Confidential
9-35
(I-7) Black and blurred horizontal stripes
User Check
(1) The drum unit may be damaged. Install a new drum unit.
(2) Check the paper used meets the recommended paper specifications.
(3) Clean the inside of the machine and the corona wire in the drum unit.
Possible cause
Step
Check
Result
Remedy
Ground
contacts
Scratch on the
drum
1 Are the horizontal stripes at
74mm (exposure drum)
intervals?
Yes The exposure drum was
scratched. Replace the
drum unit.
Toner stuck on
the developer
roller
2 Are the horizontal stripes at
42.7mm (developer roller)
intervals?
Yes
After printing several
pages, the problem will
disappear.
If not, replace the toner
cartridge.
Scratch on the
heat roller
3 Are the horizontal stripes at
79mm (heat roller)
intervals?
Yes Replace the heat roller.
Corona
contact failure
4 Are the charge electrodes
between the machine body
and the drum unit dirty?
Yes Clean both electrodes.
(3)
High-voltage
power supply
PCB failure
5 Is the problem solved after
replacing the high-voltage
power supply PCB?
Yes Replace the high-
voltage power supply
PCB.
(I-8) Black vertical streaks (in a gray background)
Possible cause
Step
Check
Result
Remedy
Ground
contacts
Corona failure 1 Is the corona wire dirty? Yes Clean the corona wire
with the wire cleaner.
(2)
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