Samsung ML-331x, ML-371x Service Manual

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Service Manual

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

The keynote of Product

ProPrinter, EPSON

DIGITAL LASER PRINTER

ML-331x/ML-371x Series

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

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

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

ⓒ

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

VERSION NO. : 1.00 CODE : 3310-00000E

chapter 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

chapter 2 Product speciﬁcations and descriptions

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

chapter 3 Disassembly and Reassembly

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

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

Contents

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

chapter 4 Alignment and Troubleshooting

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

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

Using the Easy Printer Manager program and smart panel

… 4-12

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 - 2 5

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

4.2.4 Other errors ………………………………………………… 4- 2 5

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

chapter 5 System Diagram

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

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

chapter 6 Reference Information

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

Contents

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

attached Parts Catalog (Exploded Views & Parts List)

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 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 reﬂected beam, although invisible, can damage your eyes. When using this product, these basic safety precautions should always be followed to reduce risk of ﬁre, electric shock, and injury to persons:

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1. Precautions

1.2 Caution for safety

1.2.1 Toxic material

This product contains toxic materials that could cause illness if ingested.

(1) If the LCD control panel is damaged it is possible for the liquid inside to leak. This liquid is toxic. Contact

with the skin should be avoided, wash any splashes from eyes or skin immediately and contact your doctor. If the liquid gets into the mouth or is swallowed see a doctor immediately.

(2) Please keep 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

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

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

1.3 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 speciﬁcations and descriptions

2.1 Speciﬁcations

2.1.1 Product Overview

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 speciﬁcations and descriptions

2.1.2 Features by models

Features

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)

ML-3310D ML-3312D

ML-3310ND

ML-3312D

●

ML-3710D ML-3712D

ML-3710ND ML-3712ND

● ●

ML-3710DW ML-3712DW

●

Duplex (2-sided) printing

Samsung Easy Printer Driver Manager

Memory ○ ○ ○

Tray 2 ○ ○ ○ ○

SyncThru Web Service ● ● ●

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

● ● ● ● ●

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2. Product speciﬁcations and descriptions

2.1.3 Speciﬁcations

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

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

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

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

PostScript3, PCL6/5e, IBM ProPrinter, EPSON

fonts

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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Driver (Continue..)

2. Product speciﬁcations and descriptions

Item ML-331x series ML-371x series

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)

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

Wired Network Protocol - 331xD : N/A

- 331xND : 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

Wireless

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

Network

Citrix Presentation Server Windows Terminal Services

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

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

- 371xD : N/A

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

- 371xD : N/A

- 371xND / 371xDW :

- 371xDW : 802.11n

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2. Product speciﬁcations and descriptions

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

IP Setting - 331xD : N/A

- 331xND : SetIP

- 371xD : N/A

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

- 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

2-Line

- 331xND :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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2.1.3.3 Paper Handling

Item ML-331x series ML-371x series

2. Product speciﬁcations and descriptions

Standard Capacity 250-sheet Cassette Tray,

1-sheet (331xD)/ 50-sheet (331xND) Multi

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

Purpose Tray @80g/㎡

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

820 sheets @ 80g/㎡

- 331xND : 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/㎡

50 sheets @ 80g/㎡

- 331xND : 50 sheets @ 80g/㎡

Envelop - 331xD : 1 sheet

5 sheets

- 331xND : 5 sheets

Media sizes A4, A5, A6, Letter, Legal, Folio, Oﬁcio,

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

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

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

Paper Empty

- 331xND : Paper Empty

Standard Cassette Tray

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

Media sizes A4, A5, A6, Letter, Legal, Folio, Oﬁcio,

Executive, ISO B5, JIS B5, Custom

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

Cardstock, Archive

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

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

520 sheets @ 80g/㎡

- 331xND : 520 sheets @ 80g/㎡

Media sizes - 331xD : N/A

- 331xND : A4, A5, A6, Letter, Legal, Folio,

A4, A5, A6, Letter, Legal, Folio, Oﬁcio, Executive, ISO B5, JIS B5

Oﬁcio, Executive, ISO B5, JIS B5

Media types - 331xD : N/A

- 331xND : Plain Paper, Thin, Thick,

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

Recycled, Bond, Cardstock, Archive

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2. Product speciﬁcations and descriptions

Item ML-331x series ML-371x series

Media weight - 331xD : N/A

16~43lb (60 to 163g/㎡)

- 331xND : 16~43lb (60 to 163g/㎡)

Sensing - 331xD : N/A

Paper Empty

- 331xND : Paper Empty

Output Stacking

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

Face-Up 1 sheet 1 sheet

Output Full sensing Ye s Yes

Duplex

Supporting Built-in Built-in

Media sizes A4, Letter, Oﬁcio, Folio, Legal A4, Letter, Oﬁcio, 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)

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

Right)

10mm(0.4") 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.

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

- 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.

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2. Product speciﬁcations and descriptions

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 ﬁrst)

220,000 sheets or 5 years (whichever comes ﬁrst)

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)

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

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

Approx. 90,000 Pages

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2. Product speciﬁcations and descriptions

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)

Power Consumption Ready Less than 55W Less than 55W

Printing 51dBA 52dBA

Standby 26 dBA 26 dBA

Sleep Back Ground Level Back Ground Level

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)

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

Weight SET 9.0Kg 9.0Kg

SET 366 x 368 x 240.6 366 x 368 x 240.6

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

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

Wireless Network N/A N/A

Hard Disk N/A N/A

520-sheet Cassette Tray

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. Product speciﬁcations and descriptions

2.1.4 Model Comparison Table

Samsung

ML-3710 series

Image

Speed

Processor 600 MHz 375 MHz 600 MHz 400 MHz

Memory (Std/Max)

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

MP/Cassette 50 / 250

SCF 520 sheets

35 ppm (A4)

37 ppm (Letter)

371xD (64/320 MB)

371xND/DW

(128/384MB)

Samsung

ML-3310 series

31 ppm (A4)

33 ppm (Letter)

64 / 64 MB

1 / 250 (331xD)

50 / 250 (331xND)

N/A (331xD)

/ 520 sheets (331xND)

P2050 series

33 ppm (A4) 38 ppm (A4)

P2055dn (128/384 MB)

P2055d (64/320MB)

50 / 250 50 / 250

500 sheets 550 sheets

32 / 288 MB

Lexmark

E360dn

Duplex Std. Std. Std. Std.

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

- High speed USB 2.0

Interface

Noise 52dB 51dB 55dB 53dB

- 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

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2. Product speciﬁcations and descriptions

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

2 3

2. Product speciﬁcations and descriptions

1 Network Port

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.

5 Power receptacle

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2.2.3 Paper Path

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

2. Product speciﬁcations and descriptions

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2. Product speciﬁcations and descriptions

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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2. Product speciﬁcations and descriptions

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.

LGL

LTR

1 Paper length guide 2 Support guide 3 Paper width guide

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:

Pickup Roller

Feed Roller

Regi. Roller

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2. Product speciﬁcations and descriptions

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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2.2.4.2 Imaging unit

1) Printing process overview

2. Product speciﬁcations and descriptions

LSU

Toner Cartridge

OPC Drum

Transfer Roller

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 ﬁled. 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 ﬁlm, etc).

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

to the paper.

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2. Product speciﬁcations and descriptions

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 classiﬁed by CRUM.

ⓐ Charge Roller ⓕ Supply Roller

ⓑ Drum OPC ⓖ Charge Cleaning Roller

ⓓ Doctor Blade ⓘ Agitator 2

ⓔ Developer Roller

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2. Product speciﬁcations and descriptions

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 Teﬂon, 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 ﬂon. 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. Product speciﬁcations and descriptions

OPC Drum

Photo Diode

LD Driver circit

Protector panel

LD(Laser Diode)

Polygon Mirror

Polygon Motor

Motor Driver

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.

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2. Product speciﬁcations and descriptions

2.2.5 Hardware conﬁguration

The ML-331x series Electrical Circuit System consists of the following:

• Main Controller

• OPE Controller

• SCF(Option)

• SMPS

• HVPS

Diagram of the ML-331x Series Electrical Circuit

The Main Controller controls all modules required to print, that is, LSU, HVPS, SMPS, FAN, Fuser, etc. The Main Controller receives print data from the host through network or USB Port. It takes this information and generates printable video bitmap data. Engine and Video Controller are not separated.

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2. Product speciﬁcations and descriptions

The Main Controller adopts the Jupiter5(375MHz) CPU, on board DDR2 memory to perform printing jobs successfully.

The OPE Controller displays the status of the system using 16 x 2line LCD in response to user actions or the Main controller. ML-331xD model only supports LED OPE without LCD module.

The HVPS supplies high voltage for developing Process. High Voltage controlled by PWM signal from CPU.

SMPS makes +5V and +24V DC from 220V or 110 AC.

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2. Product speciﬁcations and descriptions

The ML-371x series Electrical Circuit System consists of the following:

• Main Controller

• OPE Controller

• DDR2 SODIMM(Option)

• WLAN Module(371xDW only)

• SCF(Option)

• SMPS

• HVPS

Diagram of the ML-3710 Series Electrical Circuit

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2. Product speciﬁcations and descriptions

The Main Controller adopts the CHORUS4(600MHz) CPU, on board DDR2 memory and external memory to perform printing jobs successfully.

The OPE Controller displays the status of the system using 16 x 2line LCD in response to user actions or the Main controller.

The HVPS supplies high voltage for developing Process. High Voltage controlled by PWM signal from CPU.

SMPS makes +5V and +24V DC from 220V or 110 AC.

WLAN module is used for wireless communication.

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2. Product speciﬁcations and descriptions

HVPS

SMPS

ML-3310 Main Controller

ML-3710 Main Controller

Circuit Board Locations

The following diagrams show the locations of the printer circuit boards:

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2. Product speciﬁcations and descriptions

2.2.5.1 Main controller

ML-331x series Main Controller is composed with below components

- JUPITER5 : To generate the printable video data and control engine

Embedded USB2.0 device

- On board DDR2 SDRAM : system memory(64MB)

- Ethernet PHY : Network printing

- Serial Flash : Program memory

ML-331xD : 8MB, ML-331xND : 16MB

The Main Controller manages an Electro-photography system, controls the Video Data of printing images from Main Board to LSU, provides high-voltages and PWMs, adjusts temperature in the fusing system, reads sensor signals and controls SCF option. The Main controller also controls OPE and N/W PHY, USB Device.

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2. Product speciﬁcations and descriptions

ML-331x series Main Controller Printed Circuit Board Assembly

● Connection

1 HVPS 12 Air temperature

2 Paper Empty, Regi, Feed sensor 13 FAN SMPS

3 OPE 14 Main Motor & Clutch

4 CRUM 15 SCF

5 THERMISTOR 16 SMPS Signal

6 Outbin Full Sensor & Rear Cover 17 SMPS Power

7 ERASER 18 MP

8 N/W 19 DEBUG

9 USB Device 20 LSU

10 Parallel Option DC supply jack 21 FAN MAIN

11 Exit Sensor

● Information

- SEC-CODE : JC92-02329A

- PBA Name : PBA-MAIN

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2. Product speciﬁcations and descriptions

ML-371x series Main Controller is composed with below components

- CHORUS4 : To generate the printable video data and control engine

Embedded USB2.0 device, Host channel

- On board DDR2 SDRAM and external DDR2 SO-DIMM : system memory

On board DDR2 - 371xD : 64MB, 371xND/DW :128MB External DRR2 SO-DIMM : 128MB, 256MB

- Giga Ethernet PHY : Network printing

- Serial Flash(16MB) : Program memory

- Engine Controller(LEPC1) : ADC, DAC, Clutch, Fuser control

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2. Product speciﬁcations and descriptions

ML-371x series Main Controller Printed Circuit Board Assembly

● Connection

1 HVPS

2 Paper Empty, Regi, Feed sensor

3 WLAN

4 OPE

5 CRUM

6 THERMISTOR

7 Outbin Full Sensor & Rear Cover

8 ERASER

9 N/W

10 USB Device

11 Parallel Option DC supply jack

● Information

- SEC-CODE : JC92-02343A

- PBA Name : PBA-MAIN

12 Debug

13 Exit Sensor

14 Air temperature

15 FAN SMPS

16 Main Motor & Clutch

17 SCF

18 JTAG

19 SMPS Signal

20 SMPS Power

21 MP

22 LSU

23 FAN MAIN

24 DDR2 SODIMM

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2. Product speciﬁcations and descriptions

2.2.5.2 OPE Controller

The OPE Controller is composed of an OPE MICOM(STM8SP103K3MAFTR), two status LED, ECO LED, power LED, WPS LED(ML-371xDW model only), 16x2 line LCD and some keys. OPE communicates with main controller via UART.

ML-3710D model OPE is composed of LEDs and KEYs without LCD.

Diagram of OPE Controller

OPE Controller PBA

● Information

- SEC-CODE : JC92-02341A

- PBA Name : OPE-LCD

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- SEC-CODE : JC92-02342A

- PBA Name : OPE-LED

Samsung Electronics

2. Product speciﬁcations and descriptions

2.2.5.3 SO-DIMM PBA(ML-371x series) - Optional

The SO-DIMM PBA is the system Memory module of the Main Controller. It is used for the operating system, some system application programs, and it stores some print data from the USB and Network port. There are two kinds of SO-DIMM PBA:

• 128MB & 256MB capacity

● Information

- SEC-CODE : JC92-01923A 128MB JC92-01975A 256MB

- PBA Name : PBA RAM DIMM

2.2.5.4 WLAN(ML-371xDW model only)

The Wireless LAN Module supports 802.11b/g/n at only 371xDW model via USB 2.0 high speed. The Module is installed at the USB Host Channel of Main Controller PBA.

● Information

- SEC-CODE : JC92-02364A

- PBA Name : PBA-WNPC

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2. Product speciﬁcations and descriptions

2.2.5.5 SCF PBA - Optional

The SCF PBA is the SCF control board. It use UART communication with main controller. S3F443FX is used as a microcontroller. ML-3310D model doesn’t support SCF.

● Information

PBA Name : PBA-SCF

2.2.5.6 CRUM PBA

ML-3X10 series use same CRUM PBA as ML-1660. CRUM PBA use I2C communication with main Controller.

● Information

- SEC-CODE : JC92-02055B

- PBA Name : PBA-CRUM

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2. Product speciﬁcations and descriptions

2.2.5.7 Connection Part

Controller require connections to all of the system units such as the BLDC motor, Clutch, Sensor, and other PBAs(OPE, HVPS, SMPS). The Main Controller contains various types of connectors, to deliver electronic signals through signal wires. The signal wires provide electronic control signals that are used for starting and stopping the motors, operating clutches, sensing the unit state, etc.

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2. Product speciﬁcations and descriptions

2.2.5.8 SMPS Board

The SMPS (Switching Mode Power Supply) Board supplies electric power to the Main Board and other boards through a Main Controller. The voltage provided includes +5V, and +24V from a 110V/220V power input.

● Speciﬁcation

General Input/Output Voltage

1) AC 110V (90V ~ 135V)

2) AC 220V (180V ~ 270V)

3) Output Current:

-.+5V : 1.6A

-.+24V : 1.8A

3) Output Power:

-.+5V : 8.16W

-.+24V : 43.2W

5) Heat Lamp Capacity : 850W

● Information

110V 220V

SEC CODE JC44-00095D JC44-00096D

PBA NAME SMPS V1 SMPS V2

● Connection

1 INPUT_AC

2 Fuser_AC Output

3 SMPS Control Signal (from Engine PBA)

4 OUTPUT_5V&24V (to DC POWER PBA)

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2. Product speciﬁcations and descriptions

2 3 4 5

2.2.5.9 HVPS Board

The ML-331x /371x series contains a High Voltage Power Supply(HVPS) board. This board generates high-voltage channels which includes MHV, DEV, BLADE, SUPPLY, OPC, THV and FUSER BIAS.

● Connection

1 Main Interface 5 SUPPLY(-489V)

2 MHV(-1240V) 6 OPC(-51V)

3 DEV(-338V) 7 THV(+1315V, -1000V)

4 BLADE(-389V) 8 FUSER BIAS(240V)

● Information

- SEC-CODE : JC44-00197A

- PBA Name : HVPS

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2. Product speciﬁcations and descriptions

2.2.5.10 Electrical Parts Location

1) Sensors

1 Cassette paper empty sensor 4 Feed sensor

2 MP paper empty sensor 5 Exit sensor

3 Regi sensor 6 Outbin full sensor

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2) Motor and clutch

\

X

Y

Z

[

2. Product speciﬁcations and descriptions

1 Main motor 3 Cassette Pick up clutch

2 Regi clutch 4 MP Pick up clutch

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3) Fan

Y

X

2. Product speciﬁcations and descriptions

1 Main fan 2 SMPS fan

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2. Product speciﬁcations and descriptions

2.2.6 Engine F/W Control Algorithm

2.2.6.1 Feeding

If feeding from a cassette, the drive of the pickup roller is controlled by controlling the solenoid. The on/off of the solenoid is controlled by controlling the general output port or the external output port. While paper moves, occurrence of Jam is judged as below.

ITEM Description

- After picking up, paper cannot be entered because paper is not fed.

- After picking up, paper entered but it cannot reach to the feed sensor in certain time

JAM 0

JAM 1

due to slip, etc.

- After picking up, if the feed sensor is not on, re-pick up. After re-picking up, if the feed sensor is not on after certain time, it is JAM 0.

- After the leading edge of the paper passes the feed sensor, the trailing edge of the paper cannot pass the feed sensor after a certain time.

- After the leading edge of the paper passes the feed sensor, the paper cannot reach the exit sensor after certain time.

*The paper exists between the feed sensor and the exit sensor.

JAM 2

- After the trailing edge of the paper passes the feed sensor, the paper cannot pass the

exit sensor after certain time.

2.2.6.2 Transfer

The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width Modulation). The each output voltage is changeable due to the PWM duty. The transfer voltage admitted when the paper passes the transfer roller is decided by environment recognition. The resistance value of the transfer roller is changed due to the surrounding environment or the environment of the set, and the voltage value, which changes due to the environments, is changed through AD converter. The voltage value for impressing to the transfer roller is decided by the changed value.

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2. Product speciﬁcations and descriptions

2.2.6.3 Fusing

The temperature change of the heat roller’s surface is changed to the resistance value through the thermistor. By converting the voltage value, which impressed to the resistance, to the digital value through the AD converter, the temperature is decided. The AC power is controlled by comparing the target temperature to the value from the thermistor. If the value from the thermistor is out of controlling range while controlling the fusing, the error stated in the below table occurs.

• Open Heat Error

When the engine operates the warm-up process, if the temperature of the ﬁxing unit is not higher than a speciﬁed temperature, the engine deﬁnes Open Heat Error. When this error is broken out, the engine stops all functions and keeps the error state. Also, the engine informs the error status of the main system. And then the error message is displayed at LCD window or LED informing the error status of the user.

• Low Heat Error

When the engine is at stand-by, printing or warm-up mode, if the temperature of the ﬁxing unit is lower than the speciﬁed temperature at each state and the lower temperature state is maintained during the speciﬁed time, the engine deﬁnes Low Heat Error. When this error is broken out, the engine stops all functions and keeps it at the error state. Also the engine informs the error status of the main system. And then the error message is displayed at LCD window or LED informing the error status of the user.

• Over Heat Error

For overall engine state, if the temperature of the ﬁxing unit is higher than the speciﬁed temperature and the temperature state is kept during the speciﬁed time, the engine deﬁnes Over Heat Error. When this error is broken out, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of the main system. And then the error message is displayed at LCD window or LED to inform the error status of the user.

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2. Product speciﬁcations and descriptions

2.2.6.4 LSU

LSU receives the image data from PVC or HPVC and make the latent image on OPC surface. It uses the single beam, LD. The errors related to LSU are as follows:

• By Lready

When the printing is started, the engine drives the polygon motor of LSU. After the speciﬁed time is elapsed, if the motor is not in a ready status, the engine detects the error that the polygon motor is not in a ready status. If this error happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of the main system and the error message is displayed at LCD window to inform the error status of the user.

• By Hsync

When the polygon motor is ready, the LSU sends out the signal called Hsync and used to synchronize with each image line. So, if the engine does not detect consecutively the signal for a ﬁxed time, it deﬁnes the Hsync Error. If this error happens, the engine stops all functions and keeps it at the error state. Also, the engine informs the error status of the main system and then the error message is displayed at LCD window to inform the error status of the user. LSU Error Recovery: If the LReady or Hsync error happens, the paper exits out beforehand. The engine mode is changed to recovery mode and the engine informs the main system of the engine mode. And the engine checks the LSU error. If the error doesn’t happen, the printing job.

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2. Product speciﬁcations and descriptions

2.2.7 S/W Descriptions

2.2.7.1 Overview

The software of ML-331x /337x series system is constructed with

1) Host Software part that the application software operated in Window and Web Environment, and

2) Firmware parts that is a Embedded software controls printing job.

2.2.7.2 Architecture

Host Software is made up of

1. Graphic User Interface that offers the various editing functions to user in Host,

2. Driver that translates the received document to a Printing Command language which printer can understand and transfers data to spooler,

3. Stand-alone Application that offers the various printing application, PSU(Printer Settings Utility), Printer Status Monitor, Network Management in Window system,

4. Web-based-Application that offers the same functions as Stand-alone Application and RDC(Remote Diagnosis Control) in Web environment.

Firmware is made up of

1. Application (Emulation) that is a interpreter translate data received from Host to a printing language (PCL, PS, GDI, etc.) to be able to make the user to take same output as originally one what composed in Host.

2. Kernel that control and management the whole procedure include of Control ﬂow and Printing Job before transfer to Engine system.

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2. Product speciﬁcations and descriptions

2.2.7.3 Data and Control Flow

- GD & PCL6 (PCL XL)

- Document Management System

- Network Administration

- Status Monitor

- Remote Control Panel

- Printer Settings Utility

- Network Administration

- Status Monitor

Application (Emulation)

- PCL

- PostScript

- etc

The above Block Diagram is explained that:

Host Side is made up of

1. Driver that is Windows application software translate printed data to one of printer language and create spooler ﬁle.

2. Web-based Application that offer a various printer additional functions, management of printing job, printer administration, Status monitor to monitoring the printer status by real time in Web, independent environment on OS.

3. Stand-alone Application that is a similar Window software as same as above 2,

4. Port Monitor that manages the network communication between spooler and Network Interface Card, or various additional application and Network Interface Card,(this is, at ﬁrst, make communication logical port, manage the data, transfer them from spooler to network port, and offer the result of printing).

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Firmware Side is made up of

1. Network Interface Card is that relay the communication between Host and kernel using various network protocol.

2. Kernel is that manages the ﬂow control of emulation procedure, receiving data from Host or Network card and printing with engine & rendering job,

3. Emulation is that interprets the various output data from selected emulation,

4. Engine is that prints rendered bit-map data to paper with required size and type by Kernel.

And then, for Job Spooling function for Multi-User, Multi-Printing that is occurred in Network printing and various additional printing functions, this Kernel use max. 10 Queuing systems in a memory.

In Printing, the two procedures are

(1) Case of using USB Port

- After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver

translate the all graphic data of it and send data to host spooler. And then the spooler sends the data stream to the printer via USB port.

- Kernel receives this data from Host, and then select emulation ﬁt to data and start selected one. After emulation job end, Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU).

- Engine print the received data to required paper with the sequential developing process.

(2) Case of using Network Interface Card

- After user start to print the wanted document to PCL string or compressed GDI bit-map data, Driver translate the all graphic data of it and send data to host spooler.

- If so, Port monitor managing network port receives data from spooler and sends a data stream to the Network Interface Card.

- Network interface card receives it and send to Kernel part.

- Engine print the received data to required paper with the sequential developing process.

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3. Disassembly and Reassembly

3.1 General Precautions on Disassembly

When you disassemble and reassemble components, you must use extreme caution. The close proximity of cables to moving parts makes proper routing a must. If components are removed, any cables disturbed by the procedure must be restored as close as possible to their original positions. Before removing any component from the machine, note the cable routing that will be affected.

Whenever servicing the machine, you must perform as follows:

1. Check to verify that documents are not stored in memory.

2. Be sure to remove the toner cartridge before you disassemble parts.

3. Unplug the power cord.

4. Use a at and clean surface.

5. Replace only with authorized components.

Releasing Plastic Latches

Many of the parts are held in place with plastic latches. The latches break easily; release them carefully. To remove such parts, press the hook end of the latch away from the part to which it is latched.

6. Do not force plastic-material components.

7. Make sure all components are in their proper position.

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3. Disassembly and Reassembly

3.2 Screws used in the printer

The screws listed in the table below are used in this printer. Please ensure that, when you disassemble the printer, you keep a note of which screw is used for which part and that, when reassembling the printer, the correct screws are used in the appropriate places.

Part Code Location Description Qty

6002-000440 DUPLEX SCREW-TAPPING;PWH,+,2,M3,L8,ZPC(BLK),SWRCH18A 5

6003-000196

6003-000261 SCREW-TAPTYPE;BH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 2

6003-000269 SCREW-TAPTYPE;BH,+,-,S,M3,L6,ZPC(WHT),SWRCH18A,- 3

6003-000196 MP SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 2

6003-000196

6003-000269 SCREW-TAPTYPE;BH,+,-,S,M3,L6,ZPC(WHT),SWRCH18A,- 3

6003-000282 SCREW-TAPTYPE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 4

6003-000269 DRIVE SCREW-TAPTYPE;BH,+,-,S,M3,L6,ZPC(WHT),SWRCH18A,- 6

6003-000196

6003-000261 SCREW-TAPTYPE;BH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 3

6003-000301 SCREW-TAPTYPE;BH,+,S,M4,L6,ZPC(WHT),SWRCH18A 1

6006-001078 FRAME-ETC SCREW-TAPTYPE;PH,+,WSP,B,M3,L10,ZPC(WHT),SWRCH18A 1

6003-000282 LSU SCREW-TAPTYPE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 5

6003-000196 COVER-TOP SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 3

6003-000196 COVER-FRONT SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 2

6003-000264 MP GUIDE-TRAY SCREW-TAPTYPE;PWH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 1

6003-000282 CARTRIDGE-TONER SCREW-TAPTYPE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 5

6003-000196 OPE SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 5

FRAME MAIN

FUSER

FRAME-ETC

SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 20

SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 5

SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 38

6003-000196 MAINLINE SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 9

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ML-331x/371x series

3. Disassembly and Reassembly

3.3 Disassembly procedure

3.3.1 Cover

1. Remove the cassette.

2. Open the front cover. Remove the toner cartridge.

3. Remove the front cover by releasing both hooks.

4. To remove the toper cover, rst, remove 2 screws.

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3. Disassembly and Reassembly

5. Open the rear cover. Remove 2 screws.

HookHook

6. Unplug a connector on the main board.

7. Lift up and release the top cover.

8. Close the rear cover. Remove the duplex unit.

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3. Disassembly and Reassembly

9. Remove the rear cover by releasing both hooks.

10. Remove the left cover by releasing hooks.

11. Remove 1 screw.

Remove the right cover by releasing hooks.

HookHook

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3. Disassembly and Reassembly

3.3.2 Main board

1. Remove the right cover. (Refer to 3.3.1 Cover)

2. Unplug all connectors on the main board.

3. Remove 4 screws.

4. Release the main board.

3.3.3 HVPS board

1. Remove the right cover. (Refer to 3.3.1 Cover)

2. Remove 5 screws.

3. Unplug all connectors on the HVPS board.

4. Release the HVPS board.

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3. Disassembly and Reassembly

3.3.4 SMPS board

1. Remove the right cover. (Refer to 3.3.1 Cover)

2. Unplug all connectors on the SMPS board.

3. Remove 4 screws.

4. Release the SMPS board.

3.3.5 Laser Scanning Unit (LSU)

1. Remove the top cover. (Refer to 3.3.1 Cover)

2. Unplug 2 at cables from the LSU.

3. Remove 3 screws.

4. Release the LSU.

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3. Disassembly and Reassembly

3.3.6 Fuser unit

CAUTION

The temperature gets high in the vicinity of the fuser unit. When replacing it, you may get burned. Before replacing it, make sure that fuser unit has cooled.

1. Open the Frame-Rear by pushing both green points.

Frame-RearFrame-Rear

2. Remove the Frame-Rear by releasing both

hooks.

3. Remove the exit sensor holder after removing 2 screws.

4. Remove 4 screws.

CAUTION

When reassembling the fuser unit, do not forget to tighten these screws.

5. Release the fuser unit.

Exit sensor holderExit sensor holder

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3.3.7 Main drive unit

3. Disassembly and Reassembly

1. Remove the left cover. (Refer to 3.3.1 Cover)

2. Remove the Bar coupler.

Bar couplerBar coupler

3. Remove the main drive unit after removing 6 screws.

4. Unplug the connector from the main motor.

5. Release the main drive unit.

NOTE When reassembling the main drive unit, tighten 6 screws in order as shown above.

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3. Disassembly and Reassembly

3.3.8 Feed drive unit

1. Remove the main drive unit. (Refer to 3.3.7)

2. Release the feed drive unit after removing 2 screws.

3.3.9 Pick up/ Regi/ MP clutch

1. Remove the feed drive unit.

2. For the clutch to require replacement, unplug the connector then replace it.

Regi.

Pick-up

MPRegi.

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3. Disassembly and Reassembly

3.3.10 Pick up roller

1. Remove the cassette and duplex unit.

2. Pull the small tap down, then release the pick up roller.

121

3.3.11 Transfer roller

1. Remove the top cover. (Refer to 3.3.1 Cover)

2. Release the LSU bracket after removing 4 screws.

3. Push the transfer roller holder to the center and release it.

4. Remove the transfer roller.

Transfer rollerTransfer roller

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3.3.12 MP unit

3. Disassembly and Reassembly

1. Remove the front / top / right cover.

2. Remove 4 screws.

3. Separate the MP lower from the MP upper.

MP pick up/ forward roller

MP retard roller

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3. Disassembly and Reassembly

3.3.13 OPE board

1. Remove the top cover. (Refer to 3.3.1 Cover)

2. Release the OPE board after removing 4 screws.

3.3.14 Bin-full sensor

1. Remove the top / left cover. (Refer to 3.3.1 Cover)

2. Release the bin-full sensor after unplugging the connector.

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3. Disassembly and Reassembly

3.3.15 Regi. / Feed / Empty sensor

1. Remove the cassette and duplex unit.

2. Remove the PLATE-FRAME BOTTOM after removing 4 screws.

3. Remove the sensor cover after removing 2 screws.

4. For the sensor to require replacement, unplug the connector then replace it.

Regi. sensor

Feed sensor

5. Remove the sensor cover after removing 2 screws.

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3. Disassembly and Reassembly

6. Unplug the connector then release the empty sensor.

Empty sensorEmpty sensor

3.3.16 Cassette roller (Retard roller)

1. Remove the cassette.

2. Open the COVER-CASSETTE.

3. Release the Retard roller.

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4. Alignment and Troubleshooting

4.1 Alignment and Adjustments

This chapter describes the main functions for service, such as the product maintenance method, the test output related to maintenance and repair, Jam removing method, and so on. It includes the contents of manual.

4.1.1 Control Panel

■ Type A

1 Eco Enters eco printing mode to reduce toner consumption and paper usage.

Stops an operation at any time and there are more functions.

• Printing demo page : Press and hold this button for about 5 seconds until

Service Manual ML-331x/371x series

(Cancel)

(Power) You can turn the power on and off with this button.

(Jam LED) Shows the status of jam occurance of your machine.

(Status LED) Shows the status of your machine.

the status LED blinks slowly, and release.

• Printing con guration sheets : Press and hold this button for about 3 seconds until the status LED blinks quickly, and release.

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■ Type B

4. Alignment and Troubleshooting

1 Display Shows the current status and prompts during an operation.

3 OK Con rms the selection on the display.

5 Eco Enters eco printing mode to reduce toner consumption and paper usage

10 Arrows Navigates available values by moving to the next or previous options.

(Menu) Enters menu mode and scrolls through the available menus.

(Back) Sends you back to the upper menu level.

(Cancel) Stops an operation at any time and there are more functions.

(Power) You can turn the power on and off with this button.

(Status LED) Shows the status of your machine.

(Jam LED) Shows the status of jam occurance of your machine.

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■ Type C

4. Alignment and Troubleshooting

1 Display Shows the current status and prompts during an operation.

3 OK Con rms the selection on the display.

5 Eco Enters eco printing mode to reduce toner consumption and paper usage

10 (WPS)

11 Arrows Navigates available values by moving to the next or previous options.

(Menu) Enters menu mode and scrolls through the available menus.

(Back) Sends you back to the upper menu level.

(Cancel) Stops an operation at any time and there are more functions.

(Power) You can turn the power on and off with this button.

(Status LED) Shows the status of your machine.

(Wireless LED) Shows the current status of the wireless network connection.

If your wireless access point supports Wi-Fi Protected Setup™ (WPS), you can con gure the machine easily without a computer.

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4.1.2 Understanding The Status LED

The color of the Status indicates the machine’s current status.

STATUS DESCRIPTION

Off • The machine is off-line.

Green Blinking • When the backlight slowly blinks, the machine is receiving data from

the computer.

• When the backlight blinks rapidly, the machine is printing data.

On • The machine is on-line and can be used.

• The machine is in power saver mode.

Red Blinking • A minor error has occurred and the machine is waiting for the error

to be cleared. Check the display message. When the problem is cleared, the machine resumes.

• Small amount of toner is left in the cartridge. The estimated cartridge life of toner is close. Prepare a new cartridge for replacement. You may temporarily increase the printing quality by redistributing the toner.

On • A toner cartridge has almost reached its estimated cartridge life

• The cover is opened. Close the cover.

• There is no paper in the tray. Load paper in the tray.

• The machine has stopped due to a major error.

Orange On A paper jam has occurred

Blue

On When the machine is connected to a wireless network, Wireless LED

lights on blue.

a. Estimated cartridge life means the expected or estimated toner cartridge life, which indicates the average capacity

of print-outs and is designed pursuant to ISO/IEC 19752. The number of pages may be affected by operating environment, printing interval, graphics, media type and media size. Some amount of toner may remain in the cartridge even when red LED is on and the printer stops printing.

b. Wireless model only

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4. Alignment and Troubleshooting

4.1.3 JAM Removal

4.1.3.1 Clearing paper jams

To avoid tearing the paper, pull the jammed paper out slowly and gently.

In tray 1

1. Open and close the front cover. The jammed paper is automatically ejected from the machine. If the paper does not exit, go to the next step. If the paper does not exit, go to the next step.

2. Pull out tray 1 .

In optional tray2

1. Pull out optional tray 2.

2. Remove the jammed paper from the machine.

3. Remove the jammed paper by gently pulling it straight out.

Service Manual ML-331x/371x series

If the paper does not move when you pull or if you do not see the paper in this area, stop and go to the next step.

3. Pull tray 1 half-way out.

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4. Alignment and Troubleshooting

4. Pull the paper straight up and out.

5. Insert the trays back into the machine. Printing automatically resumes.

In the multi-purpose tray

1. If the paper is not feeding properly, pull the paper out of the machine.

2. Open and close the top cover to resume printing.

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4. Alignment and Troubleshooting

Inside the machine

1. Open the front cover and pull the toner cartridge out, lightly pushing it down.

2. Remove the jammed paper by gently pulling it straight out.

In the exit area

1. Open and close the front cover. The jammed paper is automatically ejected from the machine. If you do not see the jammed paper, go to next step.

2. Gently pull the paper out of the output tray.

If you do not see the jammed paper or if there is any resistance when you pull, stop and go to the next step.

3. Replace the toner cartridge and close the front cover. Printing automatically resumes.

3. Open the rear cover.

4. Remove the jammed paper as shown in the following gure.

1 fuser door

5. Close the rear cover. Printing automatically resumes.

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4. Alignment and Troubleshooting

In the duplex unit area

1. Pull the duplex unit out of the machine.

2. Remove the jammed paper from the duplex unit.

4. Remove the jammed paper as shown in the following gure.

1 fuser door

5. Return the fuser door and the lever to their original position.

6. Close the rear cover. Printing automatically resumes.

If the paper does not come out with the duplex unit, remove the paper from the bottom of the machine.

Insert the duplex unit into the machine.

If you still do not see the paper, go to the next step.

3. Open the rear cover.

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4. Alignment and Troubleshooting

4.1.4 Useful menu item for service

a) Monitoring the supplies life.

To view the supply life indicators, follow the steps below:

1. Press “menu” on the control panel.

2. Press System Setup > OK > Maintenance > OK.

3. Press Supplies Info > OK.

4. Press OK to select the option you want.

b) Printing a report

This product provides several printable reports for maintenance purposes. These reports can be used to aid the diagnosis of print quality problems.

■ Demo page (Menu > Information > Demo page)

You can print the demo page to check whether your machine is printing properly or not.

■ Conﬁguration report (Menu > Information > Conﬁguration)

You can print a report on the machine’s overall con guration. It shows various SW version and current machine setting status.

■ Supplies Information report (Menu > Information > Supplies Info.)

You can print supplies’ information page. It shows consumable unit life status and toner using status.

■ Usage Counter (Menu > Information > Usage Counter)

You can print a usage page. The usage page contains the total number of pages printed.

c) Maintenance menu.

This menu allows you to maintain your machine. (Menu > System setup > Maintenance)

• CLR Empty Msg. : This option appears only when toner cartridge is empty.

• Supplies Info. : This item allows you to check how many pages are printed and how much toner are left in the cartridge.

• TonerLow Alert : If toner in the cartridge has run out, a message informing user to change the toner

cartridge appears. You can set the option for this message to appear or not.

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4. Alignment and Troubleshooting

d) Altitude adjustment

The print quality is affected by atmospheric pressure, which is determined by the height of the machine above sea level. The following information will guide you on how to set your machine to the best print quality or best quality of print. Before you set the altitude value, determine the altitude where you are.

4,000 m

(13,123 ft)

3,000 m

(9,842 ft)

2,000 m

(6,561 ft)

1 High 3 2 High 2 3 High 1 4 Normal

1,000 m

(3,280 ft)

1. Ensure that you have installed the printer driver with the provided Printer Software CD.

2. Double-click the Smart Panel icon on the Noti cation Area in Linux. You can also click Smart Panel on

the status bar in Mac OS X. For Windows user, select Start > Programs or All Programs > Samsung Printers > Samsung Easy Printer Manager.

3. Click Printer Setting.

If your machine is connected to the network, you can set the altitude via SyncThru™ Web Service.

4. Click Setting > Altitude Adjustment. Select the appropriate value from the drop-down list, and then click

Apply.

You can also set the altitude in System Setup > Altitude Adj. option on the machine’s display.

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4.1.5 Periodic Defective Image

If an image defects appears at regular intervals on the printed-paper, it is due to a faulty or damaged roller. Refer to the table below and check the condition of the appropriate roller.

No Roller Description

1 1st Pressure roller Background

3 Heat roller Black spot and fuser ghost

4 Charge roller 26.7 mm Black spot

5 Developer roller 36.78 mm Horizontal band

6 OPC drum 75.49 mm White and Black spots

7 Supply roller 69.57 mm Horizontal band

8 Transfer roller Ghost, Damaged image

Band Period

(mm)

Phenomenon Defective part

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Toner cartridge

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4. Alignment and Troubleshooting

4.1.6 Using the Easy Printer Manager program and smart panel

Smart Panel is a program that monitors and informs you of the machine status, and allows you to customize the machine’s settings. Smart Panel is installed automatically when you install the machine software.

To use this program, you need the following system requirements:

• Windows. Check for windows operating system(s) compatible with your machine.

• Mac OS X 10.3 or higher

• Linux. Check for Linux systems that are compatible with your machine.

• Internet Explorer version 5.0 or higher for ash animation in HTML Help.

If you need to know the exact model name of your machine, you can check the supplied software CD.

4.1.6.1 Using the Easy Printer Manager program (Windows only)

Easy Printer Manager is a Windows-based application that combines Samsung device settings into one location. Easy Printer Manager combines device settings as well as printing environments, settings/actions, launching applications, and so on. All of these features provide a gateway to conveniently use Samsung machine. Easy Printer Manager provides two different user interfaces for the user to choose from: the default user interface and the advanced settings user interface. Switching between the two interfaces is easy: just click a button.

Understanding Easy Printer Manager program

This interface is intended to be used by general device users in a small business or small home of ce environment. For Windows user, select Start > Programs or All Programs > Samsung Printers > Samsung Easy Printer Manager.

The Easy Printer Manager interface is comprised of various basic sections as described in the table that follows.

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4. Alignment and Troubleshooting

1 Printer List

The Printer List displays icons corresponding to discovered network or local printers’ error status.

This area gives you general information about your machine. You can check information, such as the machine’s model name, IP address (or Port name), and machine status.

2 Printer Information

Troubleshooting button: This button opens Troubleshooting Guide when

an error occurs. You can directly open the necessary section in the user’s guide.

Application

information

Includes links for changing to the advanced settings, preference, help, and about.

Displays Quick links to machine speci c functions. This section also includes links to applications in the advanced settings.

4 Quick links

If you connect your machine to a network, the SyncThru™ Web Service

window appears.

Displays information about the selected machine, remaining toner level

5 Contents Area

and paper. The information will vary based on the machine selected. Some machines do not have this feature.

6 Order Supplies

Click on the Order button from the supply ordering window. You can order replacement toner cartridge(s) from online.

Click the Help button from the upper-right corner of the window and click on any option you want to know

about.

4.1.6.2 Using the Smart Panel program (Macintosh and Linux only)

Smart Panel is a program that monitors and informs you of the machine’s status, and allows you to customize the machine’s settings. For Macintosh, Smart Panel is installed automatically when you install the machine software. For Linux, you can download Smart Panel from the Samsung website.

Smart Panel overview

[

You can view the level of toner remaining in each toner cartridge. The

1 Toner Level

machine and the number of toner cartridge(s) shown in the above window may differ depending on the machine in use. Some machines do not have this feature.

2 Buy Now You can order replacement toner cartridge(s) from online. 3 User’s Guide You can view the online User’s Guide.

4 Printer Setting

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You can con gure various machine settings in the Printer Settings Utility window. Some machines do not have this feature.

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4.1.7 Updating Firmware

This chapter includes instructions for updating the printer rmware. You can update the printer rmware by using one of the following methods :

• Update the rmware by using the USB port.

• Update the rmware by using the network.

4.1.7.1 Update the ﬁrmware by using the USB port

[Upgrading preparations]

- usblist2.exe : Tool which sends rmware data to printer.

- Firmware le to upgrade

[Upgrade Procedure]

1. Turn the machine off.

2. Connect USB cable to printer.

3. Turn the machine on. Check if the printer is the ready status.

4. Drag the rmware le and Drop down on the usblist2.exe.

And then rmware update will be started automatically.

5. When upgrading is completed, machine is automatically re-booting.

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4.1.7.2 Update the ﬁrmware by using the network

[Upgrading preparations]

- Wired or Wireless Network connection is established

- Firmware le to upgrade

[Upgrade Procedure]

1. Open Web-browser and input IP address of machine. Click “Login”.

2. Log-in Admin Mode

ID: admin, PW: sec00000

3. Select Maintenance menu and click “upgrade wizard”

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4. Select rmware le using “browser” button and press next button.

5. SyncThru will check verify rmware le and compare version and press next button.

6. Machine starts upgrading. SyncThru will return home page after upgrading is completed.

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4.1.8 Tech Mode

4.1.8.1 Entering the Tech Mode

In service (tech) mode, the technician can check the machine and perform various test to isolate the cause of a malfunction. While in Tech mode, the machine still performs all normal operations.

NOTE - There is no tech mode for LED type model (ML-331xD,371xD)

To enter the Tech Mode

To enter the Tech Mode, press “ Menu + Back + Left + Right + OK + Cancel” in sequence

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4.1.8.2 Tech Mode Menu

Depth 1 Depth 2 Depth 3 Depth 4 Data Setup

Report

EDC Mode NVM Read Write 103-Time

Counter Reset Fuser

Pickup Roller Tray 1

Tray 2

MP Tray

Retard Roller Tray1

Tray2

Transfer Level Level 0 ~3

Density Level Level 0 ~3

Toner Low Level [1~30]: 10 %*

Paper Substitution Off *

Supplies Info Printing…

Event Log Printing…

Job Duty Report Printing…

Density Report Printing…

Frame JIG Printing…

Usage Counter Printing…

105-Duty

106-Deve

107-Transfer

109-Temp Offset

110-LD Power

NVM Initialize Initialize Now

Test Routines 100-Motor

101-Clutch

102-Sensor

105-MHV Bias

106-Dev Bias

107-Transfer Bias

109-Fuser Heater

112-ACR

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4.1.8.3 Tech Mode Menu description

1) Data Setup

Counter Reset

This menu can reset the counts for the Fuser or Pick up roller or Transfer roller. When replacing these parts, you must do this menu.

Toner Low Level

When the toner remains less than setting up level, the machine notify user of toner low.

Paper Substitution

Between A4 and Letter size paper, print job can be executed without paper mismatch message, when the setting value is “On”.

2) Report

Supplies Info

It shows consumable unit life status and toner using status.

Event Log

It shows various kinds of errors which can be occurred in machine. It also store history error count how many errors are issued.

Job Duty Report

It shows printing usage by print job duty.

Density Report

It shows image density control history.

Usage Counter

It contains the total number of pages printed.

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3) EDC mode

NVRAM Read/Write

This menu can change a con guration value for engine rmware.

Code LCD Meaning Default Max/Min

103-0040 0040-Pick Int Delay Change time interval for paper pick-up 0 0~100(*100msec)

103-0050 0050-Pick Spl Delay Change time interval for paper pick-up 0 0~100(*100msec)

105-0030 0030-MHV DC K Charger HV Black DC Duty 720 50~900

106-0030 0030-Deve DC K Developer DC Black 431 50~900

107-0030 0030-THV K Transfer1 HV Black Duty 520 50~900

109-0000 0000-Ready Temp Target Temperature during standby mode. 10 0~15

109-0010 0010-Print Temp Target Temperature during run mode. 5 0~10

109-0030 0030-101-185mm Temp Offset temperature required on thermistor B for

paper width.

109-0040 0040-186-216mm Temp Offset temperature required on thermistor B for

paper width.

109-0050 0050-60gms Temp Media type offset for fuser roll temperature. 5 0~15

109-0060 0060-90gms Temp Media type offset for fuser roll temperature. 5 0~10

109-0070 0070-Bond Temp Media type offset for fuser roll temperature. 5 0~10

109-0080 0080-Trans Temp Media type offset for fuser roll temperature. 5 0~10

109-0090 0090-CardStock Temp Media type offset for fuser roll temperature. 5 0~10

109-0100 0100-Envelopes Temp Media type offset for fuser roll temperature. 5 0~10

109-0110 0110-Labels Temp Media type offset for fuser roll temperature. 5 0~10

110-0070 0070-LD Power K Black LD Power at Normal Speed 470 50~900

5 0~15

Test Routines

This menu can perform the operation test for the main components.

Code LCD Meaning

100-0000 Main BLDC Motor Main BLDC Motor is On/Off On[Off] Engine

State

Displayed

Components

100-0010 Main BLDC Motor

Ready

100-0260 SMPS Fan Run Start/Stop developer fan run On[Off] Engine

101-0000 Bypass Feed Clutch Engages drive to pick up a paper from bypass

101-0010 T1 Pick-Up Clutch Engages T1 pick up clutch from tray 1. On[Off] Engine

101-0020 T2 Pick-Up Clutch Engages T2 pick up clutch from tray 2.

101-0050 Registration Clutch Engages drive to registartion roller. On[Off] Engine

101-0190 Out-Bin Full Sensor Detect when a paper is at Duplex Ready sensor. High[Low] Engine

Service Manual ML-331x/371x series

Detect if Main BLDC Motor runs at normal speed High[Low] Engine

On[Off] Engine

Tray(MP Tray).

On[Off] Engine

(Optional)

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Code LCD Meaning

State

Displayed

Components

102-0010 T1 Paper Empty Sensor Detect when paper is in Tray1. High[Low] Engine

102-0080 T2 Paper Empty Sensor Detect when paper is in tray2. High[Low] Engine

102-0280 Bypass Paper Empty

Detects when paper is in Bypass Tray(MP Tray). High[Low] Engine

Sensor

102-0290 Feed Sensor Detect when a paper is at Feed sensor. High[Low] Engine

102-0300 T2 Feed Sensor (or

Door Open)

Detect when a paper is at T2 Feed sensor. (optional)

High[Low] Engine

102-0360 Regi. Sensor Detect when a paper is at Regi. sensor. High[Low] Engine

102-0370 Exit Sensor Detect when a paper is at Exit. sensor. High[Low] Engine

105-0030 Black MHV Bias Black MHV bias voltage on at normal drive level On[Off] Engine

106-0030 Black Dev Bias Black Dev bias voltage on at normal drive level On[Off] Engine

107-0030 Black THV Bias Black THV bias voltage on at normal drive level On[Off] Engine

107-0031 Black THV(-) Bias Black THV bias voltage on at normal drive level On[Off] Engine

107-0070 Black THV Bias Read Detect what the THV value is on the THV Roller Numeric 3

Engine

digits

109-0000 Fuser Temperature A Detects what the temperature A is on fuser. Numeric 3

Engine

digits

109-0040 Fuser Fan Run Fuser Fan Motor On/Off On[Off] Engine

109-0050 Fuser Bias Fuser bias voltage on at normal drive level On[Off] Engine

110-0000 LSU Motor1 Run Ready Detects if LSU motor1 runs at normal speed. High[Low] Engine

110-0060 LSU Motor1 Run LSU Motor1 On/Off On[Off] Engine

110-0110 LSU LD Power4 LSU LD4 Power On/Off (black) On[Off] Engine

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Power On

Red LED on / Error message is displayed.

OPE LED

Green OK?

Print(test pattern)

printing

Quality is

Nomal?

Refer to "Solution

of Image Problem"

See the troubleshooting for error code

END

- No Power

- Power Module error

- Main PBA

OPE LED

ON?

4.2 Troubleshooting

4.2.1 Procedure of Checking the Symptoms

Before attempting to repair the printer rst obtain a detailed description of the problem from the customer.

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4.2.1.1 Basic Check List

1. Check the Power.

• Check that the power switch is turned on.

• Check that the power cable is plugged into the outlet and the printer.

• Check the voltage of the power outlet.

2. Check the LED of Panel.

• Is there OPE LED ON?

--> If not check power cable, switch SMPS or Main board.

• Is the abnormal Lamp?

--> Check the main PBA and cable harness.

3. Check the Paper Path

• Is there a Paper Jam?

--> Remove any paper fragments caught in the paper path.

• Paper Jam occurs repeatedly at a speci c point in the Paper Path

--> Open the fuser cover, Jam clear.

--> Dismantle the machine and carefully inspect the region where the jam occurs. (Especially, check if paper fragments are caught in the Fuser

4. Print the Information Page (Conﬁguration).

• Try printing a test page from a computer.

--> If there is an error check cables and driver installation.

5. Check the Print Quality.

• Is there are a Print Quality Problem?

--> Refer to the image quality problem.

6. Check consumables (toner etc.).

• Using the keys print the Test Pattern.

--> Expected life of various consumable parts, compare this with the gures printed and replace as

required

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4.2.1.2 Initial Inspection

1. Check Power part

1. The printer does not work no matter how long you wait.

A. Is the Power Switch (printer and wall socket) turned on ? B. Is the Power Cord connected to the printer correctly ? C. Is the Power cord connected to the wall socket correctly ? D. Is wall socket working ? E. Is the unit rated at the same voltage as the supply ?

2. Does the Fan work when power is turned on?

A. Check the connectors on the SMPS. B. Check the fuses in the SMPS.

2. Check the Installation Environment.

1. Ensure the installation surface is at, level and free from vibration.

If necessary move the printer.

2. Ensure that the temperature and humidity of the surroundings are within speci cation

If necessary move the printer.

3. Ensure that the printer is position away from any air conditioning or other heating or cooling equipment.

Also ensure that is not positioned in a direct draft from any air conditioning, fan or open window.

If necessary move the printer.

4. Ensure the printer is not positioned in direct sunlight.

If it is unavoidable use a curtain to shade the printer.

5. Ensure the printer is installed in a clean dust free environment.

Move the printer to clean area if necessary.

6. Some industrial or cleaning processes give of fumes which can affect the printer.

Move the printer away from this type of air pollution

3. Check paper type.

1. Use only paper which is of a suitable quality, weight and size?

See the user guide.

4. Check the overall condition of the printer

1. Is the printer properly maintained ?

Clean the Paper Transport Passages. Any rollers with dirt surfaces should be cleaned or replaced.

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4.2.2 Error Message and Troubleshooting

Messages appear on the Smart Panel program window or on the control panel to indicate machine status or errors. Refer to the tables below to correct the problem.

Error Code Error Message

A1-1110 Error #A1-1110: Turn off then on. 26 page

C1-1110 C1-1120 C1-1140

C1-1411 Install toner 28 page

C1-1512 Not Compatible Toner cartridge. 28 page

H1-1210 Paper jam in Tray2. 29 page

H1-1252 Paper is empty in Tray2. 29 page

M1-1110 Paper Jam in Tray1. 30 page

M1-1610 Paper Jam in MP tray. 30 page

M1-5112 Paper is empty in tray 1. 31 page

M1-5612 Paper Empty in MP Tray. 32 page

M2-1110 Paper Jam inside machine. 33 page

M2-2110 Paper Jam inside machine. 34 page

M2-2310 Paper Jam bottom of duplex. 34 page

Prepare new cartridge Replace new cartridge Replace new cartridge

Troubleshooting

Page

27 page

M3-1110 Paper Jam in exit area. 35 page

M3-2130 Output bin full. Remove paper. 35 page

S2-4110 Door open. Close it. 36 page

S6-3123 Network Problem: IP Con ict. 37 page

S6-3128 802.1x Network Error. 37 page

U1-2320 Error #U1-2320 Turn off then on. 38 page

U1-2330 Error #U1-2330 Turn off then on. 38 page

U1-2340 Error #U1-2340 Turn off then on. 39 page

U2-1111

U2-1113

Error #U2-1111 Turn off then on. Error #U2-1113 Turn off then on.

40 page

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● Code

A1-1110

● Error message

Error #A1-1110: Turn off then on.

● Symptom / Cause

After working the main BLDC motor, the Ready signal has not occurred within 1 sec.

1. Harness is defective. Connector is not connected properly.

2. OPC coupler in the toner cartridge has overloaded.

3. Main BLDC motor is defective.

4. Engine board is defective.

● Troubleshooting method :

※First, turn the machine off then on. If the error persists, refer to the following.

1. Check if the motor connector is connected properly. Reconnect it.

2. OPC coupler has overloaded. After removing the toner cartridge, rotate the OPC coupler. (Spec : 6 kgf.cm) If there is any damage, the OPC coupler can’t rotate well. Replace the toner cartridge.

3. The main BLDC motor is defective.

- Unplug the connector from the motor carefully.

- Replace the main BLDC motor with new one.

4. If the problem persists, replace the main board.

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● Code

C1-1110 / C1-1120 / C1-1140

● Error message

Prepare new cartridge / Replace new cartridge / Replace new cartridge

● Symptom / Cause

The remaining toner cartridge is less than 10% The toner cartridge is at the end of its life.

● Troubleshooting method

1. Print the supply information report. Check the life remaining of the toner cartridge. If its life is at the end, turn the machine off and replace the toner cartridge with new one.

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● Code

C1-1411

● Error message

Install toner.

● Symptom / Cause

The toner cartridge is not installed.

● Troubleshooting method

1. Turn the machine off then on.

2. Remove the toner cartridge. Thoroughly roll the cartridge ve or six times to distribute the toner evenly inside the cartridge. And reinstall the toner cartridge.

● Code

C1-1512

● Error message

Not Compatible Toner cartridge.

● Symptom / Cause

Toner cartridge is not compatible.

● Troubleshooting method

1. Print the supply information report. Check information of the toner cartridge.

2. If the toner cartridge is not a Samsung genuine toner cartridge, replace with new one.

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● Code

H1-1210

● Error message

Paper jam in Tray2.

● Symptom / Cause

A paper jam was detected in the feed area of the tray2.

1. Paper was inserted abnormally or was not loaded in the cassette properly.

2. Pick Up unit has a problem.

● Troubleshooting method

1. Open the Tray2 and remove the jammed paper.

2. If there is any defective part in the pick up unit, replace it.

● Code

H1-1252

● Error message

Paper is empty in Tray2.

● Symptom / Cause

Paper is empty in Tray2. The status LED is red.

1. There is no paper in the tray2.

2. Actuator-Paper Empty is defective.

3. Photo Sensor is defective or connection is bad.

4. Main Board is defective.

● Troubleshooting method

1. Load the paper in the tray2.

2. If the Actuator-Paper Empty is defective, replace it.

3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly.

4. If the problem persists, replace the Main Board.

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● Code

M1-1110

● Error message

Paper Jam in Tray1.

● Symptom / Cause

The jammed paper has occurred in the tray1.

1. Pick-Up or Torque Limiter Roller is contaminated or worn out.

2. There is some obstacles in the paper path.

● Troubleshooting method

1. Clear the jammed paper. If the problem persists, check the following.

2. While pushing the Paper Empty Sensor, send the printing data. Check if the pick up roller is rotating normally.

3. Check if there is any obstacles in the paper path (from Pick-Up to Feed Sensor). The feed roller should be especially checked.

4. Print out the Supplies Information. Check the Tray 1 Roller Life and Tray1 Torque Limiter Life. If the life came to the end, replace the relative roller.

● Code

M1-1610

● Error message

Paper Jam in MP tray.

● Symptom / Cause

The jammed paper has occurred in the MP tray.

1. MP Pick-Up or MP Torque Limiter Roller is contaminated or worn out.

2. There is some obstacles in the paper path.

● Troubleshooting method

1. Clear the jammed paper. If the problem persists, check the following.

2. While pushing the Paper Empty Sensor, send the printing data. Check if the pick up roller is rotating normally.

3. Check if there is any obstacles in the paper path (from Pick-Up to Feed Sensor). The feed roller should be especially checked.

4. Print out the Supplies Information. Check the Tray Roller Life and Tray Torque Limiter Life. If the life came to the end, replace the relative roller.

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● Code

M1-5112

● Error message

Paper is empty in tray 1.

● Symptom / Cause

Paper is empty in Tray1. The status LED is red.

1. There is no paper in the tray1.

2. Actuator-Paper Empty is defective.

3. Photo Sensor is defective or connection is bad.

4. Main Board is defective.

● Troubleshooting method

1. Load the paper in the tray1.

2. If the Actuator-Paper Empty is defective, replace it.

3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly.

Empty

Empty actuator

actuator

Empty sensor

4. If the problem persists, replace the Main Board.

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Samsung ML-331x, ML-371x Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1. Precautions

1.1 Safety Warning

1.2 Caution for safety

1.3 ESD Precautions

2.1.1 Product Overview

2.1.2 Features by models

2.1.4 Model Comparison Table

2.2 Product Description

2.2.1 Front View

2.2.2 Rear View

2.2.3 Paper Path

2.2.4 System layout

2.2.6 Engine F/W Control Algorithm

2.2.7 S/W Descriptions

3. Disassembly and Reassembly

3.1 General Precautions on Disassembly

3.2 Screws used in the printer

3.3 Disassembly procedure

3.3.1 Cover

3.3.2 Main board

3.3.3 HVPS board

3.3.4 SMPS board

3.3.5 Laser Scanning Unit (LSU)

3.3.6 Fuser unit

3.3.7 Main drive unit

3.3.8 Feed drive unit

3.3.9 Pick up/ Regi/ MP clutch

3.3.10 Pick up roller

3.3.11 Transfer roller

3.3.12 MP unit

3.3.13 OPE board

3.3.14 Bin-full sensor

3.3.15 Regi. / Feed / Empty sensor

3.3.16 Cassette roller (Retard roller)

4. Alignment and Troubleshooting

4.1 Alignment and Adjustments

4.1.1 Control Panel

4.1.2 Understanding The Status LED

4.1.3 JAM Removal

4.1.4 Useful menu item for service

4.1.5 Periodic Defective Image

4.1.6 Using the Easy Printer Manager program and smart panel

4.1.7 Updating Firmware

4.1.8 Tech Mode

4.2 Troubleshooting

4.2.1 Procedure of Checking the Symptoms

4.2.2 Error Message and Troubleshooting