User's Manual

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Troubleshooting

Service Manual

7-11

7.3.3 Horizontal Black Band

• Description

1. Dark or blurry horizontal stripes occur in the printing periodically .

(They may not occur periodically.)

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause Solution

1. Bad contacts of the voltage terminals to

developer.

2. The rollers of developer may be stained.

Charge roller = 37.7 mm

Supply roller = 37 mm

Develop roller = 35.3 mm

Transfer roller = 45.3 mm

1. Clean each voltage terminal of the Charge,

Supply, Develop and Transfer roller.

(remove the toner particles and paper par -

ticles)

2. Clean the right Gear that has a relatively

small gap of the teeth in the OPC.

3. If the malfunction persists, replace the

developer.

7.3.4 Black/White Spot

• Description

1. Dark or blurry black spots occur periodically in the printing.

2. White spots occur periodically in the printing.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Check and Cause Solution

1. If dark or blurry black spots occur

periodically, the rollers in the Developer

may be contaminated with foreign matter

or paper particles.

( Charge roller : 37.7 mm interval

OPC drum : 75.5 mm interval)

2. If faded areas or voids occur in a black

image at intervals of 75.5 mm, or black

spots occur elsewhere, the OPC drum

surface is damaged.

3. If a black image is partially broken, the

transfer voltage is abnormal or the trans -

fer roller's life has expired.

1. Run OPC cleaning Mode Print and run the

Self-test 2 or 3 times.

2. In case of 75.5 mm interval unremovable in

1, cleanly remove foreign substances stuck

on the OPC location equivalent to black

spots and white spots with a dry duster .

3. The transfer roller guarantees 60,000

sheets printing. If the roller's life is expired,

replace it.

4. In case of 37.7 mm interval unremovable in

1, take measures as to replace the develop -

er cartridge and try to print out.

5. Clean the inside of the set against the paper

particles and foreign matter in order not to

cause the trouble.