Check and Cause Solution
1. Bad contacts of the voltage terminals to
developer.
2. The rollers of developer may be stained.
Charge roller = 38.5mm
Supply roller = 51mm
Develop roller = 50mm
Transfer roller = 56.8mm
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 relatively
small gap of the teeth in the OPC.
3. If the malfunction persists, replace the
developer.
4.10.4 Black/White Spot
• Description
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
Check and Cause Solution
1. If dark or blurry black spots occur periodi-
cally, the rollers in the Developer may be
contaminated with foreign matte or paper
particles.
( Charge roller : 38.5 mm interval
OPC drum : 96 mm interval)
2. If faded areas or voids occur in a black
image at intervals of 96 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 96 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 125,000
sheets printing. If the roller's life is expired,
replace it.
4. In case of 38.5 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.
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