Samsung SCX-4720F Bedienungsanleitung

SERVICE

DIGITAL LASER MFP

SCX-4720F Series

SCX-4720F

SCX-4520

Manual

DIGITAL LASER MFP CONTENTS

1. Precautions

2. Reference Information

3. Specifications

4. Summary of product

5. Disassembly and Reassembly

6. Alignment and Adjustments

7. Troubleshooting

8. Exploded Views and Parts List

9. Block Diagram

10. Connection Diagram

11. Schematic Diagram

Precautions

Samsung Electronics Service Manual

1-1

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.

(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 haz-ards.

(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 GE FFNET.

NICHT DEM STRAHLAUSSETZEN.

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 LASERSTR LNING VED BNING, N R

SIKKERHEDSBRYDERE ER UDEAF FUNKTION.

UNDG UDSAETTELSE FOR STR LNING.

ADVARSEL. - USYNLIG LASERSTR LNING N R DEKSEL

PNES. STIRR IKKE INN I STR LEN.

UNNG EKSPONERING FOR STR LEN.

VARNING - OSYNLIG LASERSTR LNING N R DENNA DEL

R PPNAD OCH SP RREN R URKOPPLAD.

BETRAKTA EJ STR LEN. STR LEN R FARLIG.

VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA

OLETALTTIINA N KYM TT M LLE LASER-

S TEILYLLE L KATSO S TEESEEN.

Samsung Electronics

Service Manual

Precautions

1-2

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 com-

pletely 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.

Precautions

Samsung Electronics Service Manual

1-3

1.2.3 Handling Precautions

The following instructions are for your own personal safety, to avoid injury and so as not to damage the printer

(1) Ensure the printer is installed on a level surface, capable of supporting its weight. Failure to do so could cause

the printer to tip or fall.

(2) The printer contains many rollers, gears and fans. Take great care to ensure that you do not catch your fingers,

hair or clothing in any of these rotating devices.

(3) Do not place any small metal objects, containers of water, chemicals or other liquids close to the printer which if

spilled could get into the machine and cause damage or a shock or fire hazard.

(4) Do not install the machine in areas with high dust or moisture levels, beside on open window or close to a

humidifier or heater. Damage could be caused to the printer in such areas.

(5) Do not place candles, burning cigarettes, etc. on the printer, these could cause a fire.

1.2.4 Assembly / Disassembly Precautions

Replace parts carefully, always use Samsung parts. Take care to note the exact location of parts and also

cable routing before dismantling any part of the machine. Ensure all parts and cables are replaced correctly.

Please carry out the following procedures before dismantling the printer or replacing any parts.

(1) Check the contents of the machine memory and make a note of any user settings. These will be erased if the

mainboard or network card is replaced.

(2) Ensure that power is disconnected before servicing or replacing any electrical parts.

(3) Disconnect printer interface cables and power cables.

(4) Only use approved spare parts. Ensure that part number, product name, any voltage, current or temperature

rating are correct.

(5) When removing or re-fitting any parts do not use excessive force, especially when fitting screws into plastic.

(6) Take care not to drop any small parts into the machine.

(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.

Samsung Electronics

Service Manual

Precautions

1-4

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 15.6kg including toner cartridge and cassette. Use safe lifting and handling techniques. Use

the lifting handles located on each side of the machine. Back injury could be caused if you do not lift carefully.

(4) Ensure the printer is installed safely.

The printer weighs 15.6Kg, 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.

Precautions

Samsung Electronics Service Manual

1-5

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 avail-

able 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 assem-

bly.

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 dam-

age 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 compa-

rable conductive material.

7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch the pro-

tective 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 com-

pletely 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. 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.

1.4 Super Capacitor or Lithium Battery Precautions

Reference Information

Samsung Electronics Service Manual

2-1

2. Reference Information

This chapter contains the tools list, list of abbreviations used in this manual, and a guide to the

location space required when installing the printer. A definition of test pages and Wireless

Network information definition is also included.

2.1 Tool for Troubleshooting

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.

• Driver

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

long, M2 short).

• Tweezers

Standard : For general home use, small type.

• Cotton Swab

Standard : For general home use, for medical service.

• Cleaning Equipments

Standard :An IPA (Isopropyl Alcohol) dry wipe tissue or

a gentle neutral detergent and lint-free cloth.

• Vacuum Cleaner

• Spring Hook

Standard : For general use

• Software (Driver) installation CD ROM

Service Manual

Reference Information

2-2

Samsung Electronics

2.2 Acronyms and Abbreviations

The table in the below explains abbreviations used in this service manual.

The contents of this service manual are declared with abbreviations in many parts. Please refer to the

table.

AC Alternating Current

ADF Automatic Document Feeder

ASIC Application Specific Integrated Circuit

ASSY assembly

BIOS Basic Input Output System

CCD Charge Coupled Device

CMOS Complementary Metal Oxide Semiconductor

CN connector

CON connector

CPU Central Processing Unit

CRUM Customer Replaceable Unit Memory

dB decibel

dbA decibelampere

dBM decibel milliwatt

DC direct current

DCU Diagnostic Control Unit

DPI Dot Per Inch

DRAM Dynamic Random Access Memory

DVM Digital Voltmeter

ECP Enhanced Capability Port

EEPROM Electronically Erasable Programmable Read

Only Memory

EMI Electro Magnetic Interference

EP electrophotographic

EPP Enhanced Parallel Port

FCOT First Copy Out Time

F/W firmware

GDI graphics device interface

GND ground

HBP Host Based Printing

HDD Hard Disk Drive

HV high voltage

HVPS High Voltage Power Supply

I/F interface

I/O Input and Output

IC integrated circuit

IDE Intelligent Drive electronics or Imbedded

Drive Electronics

IEEE Institute of Electrical and Electronics

Engineers. Inc

IPA Isopropy Alcohol

IPM Images Per Minute

LAN local area network

lb pound(s)

LBP Laser Beam Printer

LCD Liquid Crystal Display

LED Light Emitting Diode

LSU Laser Scanning Unit

MB Megabyte

MFP Multi-Functional Product

MHz Megahertz

NVRAM Nonvolatile random access memory

OPC Organic Photo Conductor

PBA Printed Board Assembly

PCL Printer Command Language , Printer Control

Language

PDL Page Discription Language

PPM Page Per Minute

PTL Pre-Transfer Lamp

Q’ty Quantity

RAM Random Access Memory

ROM Read Only Memory

SCF Second Cassette Feeder

SMPS Switching Mode Power Supply

SPGP Samsung Printer Graphic Processor

SPL Samsung Printer Language

Spool Simultaneous Peripheral Operation Online

SW Switch

Sync Synchronous or synchronization

TBD To Be Determined

USB Universal Serial Bus

Reference Information

Samsung Electronics Service Manual

2-3

2.3 The Sample Pattern for the Test

The sample pattern shown in below is the standard pattern used in the factory.

The life of the toner cartridge and the printing speed are measured using the pattern shown below.

(The image is 70% of the actual A4 size).

2.3.1 A4 5% Pattern

Service Manual

Reference Information

2-4

Samsung Electronics

2.3.2 A4 2% Pattern

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