Samsung ML-331xD, ML-331xND, ML-371xD, ML-371xND, ML-371xDW Service Manual

Service Manual

ML-331x/ML-371x Series

ML-331xD/331xND/371xD/371xND/371xDW

DIGITAL LASER PRINTER

4. Memory (Std / Max)

• ML-331x series : 64 MB / 64 MB

• ML-371xD : 64 MB / 320 MB

• ML-371xND/371xDW : 128 MB / 384 MB

5. Interfaces

• High Speed USB 2.0

• 10/100 BaseTX network connector (ML-331xND)

• 10/100/1000 BaseTX network connector (ML-371xND/371xDW)

• 802.11b/g/n wireless LAN (ML-371xDW)

• IEEE 1284 Parallel (Optional)

6. Toner Cartridge (Initial / Sales)

• ML-331x series : 2K / 2K, 5K

• ML-371x series : 5K / 2K, 5K, 10K

1. Speed

• ML-331x series : 31 ppm in A4 / 33 ppm in Letter

• ML-371x series : 35 ppm in A4 / 37 ppm in Letter

2. Processor

• ML-331x series : 375 MHz

• ML-371x series : 600 MHz

3. Printer Languages

• ML-331x series : SPL, PCL5e

• ML-371x series : PCL6/5e, PostsScript3, IBM ProPrinter, EPSON

The keynote of Product

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ⓒ

Samsung Electronics Co.,Ltd. September. 2010 Printed in Korea.

VERSION NO. : 1.00 CODE : 3310-00000E

GSPN (Global Service Partner Network)

North America : service.samsungportal.com Latin America : latin.samsungportal.com CIS : cis.samsungportal.com Europe : europe.samsungportal.com China : china.samsungportal.com Asia : asia.samsungportal.com Mideast & Africa : mea.samsungportal.com

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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

2.1 Speci cations …………………………………………………… 2-1

2.1.1 Product Overview …………………………………………… 2-1

2.1.2 Features by models ………………………………………… 2-2

2.1.3 Speci cations ………………………………………………… 2-3

2.1.4 Model Comparison Table …………………………………… 2-10

2.2 Product Description ……………………………………………… 2-11

2.2.1 Front View …………………………………………………… 2-11

2.2.2 Rear View …………………………………………………… 2-12

2.2.3 Paper Path …………………………………………………… 2-13

2.2.4 System layout ……………………………………………… 2-14

2.2.5 Hardware con guration …………………………………… 2-21

2.2.6 Engine F/W Control Algorithm ……………………………… 2-39

2.2.7 S/W Descriptions …………………………………………… 2-42

3.1 General precautions on disassembly ………………………… 3-1

3.2 Screws used in the printer ……………………………………… 3-2

chapter 1 Precautions

chapter 2 Product speciﬁ cations and descriptions

Contents

chapter 3 Disassembly and Reassembly

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3.3 Disassembly procedure ………………………………………… 3-3

3.3.1 Cover ………………………………………………………… 3-3

3.3.2 Main board …………………………………………………… 3-6

3.3.3 HVPS board ………………………………………………… 3-6

3.3.4 SMPS board ………………………………………………… 3-7

3.3.5 Laser Scanning Unit (LSU) ………………………………… 3-7

3.3.6 Fuser unit …………………………………………………… 3-8

3.3.7 Main drive unit ……………………………………………… 3-9

3.3.8 Feed drive unit ……………………………………………… 3-10

3.3.9 Pick up/ Regi/ MP clutch …………………………………… 3-10

3.3.10 Pick up roller ……………………………………………… 3-11

3.3.11 Transfer roller ……………………………………………… 3-11

3.3.12 MP unit ……………………………………………………… 3-12

3.3.13 OPE board ………………………………………………… 3-13

3.3.14 Bin-full sensor ……………………………………………… 3-13

3.3.15 Regi. / Feed / Empty sensor ……………………………… 3-14

3.3.16 Cassette roller (Retard roller) …………………………… 3-15

4.1 Alignment and Adjustments ……………………………………… 4-1

4.1.1 Control Panel ………………………………………………… 4-1

4.1.2 Understanding The Status LED …………………………… 4-4

4.1.3 JAM Removal ……………………………………………… 4-5

4.1.4 Useful menu item for service ……………………………… 4-9

4.1.5 Periodic Defective Image …………………………………… 4-11

4.1.6

Using the Easy Printer Manager program and smart panel

… 4-12

4.1.7 Updating Firmware ………………………………………… 4-14

4.1.8 Tech Mode …………………………………………………… 4-17

4.2 Troubleshooting…………………………………………………… 4-22

4.2.1 Procedure of Checking the Symptoms …………………… 4-22

4.2.2 Error Message and Troubleshooting ……………………… 4-25

4.2.3 Image Quality problem ……………………………………… 4-41

4.2.4 Other errors ………………………………………………… 4-25

4.2.5 Network problems …………………………………………… 4-41

chapter 4 Alignment and Troubleshooting

Contents

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5.1 Block Diagram …………………………………………………… 5-1

5.2 Connection Diagram……………………………………………… 5-3

6.1 Tool for Troubleshooting ………………………………………… 6-1

6.2 Acronyms and Abbreviations …………………………………… 6-2

6.2.1 Acronyms …………………………………………………… 6-2

6.2.2 Service Parts ………………………………………………… 6-4

6.3 A4 ISO 19752 Standard Pattern ………………………………… 6-8

6.3.1 A4 ISO 19752 Standard Pattern …………………………… 6-8

6.4 Selecting a location ……………………………………………… 6-9

Contents

chapter 6 Reference Information

chapter 5 System Diagram

attached Parts Catalog (Exploded Views & Parts List)

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1. Precautions

1-1

Samsung Electronics

Service Manual ML-331x/371x series

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 quali ed service engineers.

High voltages and lasers inside this product are dangerous. This printer should only be serviced by a suitably trained and quali ed 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 re hazards.

(3) Laser Safety Statement

The printer is certi ed in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter J for Class I(1) laser products, and elsewhere is certi ed as a Class I laser product conforming to the requirements of IEC 60825-1:1993 + A1:1997 + A2:2001. 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.

• Wavelength: 800 nm

• Beam divergence

- Paraller: 12 degrees

- Perpendicular: 35 degrees

• Maximum power or energy output: 15 mW

WARNING

Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The reﬂ ected beam, although invisible, can damage your eyes. When using this product, these basic safety precautions should always be followed to reduce risk of ﬁ re, electric shock, and injury to persons:

1. Precautions

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1. Precautions

Service Manual ML-331x/371x series

1-2

Samsung Electronics

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 Drum cartridge and Toner Cartridge away from children. The toner powder contained in the

Drum cartridge and 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 re.

(1) Use only the correct voltage, failure to do so could damage the printer and potentially cause a re or

electric shock.

(2) Use only the power cable supplied with the printer. Use of an incorrectly speci ed cable could cause the

cable to overheat and potentially cause a re.

(3) Do not overload the power socket, this could lead to overheating of the cables inside the wall and could

lead to a re.

(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 re 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

completely otherwise a poor contact could cause overheating possibly leading to a re. When removing the power connector grip it rmly 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 re 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 re 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 humidi er. Damp and dust build up inside the machine can lead to overheating and cause a re.

(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 re.

(12) Do not insert any metal objects into the machine through the ventilator fan or other part of the casing, it

could make contact with a high voltage conductor inside the machine and cause an electric shock.

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1. Precautions

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Samsung Electronics

Service Manual ML-331x/371x series

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

ngers, 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 re hazard.

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

humidi er 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 re.

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- tting any parts do not use excessive force, especially when tting 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 uorescent or incandescent room lighting. Exposure for as little as 5 mins can damage the surface? 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. Precautions

Service Manual ML-331x/371x series

1-4

Samsung Electronics

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 nger 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 9kg (19.84 lbs) 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 9kg (19.84 lbs), 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.

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1. Precautions

1-5

Samsung Electronics

Service Manual ML-331x/371x series

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 eld 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 classi ed as “anti-static”

can generate electrical charges suf cient to damage ESDs.

5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges suf cient 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 oor, can generate static electricity suf cient to damage an ESD.

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2. Product speciﬁ cations and descriptions

2-1

Samsung Electronics

Service Manual ML-331x/371x series

2.1 Speciﬁ cations

2.1.1 Product Overview

2. Product speciﬁ cations and descriptions

1. Speed

• ML-331x series : 31 ppm in A4 / 33 ppm in Letter

• ML-371x series : 35 ppm in A4 / 37 ppm in Letter

2. Processor

• ML-331x series : 375 MHz

• ML-371x series : 600 MHz

3. Printer Languages

• ML-331x series : SPL, PCL5e

• ML-371x series : PCL6/5e, PostsScript3, IBM ProPrinter, EPSON

4. Memory (Std / Max)

• ML-331x series : 64 MB / 64 MB

• ML-371xD : 64 MB / 320 MB

• ML-371xND/371xDW : 128 MB / 384 MB

5. Interfaces

• High Speed USB 2.0

• 10/100 BaseTX network connector (ML-331xND)

• 10/100/1000 BaseTX network connector (ML-

371xND/371xDW)

• 802.11b/g/n wireless LAN (ML-371xDW)

• IEEE 1284 Parallel (Optional)

6. Toner cartridge (Initial / Sales)

• ML-3310 series : 2K / 2K, 5K

• ML-3710 series : 5K / 2K, 5K, 10K

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2. Product speciﬁ cations and descriptions

Service Manual ML-331x/371x series

2-2

Samsung Electronics

2.1.2 Features by models

Features

ML-3310D ML-3312D

ML-3310ND

ML-3312D

ML-3710D ML-3712D

ML-3710ND ML-3712ND

ML-3710DW ML-3712DW

Hi-Speed USB 2.0 ● ● ● ● ●

IEEE 1284 Parallel ○ ○ ○ ○ ○

Network Interface Ethernet 10/100 Base TX wired LAN

●

Network Interface Ethernet 10/100/1000 Base TX wired LAN

● ●

Network Interface

802.11b/g/n wireless LAN

●

IPv6 ● ● ●

Eco printing ● ● ● ● ●

Wi-Fi Protected Setup (WPS)

●

Duplex (2-sided) printing

● ● ● ● ●

Samsung Easy Printer Driver Manager

● ● ● ● ●

Memory ○ ○ ○

Tray 2 ○ ○ ○ ○

SyncThru Web Service ● ● ●

( ●: Included, ○: Optional, Blank: Not available)

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Samsung Electronics

Service Manual ML-331x/371x series

2.1.3 Speciﬁ cations

• Product Speciﬁ cations are subject to change without notice. See below for product speciﬁ cations.

2.1.3.1 General Print Engine

Item ML-331x series ML-371x series

Engine Speed Simplex Up to 31 ppm in A4 (33 ppm in Letter) Up to 35 ppm in A4 (37 ppm in Letter)

Duplex Up to 15 ipm in A4 (16 ipm in Letter) Up to 17 ipm in A4 (18 ipm in Letter)

Warmup time From Sleep 15 sec 15 sec

FPOT From Ready As fast as 8 sec As fast as 8 sec

From Sleep As fast as 15.5 sec As fast as 15.5 sec

Resolution - Up to 1,200 x 1,200 dpi effective output Up to 1,200 x 1,200 dpi effective output

2.1.3.2 Controller & S/W

Item ML-331x series ML-371x series

Processor Samsung 375 MHz Samsung 600 MHz

Memory Std. 64 MB - 371xD : 64 MB

- 371xND / 371xDW : 128 MB

Max. 64 MB - 371xD : 320 MB

- 371xND / 371xDW : 384 MB

Flash - 331xD : 8 MB- 331xND : 16 MB - 371xD : 16 MB

- 371xND / 371xDW : 32 MB

Printer Languages PCL5e, SPL

IBM ProPrinter, EPSON

PostScript3, PCL6/5e, IBM ProPrinter, EPSON

Fonts 93 scalable, 1 bitmap 93 scalable, 1 bitmap, 136 PostScript3

fonts

Driver Default Driver SPL PCL

Install SPL PCL6 / PS3

Supporting OS Windows 2000/XP (32/64 bits) /

Vista (32/64 bits) / 2003 Server (32/64 bits) / 2008 Server(32/64 bits) / 7 (32/64 bits) /2008 Server R2

Windows 2000/XP (32/64 bits) / Vista (32/64 bits) / 2003 Server (32/64 bits) / 2008 Server(32/64 bits) / 7 (32/64 bits) /2008 Server R2

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2. Product speciﬁ cations and descriptions

Service Manual ML-331x/371x series

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Samsung Electronics

Item ML-331x series ML-371x series

Driver (Continue..)

Supporting OS (Continue..)

Various Linux OS: Fedora Core 4, 5, 6 Fedora 7, 8, 9, 10, 11, 12 RedHat Enterprise Linux WS 4, 5 SuSE 10.0, 10.1 openSuSE 10.2, 10.3, 11.0, 11.1, 11.2 SuSE Linux Enterprise Desktop 10, 11 Debian 4.0, 5.0 Ubuntu 5.04, 5.10, 6.04, 6.10, 7.04, 7.10,

8.04, 8.10, 9.04, 9.10 Mandriva 2005LE, 2006, 2007, 2007.1, 2008, 2008.1, 2009, 2009.1

Mac OS 10.3 ~ 10.6 Mac OS 10.3 ~ 10.6

Citrix Presentation Server Windows Terminal Services

WHQL Windows 2000/XP(32/64bits)/

Vista(32/64bits)/2003 Server(32/64bits)/2008 Server(32/64bits)/ 7(32/64bit)/2008 Server R2(64bits)

Windows 2000/XP(32/64bits)/ Vista(32/64bits)/2003 Server(32/64bits)/2008 Server(32/64bits)/ 7(32/64bit)/2008 Server R2(64bits)

Compatibility SPL: Win 2000/XP(32/64bits)/2003

Server(32/64bits)/Vista(32/64bits)/2008 S erver(32/64bits)/7(32/64bits)/2008 Server R2

SPL & PCL6: Win 2000/ XP(32/64bits)/2003 Server(32/64bits)/ Vista(32/64bits)/2008 Server(32/64bits)/7(32/64bits) PS3: Win 2000/XP(32/64bits)/ Vista(32/64bits)/2003 server(32/64bits)/2008 Server(32/64bits)/7 (32/64bits) PPD, Mac PPD, Linux PPD

Wired Network Protocol - 331xD : N/A

- 331xND : TCP/IP, Ethertalk, SNMP, HTTP 1.1

- 371xD : N/A

- 371xND/ 371xDW : TCP/IP, Ethertalk, SNMP, HTTP 1.1

Supporting OS - 331xD : N/A

- 331xND : Windows 2000/XP(32/64bits)/2003 Server(32/64bits)/Vista(32/64bits)/2008 Server(32/64bits) Mac OS 8.6~9.2, 10.1~10.5 Various Linux OS including Red Hat 8~9, Fedora Core 1~4, Mandrake 9.2~10.1, and SuSE 8.2~9.2 NetWare 5.x, 6.x (TCP/IP Only) Unix HP-UX

- 371xD : N/A

- 371xND / 371xDW :

Windows 2000/XP(32/64bits)/2003 Server(32/64bits)/Vista(32/64bits)/2008 Server(32/64bits) Mac OS 8.6~9.2, 10.1~10.5 Various Linux OS including Red Hat 8~9, Fedora Core 1~4, Mandrake 9.2~10.1, and SuSE 8.2~9.2 NetWare 5.x, 6.x (TCP/IP Only) Unix HP-UX

Wireless Network

Protocol N/A - 371xD / 371xND : N/A

- 371xDW : 802.11n

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Service Manual ML-331x/371x series

Item ML-331x series ML-371x series

Application Smart Panel SmartPanel for Windows/ Macintosh/

LINUX

SmartPanel for Windows/ Macintosh/ LINUX

Printer Setting PSU for Windows/ Macintosh/LINUX PSU for Windows/ Macintosh/LINUX

Network Management

- 331xD : N/A

- 331xND : SyncThru Web Admin Service

5.0

- 371xD : N/A

- 371xND/ 371xDW : SyncThru Web Admin Service 5.0

IP Setting - 331xD : N/A

- 331xND : SetIP

- 371xD : N/A

- 371xND/ 371xDW : SetIP

Interface

IEEE 1284 Parallel Optional Optional

USB Hi-Speed USB 2.0 Hi-Speed USB 2.0

Wired Network - 331xD : N/A

- 331xND : Ethernet 10/100 Base TX (Internal)

- 371xD : N/A

- 371xND / 371xDW : Ethernet 10/100/1000 Base TX (Internal)

Wireless Network N/A 371xDW only

User Interface

LCD - 331xD : N/A

- 331xND :2-Line

2-Line

LED 4EA: ECO(1), Power(1), Status(2) - 371xD / 371xND : 4EA( ECO(1),

Power(1), Status(2))

- 3710xW : 5EA (ECO(1), Power(1), Status(2), WPS(1))

Key - 331xD : 3EA (ECO, Power, Cancel)

- 331xND : 8EA (5 Navigation keys, ECO, Power, Cancel)

- 371xD / 371xND : 8EA (5 Navigation keys, ECO, Power, Cancel)

- 371xDW : 9EA (5 Navigation keys, ECO, WPS, Power, Cancel)

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2. Product speciﬁ cations and descriptions

Service Manual ML-331x/371x series

2-6

Samsung Electronics

2.1.3.3 Paper Handling

Item ML-331x series ML-371x series

Standard Capacity 250-sheet Cassette Tray,

1-sheet (331xD)/ 50-sheet (331xND) Multi Purpose Tray @80g/㎡

250-sheet Cassette Tray, 50-sheet Multi Purpose Tray @80g/㎡

Max. Capacity - 331xD : 251 sheets @ 80g/㎡

- 331xND : 820 sheets @ 80g/㎡

820 sheets @ 80g/㎡

Printing Max. Size 216 x 356 mm (8.5" x 14") 216 x 356 mm (8.5" x 14")

Min. Size 76 x 127 mm (3.0" x 5.0") 76 x 127 mm (3.0" x 5.0")

Multi-purpose tray

Capacity Plain Paper - 331xD : 1 sheet @ 80g/㎡

- 331xND : 50 sheets @ 80g/㎡

50 sheets @ 80g/㎡

Envelop - 331xD : 1 sheet

- 331xND : 5 sheets

5 sheets

Media sizes A4, A5, A6, Letter, Legal, Folio, Oﬁ cio,

Executive, ISO B5, JIS B5, 3"x5", Envelope(Monarch, No.10, DL, C5, C6), Custom

A4, A5, A6, Letter, Legal, Folio, Oﬁ cio, Executive, ISO B5, JIS B5, 3"x5", Envelope(Monarch, No.10, DL, C5, C6), Custom

Media type Plain, Thin, Thick, Thicker, Cotton, Colored,

Envelope, Transparency, Pre-Printed, Recycled, Labels, Bond, Card stock, Archive

Plain, Thin, Thick, Thicker, Cotton, Colored, Envelope, Transparency, Pre-Printed, Recycled, Labels, Bond, Card stock, Archive

Media weight 16~58lb (60 to 220g/㎡) 16~58lb (60 to 220g/㎡)

Sensing - 331xD : N/A

- 331xND : Paper Empty

Paper Empty

Standard Cassette Tray

Capacity 250 sheets @ 80g/㎡ 250 sheets @ 80g/㎡

Media sizes A4, A5, A6, Letter, Legal, Folio, Oﬁ cio,

Executive, ISO B5, JIS B5, Custom

A4, A5, A6, Letter, Legal, Folio, Oﬁ cio, Executive, ISO B5, JIS B5, Custom

Media types Plain Paper, Thin, Thick, Recycled, Bond,

Cardstock, Archive

Plain Paper, Thin, Thick, Recycled, Bond, Cardstock, Archive

Media weight 16~43lb (60 to 163g/㎡) 16~43lb (60 to 163g/㎡)

Sensing Paper Empty Paper Empty

Optional Cassette Tray

Capacity - 331xD : N/A

- 331xND : 520 sheets @ 80g/㎡

520 sheets @ 80g/㎡

Media sizes - 331xD : N/A

- 331xND : A4, A5, A6, Letter, Legal, Folio, Oﬁ cio, Executive, ISO B5, JIS B5

A4, A5, A6, Letter, Legal, Folio, Oﬁ cio, Executive, ISO B5, JIS B5

Media types - 331xD : N/A

- 331xND : Plain Paper, Thin, Thick, Recycled, Bond, Cardstock, Archive

Plain Paper, Thin, Thick, Recycled, Bond, Cardstock, Archive

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Service Manual ML-331x/371x series

Item ML-331x series ML-371x series

Media weight - 331xD : N/A

- 331xND : 16~43lb (60 to 163g/㎡)

16~43lb (60 to 163g/㎡)

Sensing - 331xD : N/A

- 331xND : Paper Empty

Paper Empty

Output Stacking

Capacity Face-Down 150 sheets @ 80g/㎡ 150 sheets @ 80g/㎡

Face-Up 1 sheet 1 sheet

Output Full sensing Yes Yes

Duplex

Supporting Built-in Built-in

Media sizes A4, Letter, Oﬁ cio, Folio, Legal A4, Letter, Oﬁ cio, Folio, Legal

Media types Plain Paper, Thin, Thick, Recycled, Bond Plain Paper, Thin, Thick, Recycled, Bond

Media weight 16~32lb (60 to 120g/㎡) 16~32lb (60 to 120g/㎡)

Printable Area

Non-Printable Area

Envelop 10mm(0.4") from edge(Top, Bottom, Left,

Right)

10mm(0.4") from edge(Top, Bottom, Left, Right)

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

Right)

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

2.1.3.4 Consumables

Item ML-331x series ML-371x series

Toner Black - Standard: Average Cartridge Yield 2K

standard pages.

- High Yield: Average cartridge Yield 5K standard pages.

Declared cartridge yield in accordance with ISO/IEC 19752.

- Standard: Average Cartridge Yield 2K standard pages.

- High Yield: Average cartridge Yield 5K standard pages.

- Extra High Yield: Average cartridge Yield 10K standard pages.

Declared cartridge yield in accordance with ISO/IEC 19752.

Key Electronic key(CRUM) Only Electronic key(CRUM) Only

Life detect Toner gauge sensor by dot count Toner gauge sensor by dot count

Drum Yield N/A N/A

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2.1.3.5 Reliability & Service

Item ML-331x series ML-371x series

Recommanded AMPV 1000 sheets/month 1500 sheets/month

Max AMPV 2500 sheets/month 3500 sheets/month

Max. Monthly Duty 50,000 sheets/month 80,000 sheets/month

MPBF 35,000 sheets 45,000 sheets

MTBF 35 months 35 months

MTTR 30 min. 30 min.

SET Life Cycle 170,000 sheets or 5 years (whichever

comes ﬁ rst)

220,000 sheets or 5 years (whichever comes ﬁ rst)

2.1.3.6 Maintenance part

Item Part Code Life

Transfer roller JC66-02842A Approx. 100,000 Pages

Fuser Unit JC91-01023A (110V)

JC91-01024A (220V)

Approx. 90,000 Pages

Pick-up Roller JC73-00340A Approx. 90,000 Pages

Retard Roller JC90-01032A Approx. 60,000 Pages

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Service Manual ML-331x/371x series

2.1.3.7 Environment

Item ML-331x series ML-371x series

Operating Environment Temperature 10C to 32C 10C to 32C

Humidity 20% to 80% 20% to 80%

Acoustic Noise Level(Sound Power/ Pressure)

Printing 51dBA 52dBA

Standby 26 dBA 26 dBA

Sleep Back Ground Level Back Ground Level

Power Consumption Ready Less than 55W Less than 55W

AVG. Less than 550W Less than 600W

Max/Peak Less than 600W Less than 650W

Sleep / Power Off Less than 8W / Less than 0.4W

(Conformity to EPA)

Less than 8W / Less than 0.4W (Conformity to EPA)

Dimension (W x D x H) (W x D x H)

SET 366 x 368 x 240.6 366 x 368 x 240.6

Weight SET 9.0Kg 9.0Kg

2.1.3.6 Options

Item ML-331x series ML-371x series

Memory N/A 256MB

Second Cassette - 331xD : N/A

- 331xND : 520-sheet Cassette Tray

520-sheet Cassette Tray

Wireless Network N/A N/A

Hard Disk N/A N/A

2.1.3.8 Others

Item ML-331x series ML-371x series

Memory Upgradable Mem. Slot N/A YES

Upgradable Mem. Type N/A SODIMM

Upgradable Mem. Unit N/A 256MB

Sensor Paper Empty YES YES

Paper Size NO NO

Media Type NO NO

Paper Full YES YES

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2.1.4 Model Comparison Table

Samsung

ML-3710 series

Samsung

ML-3310 series

P2050 series

Lexmark

E360dn

Image

Speed

35 ppm (A4)

37 ppm (Letter)

31 ppm (A4)

33 ppm (Letter)

33 ppm (A4) 38 ppm (A4)

Processor 600 MHz 375 MHz 600 MHz 400 MHz

Memory (Std/Max)

371xD (64/320 MB)

371xND/DW

(128/384MB)

64 / 64 MB

P2055dn (128/384 MB)

P2055d (64/320MB)

32 / 288 MB

Emulation PCL6/5e, PS3 SPL, PCL5e PCL6 PCL6/PS3

MP/Cassette 50 / 250

1 / 250 (331xD)

50 / 250 (331xND)

50 / 250 50 / 250

SCF 520 sheets

N/A (331xD)

/ 520 sheets (331xND)

500 sheets 550 sheets

Duplex Std. Std. Std. Std.

Toner Yield 2K/ 5K / 10K 2K / 5K 2.3K/ 6.5K 3.5K / 9K

Interface

- High speed USB 2.0

- Ethernet 10/100/1000 Base TX (371xND/DW)

- Wireless LAN (371xDW)

- High speed USB 2.0

- Ethernet 10/100 Base TX (331xND)

- High speed USB 2.0

- Ethernet 10/100/1000 Base TX (P2055dn)

- High speed USB 2.0

- Ethernet 10/100 Base TX

Noise 52dB 51dB 55dB 53dB

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Service Manual ML-331x/371x series

2.2 Product Description

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

2.2.1 Front View

[

]

1 Output tray 7 Tray 1

2 Control panel 8 Multi-purpose tray

3 Control board cover 9 Multi-purpose tray paper extension

4 Front cover 10 Paper width guides on a multi-purpose tray

5 Paper level indicator 11 Output support

6 Optional tray 2

a. Optional device.

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2.2.2 Rear View

1 Network Port

5 Power receptacle

2 USB port 6 Duplex unit

3 Output 5V 7 Rear cover

4 Power Switch (Only Korea)

a. Available only with models that support network connection.

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Service Manual ML-331x/371x series

2.2.3 Paper Path

[1] Simplex [2] Duplex [3] MP

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2.2.4 System layout

This model is consisted of the Engine parts and F/W. The engine parts is consisted of the mechanical parts comprising Frame, Feeding, Developing, Driving, Transferring, Fusing, Cassette and H/W comprising the main control board, power board, operation panel, PC Interface.

1 LSU 7 Cassette

2 Cartridge 8 Duplex

3 Regi roller 9 Fuser

4 MP 10 Exit roller1

5 Feed roller 11 Exit roller2

6 Pick up roller

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Service Manual ML-331x/371x series

2) Pick up / Retard Roller

When pickup takes place, the pickup roller rotates to separate and transport the paper. The pickup roller rotates when the pickup clutch is activated. The retard roller serve to make sure that a single sheet of paper is moved to the paper path, and the paper is moved as far as the registration roller by the work of the feed roller. The following is a diagram of the pickup section:

2.2.4.1 Feeding Part

It is consists of a basic cassette, an MP tray for supplying different types of media (envelope, label, special paper) and parts related to paper transferring.

1) Basic cassette

The paper trays consist of the Main trays, Optional trays (SCF), and one Multi-Purpose (MP) tray. The basic cassette is located on front side of the machine and allows feeding of common paper. Paper size is set using the Size Guides in each tray. Adjust the Paper length/width guides to match the paper size.

Pickup Roller

Feed Roller

Regi. Roller

Retard Roller

Pickup Roller

Feed Roller

Regi. Roller

Retard Roller

1 Paper length guide 2

Support guide

Paper width guide

LGL

LTR

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3) Registration roller

It has a paper arranging function, paper transferring function, paper detecting function, jam removing function, and so on.

4) MP tray

The multi-purpose tray can hold special sizes and types of print material, such as postcards, note cards, and envelopes. It is useful for single page printing on letterhead or colored paper. It uses 3 rollers feeding method to feed 50 sheets (371x series / 331xND) or 1 sheet (331xD) of general papers.

5) Duplex unit

It has paper transferring function, paper guide function, jam removing function. It is designed for basic attachment, and the duplex feeding takes a side feeding method. Usable papers are A4, letter, and legal size paper. For removing a jam occurred in a front part, it is designed to open a cassette and a guide.It is designed to open a rear cover to remove a jam in a rear part. If a face up tray is open, the duplex option cannot be used.

6) SCF (Second Cassette Feeder)

It is the same method with the main cassette, and the capacity is 520 sheets. It has a separate driving mechanism. It is designed for a common use with a main cassette.

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Service Manual ML-331x/371x series

2.2.4.2 Imaging unit

1) Printing process overview

This mono printing system includes the LSU with a laser beams, a toner cartridge and transfer roller.

This machine uses single toner cartridge and dual laser beams for mono printing. The toner cartridge consists of Drum unit and Development unit. The Drum unit has an OPC drum, cleaning blade.

The OPC drum is charged with a negative voltage by the scorotron and is exposed by the light from the LSU (Laser Scanning unit). The light produced by a laser creates a latent image by discharging on the surface of the OPC drum. The negatively charged toners are attracted to the latent image due to and electric ﬁ led. The toners(real image) on the OPC drum are moved to the transfer media by the positive bias applied to the transfer roller.

1. Charging the OPC drum: The scorotron gives the drum negative charges.

2. Laser exposure: Light produced by a laser diode irradiates the charged OPC through the lens and mirrors.

3. Development: This machine uses a dual-component development system . The magnetic roller carries negatively

charged toner to the latent image on the drum surface.

4. Transfer: The transfer rollers opposite the OPC drums transfer toner from the drums to the transfer media (e.g. paper, OHP ﬁ lm, etc).

5. Cleaning for OPC drum: The cleaning blade removes remaining toners on the drum surface after image transfer

to the paper.

LSU

Toner Cartridge

OPC Drum

Transfer Roller

LSU

Toner Cartridge

OPC Drum

Transfer Roller

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2) Toner cartridge

By using the electronic photo process, it creates a visual image. In the toner cartridge, the OPC unit and the developing unit are in a body. The OPC unit has OPC drum and charging roller, and the toner cartridge unit has toner, supply roller, developing roller, and blade (Doctor blade)

• Operation condition : Temp 10~30℃, Humidity 20~85% RH

• Developing Method : Non magnetic 1 element contacting method

• Toner : Non magnetic 1 element shatter type toner

• The life span of toner (ISO 19752 pattern / A4 standard)

→ Initial toner : 2K (331x series) / 5K (337x series) → Sales toner : 2K / 5K / 10K(only 337x series)

• Toner Residual Sensor : Dot count with CRUM(CRU Monitor)

• OPC Cleaning : Collect the toner by using cleaning blade

• Handling of wasted toner : Collect the wasted toner in the cleaning frame by using cleaning blade

• OPC Drum Protecting Shutter : None

• Classifying device for toner cartridge: ID is classiﬁ ed by CRUM.

ⓐ Charge Roller ⓕ Supply Roller

ⓑ Drum OPC ⓖ Charge Cleaning Roller

ⓓ Doctor Blade ⓘ Agitator 2

ⓔ Developer Roller

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Service Manual ML-331x/371x series

2.2.4.3 Fuser unit

It is consisted of a halogen lamp, heat roller, pressure roller, thermistor and thermostat. It sticks the toner on a paper by heat and pressure to complete the printing job.

1) Thermostat

When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over- heating.

- Thermostat Type : Non- Contact type THERMOSTAT

- Control Temperature : 170℃ ± 5℃

2) Thermistor

It is a temperatrue detecting sensor.

- Temperature Resistance : 7㏀ (180℃ )

3) Heat roller

The heat roller transfers the heat from the lamp to apply a heat on the paper. The surface of a heat roller is coated with Teﬂ on, so toner does not stick to the surface.

4) Pressure roller

A pressure roller mounted under a heat roller is made of a silicon resin, and the surface also is coated with Te ﬂ on. When a paper passes between a heat roller and a pressure roller, toner adheres to the surface of a paper permanently.

5) Halogen Lamp

- Voltage 120 V : 115 ± 5 %

220 V : 230 ± 5 %

- Capacity : 850 Watt ± 25 W

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2.2.4.4 LSU (Laser Scanning Unit)

It is the core part of the LBP which switches from the video data received to the controller to the electrostatic latent image on the OPC drum by controlling laser beam, exposing OPC drum, and turning principle of polygon mirror. The OPC drum is turned with the paper feeding speed. The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror, and the 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 paper. The one side of the polygon mirror is one line for scanning.

OPC Drum

Photo Diode

LD Driver circit

Protector panel

LD(Laser Diode)

Polygon Mirror

Polygon Motor

Motor Driver

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+ 108 hidden pages

Samsung ML-331xD, ML-331xND, ML-371xD, ML-371xND, ML-371xDW Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual