SAMSUNG ML5100AXEU Service Manual

SERVICE

LASER PRINTER

ML-5100A

Manual

LASER PRINTER CONTENTS

1. Precautions

2. Specifications

3. Disassembly and Reassembly

4. Troubleshooting

5. Exploded Views and Parts List

6. Electrical Parts List

7. Schematic Diagrams

ELECTRONICS

P/N. JC68-00073A Rev. 1.00

Samsung Electronics 1-1

1. Precautions

1-1 Safety Precautions

Read each caution carefully:

1. Do not use this printer near water or when exposed to inclement weather.

2. Do not place this printer on an unstable cart, stand or table; the product may fall, causing serious damage to the product.

3. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation and to protect the printer from everheating, do not block or cover any of these openings. Do not place the printer in an enclosure unless the enclosure provides adequate ventilation.

4. Never push objects of any kind into the printer through the cabinet ventilation slots as they may touch dangerous high voltage points, create short circuits, cause a fire, or produce an electrical shock. Never spill liquid of any kind on the printer.

5. Do not place the printer in a location where someone may trip on the cords.

6. Select a work surface that is large enough to hold the printer.

7. Position the printer within six feet of the computer and within five feet of an electrical outlet.

8. Operate this printer using the power source (110V, 220V, etc) indicated on the marking label. If you are not sure of the type of power source available, consult your dealer or local power company.

9. If you need to use an extension power cord with this printer, make sure that it uses a three-wire grounded cord and that the total ampere ratings for all of the products using the extension do not exceed the extension cord ampere rating. Also, make sure that the total of all products plugged into the wall outlet does not exceed 15 amperes.

10. Do not allow anything to rest on the power cord or data communications cable.

11. Unplug this printer from the wall outlet before cleaning. Do not use liquid cleaners or aerosol sprays. Use a damp cloth for cleaning.

12. Do not touch the surface of the photo-sensitive drum as marks or scratches may impair print quality.

13. Do not expose the drum unit to direct light for prolonged periods.

14. Use only standard papers, OHP films, and approved envelopes. Feed OHP films though the manual feed slot only. See specifications for approved papers and envelopes.

15. Other than replacing consumables such as paper and toner, refer all questions to qualified service personnel.

WARNING : NEVER OPERATE AND SERVICE THE PRINTER WITH THE

PROTECTIVE COVER REMOVED FROM LASER/SCANNER ASSEMBLY. THE REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN DAMAGE YOUR EYES.

Note :

Requirements for AC power are described on the label affixed to the rear of the printer. Check the AC voltage rating requirement before use.

1. Before disassembly, pull the power plug from the AC power connector.

2. To avoid spilling toner inside the machine, do not turn the printer over or on its side before removing the developer cartridge.

3. Faulty installation of DRAMs may cause permanent damage to the Laser Printer.

4. Use only+5V power for video controller-related circuitry.

5. When replacing parts, use only the same type of part as the original. Replacing components with a second vendorÕs part may cause faulty operation.

6. Check the insulation between the blades of the AC plug and accessible conductive parts (examples : metal panels and input ports).

7. Insulation Checking Procedure: Disconnect the power cord from the AC power source. Connect an insulation resistance meter (500V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see left) should be greater than 1 megaohm.

8. Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

9. Always connect a test instrumentÕs ground lead to the

instrument chassis ground before connecting the positive lead; always remove the instrumentÕs ground lead last.

1-2 Samsung Electronics

Precautions

1-2 Servicing Precautions

CAUTION : Be sure the power is off to the

chassis or circuit board, and observe all other safety precautions

1. Immediately before handling any semiconductor components assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist strap device. (Be sure to remove the strap before applying power to the unit under test to avoid potential shock.)

2. After removing ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4. Use only a ground-tip soldering iron when soldering or desoldering ESDs.

5. Use only anti-static solder removal device. Some solder removal devices are not rated as Òantistatic;Óthese can accumulate sufficient electrical charge to damage ESDs.

6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are package with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7. Immediately before removing the protective 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. Minimize body motions when handling unpackaged replacement ESDs. Motion such as your clothes brushing together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an ESC.

9. Handle ICs and EPROMs carefully to avoid bending a pin.

10. Pay attention to the direction of parts when mounting

or inserting them on a PCB.

11. Components can be permanently damaged if heated

for longer than necessary while welding. All components are susceptible to heat damage.

1-3 ESD Precautions

Some semiconductor (Òsolid stateÓ) devices are easily damaged from static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits (ICs), Large-Scale Integrated circuits (LSIs), some field-effect transistors, and semiconductor chip components. The following techniques will reduce the occurrence of component damage caused by static electricity:

Emulation PCL5e,PCL6

Interface Centronics IEEE- P1284 compatible bi-directional (Nibble, Byte, ECP)

USB (Universal Serial Bus)

Print Speed 8 PPM (A4 Size, 5 % Character Pattern)

Print Method Non-impact Electrophotography, Laser Beam

Resolution 600 X 600 DPI

Memory Standard: 4 Mb

Expandable up to 36 Mb

Operating Environment Temperature : 5 ~ 32.5 oC,

Humidity: 20 ~ 85 % RH

Storage Environment Temperature : -20 ~ 40 oC,

Humidity: 10 ~ 95 % RH

Weight Net : 7.5 kg (max.),

Gross : 10 kg (max.)

Dimension 345 (W) X 365 (D) x 224 (H) mm

Certification & Compliance CE, TUV, SEMKO, NEMKO, DEMKO, C-tick

FCC, UL, CSA, CDRH, CB, EPA

2. Specifications

2-1 General

Samsung Electronics 2-1

2-2 Samsung Electronics

Specifications

Input Voltage USA : AC 100~127 V , 50/60 Hz ± 3 Hz (Normal : 115V)

EUROPE : AC 200~240 V , 50/60 Hz ± 3 Hz (Normal : 230V)

DC Output Voltage

Line Regulation 24 V ± 3 %

5 V ± 2 %

Load Regulation 24 V - 3 %/+10 %

5 V ± 3 %

Ripple Noise 24 V : 120 mV (Peak 400 mV)

5 V : 50 mV (Peak 100 mV)

Over Current Protect 24 V : 2.7 A ± 10 % (by C't )

5 V : 1.5 A ± 10 % (by C't )

Power Consumption Max. 450 W Everage: 200 W

Power Save Mode: Less than 15W

Warming Up Time 20 seconds or less

First Print Time Idle mode : 17 seconds or less

Power Save mode : 30 seconds or less

Acoustic Noise Standby : 33 dB or less

Sleep Mode: Background level Operating : 50 dB or less

Reliability

Insulation Resistance 10 Mohm or less (at DC 500 V) Dielectric Strength AC 1500 V (DC 2100 V), 10 mA Ground Continuous 0.1 ohm or less Voltage DIP Rated voltage ± 15 %

AC Impulse Noise AC 1000 V 10, 100, 200, 400, 1000 ns

Leakage Current 3.5 mA or less Surge 0.5 ~ 4 kV, 0.25 ~ 2 kA Ozone Emission 0.1 ppm or less (8 hours) Top Cover Open Isolating the input power of the LSU, high voltage part, and fuser Overcurrent Protect Fuse inside the Engine Controller

Fusing System

Trouble Sensing The temperature doesn't rise to the specific temperature within a

specific time. Fuser error occurs if the temperature is too high. Overheat Sensing 240 ~ 250 oC (The thermostat cuts off the Fuser from the power.) Thermistor Open Sensing Without the initial temperature change of the Fuser

Source of Light Laser Diode (LSU)

Developer

Developing Non-magnetic contact developing Charging Conductive roller charging Density Adjustment Dark, Medium Transfer System Pre-transfer by LED & conductive roller Fusing System Temperature & Pressure Ozone Emission 0.02 PPM or less (8 hours)

2-2 Electrical

Samsung Electronics 2-3

Specifications

Conditions

Paper Normal paper (75 g/m2) Environment Temperature : 20 ~ 25 oC, Humidity : 40 ~ 60 % RH

Print Quality

Image Density min. 1.3 Background max. 1.0 Uniformity max. 0.2 (including continuous print) Fusing min. 80 % (all black) Start Position Top : x ± 3 mm, Side : y ± 3 mm (from left) Skew Top : max. ± 1.5 mm/200 mm

Side : max. ± 1.5 mm/250 mm Orthogonality ± 1.0 mm Horizontal Scan ± 0.5 mm/208 mm

(Bowed Line Skew : S600,0909 pattern) Special Paper Exception Image Density : min. 1.0 (envelope)

Fusing : min. 70 % (all black, envelope/OHP/postcard) Paper Jam 1/2,000 or less Paper Curl First : 16 mm or less (10 sheets)

After Cooling: 12 mm or less (10 sheets)

2-3 Print Quality

Toner Cartridge

Type One-cartridge type Life Span Built-in toner cartridge : 5,000 pages at 5 % coverage

Optional toner cartridge: 5,000 pages at 5 % coverage

Note: Its duration may last longer under Econo mode.

Memory (ML-5100A only) Memory RAM: 4,8, 16, 32 Mb (memory is expandable to 36 Mb)

2-4 Option

2-4 Samsung Electronics

Specifications

Input Paper Size

Paper Type Size Feeding Source

A4 210 x 297 mm Paper Tray or Manual feeder Letter 216 x 279 mm Paper Tray or Manual feeder B5 (ISO) 176 x 250 mm Paper Tray or Manual feeder Executive 184 x 267 mm Paper Tray or Manual feeder Folio 216 x 330 mm Paper Tray or Manual feeder Legal 216 x 356 mm Paper Tray or Manual feeder Com-10 Envelope 105 x 241 mm Manual feeder only Monarch Envelope 98 x 191 mm Manual feeder only DL Envelope 110 x 220 mm Manual feeder only C5 Envelope 162 x 229 mm Manual feeder only C6 Envelope 114 x 162 mm Manual feeder only A5 Envelope 148 x 210 mm Manual feeder only Transparency A4 or Letter Manual feeder only Label paper A4 or Letter Manual feeder only *Others Width: 75-216 mm, Length: 125-356 mm Paper Tray or Manual feeder

Feeding Source Paper tray and manual feeder

Paper Weight 60 ~ 163 g/m2(16 ~ 28) , Cardstock/other : 24 ~ 43 lb

Input Paper Capacity Paper tray: 150 sheets, Manual feeder : 1 sheet at a time

Paper Stacker Capacity Face down : 100 sheets, Face up : 1 sheet

Paper Limitations -Adhesive label sheets specifically designed for laser printers

-Transparencies specifically designed for laser printers

-Envelopes with peel-off adhesive strips or more than one fold-over flap to seal must have adhesive compatible with the heat and pressure of the printerÕs fusing process.

Unacceptable Papers -Paper with embossed lettering, perforations, or rough texture

-Paper with which color was added after the paper was made

-Paper forms whose ink is not for laser printing

2-5 Paper

3. Disassembly and Reassembly

3-1 Removal Procedures

Cautions:

¥Be sure to unplug the power cord whenever you are working on the printer with one of the covers

removed.

¥Be sure to remove the toner cartridge before you repair parts.

Releasing Plastic Latches

Samsung Electronics 3-1

Many of the parts are held in places 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.

3-2 Face-Up Cover and Front Cover

1. Place your fingers on both sides of the face-up cover, push the cover, and pull it down.

2. Bend the cover slightly to release the tabs at the end, then remove the cover.

3-2 Samsung Electronics

Disassembly and Reassembly

3. Open the front cover with hand. 5. Unlatch the front cover, then remove the front cover.

4. Remove a screw securing the front cover to the

main frame.

3-3

Samsung Electronics

Disassembly and Reassembly

3-3 Panel Board and Board Cover

1. Before you remove these parts, you should

remove:

-Face up cover and Front cover (see page 3-1)

2. From the front cover, remove two screws, then remove the board cover.

3-4 Transfer Roller

1. Open the front cover with hand.

2. Remove the transfer roller cap.

3. To remove the transfer roller, pull up the tab to release the roller, then take it out.

Cap

Panel board

Board cover

3-4 Samsung Electronics

Disassembly and Reassembly

3-5 Top Cover and Rear Cover

1. Before you remove these covers, you should remove:

-Face up cover and Front cover (see page 3-1)

2. Remove three screws.

3. Unlatch the tabs on the left and right side end of the cover, then take out the rear cover.

4. Remove two screws, and remove the top cover.

Unlatch the tabs at both sides to remove the cover.

3-6 Side Covers (Left, Right)

1. Before you remove these side covers, you should remove:

-Face up cover and Front cover (see page 3-1)

-Top cover and Rear cover (see page 3-4)

2. Remove two screws on the back of the covers.

3. Unlatch the left and right side covers, and remove them.

3-5Samsung Electronics

Disassembly and Reassembly

3-7 SMPS/Engine Control Board

1. Before you remove the board, you should remove:

-All covers (see pages 3-1, 3-4)

2. Turn the printer upside down.

3. Remove three screws securing the shield, then remove the shield.

4. Unplug all the connectors from the SMPS, then take out the SMPS and the engine board.

3-8 Control Board

1. Before you remove the control board, you should remove:

-All covers (see pages 3-1, 3-4)

2. Unplug all the connectors from the control board, remove three screws, and take out the control board.

Shield

SMPS and Engine board

Control Board

3-6 Samsung Electronics

Disassembly and Reassembly

3-9 Joint Board

1. Before you remove the joint board, you should remove:

-All covers (see pages 3-1, 3-4)

-SMPS (see page 3-5)

2. Unplug all connectors from the joint board, remove three screws, then remove the joint board.

3-10 Sensor Board

1. Before you remove the sensor board, you should remove:

-All covers (see pages 3-1, 3-4)

-SMPS (see page 3-5)

2. Remove two screws, unplug all connectors from the sensor board, then remove the board.

3-7Samsung Electronics

Disassembly and Reassembly

3-11 Gear Bracket

1. Before you remove the gear bracket, you should remove:

-All covers (see pages 3-1, 3-4)

2. Remove six screws securing the gear bracket, unplug the connector from the motor, then remove the gear bracket.

3-12 Motor

1. Before you remove the motor, you should remove:

-All covers (see pages 3-1, 3-4)

-Gear bracket (see page 3-14)

2. Remove three screws, then remove the motor.

Motor

Gear bracket

3-8 Samsung Electronics

Disassembly and Reassembly

3-13 HVPS Board

1. Before you remove the HVPS board, you should remove:

-All covers (see pages 3-1, 3-4)

2. Remove five screws from the HVPS board.

3. Unplug the connector from the HVPS board, then remove the board.

Note: When you reassemble the HVPS board, make

sure that the high voltage electrodes are placed correctly.

3-14 LSU

1. Before you remove the LSU, you should remove:

-All covers (see pages 3-1, 3-4)

2. Unplug two connectors, remove five screws, then take out the LSU.

HVPS board

High voltage electrodes

LSU

3-9Samsung Electronics

Disassembly and Reassembly

3-15 Fuser

1. Before you remove the fuser, you should remove:

-All covers (see pages 3-1, 3-4)

2. Remove one screw securing the wire cap at the left side of the frame, unlatch the cap, then remove the cap.

4. Unlatch the tabs using a proper tool.

5. Slide the fuser in the direction of arrow and take it out.

3. Remove four screws.

Wire cap

Unlatch these tabs.

3-10 Samsung Electronics

Disassembly and Reassembly

3-16 Upper Frame

1. Before you remove the upper frame, you should remove:

-All covers (see pages 3-1, 3-4)

-Gear bracket (see page 3-14)

-HVPS board (see page 3-16)

2. Remove six screws, then remove two screws securing the solenoid.

3. Unlatch the front end of the frame, then lift it up.

3-17 Pressure Roller

1. Before you remove the roller, you should remove:

-All covers (see pages 3-1, 3-4)

-All boards (see pages 3-3, 3-5, 3-6, 3-8)

-Upper frame (see page 3-10)

-Fuser (see page 3-9)

2. Remove the roller.

Solenoid

Samsung Electronics 3-11

Disassembly and Reassembly

3-18 Pickup Roller

1. Before you remove the pickup roller, you should remove:

-All covers (see pages 3-1, 3-4)

-All boards (see pages 3-3, 3-5, 3-6, 3-8)

-Upper frame (see page 3-9)

2. Remove one screw, pull the pick-up bushing slightly toward you, then rotate it clock-wise.

3. Remove the E-ring at the right end of the roller.

4. Remove a pin passing through a shaft to take out the pick-up roller, then push the roller shaft to the right. Lift the left side of the roller, then take it out.

3-19 Installing SIMM

1. Before you install SIMM, make sure that printer power is off, all cables are unpluged. The toner cartridge is also to be removed.

2. Turn the printer upside down, and remove all screws securing the shield cover, then remove the shield cover.

3-12 Samsung Electronics

Disassembly and Reassembly

5. Push it firmly until it snaps into place.

Make sure both metal clips on the connector are fastened and the two pins on the connector are pushed through the holes on the SIMM.

Note: When you disassemble the SIMM, push

out on the metal clips at each end of the connector and pull it toward you.

6. Reassemble the shield cover.

3. Locate the SIMM connector on the control board.

4. Hold the SIMM with the connection points and insert the SIMM all the way into the connector at 30oangle .

4. Troubleshooting

4-1 Abnormal Image Printing and Defective Roller

If abnormal image prints periodically, check the parts shown below.

Samsung Electronics 4-1

No Roller Abnormal image period Kind of abnormal image

1 OPC Drum 94.3mm White spot 2 Charge Roller 37.7mm Black spot 3 Supply Roller 40.0mm Horizontal density band 4 Develop Roller 46.1mm Horizontal density band 5 Transfer Roller 47.1mm Black side contamination/transfer fault 6 Heat Roller 56.1mm Black spot and fuser ghost 7 Pressure Roller 56.2mm Black side contamination

Check connection to computer or replace controller.

Take out the cartridge and prepare the tester for electronic connection.

Repair or replace the GND terminal.

Check the path between video controller, engine board and HVPS. Repair or replace the defective component or board.

The mirror in LSU might be misplaced so the light path to the OPC deviates ->Repair or replace LSU or remove any defective matters in the machine.

Self test

pattern prints?

No image?

Self testing

is possible via

DCU?

Is the OPC

terminal of machine

well-connected

to Frame?

Does the

video data line to

LSU transit to High/Low

when printing?

Re-test after replacing the conector or controller board.

A on

YES

4-2 Print Quality

4-2-1 No Image

4-2 Samsung Electronics

Troubleshooting

Transfer roller might be out of its location.

-> Locate the roller into its place.

This could occurrs when the power of LSU is low or the density is low due to the obstacles on the window

-> Replace LSU or clean the window.

Transfer

voltage OK? (on the

transfer roller

shaft)

Are the

connection terminal

and connection

correct?

Repair or replace terminal.

Sealing tape

is removed from the

cartridge?

Replace HVPS or repair defective component.

Is the connection

terminal OK?

Replace HVPS or repair defective component.

Repair or replace terminal.

Remove the tape.

Developing

(-300V) and supplying

(-500V) voltage

are OK?

Does the

counter indicate over

the toner's guarranty

life?

Replace the toner cartridge.

YES

4-3

Samsung Electronics

Troubleshooting

All black in

printing area?

Is transfer

voltage supplied

from HVPS?

Is the

Hsync/ signal received

in LSU?

Transfer part's contact is bad. -> Repair or replace toner cartridge.

Does the

video data line to LSU

transit to High/ Low when

printing?

Replace LSU.

Check the path among video controller, engine board, HVPS, LSU for the shortage or open. -> Repair or replace the boards.

Repair or replace HVPS.

Replace LSU.

YES

4-2-2 All Black

4-4 Samsung Electronics

Troubleshooting

White line

missing definitely?

Dirt of dust stuck onto the window of internal lens of LSU

-> Clean it or replace LSU.

Preventive obstacles through the path between OPC of developer and LSU prevent the path -> Remove the obstacles.

Check if the

printout is still has the

same problem even right after

passed through the

transfer roller.

Toner material might be stuck to blade in the developer inside and it prevents toner supply -> Replace the developer.

Check both if the toner cartridge's counter is over its guaranty and amount of the toner material.

-> Replace the toner cartridge.

The ribs in fuser or toner on the roller may invoke the image problem. -> Replace the fuser cover or the defective part.

The image is originally black or the black part is far close to the top.

-> Use the pattern which has the image below bigger than 10mm from the top.

YES

4-2-3 Vertical White Line (Band)

4-5Samsung Electronics

Troubleshooting

'Dark' selected

via RCP?

Change to

'Normal' and test.

Works

correctly with

-300V of Bias voltage?

Works

correctly after

replaced LSU?

Repair or replace the defective component.

The power of LSU is set high or internal problem.

-> Replace LSU or adjust volume.

Same at 'Normal'?

END

Toner over supply due to the adjustment fault of metering blade in developer.

-> Replace developer.

YES

4-2-4 Dark Image

4-6 Samsung Electronics

Troubleshooting

Recommended

paper used?

Transfer,

charge and developing

voltage are OK?

Operating/

storage atmosphere is

too high temperature

/humidity?

Solve the problem under the recommended condition (10-32 degree Centigrade).

Dirt or

dust around the

charge roller?

Clean the charge roller or replace step-up device /terminal after check.

Work OK?

Internal blade or suppying part of the developer is defective.

-> Replace the toner cartridge.

Check terminals or contacts and 'Guide-Deve Spring' are misplaced.

-> Repair or replace transfer roller etc.

Check if the LED of PTL in front of the transfer roller is on when it presses the top cover switch on purpose.

-> If not, replace PTL.

Print 20 to 30 pages using the recommended paper.

Same problem

occurs?

- Adjust voltage or replace HVPS.

- Repair or replace after checking the terminals' contacts.

END

Replace the toner cartridge.

NO NO

YES

4-2-5 Background

4-7Samsung Electronics

Troubleshooting

YES

Is it regular

interval of 94mm?

PTL lamp

works OK?

Transfer

voltage is set to

standard?

Is it regular

interval of 46mm?

Is it regular

interval of 47mm?

(as transfer roller

interval)

Developing

/suppying voltage

normal? (-300V/

-500V)

Check HVPS contacts and HVPS's selfoutput.

-> If failed, repair/replace HVPS.

Replace PTL assembly.

Irregularity of NIP between rollers in developer.

-> Replace developer.

- Repair or replace HVPS .

- Check and repair or replace the terminal contacts.

A specific part of the transfer roller has ruined or its resistance value is changed.

-> Replace transfer roller.

Transfer roller cannot force regularly due to the gears eccentricity of transfer roller.

-> Replace the defective component.

Bias voltage

is OK? (-300V)

Operating/storage

temperature is too low or

not recommended

paper used?

Adjust the Bias voltage or replace HVPS.

There may be a problem in toner layer control in toner cartridge.

-> Replace the developer.

Use the machine with recommended paper and at normal condition.

YES

4-2-6 Ghost

4-8 Samsung Electronics

Troubleshooting

Is it regular

interval of 38mm?

The problem occured since the obstacles stuck to charge roller.

-> Replace developer and C/R.

When taking

out the cartridge,

toner leaks?

Toner leaks and toner material dropped onto the paper. -> Replace the developer.

Bad image

removes by

scratching?

Check toner is stuck onto the P/R or H/R in fuser.

-> Clean it or replace.

The problem randomly occured due to the toner fallen. -> Clean the machine.

NO NO NO

YES

4-2-7 Black Dot

Black band?

The black

band has regular

interval?

Black band

is far about 10mm from

white band?

Problem of internal contacts in OPC.

-> Replace developer.

The OPC is damaged under the direct sunlight for around 5 minutes. -> If the same problem persists in 10 hours, replace the developer.

This occurs when no Hsync/ at LSU.

-> Replace LSU.

94mm interval?

Heat roller is ruined.

-> Replace the roller.

The OPC is damaged due to the irregular transfer voltage of HVPS.

-> Repair/replace HVPS.

-> If the same problem persists, replace the developer.

Does it appear

at every 56.1mm at

specific place?

Problems of terminal contact, transfer voltage supplying, and transfer roller's due to the charge roller is ruined (38mm).

-> Repair/replace HVPS, developer.

NO NO

YES

4-2-8 Horizontal Band

+ 65 hidden pages