Service manual

Symptoms, Causes, and Solutions of Bad Images
SM 4-5 M000/M009
Trouble-
shooting
4.2.4 BLACK/WHITE SPOT
Description:
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
Symptom and Cause Solution
1. If dark or blurry black spots occur
periodically, the rollers in the print
cartridge may be contaminated with
foreign matter or paper particles.
( Charge roller: 26.7 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 probably damaged.
3. If a black image is partially broken, the
transfer voltage is abnormal or the
transfer 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
irremovable 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 50.000
sheets printing in a normal
environment. If the roller's life is
expired, replace it.
4. In case of 75.5 mm interval
irremovable in 1, take measures as to
replace the print 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 problem.
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA