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DIGITAL LASER MFP
SCX-4100
SERVICE 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
This service manual is also provided on the web, © Samsung Electronics Co.,Ltd. May 2004
the ITSELF system f Samsung Electronics Co., Ltd. Printed in Korea.
http://itself.sec.samsung.co.kr VERSION NO. : 1.00 CODE : JC-0125A
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 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
con-forming 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
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 cause an
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 taking off the power plug. The power plug has to be inserted completely. If not,
a fire will be caused due to poor contact. When taking off the power plug, grip the plug and remove it.
(7) Take care of the power cable. Do not allow it to become twisted, bent sharply round corners or other wise
damaged. Do not place objects on top of the power cable. If the power cable is damaged it could overheat and
cause a fire or exposed cables could cause an electric shock. Replace a damaged power cable immediately,
do not reuse or repair the damaged cable. Some chemicals can attack the coating on the power cable,
weakening the cover or exposing cables causing fire and shock risks.
(8) Ensure that the power sockets and plugs are not cracked or broken in any way. Any such defects should be
repaired immediately. Take care not to cut or damage the power cable or plugs when moving the machine.
(9) Use caution during thunder or lightening storms. Samsung 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.
Service Manual
1-2
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) 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 cause 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 Toner Cartridge
- 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
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.
Take care when using a printer. It contains many rotating parts. Ensure that fingers, hair, clothing etc. do not
become caught in the mechanism as this could cause injury.
(3) When you move the printer.
This printer weighs 8.8kg 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 8.8Kg, 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
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.
Service Manual
1-5
Reference Information
2
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 tests pages is also included.
2.1 Tool for Troubleshooting
The following tools are recommended for safe and smooth troubleshooting described in this service manual.
1 DVM(Digital Volt Meter)
Standard: Indicates more than 3 digits. 5 Cleaning Equipments
Standard : An IPA(Isopropyl Alcohol)dry
wipe tissue or a gentle neutral
detergent and lint-free cloth.
6 Vacuum Cleaner
2 Driver
Standard : "-" type, "+" type (M3 long, M3
short, M2 long, M2 short).
7 Spring Hook
Standard : For general use
3 Tweezers
Standard : For general home use, small
type.
8 Software(Driver) installation CD ROM
4 Cotton Swab
Standard : For general home use, for
medical service.
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Samsung Electronics
Reference Information
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.
ADC Analog-to-Digital-Conversion FCOT First Copy Out Time
AP Access Point FFC FLexiable FLat Cable
AC Alternating Current LAN local area network
ASIC Application Specific Integrated Circuit LBP Laser Beam Printer
ASSY Assembly EPP Enhanced Parallel Port
BIOS Basic Input Output System F/W Firmware
BLDC Motor Brushless DC Motor FCF/FCT First Cassette Feeder/First
Cassette Tray
CIS Contact Image Sensor
FISO Front-In, Side-Out
CMOS Complementary Metal Oxide
Semiconductor FPOT First Print out Time
CN Connector GDI Windows Graphic Device Interface
CON Connector GIF Graphic Interchange Format
CPU Central Processing Unit GND Ground
dB Decibel HBP Host Based Printing
dBA A-Weighted decibel HDD Hard Disk Drive
dBm Decibel milliwatt HTML Hyper Text Transfer Protocol
DC Direct Current HV High Voltage
DCU Diagnostic Control Unit HVPS High Voltage Power Supply
DIMM Dual In-line Memory Module I/F Interface
DPI Dot Per Inch I/O Input and Output
DRAM Dynamic Random Access Memory lb Pound(s)
DVM Digital Voltmeter IC Integrated Circuit
ECP Enhanced Capability Port ICC International Color Consortium
ECU Engine Control Unit IDE Intelligent Drive Electronics or
Integrated Drive Electronics
EEPROM Electronically Erasable
Programmable Read Only Memory IEEE Institute of Electrical and
Electronics Engineers. Inc
EMI Electro Magnetic Interference
IOT Image Output Terminal (Color print-
EP Electro photographic er, Copier)
EPP Enhanced Parallel Port IPA Isopropy Alcohol
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Samsung Electronics
Reference Information
IPC Inter Process Communication RAM Random Access Memory
IPM Images Per Minute ROM Read Only Memory
LCD Liquid Crystal Display SCF/SCT Second Cassette Feeder/Second
Cassette Tray
LED Light Emitting Diode
SMPS Switching Mode Power Supply
LSU Laser Scanning Unit
SPGP Samsung Printer Graphic
MB Megabyte Processor
MFP Multi-Functional Product SPL Samsung Printer Language
MHz Megahertz Spool Simultaneous Peripheral Operation
Online
MPBF Mean Prints Between Failure
SURF Surface Rapid Fusing
MPF/MPT Multi Purpose Feeder/Multi
Purpose Tray SW Switch
NIC Network Interface Card sync Synchronous or Synchronization
NPC Network Printer Card T1 ITB
NVRAM Nonvolatile Random Access T2 Transfer Roller
Memory
TBD To Be Determined
OPC Organic Photo Conductor
TRC Toner Reproduction Curve
PBA Printed Board Assembly
TTM Time to Market
PCL Printer Command Language ,
Printer Control Language PnP Universal Plug and Play
PCI Peripheral Component UMC Unit Manufacturing Cost
Interconnect by Intel 1992/6/22, is
a local bus standard developed by URL Uniform Resource Locator
Intel and introduced in April, 1993 :
USB Universal Serial Bus
A60, B60 Pins
VCCI Voluntary Control Council for
PDF Portable Document Format Interference Information
PDL Page Description Language Technology Equipment
Ping Packet internet or Inter-Network WECA Alliance Wireless Ethernet Compatibility
Groper
Wi-Fi Wireless Fidelity
PPD Postscript Printer Discription
PPM Page Per Minute
PS Post Script
PTL Pre-Transfer Lamp
PWM Pulse Width Moduration
Q'ty Quantity
QCD Quality, Cost, and Delivery
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Samsung Electronics
Reference Information
2.3 Select a location for the printer
· Leave enough room to open the printer trays, covers, and allow for proper ventilation. (see diagram
below)
· Provide the proper environment :
- A firm, level surface
- Away from the direct airflow of air conditioners, heaters, or ventilators
- Free of extreme fluctuations of temperature, sunlight, or humidity
- Clean, dry, and free of dust
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Samsung Electronics
Reference Information
2.4 The Sample Pattern for the Test
The sample pattern shown in below is the standard pattern used in a factory.
The contents of the life span and the printing speed are measured with the pattern shown in below.
(The picture in the manual is 70% size of the actual A4 size.)
2.4.1 A4 5% Pattern
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Reference Information
2.4.2 A4 2% Pattern
Service Manual
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Samsung Electronics
Reference Information
2.4.3 A4 IDC 5% Patten
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Reference Information
MEMO
Service Manual
2-8
Samsung Electronics
Specifications
3
3. Specifications
Specfications are correct at the time of printing. Product specifications are subject to change without notice.
See below for product specifications.
3.1 General Specifications
General
Items
Major Features
SCX-4100
Copier,Print,Scan
Remarks
Size (W*D*H) 16.6"x15.8" x9.4"
(422x400x239mm)
Net Weight(Inc. Toner Cartridge) 0.69 Kg
Net Weight(exc. Toner Cartridge) 8.89 Kg
Gross Weight(with package) 12.04 Kg
LCD 16*2 Char No BackLite
I/O Interface USB1.1 & IEEE1284
Power Printing Operation 300 Wh
Consumption Sleep Mode Energy Star Compliant
Power Switch Yes
Noise Operating 49 dBA
Standby 38 dBA
Warm Up Time from Cold Status Less than 42 seconds
Machine Life Max. Monthly Volume Print 10,000pages
(Duty Cycle) Scan 2,000pages
Average Monthly Print Volume 500 Pages
Machine Life 5 years, 100000 Pages
Whichever comes first.
Approval Class B
Device Memory 8MB
Internal N/W Option N/A
Page Counter Yes
Print Configuration Yes
Sheet
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Samsung Electronics
Specifications
3.2 Print Specification
Items SCX-4100 Remarks
PRINT Print Speed 15ppm/Ltr, 14ppm/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. 12 seconds
From Cold Status Less than 54 seconds
Duplex Print N.A
Printable Area 208 x 273 mm (Letter)
Halftone(Gray Scale) 256 levels
3.3 Scan Specification
Items SCX-4100 Remarks
SCAN Scan Method Color CIS
Scan Speed through Lineart, Halftone 72 sec
Platen Gray 72 sec
Color 40sec/150 sec
75dpi/300dpi
Resolution Optical 600*600dpi
Enhanced 4800dpi*4800dpi (USB)
2400dpi*2400dpi(Parallel)
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
Specifications
3.4 Copy Specification
Items SCX-4100 Remarks
COPY Copy Quality Selection or Text 600x300dpi
Original Image type Text/Photo 600x300dpi
selection Mode Photo 600x600dpi for Platen
FCOT Stand by Approx. 12 seconds
From Cold Status Less than 54 seconds
Copy Speed / Letter SDMC at all mode 15cpm/Ltr. 14cpm/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)
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Samsung Electronics
Specifications
3.5 Paper Handiling Specification
Items SCX-4100 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
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Samsung Electronics
Specifications
3.6 Other Specification
Items SCX-4100 Remarks
Software WHQL Win 3.x No
Win 95 Yes
Win 98&WinME Yes
Win NT 4.0 Yes
Win 2000 Yes
Win XP Yes
Mac Yes Mac Printer Only
Linux Yes Print, Scan
Printer Yes Printer driver only
for WinXP
WIA Scanner No
Driver Printer SPL
Package TWAIN Yes
WIA No
RCP Yes Remote Control
Panel, Only for
upgrade FW
PC-FAX No Only available
through PC
Offset BOx
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
Russia : Parallel
cable
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 No
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Samsung Electronics
Specifications
MEMO
Service Manual
3-6
Samsung Electronics
Summary of product
4
4. Summary of Product
This chapter describes the functions and operating principles of the main component.
4.1 Printer Components
4.1.1 Front View
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Samsung Electronics
Summary of Product
4.1.2 Rear View
Service Manual
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Samsung Electronics
Summary of product
4.1.3 Control Panel
Service Manual
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Samsung Electronics
Summary of Product
4.2 System Layout
SCAN PART
Service Manual
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Samsung Electronics
Summary of product
4.2.1 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
4.2.2 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 60,000 sheets (at 15~30°C)
4.2.3 Drive Ass'y
A gear driven power unit. The motor supplies power to the paper feed unit, the fuser unit, and the toner cartridge.
4.2.4 Fixing Part(Fuser)
There are two types of fuser unit:
Q-PID type, developed by Samsung, and only used on 220V Domestic models
Heat Lamp type used on 220V Export models and all 110V models.
The Heat Lamp type 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.
4.2.4.1 Heat Lamp power cut-off (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.
4.2.4.2 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.
4.2.4.3 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.
4.2.4.4 Pressure roller
The Pressure Roller mounted under the heat roller, it is made of a silicon resin, and the surface of the roller is
tubed with Teflon. This ensures that toner does not adhere to the roller surface.
Service Manual
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Samsung Electronics
Summary of Product
4.2.4.5 Safety Relevant Facts
· 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 80ºC to protect the user and a
caution label is attached where the customer can see it easily when the rear cover is opened.
4.2.5 Scanner Unit
· Scan Image Controller
1.Scan Line Time : 1.67ms
2.Scan Resolution : Color : Max 600DPI
3.Scan Width : 216mm
4.Function
- White Shading Correction
- Gamma Correction
- CIS Interface
- 256 Gray Scale
· CIS Driver Circuit
- CIS Clock : 4.16MHz
- Voltage Reference : 1.1V
- CIS Line Time : 1.67ms/Line x 3Color(600dpi)
· Scan Motor Driver Circuit
- Motor Driver : SIA403A
- Used Volt : 24V DC
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Samsung Electronics
Summary of product
4.2.6 LSU (Laser Scanner Unit)
This is the core of the laser printer. It converts the video data received from the computer into an electrostatic
latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the
surface of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the OPC and each
side of the mirror is one scan line. The OPC drum turns as the paper feeds to scan the image down the page.
The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and this
signal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on
paper. In other words after the /HSYNC signal is detected the image data is sent to the LSU to adjust the left margin
on the paper.
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Samsung Electronics
Summary of Product
4.2.7 Toner Cartridge
The toner cartridge is an integral unit containing the OPC unit and toner unit. The OPC unit consists of the OPC
drum and charging roller, and the toner cartridge unit consists of the toner, supply roller, developing roller, and
blade (Doctor blade)
- Developing Method: Non magnetic 1 element contacting method
- Toner: Non magnetic 1 element shatter type toner
- The life span of toner: 3,000 sheets (IDC Pattern/A4 standard)
- Toner remaining amount detecting sensor: No
- OPC Cleaning: Electrostatic process
- Management of waste toner: Electro static process(Cleanerless Type)
- OPC Drum protecting Shutter: No
- Classifying device for toner cartridge: ID is classified by interruption of the frame channel
0.22mW
-330V
-970V
-480V
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Samsung Electronics
Summary of product
4.3 Main PBA
The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU, printer
scanner and line control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC inter-face.
The main board sends the Current Image Video data to the LSU and manages the Electrophotographic printing
process. Circuits on the PBA drive include the main motor (paper feed, cartridge, fuser), clutch driver, pre-transfer
lamp driver, heat-lamp driver, CIS driver, scan motor driver and fan driver.
The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from
the power supply PBA.
MEMORY (U69)
FLASH
DRIVER (U15)
MOTOR
SDRAM
(U7)
REGULATOR
(3.3V) (U3)
EMI ATTENUATOR
(U13)
PROCESSOR
ASIC (U5)
GRAPHIC
CRYSTAL
(OSC2)
REGULATOR
(1.8V) (U2)
COMPARATOR
(U16)
TRANSCEIVER
(U9)
SUPER 1284
(U11)
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Summary of Product
4.3.1 ASIC (Chorus2)
The Chorus2 (16Bit RISC Processor) ASIC is the main processor controlling the whole system. It controls
all of the printing and scanning functions using a system program stored in flash memory.
·Main function block
· Completely Integrated System for Embedded Applications,
· 16/32 Bit Risc Architecture, Efficient and Powerful ARM7TDMI CPU
· LSU Interface Module for Interfacing PVC with LSU
· 5 Channel General Purpose DMA Controller for High Speed I/O
· Dual Memory Bus Architecture
· Operating frequency : 66MHz
· Operating power : 1.8V(internal), 3.3V(external)
4.3.2 Flash Memory
This stores the system program. Firmware upgrade is achieved by downloading from the new image using the PC
Interface.
· Capacity : 1M Byte
· Access Time : 70 nsec
4.3.3 SDRAM
This is used as a buffer, system working memory area, etc. while printing and scanning.
· Capacity :
SCX-4100
8 M byte
· Access Time : 15 nsec
4.3.4 Sensor input circuit
1) Paper Empty Sensing
The Paper Empty sensor (Photo Interrupter) on the SMPS/HVPS PBA is monitored by the CPU.
When the cassette is empty the printer displays a message on the LCD panel.
2) MP Sensing
Presence of paper in the MP tray is detected by operation of the MP Sensor (Photo Interrupter) on the
SMPS/HVPS PBA. The CPU monitors this signal to recognize paper in the MP, and paper is fed from MP if
there is paper present.
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Summary of product
3) Paper Feeding, Toner Cartridge Sensing
When paper passes the actuator on the feed sensor, it is detected by the Photo interrupter.
Signal (nP_FEED, PIN 186) monitored by the CPU and this signal starts the process of creating the image after certain
delay time If the feed sensor is not detected within 1 sec. after paper is fed, a paper Jam0 occurs. (Displayed on the
LCD panel).
When a toner cartridge is inserted it also operates the Paper Feed sensor. A message is displayed on the LCD id no
cartridge is detected.
4) Paper Exit Sensing
This detects that paper exits cleanly from the set using an exit sensor on the engine board and actuator on the frame.
The monitors signal (P_EXIT, PIN 84) and detects the on/off time of the exit sensor and if jam status is detected then
JAM2 is displayed the on the LCD panel.
5) Cover Open Sensing
The Cover open sensor actuator is located on the front cover and the senor is in the main frame.
When the front cover is open the +24V and +5V supplies to the DC fan, solenoid, main motor, polygon motor part of
LSU, HVPS and LSU Laser diode are cut off. The CPU monitors signal (COVER_OPEN, GPIO_11) to recognize when
the cover is open.
6) DC FAN / SOLENOID Driver
It is driven by a transistor and controlled by signal (FAN, GPIO_7; Main Clutch Solenoid:PIN 185,MP Clutch Solenoid:
PIN 184) bit of the CPU.
When it is high the fan is activated by turning on the TR, and it is off when the sleep mode is selected. There are three
solenoids and these are driven by the Paper Pick-up, Regi and MP signals. The diode protects the driving TR from the
Back-EMF pulse which is generated when the solenoid is de-energized.
7) Motor Driver
The motor driving circuit is activated when the Driver IC is enabled. An AN44060 (Motor driver IC) is used in this case.
The resistance Rs value of sensing and the voltage value of the V reference can be changed by the motor driving volt-
age value.
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Summary of Product
4.4 SMPS & HVPS
The SMPS and HVPS are on one integrated board.
The SMPS supplies the DC power to the system. It takes either 110V or 220V and outputs the +5V and 24V
supplies to the main and other PBAs.
The HVPS creates the high voltage of THV/MHV/Supply/Dev and supplies it to the toner cartridge. The CPU is
used to modify some of these voltage settings to provide the ideal voltages to create the image.
The HVPS part uses the 24V and outputs the high voltage for THV/MHV/BIAS and the outputted high voltage is
supplied to the toner, OPC cartridge and transfer roller.
F1 F2 CN3 CN4
110V : 125V/8A 110V : 125V/3A (FAN CON.) (PANEL CON.) THV
220V : 250V T 5A H 220V : 250V 2A H
CN1
(H/L CON.) DEV
MHV OPC SUPPLY
COVER OPEN SWITCH
MANUAL SENSOR
FEED SENSOR
PAPER-EMPTY SENSOR
EXIT SENSOR MAIN PBA CON. F101
250V L2A
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Summary of product
4.4.1 HVPS(High Voltage Power Supply)
1) Transfer High Voltage (THV+)
- Function : It is this voltage that transfers toner from the OPC Drum to the paper.
- Output voltage : Maximum +5000V ±5% (no load, variable duty cycle)
- Error : IF THV (+) is not present, low density printing occurs due to toner on the OPC Drum not being
transferred to the paper. It is possible that waste toner over-flow can occur if this condition persists.
Ghost images may appear which repeat at 76mm intervals.
2) Charge Voltage (MHV)
- Function : It is this voltage that charges the surface of the OPC to -900V ~ -1000V.
- Output voltage : -1300V ~ -1800V DC ± 50V
- Error : IF MHV is not present toner then since the OPC drum surface has no charge toner is attracted to the
whole OPC surface. A black page is printed out when this happens.
3)Cleaning Voltage (THV-)
- Function : It removes toner contamination from the rear side of the paper by sending (-) polarity to the transfer
roller forcing toner to transfer back to the to OPC drum.
- Output Voltage : -1000VDC, +300V/-150V
- Error : Smudges and toner contamination on the reverse side of the printed page.
4) Developing Voltage (DEV)
- Function: It is this voltage that develops toner with on to the section of the OPC drum surface exposed by the
LSU (Laser Scanning Unit).
* When printing the exposed voltage on the OPC is -180V, unexposed is -970V, and the exposing voltage on
the DEV is -330V. Therefore toner with (-) polarity is developed onto an exposed section of the OPC.
- Output voltage: -200V ~ 600V DC ± 20V
- Error: a) If DEV is GND, print density gets extremely low.
b) When DEV is floating due to poor connection between the frame and cartridge contacts etc., print
density gets extremely high.
5) Supply Voltage (SUP)
- Function: It is this voltage that supplies toner to the developing roller.
- Output voltage: : -350V ~ -750V DC ± 50V (Use ZENER)
- Error: a) When SUP is GND print density gets extremely low.
b) If SUP is floating due to poor connection between the frame and cartridge contacts etc.
density gets extremely low such that it is hard to see toner with the eyes
6) OPC Ground ZENER Voltage
- Function: It is this voltage that prevents image contamination under low temperature and low humidity
environment conditions.
- When a set prints without an output voltage, -130V DC ± 15V is maintained on OPC ground. (-130V ZENER
diode is connected to OPC ground)
- Error type: a) When the ZENER diode is - 0V there is no serious image problem in general environment, but
in low temperature and low humidity environments it is possible that contamination can occur on
the entire image
b) When the ZENER diode is disconnected a blank page is printed out. (It is the same when a
ZENER diode is disconnected from OPC ground.)
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Summary of Product
4.4.2 SMPS (Switching Mode Power Supply)
This is the power source for the whole system. It is an independent module so that it is possible to use it for
common use. It is mounted at the bottom of the set.
It consists of the SMPS section, which supplies the DC power to drive the system, and the AC heater control part,
which supplies the power to the fuser. The SMPS has four output channels (+5V, +3.3V, +3.3VS and +24VS).
There are three kinds of power, 120V exclusive (America), 220V exclusive (Europe), and 220V for China (nations
with unstable power supply).
1) AC Input
- Inputting rated voltage : AC 220V ~ 240V AC 100~127V
- Inputting voltage fluctuating range : AC 198V ~ 264V AC 90V ~ 135V
- Rated frequency : 50/60 Hz
- Frequency fluctuating range : 47 ~ 63 Hz
- Inputting Current : Under 4.0Arms/2.0Arms (when heat lamp is off)
2) Rated Power Output
NO Item CH1 CH2 CH3 Remark
1 Channel name +5V +24V +24.0VS
2 Connector Pin CON 4 CON 4 CON 4
5V PIN: 3, 4, 23 24V PIN : 14 24V PIN: 11, 12
GND PIN: 5, 6 GND PIN: 8, 9, 10 GND : 8, 9, 10
3 Rated Output Voltage +5V ± 5% +24V - 10/15% +24VS - 10/15%
(4.75 ~ 5.25V) (21.6 ~ 27.46V) (21.6 ~ 27.46V)
4 Max. Output current 1.0 A 0.5A 1.0 A
5 Peak Loading voltage 1.5 A 1.0A 1.5 A 1ms
6 Ripple noise voltage Under 150m Vp-p Under 500m Vp-p Under 500m Vp-p
7 Maximum output 5.0W 12W 24W
3) Consumption Power
NO Item CH1 CH2 CH3 System
(+5V) (+24V) (+24VS)
1 Stand-By 0.2 A 0.07A 0.07 A AVG : 60 Wh
2 PRINTING 1.0 A 0.5A 1.0 A AVG : 300 Wh
3 Sleep-Mode 0.2A 0.02A 0.03A AVG : 10 Wh
4) Length of Power Cord : 1830 ± 50mm
5) Power Switch : Fitted
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Summary of product
6) Feature
- Insulation resistance : over 50M (at DC500V)
- Insulation retest pressure : Must be no problem within 1min. (at 1500Vzc, 10mA)
- Leakage voltage : under 3.5mA
- Running voltage : under 40A peak (at 25°c, Cold start) Under 60A peak (in other conditions)
- Rise Time : Within 2Sec
- Fall Time : Over 20ms
- Surge : Ring Wave 6KV-500A (Normal, Common)
7) Environment Condition
- Operating temperature range : 0°c ~ 40°c
- Storage temperature range : -25°c ~ 85°c
- Storage humidity range : 30% ~ 90% RH
- Operating atmospheric pressure range : 1
8) EMI Requirement : CISPR ,FCC, CE, MIC, C-Tick,
9) Safty Requrement
- IEC950 UL1950, CSA950, C-UL,Semko,iK,CB, CCC(CCIB),GOST, EPA,
4.4.3 Fuser AC Power Control
The Fuser (HEAT LAMP) is heated using AC power. The AC power is controlled by a Triac (THY1), a semiconductor
switch. 'On/Off control' is achieved when the gate of the Triac is turn