 1): 16A, 600V SWITCHING

Phototriac Coupler (PC3)

Turn On If Current: 15mA~50mA (Design: 16mA)

High Repeive Peak Off State Voltage: Min 600V

Service Manual

11-1

Samsung Electronics

Circuit Description

FUSER_THERM1 nFUSER_EN

3.3V

3.3V

D7

MMSD914T1 nFUSER_ON

R12

10K

3.3V

DGND

KDS226

D5

1

3

2

R39

1K

R37

7.5K,1%

3.3V

C32

1nF

R38

470K,5%

R36

5.1K

R13

33K

R14

15.4K

R15

14.7K

5

6

U2-2

7

LM393D

DGND

C339

10nF

3

2

1

Q2

MMBT2222ALT1

Not used

C31

100pF

1

3

2

Q6

MMBT2222ALT1

R16

5.1K

DGND

C18

10nF

1

3.3V

3

2

KDS226

D26

CN3-1

1

2

35301-0250

3

DGND

1 2

D4

KDS226

DGND

3.3V

CN3-2

DGND

Explanation about the condition of Normal Operation

If the fuser (P3.7) port becomes high, the Q6 is activated. A heat lamp starts operating by the activity.

As the temperature of the heat lamp is increased, the resistance value of the thermister is decreased.

Therefore, the electric potential of the circled A becomes low.

On/Off operation of the Q6 is only controlled by the fuser (P3.7) port because 5(+) of the

U11(Comparator) is always higher than 6 (-) within the normal control temperature rage.

Functions of the Malfunction Protection:

If the fuser port (P3.7) is turned on regardless of controlling due to system malfunction, the temperature of the heat roller goes abnormally high. At this time, the resistance value of the thermister becomes low.

When the resistance value of the thermister becomes low, the electric potential of the circled A gets low, and when the temperature goes over the certain temperature, the comparator (U11) gets a low output.

As a result, even though the fuser port is abnormally activated, it is disable to be over the regular temperature. For maintaining a regular temperature, a protect circuit consists in it (This protection is set up to start operating at the rage between 205°~210°)

11-2

Service Manual

Samsung Electronics

Circuit Description

11.1.2 PWM Controller

Function Description

PWM TIMER consists of each sub block which has various functions. The sub block is divided based on this block diagram. The entire diagram of the PWMTIMER is organized as below.

PWM TIMER OPERATION is figured out if calculating PHCLK by the value selected by the register setting and the divider. PHCLK is created by count block at the PWM TIMER

11.1.3 Motor Driver

A motor drive circuit is decided when selecting a driver IC. (Supplied by vendor) ML1610 uses the motor driver IC of

AN44060. However, the sensing resistance Rs value and the Vreference resistance value are variable according to the motor drive current value.

Service Manual

11-3

Samsung Electronics

Circuit Description

11.1.4 LSU Controller

The laser scanning unit controller (LSUC) of Jupiter4E is a block for interface between PVC block and LSU.

LSUC sends the video data received from PVC and the laser diode turn On/Off signal created by inner 21 bit counter to the laser diode of LSU. LSU creates the horizontal sync signal (nHSYNC) by sensing the inputted diode turn on/off signal with the attached sensor. nHSYNC is inputted to PVC and LSUC as a signal that informs the beginning of one line. Also, LSU makes the activity of nLREADY signal (ready to print) low when the polygon motor becomes regularly rotating. LSU can recognize the regular rotation status of the polygon motor by reading nLREADYFlag bit in SFR.

Once the polygon motor regularly rotates, it sends the page sync signal (nPSync) to PVC by writing ‘1’ at LSUCON[5] in LSUC, and PVC starts operating for one page printing. After that, every time nHSYNC signal is created, PVC senses the signal and outputs the video data (PVC_VDO) to LSUC. At this time, LSUC creates the video window (Printing area) and masks it on the video data sent by PVC. LSUC sends the completed video data (LSU_VDO) to the laser diode in LSU.

Also, LSUC supplies LSU_CLK, created by counting the system clock with the operation clock source of LSU, for the use of substitution for oscillator. The SFR is set up in IsuSfr block by receiving the bus control signal from APB bus, and the settled register values are redelivered to IsuCon block. IsuCon block creates a signal for controlling the laser diode of LSU and outputs it to a pad. The digital filter module is a digital filter to provide against the noise loaded in nHSYNC and nLREADY signal which directly get into the chip. It is three layer filter, and the delay time is 3*System

Clock Time.

The interface between PVC and LSUC is shown in the picture.

nHSYNC

LSUC nHSYNC

LSU_VDO

PVC_VDO nPSync

0

1

LSU_VDO

PVC_TEST_EN

PVC nLSYNC nFSYNC

PVC_TEST_EN

1

0 nFSYNC

VDO

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Circuit Description

APB

BRIDGE

PWRITE

PSEL

PENABLE

PADDR[4:0]

PWDATA[31:0]

PRDATA[31:0]

PVC nPSync

LSUC

DigiFilter nLREADY_FO

DigiFilter nHSYNC_FO nLREADY nHSYNC ls uSfr nLREADYFlag flagClear lsuControl[8:0] windowOnTime[20:0] windowOffTime[20:0] ldOnTime[20:0] ldOffTime[20:0] patternDuty[9:0] lsuClkDuty[18:0]

SHOnTime[20:0]

SHOffTime[20:0] lsu Con

DAC

LSU_CLK

LSU_VDO

DAC_OUT

ENGIN E

APCCON[11:0] apcOnTime[20:0] apcOffTime[20:0]

Pmax[9:0]

Pmin[9:0]

Ka[14:0]

REF[24:0]

Kp[15:0]

Ki[4:0]

Ky

YMAXH[8:0]

YMAXL[31:0]

YMINH[8:0]

YMINL[31:0]

YINITH[8:0]

YINITL[31:0]

KU[5:0]

U_VALUE[25:0]

SEH[4:0]

SEL[4:0]

L_VAL UE[9:0]

HCLR[20:0]

PI

Control

Bl ock

PD

ADC

THER

THV

CKIN.

ADC_EN

SEL[1:0]

ADO_2[9:0] ap cOn

ADC

Cont roller

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Circuit Description

The main signals used in LSU Controller are shown in the table.

Name

PVC-VDO nLREADY nHSYNC nPSync

LSU_VDO

Direction

I

I

I

0

0

Description

The video data output from PVC.

Its activity becomes low as the polygon motor of LSU gets the regular speed.

It informs the beginning of one line. It is the same as nLSYNC of PVC.

It is inputted to nFSync of PVC.

The completed video data output by masking video window on PVC_VOD.

Laser Diode & Window On/Off Time first field second field nHSYNC windowOn ldOn windowOnTime windowOffTime ldOnTime ldOffTime testPattern pattern start counter start

11.1.5 ADC Controller

ChoursM ADC Controller has 8 analog input channels.

It automatically converts the 8 channels in turns with 10 bit 500KSPS adc1341x_pc, and also it makes the conversion on the desired time by manually controlling STC of the register. After finishing the conversion, it makes the interruption to be pending. When AD conversion of 3 rd channel ends for the PI Control of LSU, it sends the 10bit digital data converted with the latch short pulse signal to LSUC.

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Circuit Description

11.2 System Overview

SCX-4725FN is made Main Control part, Operation Panel part, PC Interface part, Scan part, Line Interface part,

Power part.

Each part is independent with each other and the design concept is common use/standard design rule.

Chorus-M ASIC which is made for only printer is used in the Main Control part, and another Micom which can communicate with Chorus-M through UART for Key-Scan, LCD display, LED control, etc.. is used for OPE Panel part.

PC interface control part USB 2.0 Chorus-M Controller ASIC and Image processor is comprised in the Chorus-M

Modem chip, SFX336 which make a function of FACSIMLE can the machine communicate with the other FAX machine on the speed of 33.6Kbps and the LIU(Line Interface Unit) supports the line connection with PABX or

PSTN line.

Power part which made of two part-SMPS and HVPS-supplies Voltage source to the controller part and high voltage to the printing image developting process.

11.2.1 Engine H/W Specification

1) Recording Method : LSU(Laser Scanning Unit)

2) Printing Speed : 24ppm

(In continuing printing base Letter, printing pages from 2nd to last during 1min)

3) Recording Density : 1200 dpi

4) Cassette Capa. : Cassette ; 250sheets(75g/ Base),

1-sheet Feeding : N/A((DRIVE Selection : Paper, OHP, Envelop - 1 sheet)

5) Manual Tray : All paper 1 sheet

6) Paper Size : Cassette, Manual ; Width = 76 ~ 216mm, Length = 125mm ~ 356mm

7) Effective recording size

- A4 :202 x 291 mm

- Letter : 208 x273mm

- Legal : 208 x 350 mm

- Folio : 208 x 325 mm

- TopMargin: 2 2 mm

- Left, Right Margin : 2 2 mm

8) CRU(Toner Cartridge)Life : 3,000pages Printing(A4, ISO 5% Pattern Printing)

9) First Print Out Time : within 11sec ( Standby )

10) Warming up time : within 35sec (Ambient : 25 °C)

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Circuit Description

11.2.2 Main Board Control Part

Main control part of SCX-4725FN is made of ASIC(CPU, Image processor, PC I/F part include, Scan interface part, FAX Modem part and Printing process I/F part. CPU handles the BUS control, I/O interface, scan interface,

PC interface and other miscellaneous driver circuit.

1) Main Board

- Main Board has a function of sending Current Image Video Data to LSU of the machine, controlling motor Driving Circuit and monitoring Paper Exit Sensor, Cover Open switch, OPE Panel Inputs.

2) Main Controller

- CPU : ARM 920T which is exclusive controller to execute Printer & FAX Function and to executs operation block by flash memory sithin system program, and ot control whale system.

Main function block

Completely integrated System for Embedded Applications

PVC

- Dual/Single Beam, - LVDS Pad(VDO, HSYNC), - Support A3 1200dpi, multi-pass color.

HPVC

- Dual/Single Beam, - LVDS Pad(VDO, HSYNC), - Support A4 600dpi, multi-pass color.

DMA

- 6 Channels (if not use CIP4e, 4ch is available for exfernal DMA.

if CIP4E used (a 4 DMA channel use), 2ch available for external DMA.

Operation Frequency : CPU Core -> over 300MHz, System Bus -> 100MHz

Operation Voltage : CPU Voltage -> 1.2V, I/O Pad Voltage -> 3.3V, RTC Voltage -> 3V

- Flash Memory : Stores system program and can be updated to the newer system program code through the PC interface. It stores the FAX Journal List, One Touch dial number, speed dial number, and machine configuration setup data.

Capcity : 16 Mbyte (NOR Type)

Access Time : 70 nsec

- SDRAM : SDRAM is used for Print Buffer, Scan buffer when scanning, ECM Buffer when FAX

Receiving, and system working memory.

Capacity : 32 Mbyte

Access Time : 166MHz(Max)

Data Backup : 48 Hours

Backup Battery Charging Time : 100hours when completely discharged.

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Circuit Description

11.2.3 Scan Part

1) Image Signal Input Part

- Image Signal from CIS has a level of about 1.2V and is goes to ADC of Chorus2.

After ADC, CIS analog signal will be converted to 8-bit Digital signal.

2) Image Processing

- On the surface of the original paper, the light from the CIS LED reflected and goes to the CIS Sensor.

Then the light is converted to the appropriate voltage suitable for ADC input. Analog signal from CIS sensor is used for ADC input then is converted to 8-bit digital data. Image processor of the Chorus2 will do the Shading correction function at first, then Gamma correction function next. After then, the data goes to different module according to the copy or FAX resolution mode. When Text mode, the image data goes to LAT module, when Photo mode, the image data goes to Error Diffusion module, when PC-Scan mode, the image data goes directly to the PC through DMA access.

Summary of the Image sensor interface is as below;

- Minimum Scan Line Time :1.5ms

- Scan Resolution : 600*600 dpi

- Scan Width : 208mm

- Function

White Shading Correction

Gamma Correction

CIS Interface

256 Gray Scale

3) CIS Driving Part

- CIS Supply Voltage : +3.3V

- CIS Max frequency : 5MHz

- CISLinetime

Fax/Copy - 1.5ms

PC-Scan - 4.5ms

- White output volt. : Max 0.8V

4) ADF Driving Part : Driving ADF Stepper motor, and the maximum motor speed is 2000PPS.

- MOTOR DRIVER : A3978(Allegro)

- Driving Voltage : 24V DC

- Phase : 2-2 Phase 2000PPS at Quick Scan,

2-2 Phase 1000PPS AT Fine Scan,

2-2 Phase 667PPS AT Super Fine Scan

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Circuit Description

11.2.4 FAX Modem Part

1) Modem Part

- The modem part is consist SFX336(FAX Modem chip), LIU(Line Interface Unit) and Data Access

Ayyangement (DAA)

Modem (SFX336) specification.

2-wire half-duplex fax modem modes with send and receive data rates up to 33,600 bps

V.17, V.34, V.29, V.27 ter, and V.21 Channel 2

Short train option in V.17 and V.27 ter

PSTN session starting

V.8 and V.8bis signaling

HDLC support at all speeds

Flag generation, 0-bit stuffing, ITU CRC-16 or CRC-32 calculation and generation

Flag detection, 0-bit deletion, ITU CRC-16 or CRC-32 check sum error detection

FSK flag pattern detection during high-speed receiving

Tone modes and features

Programmable single or dual tone generation

DTMF receiver

Tone detection with three programmable tone detectors

Receive dynamic range:

0 dBm to -43 dBm for V.17, V.29, V.27 ter and V.21 Channel 2

9dBm to -43 dBm for V.34 half-duplex

Digital speaker output to monitor received signal

Two16-byte FIFO data buffers for burst data transfer with extension up to 255 bytes

V.21 Channel 1Flag detect

V.21 Channel 1Flag detect

+3.3V only operation

Typical power consumption

Normal mode: 264 mW

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Circuit Description

11.2.5 Printing Process Part

Printing Process part is made of PC-Interface part, PVC(Priter Video Controller), LSU control part, High Voltage control part and Fuser Unit control part. PC-interface core is included in the Chorus2 ASIC and controls the PCinterface. LSU control part controls the LSU polygon motor, Laser diode, video data output so thatthe printing image can be made up on the OPC Drum.

11.2.6 Line Interface Part

Line interface part helps the machine connect to the PSTN or PABX Line.

Its main function is Line connection, Line state monitoring and TAD interface that enables a extension telephone or TAD machine to the SCX-4725FN machine.

11.2.7 Engine Paper Feeding

1) Feeding Type : MP Cassette Type

2) Feeding Standard : Center Loading

3) Feeding Qty : Cassette 150 sheets (75g/ , 20lb paper standard)

4) 1 sheet (Paper, OHP, Envelope etc.)

5) Separating Type: Cassette - Friction Pad Type

6) Manual Tray : 1 sheet

7) Driver Type : Driving by Gearing from Main Motor

8) Pick_up Roller Driver : Solenoid

9) Pick up Roller Rubber Material : EPDM+IR =1.3 or more

10) Pick up Velocity : 94.8731mm/Sec (Process : 93.0667mm/sec)

11) Paper detecting Sensor : Photo Sensor

12) Paper Size Sensor : None

13) Paper Separating Pad Material : NBB 52 °, =0.8~1.2

14) Separating Pad Pressure : TBD 150 gf

15) Pick_up Roller RPM : 47.683 RPM

16) Feeding Pressure (Same as Transfer Roller)

: TBD 150~200gf (SPRING H mm, based on 1sheet)

TBD 150~200gf (SPRING H mm, based on 150sheets)

17) Paper Exit Type : Face Down

18) Feed Roller Force : TBD Kg.f or more.

19) Spring Feed Tensile Force : TBD gf

20) Feed roller Velocity : mm/sec

21) Feed Roller Material : -

22) Exit Sensor : Photo Sensor

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Circuit Description

11.2.8 Deverope Process

- Developing Method : Non magnetic 1 element contacting method

- Toner : Non magnetic 1 element shatter type toner

- Toner Qty : 35gf /60gf (1k/3k)

- The life span of toner 1k/3k sheets (ISO Std. Coverage )

- Toner Residual Sensor : None

- OPC Cleaning : Use the conventional cleaning blade

- Handling of wasted toner : Discard by collecting waste-toner at waste-toner bin.

- OPC Drum Protecting Shutter : None

- Classifying device for toner cartridge: ID is classified by interruption of the frame channel.

- Development Roller type : conductive elastic roller

- Doctor BLADE Type : Regulating toner layer by pressure

- Charge Roller Type : Conductive Roller Contact-Charge

11.2.9 Sanner Part

600dpi Color CIS Module for Flat bed, SCX-4725FN uses the CIS scanning method

1) CIS SPEC

- Scanning size : 216 mm ( width for letter-size)

- Light source : LED

- Scanning sensor: CIS 600/300 dpi

- Scanning mode : Color SCAN / Mono SCAN

- MTF : 30% (300 dpi Chart)

- CIS interface : Analog output

- Power supply : 3.3V

- Clock Frequency: 5.5MHz max.

- Number of output : 1

- LED Current : Green/Blue : 50mA, Red : 60mA

- Clamp Level : 1.4V

- Connection : 12 pin FFC connector (pitch 1.0mm)

2) Scan Resolution

(a) Transmission

- Normal : Vertial: 3.85 Line/mm, Horizontal: 8 Pels/mm : 203 x 98dpi

- Fine : Vertial: 7.7 Line/mm, Horizontal: 8 Pels/mm : 203 x 196dpi

- Super Fine : Vertial: 11.8 Line/mm, Horizontal: 11.8 Pels/mm ; 300 x 300dpi

(b) When Copy : Vertial: 11.8 Line/mm, Horizontal: 23.6 Pels/mm : 600x300dpi(ADF)

Vertial: 23.6 Line/mm, Horizontal: 23.6 Pels/mm : 600x600dpi(Platen)

3) Half Tone (Gray Scale) : 256 Levels

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Circuit Description

4) Scan Line Time

(a) Tx

- Normal : 1.5 ms/Line

- Fine : 1.5 ms/Line

- Super Fine : 1.5 ms/Line

(b) Copy : 1.5 ms/Line

(c) Scan

- Color : 4.5msec/line

- Gray : 4.5msec/line

- Mono : 4.5msec/line

5) Scanning Width

- MAX SCAN WIDTH : 216 mm (8.5 inches)

- Effective Scan Width: 208mm

6) ADF Motor

(a) Motor Spec

-

-

: 24VDC

: 0.6A(Peak)

7) Motor Driver speed & method

(a) FAX Transmission

- Normal Mode : 2000 pps, 2-2

- Fine Mode : 1000 pps, 2-2

- Super Fine Mode : 667 pps, 2-2

(b) Copy Job : 667 pps, 2-2

- max(30sheets) : 50gf

- min(1sheets) : 20gf

8) Document Detect sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED - max current : 30mA

- max voltage : 3.3V

(d) Output - Logic "H" : No Paper

- Logic "L" : Paper

(e) Lever-Sensor DOC : ADF Lower Torsion Spring

9) Regi Detect sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED - max current : 50mA

- max voltage : 3.3V

(d) Output - Logic "H" : No Paper

- Logic "L" : Paper

(e) Lever-Sensor DOC : ADF Lower Torsion Spring

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Service Manual

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Circuit Description

10) Document Scan sensor

(a) Type : Photo interrupt

(b) Position : ADF PBA

(c) LED : - Max current : 50mA

- Max Voltage : 3.3V

(d) Output - Logic "H" : Off(No Position), No Paper

- Logic "L" : On (Doc Position), Paper

(e) LEVER - SENSOR SCAN : Scan Lower Torsion Spring

11.2.10 OPE(Operational Panel Equipment)

1) Ope Panel

OPE Panel has a MICOM Chip on it and communicates with Main CPU using Serial communication

Line(SIO). OPE Panel consists of Micom, Key Matrix Part, LED Driving Part and LCD Part.

2) Key Description

No Part

1 Common

2 Save

3 Copy

4 Fax

5 Scan

Feature

3*4Key

Start

Stop/Clear

Menu

Upper Level

Enter

Toner Save

Reduce/Enlarge

No.of Copies

Original Type

Darkness

Favorite Copy

Resolution

Phone Book

Broadcasting

On Hook Dial

Redial / Pause

Scan to

Function

Dialing and Option Input

Starting Fax/Copy Job

Cancel Current Job/Return to default

Option select

Return to upper level menu

Option select/Execute

Next menu or Next option item

Previous menu or Previous option item

TONER SAVE MODE select

Select ZOOM ratio when copy

Select the number of copies

Change Copy Modes(Text,Text/Photo,Photo)

Change the Darkness of the Copied image (Light/Normal/Dark)

Select one of the predefined Copy templates.

STANDARD>FINE>SUPER

FINE>PHOTO>COLOR

Search the user defined Phone number.

When sending FAX data to many place in the same time.

On Hook Dial

Last number Redial / Pause select [scan to PC], [scan to FAX], [scan to E-mail] function.

3) LCD Part

- Number of Characters : 16 Characters x 2 line

Clock, Date display

System Status display

Alarm, Error Message display

Function Dialog Message display

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ELECTRONICS

* This service manual is a property of Samsung Electronics Co., Ltd.

Any unauthorized use of Manual can be punished under applicable international and/or domestic law.

* This service manual is also provided on the web, the ITSELF system Samsung Electronics Co., Ltd.

“http://itself.sec.samsung.co.kr”

Samsung Electronics Co.,Ltd. August. 2006

Printed in Korea.

VERSION NO. : 1.00 CODE : JC-0179 I

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