Samsung ML-4550 Series User manual

DIGITAL LASER PRINT CONTENTS
[The keynote of Product]
- Series Model: ML-4550 / 4551N / 4551ND
- High speed Laser Printer:
Up to 43 ppm in A4 (45 ppm in Letter),
Duplex: 29 ipm (A4); 30 ipm (Letter)
- Resolution: Up to 1200 x 1200 dpi
- Marvell 500Mhz
- Memory: 128 MB (Max. 512 MB)
128, or 256 MB optional memory available.
Use only the Samsung-approved DIMM.
128 MB: ML-MEM150, 256 MB: ML-MEM160
- Option:
ML-4550:500-sheet trays, ethernet 10/100 Base
TX wired LAN, ethernet 10/100 Base
hard disk, duplex unit, DIMM
- Toner cartridge:
Starter: 10K or 20K pages
Consumable: 10K or 20K pages
- Duty cycle: Monthly Up to 150,000 pages
Manual
SERVICE
DIGITAL LASER PRINT
ML-4550 Series
ML-4550 / ML-4551N / ML-4551ND
Basic Model :ML-4550
ML-4551NR / ML-4551NDR

Contents
1. Precautions
1.1 Safety Warning 1-1
1.2 Caution for safety 1-2
1.2.1 Toxic material 1-2
1.2.2 Electric Shock and Fire Safety Precautions 1-2
1.2.3 Handling Precautions 1-3
1.2.4 Assembly / Disassembly Precautions 1-3
1.2.5 Disregarding this warning may cause bodily injury 1-4
1.3 ESD Precautions 1-5
2. Product Specifications
2.1 Product Overview 2-1
2.2 Specifications 2-1
2.2.1 General Specifications 2-1
2.2.2 Controller & S/W 2-2
2.2.3 Paper Handling 2-3
2.2.4 Consumables 2-4
2.2.5 Reliability & Service 2-4
2.2.6 Environment 2-4
2.2.7 Options 2-5
2.2.8 Others 2-5
2.3 Model Comparison Table 2-6
3. Summary of Product
3.1 Printer Components 3-1
3.1.1 Front View 3-1
3.1.2 Rear View 3-2
3.1.3 Control Panel 3-3
3.2 System Layout 3-7
3.2.1 Feeding 3-8
3.2.2 Transfer 3-9
3.2.3 Driver Ass'y 3-9
3.2.4 Fuser 3-9
3.2.5 LSU (Laser Scanner Unit) 3-9

Continue...
3.2.6 Print Cartridge 3-10
3.3 Engine H/W Specifications 3-11
3.3.1 ML-4550 (PCL) Main Board 3-11
3.3.2 SMPS & HVPS board 3-16
3.3.3 Engine F/W 3-20
4. Alignment and Adjustments
4.1 How to use EDC (Engine Diagnostic Control) Mode 4-1
4.1.1 EDC Setup 4-1
4.1.2 Entrance method for EDC 4-1
4.1.3 Cover Status 4-2
4.1.4 Sensor Status 4-3
4.1.5 Motor Test 4-5
4.1.6 Fan Test 4-5
4.1.7 Clutch / Sol 4-6
4.1.8 Fuser Ctrl 4-7
4.1.9 LSU 4-7
4.1.10 Deve Control 4-8
4.1.11 Print Test and Option version 4-9
4.2 Paper Path 4-10
4.2.1 Clearing Paper Jams 4-12
4.3 Sample Pattern 4-17
4.3.1 Information Pages 4-17
4.3.2 Demo Pages 4-17
4.4 Periodic Defective Image 4-18
4.5 Error Messages 4-19
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 Transfer Roller 5-2
5.3 MPF Ass’y 5-3
5.4 Holder Pad Ass'y 5-4
5.5 Retard Ass'y 5-5
5.6 Feed2 Idle Unit 5-6
5.7 Cover Right 5-7

Continue...
5.8 Main PBA 5-8
5.9 Main Drive Ass'y 5-9
5.10 DEVE Drive Ass'y 5-10
5.11 Connector PBA 5-11
5.12 Solenoid 5-12
5.13 Rear Cover 5-13
5.14 Cover Left 5-14
5.15 Top Cover 5-15
5.16 Open Cover 5-16
5.17 Inner Cover 5-17
5.18 Fuser Ass'y 5-18
5.19 Duplex Solenoid Ass'y 5-20
5.20 Exit Roller 5-21
5.21 LSU 5-22
5.22 DC Fan 5-23
5.23 Toner Sensor PBA 5-24
5.24 REGI Ass'y 5-25
5.25 MP Pick Up Ass'y 5-26
5.26 Pick Up & Feed2 Assy 5-28
5.27 Engine Shield 5-31
6. Troubleshooting
6.1 The cause and solution of Bad image 6-1
6.2 The cause and solution of the bad discharge 6-8
6.3 The cause and solution of the malfunction 6-13
6.4 Maintaining the toner cartridge 6-17
6.5 The cause and solutions of bad environment of the software 6-22
7. Exploded Views & Parts List
7.1 Main Assembly 7-2
7.2 Cover Assembly 7-5
7.3 Frame Assembly 7-7
7.4 Fuser Unit 7-12
7.5 REGI Assembly 7-14

Continue...
7.6 Main Motor Assembly 7-16
7.7 Deve Motor Assembly 7-18
7.8 Exit Sorenoid Assembly 7-20
7.9 Cassette Assembly 7-22
7.10 Duplex Unit 7-24
7.11 SCF Unit 7-26
8. Block diagram
8.1 System Block Diagram 8-1
9. Connection Diagram
9.1 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-1
10.2 DIMM board 10-17
10.3 CRUM board 10-19
10.4 EMPTY board 10-20
10.5 HVPS 10-21
10.6 Panel 10-25
10.7 SCF 10-26
10.8 Toner sensor 10-29
10.9 HDD.eps 10-30
11. Reference Information
11.1 Troubleshooting Tools 11-1
11.2 Acronyms and Abbreviations 11-2
11.3 Select a location for the printer 11-4
11.4 Sample Tests Patterns 11-5

Precautions
Samsung Electronics
Service Manual
1-1
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 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.

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 other wise
damaged. Do not place objects on top of the power cable. If the power cable is damaged it could overheat and
cause a fire or exposed cables could cause an electric shock. Replace a damaged power cable immediately,
do not reuse or repair the damaged cable. Some chemicals can attack the coating on the power cable,
weakening the cover or exposing cables causing fire and shock risks.
(8) Ensure that the power sockets and plugs are not cracked or broken in any way. Any such defects should be
repaired immediately. Take care not to cut or damage the power cable or plugs when moving the machine.
(9) Use caution during thunder or lightening storms. Samsung recommends that this machine be disconnected
from the power source when such weather conditions are expected. Do not touch the machine or the power
cord if it is still connected to the wall socket in these weather conditions.
(10) Avoid damp or dusty areas, install the printer in a clean well ventilated location. Do not position the machine
near a humidifier. Damp and dust build up inside the machine can lead to overheating and cause a fire.
(11) Do not position the printer in direct sunlight. This will cause the temperature inside the printer to rise possibly
leading to the printer failing to work properly and in extreme conditions could lead to a fire.
(12) Do not insert any metal objects into the machine through the ventilator fan or other part of the casing, it could
make contact with a high voltage conductor inside the machine and cause an electric shock.

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 22kg 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 22Kg, 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.

Specifications
Service Manual
2-1
Samsung Electronics
2
2
Item Descriptions Remark
Basic Model ML-4550
Series Model ML-4550, ML-4551N, ML-4551ND, ML-4551NDG(Kor.)
Maket of Sailes Office user Laser printer. (Network for work Group)
Specification 43ppm(Ltr. 45ppm), 500MHz Processor, 128MB Memory
10K(initial), 20K(sailes)
USB(Hight Speed USB 2.0), Network Option,
ML-4551N, ML-4551ND(Network base)
Face Down(250 sheets), Face Up(100 sheets)
2. Product Specifications
2.1 Product Overview
2.2 Specifications
Product Specifications are subject to without notice. See below for product specifications.
2.2.1 General Specifications
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Engine Speed Simplex Up to 43 ppm in A4 (45 ppm in Letter)
Duplex Option : 29 ipm in A4 (30 ipm in Letter)
Warmup time - Less than 45 sec : Power-on boot
FPOT From Ready Less than 8.5 sec
From Idle Less than 43.5 sec
From Coldboot Less than 53.5 sec
Resolution - Up to 1200 x 1200 dpi effective output

Service Manual
Specifications
2-2
Samsung Electronics
2.2.2. Controller & S/W
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Processor Marvell 500Mhz
Memory Std. 128 MB
Max. 512MB(256+256)
Printer Languages - PostScript3, PCL6, IBM ProPrinter, EPSON, PDF Direct(only HDD installed)
Fonts - 45 scalable, 1 bitmap, 136 PostScript 3 fonts, OCR Fonts
Driver Default Driver PCL6 : Win 95/98/NT4.0/2000/Me/XP(32/64bits)/2003 Server(32/64bits)
PS : Linux & Mac
Supporting OS Windows 95/98/NT4.0/2000/Me/XP(32/62bits)/2003 Server(32/62bits)
Various Linux OS including Red Hat 8~9, Fedora Core 1~3, Mandrake 9.2~10.1
and SuSE 8.2~9.2
Mac OS 8.6~9.2/10.1~10.4
WHQL Windows 2000, XP, 2003 Server
Wired Network Protocol N/A SPX/IPX, TCP/IP, SNMP, HTTP 1.1, AppleTalk
Supporting OS N/A Windows 98/ME/NT4.0/2000/XP(32/64bits)/2003
Server(32/64bits)
Netware 4.x, 5.x, 6.x
Mac OS 8.6~9.2, 10.1~10.4
Various Linux OS including Red Hat 8.0~9.2, Fedora
Core 1~3, Mandrake 9.2~10.1
and SuSE 8.2~9.2
Wireless Protocol N/A
Network
Supporting OS N/A
Application RCP N/A
Status Monitor N/A
Smart Panel YES (Include RCP and SM)
Network N/A
Management
Interface
Parallel - IEEE 1284
USB - High Speed USB 2.0
Wired Network - Optional 10/100 Base TX
Wireless Network - N/A
User Interface
LCD - 16 x 12 Character LCD
LED - 2LED(Status LED, Save Button LED)
Key - 8 Key: Menu , , OK (*) , , Back Toner Save , Demo , Stop

Specifications
Service Manual
2-3
Samsung Electronics
2.2.3. Paper Handling
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Standard - 500-sheet Cassette Tray, 100-sheet Multi Purpose Tray @75g/
Capacity
Max. Capacity - 2,100 sheets @75g/
Printing Max. Size 216 x 356 mm (8.5" x 14")
Min. Size 76 x 127 mm (3.0" x 5.0")(>105g)
Multi-purpose tray
Capacity - 100 sheets @75g/
Media sizes - A4, A5, A6, Letter, Legal, Oficio, Folio, Executive,ISO B5, JIS B5, 3"x5", Monarch,
No.10, DL, C5, C6
Media type - Transparencies, Envelopes, Labels, Card stock
Media weight - 16~43 lb (60 to176g/ )
Sensing - Paper empty sensor
Standard Cassette Tray
Capacity - 500 sheets @ 75g/
Media sizes - A4, A5, Letter, Legal, Executive, Folio, Oficio, ISO B5, JIS B5
Media types - Plain Paper
Media weight - 16~28lb (60 to 105g/ )
Sensing - Paper empty sensor, Paper Size Sensor
Second Optional
Cassette Tray
Capacity - 500 sheets @ 75g/
Media sizes - A4, A5, Letter, Legal, Executive, Folio, Oficio, ISO B5, JIS B5
Media types - Plain Paper
Media weight - 16~28lb (60 to 105g/ )
Sensing - Paper empty sensor, Paper Size Sensor
Third Optional
Cassette Tray
Capacity - 500 sheets @ 75g/
Media sizes - A4, A5, Letter, Legal, Executive, Folio, Oficio, ISO B5, JIS B5
Media types - Plain Paper
Media weight - 16~28lb (60 to 105g/ )
Sensing - Paper empty sensor, Paper Size Sensor
Output Stacking
Capacity Face-Down 250 sheets @ 75g/
Face-Up 100 sheets @ 75g/
Output Full sensing - Paper full Sensor
Optional Stacker
Capacity Face-Down N/A
Duplex - Optional Built-in
Supporting
Media sizes - A4, Letter, Legal, Folio, Oficio
Media types - Plain Paper
Media weight - 20~24lb (75~90g/ )

Service Manual
Specifications
2-4
Samsung Electronics
2.2.4. Consumables
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Toner Black Standard 10K pages @ ISO 19752 standard Coverage
High Yield 20K pages @ ISO 19752 standard Coverage
Key Electronic key(CRUM)
Life detect Toner remaining volume would be traced via software
Drum Yield Same as consumables
2.2.5. Reliability & Service
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Printing Volume - 5,000 sheets / month
(SET AMPV)
Max. Monthly - 150,000 sheets
Duty
MPBF - 150,000 sheets
MTTR - 20 min.
SET Life Cycle - 500,000 sheets or 5 years (whichever comes first)
2.2.6. Environment
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Acoustic Noise Printing Less than 57.0 dBA
Level(Sound
Power/Pressure)
Standby Less than 35.0 dBA
Sleep Back Ground Level
Power AVG. Less than 650W
Consumption
Sleep/Power Off Less than 13W
Dimension SET 396 x 453 x 353 mm (15.6" x 17.8" x 13.9") 396 x 501 x 353 mm
(W x D x H) (15.6" x 19.7" x 13.9")
SET Packing 518 x 566 x 568 mm (External)
CRU 314 x 242 x 138 mm
Toner Packing 370 x 286 x 180 mm (External)
Weight SET 17.8kg(39.2 Ib) 19.1kg
Toner(10K) 10K : 1.85kg(4.08 Ibs), 20K : 2.06kg(4.54 Ibs)
Gross 21.6kg(47.62 Ibs) 23.5kg(51.81 Ibs)

Specifications
Service Manual
2-5
Samsung Electronics
2.2.7. Options
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Memory - 128MB/512MB (256MB+256MB)
Second Cassette - 500 sheet Cassette Tray
Third Cassette - 500 sheet Cassette Tray
Stacker - N/A
Stapler N/A
PostScript - Default
Wired Network - Ethernet 10/100 Base Default Default
TX (Internal)
Hard Disk - 40GB
Duplex Unit - Optional Default
2.2.8. Others
ITEM ML-4550 SERIES
ML-4550 ML-4551N ML-4551ND
Performance Jam Rate Base Line Paper : 1/12K
Requirement
Standard Paper : 1/10K
Stress Paper : 1/1500

2.3 Model Comparison Table
Project SEC HP Lexmark Brother Dell
Model Name ML-4550 LJ-4250 T642 HL-8050N W5200N
Engine
FPOT 8.5 sec 8 sec 8.5 sec 9 sec 8.5 sec
Speed(ppm) 43ppm (Ltr. 45ppm) 43ppm (Ltr. 45ppm) 43ppm (Ltr. 45ppm) 34ppm (Ltr. 35ppm) 43ppm (Ltr. 45ppm)
Resolution 1200 dpi 1200 dpi 1200 dpi x 1200 dpi 1200dpi x 1200 dpi 1200 dpi x 1200 dpi
Noise(dB)
57dB(Printing), 35dB(Idle) not_inform 55dB(Printing), 30dB(Idle) 54dB(Printing), 27dB(Idle) 55dB(Printing), 34dB(Idle)
Weight 17.83kg 20.2kg (45 lbs) 23.1Kg (51lbs) 20.6Kg (45.2 lbs) 45lbs
Demension(W*D*H) 15.6 x 17.8 x 13.9 16.5 x17.8 x14.8 436x523x406mm 16.6 x 18.3 x 15.9 (17.2 x20.2 x16 )
396 x 453 x 353 mm 418x451x377mm (17.2 x20.6 x16 )
Control
Processor 500MHz 460MHz 457 MHz RISC 300MHz 500 MHz RISC
Ram(Std.) 128MB 48MB 64MB 64MB 80MB
Ram(Max.) 512MB 512MB 576MB 576MB 336MB
Emulation PCL6, PS3 PCL6, PS3 PCL6, PS3 PCL6, PS3, PCL6, PS3,
10/100 Base TX 10/100 Base TX
Interface IEEE1284, USB 2.0 IEEE1284, USB 2.0 IEEE1284, USB 1.1 IEEE1284, USB IEEE1284, USB
2.010/100 Base TX 2.010/100 Base TX
Optional Interface 10/100 Base TX 10/100 Base TX 10/100 Base TX N/A N/A
Paper Handling
Paper Input(Capa./Type) 500 Sheets 500 Sheets 500 Sheets 550 Sheets Cassette 500 Sheets
Cassette100 MP Tray Cassette100 MP Tray Cassette100 MP Tray 150 Sheets Cassette Cassette100 MP Tray
Paper Output 250 Sheets Face down 250 Sheets Face down 500 Sheets Face Down 500 Sheet Face down 250 Sheets Face Down
100 Sheets Face up 70 Sheet Face up
Others
Max.Monthly Duty 150,000 sheets 200,000 sheets 225,000 sheets - 225,000 sheets
Consumable Yeild Standard 10K Standard 10K Standard 6K 17K Standard 18K
High Yield 20K High Yield 20K High Yield 21K High Yield 27K
Power Consumption
Printing : Less than 650 W Printing : 680 W not_inform Printing: < 593W not_inform
Sleep : under 13 W Sleep : under 20 W Sleep:< 12W
Duplex Option Option Option Option NO
Options
- Memory (128MB/256MB) - Memory - 250 sh duplexer - SCF - duplexer
- 3x500 sheet SCF - 500 sheet SCF - 3x250 sh drawer - Memory - 85 envelope
- Duplex - Duplex
- 2000 sh drawer(Max.3850) - Stand feeder
- 40GB HD - HP Jetdirect
- 85 sh envelope feeder - Sorter/Mail box - 500 sheet cassette
- 20GB HD
- 650 sh output expander - 250 sheet cassette
- Stacker & Stapler
- 1850 sh High capacity
output stacker
- 40 sheet staple
- 5 bin mailbox
(5x120 sh )
Specifications
2
Samsung Electronics
Service Manual
Specifications
2-6
Samsung Electronics

ACCE
SSO
R
Y
It
em
C
ode Quantit
y
JC99-01974E
3903-000042
6902-000288
JC46-00280A
JC46-00293A
JC68-00690A
JC68-01579A
INA-ACCESSORY
CBF-POWER CORD
BAG PE
S/W APPLICATION-CD
S/W APPLICATION-CD
MANUAL-(CARD)WARRANTY CARD
MANUAL-NETWORK GUIDE
LABEL(P)-BLANK 90*25 JC68-01584A
Specifications
Service Manual
2-7
Samsung Electronics

Summary of Product
Service Manual
3-1
Samsung Electronics
3
3
3. Summary of Product
This chapter describes the functions and operating principal of the main component.
3.1 Printer Components
3.1.1 Front View

Service Manual
Summary of Product
3-2
Samsung Electronics
3.1.2 Rear View

Summary of Product
Service Manual
3-3
Samsung Electronics
3.1.3 Control Panel
The control panel on the top right side of your printer has the display and the nine buttons.
3.1.3.1 Display