Dell 1135N Service Manual page 105

4) Black/White Spot
Description : 1. Dark or blurry spots occur periodically in the printing
2. White spots occur periodically in the printing
black spots occur periodically,
the rollers in the Developer may be conta-
minated with foreign material or paper particles.
(Charge roller : 26.7mm interval
occur in a black image at intervals
of 75.5 mm, or black spots occur elsewhere,
partially broken, the transfer voltage is
abnormal or the transfer roller's
Service Manual
Alignment and Troubleshooting
1. If dark or blurry
OPC drum : 75.5mm interval)
2. If faded areas or voids
the OPC drum surface is
damaged.
3. If a black image is
life has expired.
Print several OPC cleaning Mode
Prints and then run the Self-test
2 or 3 times.
In case of 75.5 mm interval
unremovable in 1, Clean foreign
substances stuck on the OPC location
equivalent to black spots and white
spots with a dry cotton cloth.
1. The transfer roller has expired
[50.000 sheets]. Replace it.
2. In case of 47 mm interval
unremovable in 1, take measures
as to replace the developer
cartridge and try to print out.
3. Clean the inside of the set against
the paper particles and foreign
matter in order not to cause the
trouble.
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