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DIGITAL LASER MFP
SCX-4200 Series
SCX-4200/XAX
Basic Model : SCX-4200
Manual
SERVICE
DIGITAL LASER MFP The keynote of Product
[ Key Features ]
- 18ppm Print/Copy Speed
- 600dpi Print/Copy Resolution
- 600 x 2400dpi Scan Resolution
- Samsung Print Language
- 8MB System Momory
- 250sh Paper Input/50sh Paper Output
- Under 42sec Warm-up Time
- 16 x 2 Line LCD Display
- USB 2.0
- 3K Toner Yield: initial(1K), sales(3K)
- Special Copy: ID Copy, Clone, 2-up, Poster,
Autofit
SCX-4200 Series
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.
Samsung Electronics Co.,Ltd. November. 2005
* This service manual is also provided on the web, the ITSELF
system Samsung Electronics Co., Ltd. Printed in Korea.
http://itself.sec.samsung.co.kr VERSION NO. : 1.00 CODE : JC-0155C
Contents
1. Precautions
1.1 Safety Warning 1-1
1.2 Caution for safety 1-2
1.3 ESD Precautions 1-5
1.4 Super Capacitor or Lithium Battery Precautions 1-5
2. Product Specification
2.1 Product Overview 2-1
2.2 Specifications 2-2
3. System Overview
3.1 System Outline 3-1
3.2 H/W Structure abd Descriptions 3-9
3.3 S/W Structure and Descriptions 3-19
4. Alignment and Adjustments
4.1 Engine Test Mode 4-1
4.2 Paper Path 4-2
4.3 Clearing Paper Jams 4-3
4.4 Printing the System Data List 4-6
4.5 Clearing the Memory 4-6
4.6 Clearing the Drum 4-6
4.7 Consumables and Replacement Parts 4-7
4.8 The LCD Status Display by Each Error 4-7
4.9 Periodic Defective Image 4-8
4.10 Error Message 4-9
Continued
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 Front Cover 5-2
5.3 Rear Cover 5-3
5.4 DC Fan 5-4
5.5 Right Side Cover 5-5
5.6 Left Side Cover 5-6
5.7 Scanner Unit 5-7
5.8 OPE Unit 5-10
5.9 Middle Cover Unit 5-11
5.10 Fuser 5-12
5.11 Exit Roller 5-14
5.12 LSU 5-15
5.13 Fan 5-16
5.14 Drive Ass'y 5-16
5.15 Engine Shield Ass'y 5-17
5.16 Main PBA 5-17
5.17 SMPS 5-18
5.18 CRUM PCB 5-19
5.19 Transfer Roller 5-20
5.20 Feed Roller 5-21
5.21 Pick Up Roller & Solenoid 5-23
6. Troubleshooting
6.1 Procedure of Checking the Symptoms 6-1
6.2 Solution of Image Problem 6-5
6.3 Paper Feeding Problems and Troubleshooting 6-10
6.4 Symptoms of Bad Operation and Troubleshooting 6-13
6.5 Treatment of Error Message 6-17
Continued
7. Block diagram
7.1 System Block Diagram 7-1
8. Exploded Views & Parts List
8.1 Exploded Views and Parts List 8-1
9. Connection Diagram
9.1 SCX-4200 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-1
10.2 OPE Circuit Diagram 10-8
10.3 SMPS-110V 10-9
10.3 SMPS-220V 10-13
11. Reference Information
11.1 Tools for Troubleshooting 12-1
11.2 Acronyms and Abbreviations 11-2
11.3 Select a location for the printer 11-4
11.4 A4 ISO 19752 Standard Pattern 11-5
Precautions
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 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 GE FFNET.
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 LASERSTR LNING VED BNING, N R
SIKKERHEDSBRYDERE ER UDE AF 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
OLET ALTTIINA N KYM TT M LLE LASER-
S TEILYLLE L KATSO S TEESEEN.
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 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.
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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.
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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 12.1kg Gross Weight(With Package). 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 9.5Kg(Net Weight / inc. Toner Cartridge), ensure the printer is installed on a level surface,
capable of supporting its weight. Failure to do so could cause the printer to tip or fall possibly causing personal
injury or damaging the printer.
(5) Do not install the printer on a sloping or unstable surface. After installation, double check that the printer is stable.
Service Manual
1-4
Samsung Electronics
Precautions
1.3 ESD Precautions
Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly called
"Electrostatically Sensitive (ES) Devices", or ESDs. Examples of typical ESDs are: integrated circuits, some field
effect transistors, and semiconductor "chip" components.
The techniques outlined below should be followed to help reduce the incidence of component damage caused by
static electricity.
Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known earth ground. Alternatively, employ a commercially 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.
1.4 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
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Samsung Electronics
Product Specifications
2
2. Product Specification
2.1 Product Overview
Item
Basic Model SCX-4200/SEE
Descriptions Remark
Series Model SCX-4200
Market of Sailes Persnal user MFP(Low Price for small work Group.)
Specification 18ppm(Ltr. 19ppm), Chorus2(CPU : Use 16/32 Bit RISC Processor)
1K(initial), 3K(sailes)
USB 2.0
250pages feeding, 50pages Face Down
Service Manual
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Samsung Electronics
Product Specifications
2.2 Specifications
Specfications are correct at the time of printing. Product specifications are subject to change without notice. See below for
product specifications.
2.2.1 General Specifications
Items SCX-4200 Remarks
General Major Features Copier,Print,Scan
Size (W*D*H) 16.6"x15.8" x9.4"
(409x362x232mm)
Net Weight(Inc. Toner Cartridge) 9.5 Kg
Net Weight(exc. Toner Cartridge) 8.7 Kg
Gross Weight(with package) 12.1 Kg
LCD 16*2 Char No BackLight
I/O Interface USB 2.0
Power Printing Operation 350 Wh
Consumption Sleep Mode Energy Star Compliant
Power Switch Yes
Noise Operating 53 dBA
Standby 38 dBA
Warm Up Time from Cold Status Less than 30 seconds
Machine Life Max. Monthly Volume Print 4K pages
(Duty Cycle) Scan 800 pages
Average Monthly Print Volume 500 Pages
Machine Life 5 years, 50,000 Pages
Whichever comes first.
Approval Class B
Device Memory 8MB
Internal N/W Option N/A
Page Counter Yes
Print Configuration Yes
Sheet
Maintenance Pickup Roller 50,000 Pages
Separation Pad 50,000 Pages
Transfer Roller 50,000 Pages
Fuser Unit 50,000 Pages
Service Manual
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Samsung Electronics
Product Specifications
2.2.2 Print Specification
Items SCX-4200 Remarks
PRINT Print Speed 19ppm/Ltr, 18ppm/A4
Print Method Laser
Print Language SPL
Power Save Yes(5/10/15/30/45min.)
Resolution Normal 600 x 600 dpi
RET No
Toner Save Yes LCD Only (Toner
Save On/Off
Setting method
is in the Menu).
Memory 8MB
FPOT From Stand by Approx. 11 seconds
From Cold Status Less than 41 seconds
Duplex Print N.A
Printable Area 208 x 273 mm (Letter)
Halftone(Gray Scale) 256 levels
2.2.3 Scan Specification
Items SCX-4200 Remarks
SCAN Scan Method Color CIS
Scan Speed through Lineart, Halftone 15 sec
Platen Gray 30 sec
Color 75 sec
75dpi/300dpi
Resolution Optical 600*2400dpi
Enhanced 4800dpi*4800dpi (USB)
Halftone 256level
Scan Size Max. Document Max.216mm(8.5")
Width
Effiective Scan Max 208mm(8.2inch)
Width
Scan-to E-mail, Image, OCR, WEB "through PC -->
Through PC means "from
SmarThru4
application".
Scan Depth Color 24 bit
Mono 1bit for Lineart, Halftone,
8 Bit for Gray scale
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Samsung Electronics
Product Specifications
2.2.4 Copy Specification
Items SCX-4200 Remarks
COPY Copy Quality Selection or Text 600x300dpi
Original Image type Text/Photo 600x300dpi
selection Mode Photo 600x600dpi for Platen
FCOT Stand by Approx. 11 seconds
From Cold Status Less than 41 seconds
Copy Speed / Letter SDMC at all mode 19cpm/Ltr. 18cpm/A4 SDMC: Single
Document
Multiple Copy
Resolution Scan:600*600dpi
Print:600*600dpi
Zoom Range 50% to 200%
Multi Copy 1~99
Preset Yes
Darkness Control 3 level Light, Normal, Dark
Copy Mode(=Original Type) Text, Text/Photo, Photo
Collation Copy N/A
Auto return to default mode Yes(after 1 minute) Time can be
changeable;
15,30,60,180sec, Off
Changeable Default mode Darkness, Original Type,
Reduce/Enlarge, No. of Copies,
Special Copy 2-up copy Yes(Platen only)
Collation Copy N/A
AutoFit Copy Yes(Platen only)
2 Sides in 1 pg Yes(Platen only) * Copy 2-side printed
original document
into one page(ex. ID
Card Copy)
Clone Yes(Platen only)
Poster Yes(Platen only)
Service Manual
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Samsung Electronics
Product Specifications
2.2.5 Paper Handiling Specification
Items SCX-4200 Remarks
Paper Handling Capacity( 20lbs) Main Tray 250sheets
Bypass(MP Tray) Single Sheet
Optional Cassette No
Output Capacity Face Down: 50Sheets/20lb
Face Up: 1Sheet
Output Control Face down/Face up
Paper Size Main Tray Legal,A4,Letter, Folio,
Executive, B5, A5, A6
Bypass Bypass:Envelope6 3/4, 7 With main tray paper
3/4,#9, #10,DL,C5,B5
Paper Weight Main Tray 16~24 lb.
Bypass 16~43 lb.
Paper Path Standard output Bottom to Top Front (FIFO)
Straight Through Face up, Single Sheet
Paper Size Max 216 x 356mm(8.5"x14")
Min 76 x 127mm(3"x5")
Compatibility DOS No
Service Manual
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Samsung Electronics
Product Specifications
2.2.6 Other Specification
Items SCX-4200 Remarks
Software O.S Win 2.x No *Dos(No)
Win 95 No
Win 98&WinME Yes
Win NT 4.0 No
Win 2000 Yes
Win XP Yes
Mac Yes Print, Scan
Linux Yes Print, Scan
Driver Printer SPL
TWAIN Yes
WIA Yes
Application RCP No Remote Control
Panel, Only for
upgrade FW
PC-FAX No Only available
through PC
Package and POP POP Yes
Quick Reference guide Yes
(include Setup Guide and
Function Guide)
Accessory Owner's manual Yes(Electronic)
S/W CD ROM 1 CD for User Manual, Smar
Thru 4, Print Driver, Scan
Driver, RCP
Toner Cartridge 1 EA
Power Cable 1 EA L-shape power cable
Telephone Jack No
Printer Cable No China,Korea : USB
Type One Piece
Consumables How to install Front door open and front
loading
Toner Life Initial 1Kpages
running 3Kpages
Toner Count Level Sensor No
Software Count Yes
Accessory Items
Service Manual
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Samsung Electronics
System Overview
3
3. System Overview
This chapter describes the functions and operating principles of the main components.
3.1 System Outline
3.1.1 Front View
Service Manual
3-1
Samsung Electronics
System Overview
3.1.2 Sensor
Service Manual
3-2
Samsung Electronics
System Overview
3.1.3 Control Panel
Service Manual
3-3
Samsung Electronics
System Overview
3.1.4 System Layout
SCAN PART
Paper Input (Cassette) Paper Empty Sensor (Manual)
Paper Input (Manual Feeder) Paper Empty Sensor (Cassette)
Paper Out (Face Down) Paper Feeding Sensor
Paper Out (Face Up) Paper Exit Sensor
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Samsung Electronics
System Overview
3.1.4.1 Paper Feed Mechanism
The printer has a universal cassette which automatically loads paper and a 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: Universal Cassette Type
- Feeding Standard: Center Loading
- Feeding Capacity: Cassette-250 sheets (75g/m2 , 20lb paper standard)
Manual 1 sheet (Paper, OHP, Envelop, etc.)
- Paper detecting sensor: Photo sensor
- Paper size sensor: None
3.1.4.2 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 15~30