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Adjustment and Troubleshooting
Service Manual
4-29
4) Black/White Spot
Description: 1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing
1. If dark or blurry black
spots occur periodically,
the rollers in the Developer may be
contaminated with foreign matte 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
transfer roller's life has expired.
Print several OPC cleaning Mode
Prints and then run the Self-test 2
or 3 times.
75.5 mm repetition: Examine the
surface of the OPC drum and
carefully clean with a soft, lint free
cloth. If unsuccessful replace the
cartridge.
37.7mm repetition: Replace the toner
cartridge
The transfer roller guarantees 60,000
sheets printing. If the roller's life is
expired, replace it.
Note. Cleaning the inside of the set to
remove excess toner particles or
paper dust will reduce the occurrence
of this problem.
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