Samsung SCX 6220 Troubleshootin

Troubleshooting

Service Manual

7-1

Samsung Electronics

7. Troubleshooting

7.1 Scanner

7.1.1 COPY

White copy • Check the Scan-Cover open. • Room light can transit a thin original.

• Check shading profile. • Remake shading profile in the tech mode.

Black copy • Check the CCD problem in Main PBA. • Check the CCD harness contact.

• Check shading profile. • Remake shading profile in the tech mode.

Defective image quality • Check shading profile. • Remake shading profile in the tech mode.

• Check the gap between original and scanner. • The gap above 0.5mm can cause a glass blurred image.

• Check printing quality. • See “Print” troubleshooting.

Abnormal noise • Check the Scanner Motor and any mechanical • Check the right position of the Scanner

disturbance. Motor, and check the any mechanical dis

turbance in the CCD carriaging part.

• Check the Motor Driver in Driver PBA. • If any driver is defective, replace it.

PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE

Service Manual

Troubleshooting

7-2

Samsung Electronics

7.1.2 PC-Scan

Scanning Error • Check the printer cable installed. • Check correct installation, and use standard

IEEE1284 cable.

• Check how TWAIN driver is installed. • Remove any other scanner driver.

• Reboot after reinstallation of the TWAIN driver.

• Check the printer port(Parallel). • Check the parallel-port-related items in the CMOS Setup. As a printer port, Select ECP among SPP(Normal), ECP, and EPP modes(increase print-ing speed)

• Check harness contact. • Check CN12 contact in Main PBA

• Check the IEEE1284 signal level. • If any signal level is defective, replace Driver PBA.

Main PBA = 0.8V to 2.4V TTLsignal.

• Otherwise, replace Main PBA.

• Check the USB signal level. • If USB signal level is defective, replace Main PBA.

Defective image • Check shading profile. • Remake shading profile in the tech mode. Quality • Check the gap between original and scanner glass. • The gap above 0.5mm can cause a

blurred image.

Abnormal noise • Check the Scanner Motor and any mechanical • Check the right position of the Scanner

disturbance. Motor, and check the any mechanical

disturbance in the CCD carriaging part.

• Check the motor driver in Driver PBA. • If any driver is defective, replace it.

PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE

Troubleshooting

Service Manual

7-3

Samsung Electronics

7.2 FAX (only SCX-6320F)

7.2.1 FAX/TELEPHONE Precautions

TEL LINE CANNOT BE ENGAGED (NO DIAL TONE)

Cannot MF dial MF dial is possible but

not DP dial. Defective fax

transmission

Defective automatic fax reception

• When you press “ OHD” key: a) Check line cord connection.

b) Check MAIN LIU harness, and CN1

(LIU PBA).

• Check MAIN-LIU harness.

• Check DP control signal of MAIN PBA and Liu PBA.

• Check MAIN LIU harness.

• Is the external phone hooked off?

• Check ‘hook off’ : Refer to ‘TEL LINE CANNOT BE ENGAGED’ above.

• Check transmission path and reception path of the LIU PBA.

• Is the ring checked?

• Refer to ‘Defective Transmission.’

a) insert it correctly into the connection jack

called “line”.

b) Replace defective parts.

• Replace defective parts.

• Replace LIU PBA.

• Replace defective parts.

• Replace LIU PBA if low.

• Refer to ‘TEL LINE CANNOT BE ENGAGED’ above.

• Replace main PBA, if abnormal.

• Replace LIU PBA. Replace main PBA.

• Replace LIU PBA if it cannot be checked.

• Refer to ‘Defective Transmission’.

PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE

Service Manual

Troubleshooting

7-4

Samsung Electronics

7.3 Print Quality

Vertical black line and band

1. Bad blade of Toner cartridge

2. LSU

3. Bad cleaning blade of drum cartridge.

1. Change Toner cartridge

2. Replace LSU

3. Replace drum cartridge.

Error Status Check Solution

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Vertical white line 1. LSU window contamination

2. Toner cartridge

1. Clean LSU window

2. If not LSU, change Toner cartridge.

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No image 1. GND OPC is well grounded?

2. LSU running well?

3. Biss voltage is normal?

4. Lower toner?

5. Is there video data from Main PBA

1. Measure the resistance between frame ground and the ground spring attached frame. Confirm stable ground. Unless bad ground, detach cabinet, check where is bad point

2.Adjust LSU or replace it

3. Normal Dev bias = -450V

4. Shake toner cartridge and print.If a like good, toner is empty

5. Test engine test pattern , replace Main PBA

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Light image 1. LSU light power normal?

2. Enough toner?

3. High charger voltage?

4. Lower bias voltage

5. Contamination of high voltage contact.

6. Transfer volatge and roller.

1. LSU light power check is difficult.

Compare with new one and check.

2. Check toner and the toner cartridge counter

3~4. Measure all high voltage output.

5. Leakage toner cause bad contact and

increase contact resistance. Clean contaminated area.

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Troubleshooting

Service Manual

7-5

Samsung Electronics

Dark image 1. LSU light power normal?

2. Bias voltage output is high?

3. Video data is always supplied?

4. Bad high charge voltage contact.

1. Check the rated level and replace.

2. Set to power rating.

3. Replace defected board.

4. Check the charge voltage or change the drum cartridge.

Error Status Check Solution

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Background 1. High voltage output is normal?

2. C/R of drum cartridge is contaminated?

1. Adjust to the rated status.

2. Replace drum cartridge.

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Ghost 1. High voltage output.

2. Pre-Transfer Lamp.

3. Bad high voltage contact.

1. Check every high voltage.

2. Check the turn-on PTL, LED crash.

3. Clean the inside machine or replace drum cartridge.

Digital Printer

Stains on back of paper

1. Contamination of transfer roller.

2. Stains of paper path.

3. Pressure roller’s contamination.

1. Clean the transfer roller with vacuum cleaner.

2. Clean the area of paper path with cloth or air cleaner.

3. Remove fuser and replace it.

Service Manual

Troubleshooting

7-6

Samsung Electronics

Poor Fusing 1. Use recommended paper?

2. Check fusing temperature.

3. The machine was under the low tempera ture for a long time?

1. Should use recommended paper.

2. Check engine controller board. If you have not thermometer, measure the thermistor voltage to CPU, If 2.3V±5% in printing CPU works well. Then, disassemble fuser and check the thermistor contact and thermistor.

3. Re-check after putting the machine in the warm place for certain period.

Error Status Check Solution

Partial blank image (not periodic)

1. Toner is low?

2. The toner cartridge is out of position?

1. Replace Toner cartridge.

2. Checkand adjust.

Partial blank image (periodic)

1. Develop roller scar or particle.

2. Scar or particle. (94.3 mm)

3. Transfer roller scar or particle. (56.6 mm)

1. Replace toner cartridge.

2. Replace drum cartridge.

3. Replace transfer roller.

Digital Printer

Different image density (left and right)

1. Charge roller’s pressure force unbalance

2. Dev. roller and OPC or Dev. roller and blade’s pressure force unbalance

3. Transfer roller’s pressure force unbalance of each side

1. Replace drum cartridge.

2. Replace toner cartridge and drum cartridge.

3. Check left and right spring of transfer roller and the spring pressing the toner cartridge inside the machine

Horizonral band 1. Unstable high voltage contact

2. Charge roller’s contamination

3. Contamination of heat roller

4. Malfunction of LSU

1. Clean each contact and check good contact

2. Clean charge roller

3. Replace fuser unit

4. Check Main PBA.

Troubleshooting

Service Manual

7-7

Samsung Electronics

Abnormal Image Printing and Defective Roller

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

1 OPC Drum 94.3 mm White spot. Black spot 2 Charge Roller 38.3 mm White spot. Black spot 3 Supply Roller 43.8 mm Horizontal dark band 4 Develope Roller 54.3 mm Horizontal dark band 5 Transfer Roller 56.6 mm Black side contamination/transfer fault 6 Heat Roller 83.6 mm Black spot, White spot 7 Pressure Roller 91.0 mm Black side contamination

NO Roller Abnormal image period Kind of abnormal image

Service Manual

Troubleshooting

7-8

Samsung Electronics

No Image

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 Main 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 ?

Is the OPC

terminal of machine

is well-connected

to Frame?

Does the

video data line to

LSU transit to High/Low

when printing?

Retest after replacing the connector or controller board

A on

YES

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Troubleshooting

Service Manual

7-9

Samsung Electronics

Transfer roller might be out of its location

-> Locate the roller into its place

This could occurs when he 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

Replace HVPS or repair defective component

Is the connection

terminal OK?

Replace HVPS or repair defective component

Repair or replace terminal

Developing

(-450V) and supplying

(-600V) voltage

are OK?

Does the

counter indicate over

the toner’s guaranty

life

Replace the toner cartridge

YES

Service Manual

Troubleshooting

7-10

Samsung Electronics

All Black

All black in

printing area?

Is charge

voltage supplied

from HVPS?

Is the

Hsync signal received

in LSU?

Charge part’s contact is bad -> Repair or replace the drum 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

Digital Printer Digital Printer

Troubleshooting

Service Manual

7-11

Samsung Electronics

Vertical White Line (Band)

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 toner cartridge 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 toner cartridge

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

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