Samsung ML-4050N Service Manual

DIGITAL LASER PRINT The keynote of Product

Upgrade to Speed_up model(ML-4050N)
of the ML-3560 series

1. Printing speed :

- 38 ppm in A4 (40 ppm in Letter)

- Duplex: 26 ipm (A4); 27 ipm (Letter)

2. Resolution : Up to 1200 x 1200 dp

3. CPU : 400MHz

4. Memory : 64 MB (Max. 512 MB)

5. Interface : USB 2.0 & IEEE1284

- Ethernet 10/100 Base TX

6. Toner cartridge :

- initial(10K) / sales(20K)

7. Option :

- 802.11 b/g Wireless LAN

- Optional Duplex

- Optional 500 sheet SCF

- Optional Hard Disk

Manual

SERVICE

DIGITAL LASER PRINT
ML-4050 Series

ML-4050N/XAA

Basic Model :ML-4050N

Contents

1. Precautions

2. Product Specifications and Feature

3. Disassembly and Reassembly

4. Alignment and Adjustments

5. Exploded Views and Parts List

6. System Diagram

7. Reference Information

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 GEÖFFNET. 
NICHT DEM STRAHL AUSSETZEN.

ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS 

D’OUVERTURE. EXPOSITION DANGEREUSE 
AU FAISCEAU.

ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI 

APERTURA. EVITARE L’ESPOSIZIONE AL 
FASCIO.

PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE. 

EVITAR EXPONERSE AL RAYO.

ADVARSEL. - USYNLIG LASERSTRÅLNING VED ÅBNING, NÅR 

SIKKERHEDSBRYDERE ER UDE AF FUNKTION. 
UNDGÅ UDSAETTELSE FOR STRÅLNING.

ADVARSEL. - USYNLIG LASERSTRÅLNING NÅR DEKSEL 

ÅPNES. STIRR IKKE INN I STRÅLEN. 
UNNGÅ EKSPONERING FOR STRÅLEN.

VARNING - OSYNLIG LASERSTRÅLNING NÄR DENNA DEL 

ÄR ÖPPNAD OCH SPÄRREN ÄR URKOPPLAD. 
BETRAKTA EJ STRÅLEN. STRÅLEN ÄR FARLIG.

VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA 

OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASER-
SÄTEILYLLE ÄLÄ KATSO SÄTEESEEN.

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 21kg 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 21Kg, 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 avail­able wrist strap device, which should be removed for your personal safety reasons prior to applying power to the
unit under test.

2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface, such as
aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity of the assem­bly.

3. Use only a grounded tip soldering iron to solder or desolder ESDs.

4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static” can
generate electrical charges sufficient to damage ESDs.

5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to dam­age ESDs.

6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a compa­rable conductive material.

7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch the pro­tective material to the chassis or circuit assembly into which the device will be installed.

8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed, until com­pletely plugged or soldered into the circuit.

9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the brushing
together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electricity sufficient to
damage an ESD.

Product specification and feature

Service Manual

2-1

Samsung Electronics

2

2

2.1.2 Specifications

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

2.1.2.1 General

ITEM ML-4050N REMARK

Major Features Default N/W Print
Technology Electro-photography
Dimension(W*D*H) Net Dimension w/o Option Tray 396*453*353mm (15.6"*17.8"*13.9") (External)

Packing Dimension w/o option tray 518*566*568mm (20.4"*22.3"*22.4") (External)
Net Dimension with Option Tray 396*453*501mm (15.6"*17.8"*19.7") (External)
Toner 314 x 225 x 116 mm
Toner Packing 368 x 286 x 169 mm (External)

Weight SET with 10K toner cartridge 17.30kg (38.14lb) ()

SET w/o toner cartridge 15.46kg (34.06lb) ()
Consumable toner cartridge 10K : 1.85kg (4.08lbs), 20K : 2.06kg (4.54 lbs)
Set + Consumables 19.15 kg (42.2lb) with 10K toner cart.
Packing Weight 22.46kg (49.50lb) ()

2. Product specification and feature

2.1 Product Specifications

2.1.1 Product Overview

38ppm (Ltr. 40ppm)

SCF, Network, Memory,
HDD Option

USB 2.0, IEEE1284

20K Toner (10K Standard)

PCL6, PS3, 1200x1200dpi

400 MHz Processor, 64MB Memory

ML-4050N

- 10/100 Base TX

- Opt. 802.11b/g Wireless N/W

Duplex(Optional)

Service Manual

Product specification and feature

2-2

Samsung Electronics

2.1.2.2 Print Operability

ITEM ML-4050N REMARK

Speed Simplex Up to 38 ppm in A4 (40 ppm in Letter)

Duplex 26 ipm in A4 (27 ipm in Letter) Usable paper sizes

(Letter, A4, Folio,
Oficio, Legal)

FPOT from standby Less than 9 sec

from sleep/power save mode Less than 40 sec
from cold status Less than 49 sec

Warm Up Time from sleep/power save mode Less than 31 sec

from cold status Less than 40 sec
Toner save SWS Support
setting unit PSU. Support (30%)

LUI(Local UI) Support(UI2.0)
Duplex Print Simplex Support

Manual Duplex N/A

Duplex Optional

Product specification and feature

Service Manual

2-3

Samsung Electronics

2.1.2.4 CPU and Memory

ITEM ML-4050N REMARK

CPU SPGP V3 400MHz Samsung 400 MHz

System Bus 100MHz

Device Memory Std. 64 MB

Max. 512 MB : 2Slot
Type SDRAM
Expand memory slot and type SDRAM DIMM 2 slot / 32,64,128,256MB
Compression Technology YES

2.1.2.3 Print Quality

ITEM ML-4050N REMARK

Resolution Normal Up to 1200 x 1200 dpi effective output

Line Width @ 600dpi
Line Width @ 1200dpi
Dot Diameter @ 600dpi
Dot Diameter @ 1200dpi
RET Yes
Halftone(Gray Scale) 256 levels
Blackness >1.20
Homogeneity of Halftone

OD at five points on page must be 0.1

Halftone 20 % = 0.17 50 % = 0.49 80 % = 0.91

Printable Area Letter 208 x 271 mm

A4 200 x 289 mm

Non-Printable Area Envelope 10mm(0.4") from edge(Top, Bottom, Left, Right)

Other Media 4mm(0.16") from edge(Top, Bottom, Left, Right)

Toner Fixing Black (100% Solid)

80%

(Fuse Grade) Halftone

70%

Magnification Horizontal (applied to 177.8mm length) < 1.0 mm (0.04

) ( 0.5 % )

Vertical (applied to 241.3mm length) < 3.0 mm (0.12

) ( 1.2 % )

Printing Skew MPF < 1.5 mm (0.06

) : Simplex & Horizontal

< 2.0 mm (0.08

) : Duplex & Horizontal

< 2.0 mm (0.08

) : Simplex & Vertical

< 2.5 mm (0.10

) : Duplex & Vertical

Tray1 < 1.5 mm (0.06

) : Simplex & Horizontal

< 2.0 mm (0.08

) : Duplex & Horizontal

< 2.0 mm (0.08

) : Simplex & Vertical

< 2.5 mm (0.10

) : Duplex & Vertical

Option Tray < 2.0 mm (0.08

) : Simplex & Horizontal

< 2.5 mm (0.1

) : Duplex & Horizontal

< 2.5 mm (0.10

) : Simplex & Vertical

< 3.0 mm (0.12

) : Duplex & Vertical

Horizontal
Measurement length

180.5mm Vertical
Measurement length

241.3mm

Service Manual

Product specification and feature

2-4

Samsung Electronics

2.1.2.5 Power Supply

ITEM ML-4050N REMARK

General Spec Input Voltage Low Voltage : 110 ~ 127VAC

High Voltage : 220 ~ 240VAC
Input Frequency 50 / 60Hz(+/- 3Hz)
Power Cord Type CP-2 Black color

Power Consumption Print Less than 600W

Standby Less than 130W
Sleep/Power Off Less than 13W / 0W
Peak or Max Less than 700W

Power save mode min 5/10/15/30/60,120 Off (not assign)
etting unit Default setting 30 min

2.1.2.6 Acoustic Noise (Sound Pressure)

ITEM ML-4050N REMARK

Printing Simplex from Tray1 Less than 56.0 dBA

Simplex from MP Less than 56.0 dBA
Simplex from SCF Less than 59.0 dBA
Duplex from Tray1 Less than 59.0 dBA

Standby and etc Standby Less than 35.0 dBA

Warm up Less than 50.0 dBA
Max. Less than 60.0 dBA
Measurement Basis Back Ground Level

2.1.2.7 Environment

ITEM ML-4050N REMARK

Operating Temperature 10C to 32C
Environment Humidity 20% to 80%
Altitude Plan 0~1,500m

High1 1,500~2,500m
High2 2,500~3,500m
High3 3,500~4,000m

Product specification and feature

Service Manual

2-5

Samsung Electronics

2.1.2.8 Software

ITEM ML-4050N REMARK

Printer Languages PS3 Support

PCL6 (PCL6_C) Support
PCL5e (PCL5Ce) Support
SPL (SPL_C) N/A
PCL3 N/A
PDF2PS Support(HDD install)
EPSON/IBM Support
KSC5843 Support(only korea)
KSC5895 Support(only korea)
KSSM Support(only korea)

Print Margin(Simplex) Each side margin(left, right) Left [0-164]mm:0 *

Top Margin Top [0-250]mm:0 *

Print Margin(Duplex) Each side margin(left, right) Left [0.0-9.9]mm:5.0 *

Top Margin Top [0.0-9.9]mm:5.0 *
Short binding [0-22]mm:0 *
long binding [0-22]mm:0 *
Type Normal, Dark, Light

Fonts 45 scalable Support

1 bitmap Support
136 PostScript3 Support
OCR(A Type, B Type) Support
Barcode Support (default: unusable) usable by PJL com-

mand

Compatibility DOS No

Win 3.x No
Win 95 No
Win 98 Yes
Win ME Yes
Win NT 4.0 Yes
Win 2000 Yes
Win 2003 Server(32/64bits) Yes
Win XP (32/64bits) Yes
Win Vista Yes Post-Launch
Longhorn? No
Mac OS 8.6~9.2/10.1~10.4 Yes
Various Linux OS: Yes

- Red Hat 8~9,

- Fedora Core 1~4

- Mandrake 9.2~10.1

- SuSE 8.2~9.2

HQL Windows 2000 Yes

XP Yes
2003 Server Yes
Window Vista Yes Post-Launch

Service Manual

Product specification and feature

2-6

Samsung Electronics

ITEM ML-4050N REMARK

Driver : PCL6 & PS Win 98 Yes

Win NT4.0 Yes
Win 2000 Yes
Win Me Yes
Win XP(32/64bits) Yes
Win Vista Yes Post-Launch
Win 2003 Server(32/64bits) Yes
Linux & Mac (*PS) Yes

Application PSU Yes(Windows, Mac, Linux)

Smart Panel Yes(Windows, Mac, Linux)
DPU Yes(Windows) For PDF2PS
JMS Yes(Java based, Embedded in SWS) For HDD Job man-

agement

Job Monitor Yes(Windows, Included in Smart Panel) For HDD Job man-

agement

Network Management SWAS4.0(Syncthru Web Admin Service)

Built-in 5 Plug-in
SetIP Yes(Windows)

2.1.2.9 Network

ITEM ML-4050N REMARK

Wired Network H/W (N/W Card, CPU, ROM ) Main B'D Embeded

Type Ethernet 10/100 Base TX
Network Compatibility IEEE 802.2/3
# of LED 2 EA
Wired LAN Connector Plug-Type
Protocol SPX/IPX, TCP/IP, Ethertalk, SNMP, HTTP, IPP,

Bonjour
Supporting OS * in98/ME/NT4.0/2000/XP(32/64bits)/2003(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 8~9, Fedora

Core 1~4, Mandrake 9.2~10.1, and SuSE 8.2~9.2
* Unix HP-UX
* SUN Solaris
* SCO

Wireless LAN Architecture Yes (Optional)

Operating modes Yes
Frequency Band : 802.11a N/A
Frequency Band : 802.11b/g Yes
Supported Transfer Rates : 802.11a N/A
Supported Transfer Rates : 802.11b Yes
Supported Transfer Rates : 802.11g Yes

Product specification and feature

Service Manual

2-7

Samsung Electronics

2.1.2.10 User Interface

ITEM ML-4050N REMARK

I/O Parallel IEEE 1284

USB Hi-Speed USB 2.0
Wired Network Ethernet 10/100 Base TX (Internal)

Wireless Network Optional
LCD 1-byte 2 x 16 Character (UI2.0)
LED Configuration 2 LED (Status LED, Toner Save Button LED)

Paper Jam Place N/A

Paper Jam N/A

Toner Empty/ Drum Replace N/A
Key Configuration 8Key : Menu,

,OK(*), ,Back,Demo,Stop,

Toner Save (UI2.0)
Stop/Clear N/A
Copy/Start N/A
Help N/A
Others N/A

Service Manual

Product specification and feature

2-8

Samsung Electronics

2.1.2.11 Language

ITEM ML-4050N REMARK

LCD Language English Support

German Support
French Support
Italian Support
Spanish Support
Dutch Support
Russian Support
Norwegian Support
Swedish Support
Polish Support
Finnish Support
Danish Support
Turkish Support
Korean Support

S.Chinese Support
Network Firmware English Support
(SWS) Language French Support

German Support

Italian Support

Spanish Support

Polish Support

Russian Support

Turkish Support

Chinese Support

Korean Support
Network CD English Support
Language French Support

German Support

Italian Support

Spanish Support

Polish Support

Russian Support

Turkish Support

Chinese Support

Korean Support

Product specification and feature

Service Manual

2-9

Samsung Electronics

2.1.2.12 Paper Handling

ITEM ML-4050N REMARK

Input Size Max Custom Paper (W*H) 216 x 356 mm (8.5" x 14")

Min Custom Paper (W*H) 76 x 127 mm (3.0" x 5.0") (>105g)

Input Capacity Standard 500-sheet Cassette Tray,

100-sheet Multi Purpose Tray @75g/

Max. 1,100~2,100 sheets @75g/ ()

Output Capacity Face-Down Capacity 250 sheets @ 75g/

Face-Up Capacity 100 sheets @ 75g/
Output Full sensing Yes (Paper Out Bin Full Sensor)
Output path change Face Up/Down controlled manually by

opening rear cover

Multi-Purpose Tray Plain Paper Capacity 100 sheets @75g/

Envelope Capacity 10 sheets
Card Stork Capacity 10 sheets
Labels Capacity 25 sheets
Transparencies Capacity 50 sheets
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 16~43lb (60 to 163g/

)

Sensing Paper empty sensor

Standard Cassette Capacity 500 sheets@75g/
Tray 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

Optional Cassette Capacity 500 sheets@75g/
Tray 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

Duplex Supporting Optional

Media sizes A4, Letter, Legal, Folio, Oficio
Media types Plain paper
Media weight 20~24lb (75 to 90g/

)

Jam Rate Base Line Paper 1/12,000 prints

Standard Paper 1/10,000 prints
Stress Paper 1/1,500 prints

Jam 0,1,2 NN and LL * 1/12,000 (@ Base line Paper)

(Plain Paper) * 1/10,000 (@ Standard Paper)

* 1/1,500 (@ Stress paper)
HH * 1/6,000 (@ Base line Paper)

* 1/5,000 (@ Standard Paper)

* 1/750 (@ Stress paper)

Service Manual

Product specification and feature

2-10

Samsung Electronics

ITEM ML-4050N REMARK

Duplex Jam NN and LL * 1/6,000 (@ Base line Paper)

* 1/5,000 (@ Standard Paper)
* 1/750 (@ Stress paper)

HH * 1/3,000 (@ Base line Paper)

* 1/2,500 (@ Standard Paper)

* 1/375 (@ Stress paper)
Miss Feeding NN / LL / HH Paper Pick-up
Multi Feeding NN and LL * from MP : 1/3,000

* from CST : 1/6,000

HH * from MP : 1/1,500

* from CST : 1/3,000
Jam detect PressureRelease lever used Yes

Fuser Jam cover Yes
Release gear Yes
Pressure Roller and Heat Roller Yes
Fuser Jam remove Yes

Output paper In feeding direction +/- 9 mm Baseline/standard

scattering paper (Some papers

In side direction +/- 9 mm like recycled papers

may be out of spec)

Print Registration : Side Print Position Accuracy

2.5 mm ( 0.1 )

all tray Lead Print Position Accuracy

3.0 mm ( 0.12 ) Duplex long binding :

3.0 mm

Print Magnification Vertical <

3.0 mm ( 0.12 ) ( 1.2 % ) Aapplied to 241.3 mm
length

Horizontal <

1.0 mm ( 0.04 ) ( 0.5 % ) Aapplied to 177.8 mm
length

Bowing Horizontal <

0.5 mm ( 0.02 ) Applied to 200mm
length

2.1.2.13 Consumables

ITEM ML-4050N REMARK

CRUM CRUM or Cryto CRUM Cryto CRUM
Kind Cartridge Yes (CRU) Consumer

Replacement Unit

Life Initial Average Cartridge Yield 10K standard pages.

Declared cartridge yield in accordance with
ISO/IEC 19752.

High Yield Average cartridge Yield 20K standard pages.

Declared cartridge yield in accordance with
ISO/IEC 19752.

Toner Sensor Method S-CRUM

Alarm Timing Guage(Remaining Life)
Unique Key Support Yes
Drum Yield Same as consumables

Product specification and feature

Service Manual

2-11

Samsung Electronics

2.1.2.14 Reliability & Service

ITEM ML-4050N REMARK

Machin Life Recommended Monthly Duty 6,000 sheets / month

Cycle(AMPV)
Max. Monthly Duty 200,000 sheets
MPBF 150,000 sheets
MTBF 30 min.
MTTR 20 min.
Product Life Time(Machine life) 500,000 sheets or 5 years (whichever comes first)

*Periodic Replacing Pickup Roller 150,000 Pages

Parts Pad Unit (Tray) 150,000 Pages

Unit Roller Idle (Feed) 150,000 Pages
Transfer Roller 150,000 Pages
Fuser Unit 150,000 Pages

RDS Comm. Mode YES

Operation YES

Tech Support Event Log Yes

* Periodic Replacing Parts

5

Unit Roller Idle

(Feed)

Code Fig.

JC66-00540B

JC97-02233A

JC96-04413A(110V)

JC96-04413B(220V)

JC97-02844A

JC96-04016A

Yield (pages)PartsNo. Code Fig. Yield (pages)PartsNo.

150,000Transfer Roller1

150,000Pick-up Roller2

150,000Fuser Unit3

150,000PAD Unit(Tray)4

150,000

Service Manual

Product specification and feature

2-12

Samsung Electronics

2.1.2.15 Accessory

ITEM ML-4050N REMARK

In-Box Driver Install CD-ROM 1 EA

Power Cable 1 EA

USB Cable Korea/Russia/India/China : Yes, Other : No

Quick Install Guide Yes

Warranty Registration Card Yes

User's Manual (PDF File) Yes

Toner Cartridge 1 EA (10K yield ISO 19752 5% coverage)

2.1.2.16 Options

Option Memory Sec/Code Spec.

Memory ML-MEM110 32MB MEM

ML-MEM120 64MB MEM
ML-MEM130 128MB MEM
ML-MEM140 256MB MEM

Second Cassette Tray ML-S4050A 500 page

Wireless Network ML-NWA10L IEEE802.11 Wireless LAN

Hard Disk Diver ML-3560MH ELA UNIT-HDD,40GB

Duplex Unit ML-U4050A ELA UNIT-DUPLEX

Product specification and feature

Service Manual

2-13

Samsung Electronics

2.1.3 Model Comparison Table

2.1.3.1 SEC Model

SEC SEC SEC S AMSUNG

ML-2550 ML-4050 ML-4550 ML-3560

Image

Engine SEC SEC SEC SEC
Speed(ppm) 24ppm 38/40ppm 43/45ppm 33ppm
Processor 266MHz 400MHz 500MHz 400MHz
Resolution 1,200X1,200 dpi 1,200X1,200 dpi 1,200X1,200 dpi 1,200X1,200 dpi
FPOT 12 sec 9 sec 8.5 sec 10 sec
Emulation PS3, PCL6 PS3, PCL6 PS3, PCL6 PS3, PCL6
Ram(Std.) 32MB(Max. 160MB) 64MB(Max. 512MB) 128MB(Max. 512MB) 32MB(Max. 288MB)
Interface IEEE1284, USB 2.0 IEEE1284, USB 2.0 IEEE1284, USB 2.0 IEEE1284, USB 2.0
Duplex Yes Factory Option Factory Option Option
Paper Input 550 Cassete, 100 MP 250 Cassette, 100 MP 250 Cassette, 100 MP 500 Cassette, 100 MP

(Capa./Type) 250 SCF Opt. 250 SCF Opt. 500 SCF Option
Os Compatibility Win 95/98/NT/2000/ Win 95/98/NT/2000/ Win 95/98/NT/2000/ Win 95/98/NT/2000/

Me/XP, Mac Me/XP, Linux Me/XP, Linux Me/XP, Linux

Toner 10K 10K/20K 10K/20K 6K/12 K

Service Manual

Product specification and feature

2-14

Samsung Electronics

2.1.3.2 Competitor Model

Optional

6 K, 21K

8.5 sec

200,000

Yes

500+100 MP(2600)

PCL6, PS3

64 MB(576MB)

400 MHz

1200 x1200

33/35

Lexmark

T640N

200,000100,000200,000

Max. Monthly

Duty

Optional

10 K, 20K

8.5 sec

Yes

500+100 MP(2600)

PCL6, PS3

64 MB(576MB)

400 MHz

1200 x1200

38/40

Dell

M5210N

Image

Optional

6.5 K, 13.5K

9.5 sec

Yes

500+100 MP(1100)

PCL6, PS3

80 MB(320MB)

400 MHz

1200 x1200

33/35

HP

LJ- P3005N

OptionalDuplex

PCL6, PS3Emulation

YesLCD

10 K, 20KToner Yield

FPOT

Paper Input

(std/max.)

Memory (std/max.)

Processor

Resolution

Speed(A4/Ltr.)

64 MB(512MB)

38/40

9sec

500+100 MP(1100)

400 MHz

1200 x1200

Samsung

ML- 4050N

Lexmark

T640N

Dell

M5210N

HP

LJ- P3005N

Samsung

ML- 4050N

Product specification and feature

Service Manual

2-15

Samsung Electronics

2.2 Summary of Product

This chapter describes the functions and operating principal of the main component.

2.2.1 Printer Components

2.2.1.1 Front View

1

output tray

8

handle

2

control panel

9

paper level indicator

3

contro l board c over

10

mul ti-purpose tray

4

tray 1

11

top cover

5

optional tray 2

12

output support

6

optional tray 3

13

mul ti-purpose tray
paper width guides

7

optional tray 4

14

mul ti-purpose tray
extension

* The figure above shows an ML-4050N with

all available options.

Service Manual

Product specification and feature

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Samsung Electronics

2.2.1.2 Rear View

1

power sw itch

5

parallel port

2

rear co ver

6

USB port

3

duplex unit

7

network port

4

power receptacl e

* The figure above shows an ML -4050N

with all available options.

Product specification and feature

Service Manual

2-17

Samsung Electronics

2.2.1.2.1 Cassette (Main and Optional Tray)

Feeding Method : Cassette Type
Feeding Standard : Center Loading
Feeding Capacity : Cassette 500 Sheets(75g/ , 20lb Paper Standard)
Paper Detecting Sensor : Photo Sensor

Paper Size Sensor : Yes

2.2.1.2.2 MP Tray

Feeding Standard : Center Loading
Feeding Capacity : 100 Sheets (75g/ , 20lb Paper Standard)

Transparency (50 typical)
Labels (50 typical)
Envelopes (up to 10)

Service Manual

Product specification and feature

2-18

Samsung Electronics

2.2.1.2.3 Transfer Ass y

The life span: Print over 150,000 sheets (in 15~30 )

Product specification and feature

Service Manual

2-19

Samsung Electronics

2.2.1.2.4 Driver Ass y

It is a power delivery unit by gearing
By driving the motor, it supplies the power to the feeding unit, the fusing unit, and the distributing unit.
Two motors(Main motor & Deve motor) used for driving gears.

A solenoid used for change paper direction for duplexing.

2.2.1.2.5 Fuser Ass y

Pressure roller and Heat roller heated by E-coil
Thermistor - Temperature Detecting Sensor
Two Thermostat - Temperature-Intercepting Device

Service Manual

Product specification and feature

2-20

Samsung Electronics

The fuser is consisted of the Heat Roller with E-coil, Pressure Roller,
Thermistor, and Thermostat.

Error Phenomenon

Engine Fuser Error When warming up, it has been lower than 60 over 35 seconds.

Engine Fuser - Standby
Low Heat Error : It has been lower than 130 over 10 seconds

- Printing
Up to 2 consecutive pages :

: It has been lower than 155 over 7 seconds.
From 3 consecutive pages :

: It has been 25 lower than the fixed fusing temperature over 7 seconds.

Engine Fuser It has been higher than 230 over 10 seconds.
Over Heat Error

Error Phenomenon

LSU NOT READY When the polygon motor speed doesn’t become standby.

HSYNC ERROR The polygon motor speed is standby but the Hsync is not generated

2.2.1.2.6 LSU(Laser Scan Unit)

Consisted of LD(Laser Diode) and Polygon Motor Control.

Product specification and feature

Service Manual

2-21

Samsung Electronics

2.2.1.2.7 Toner Cartridge

Developing Method: Non-magnetic 1 element non-contacting method
Toner: Non magnetic 1 element shatter type toner (Averag Dia. 0.8 )
The life span of toner cartridge : 10,000 Sheets or 20,000 Sheets

(N/N, Simplex,ISO 5% Coverage Pattern)

OPC Cleaning: Collect the toner by using Cleaning Blade
Management of disusable toner: Collect the toner by using Cleaning Blade
OPC Drum protecting Shutter : Yes

Cleaning Roller

Cleaning Blade

-650V

0.16mW

200V

-1.25KV

V

DC

= -460V

V

PP

= 1520V, f = 2.5KHz, Duty(-) = 32%

1

2

3

4

5

6

7

8

+4.2kV

-50V

+

-

Service Manual

Product specification and feature

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Samsung Electronics

2.2.1.2.8 Duplex Unit

Automatically print on both sides of a sheet of paper with an optional duplex unit
Supports the following paper sizes : Letter, Legal, Oficio, Folio, and A4

2.2.1.2.9 Optional Paper Tray

Increase the paper handling capacity by installing optional Tray2,3 and 4
Holds 500 sheets of paper (Cassette is same as printer Tray1 cassette)

Product specification and feature

Service Manual

2-23

Samsung Electronics

1

Menu: Enters Menu mode and scrolls through the available
menus.

2

Scroll buttons: Scroll through the options available in the
selected menu, and increase or decrease values.

3

OK: Confirms the selection on the display.

4

Back : Sends you back to the upper menu level.

5

Toner Save: Allows you to save on toner by using less toner
in printing.

6

Demo: Prints a demo page.

7

Stop: Stops an operation at any time.

8

Status: Indicates the status of your printer. See page 9.6.

2.2.1.3 Control Panel

The control panel on the top right side of your printer has the display and the nine buttons.