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■ Black horizontal stripes
Step
Cause
Dirt on the
1
charged
electrode
Paper tray
ground terminal
2
provided in the
machine body
Toner attached
on the develop
3
roller
Scratch and Dirt
on the exposure
4
drum
Scratch and Dirt
5
on the heat roller
HVPS PCB
6
failure
Main PCB failure Is the problem solved
7
Paper tray ground terminal.
<User Check>
- Clean the inside of the machine and the corona wire in the drum
unit.
- Replace the drum unit with a new one.
Check
Are the electrodes on
the drum unit and
machine body dirty?
Is the paper tray ground
terminal bent, which is
provided in the machine
body?
(Refer to
Fig.
Are the horizontal stripes
at 42.5 mm (develop
roller circumference)
intervals?
Are the horizontal stripes
at 94.2 mm (exposure
drum circumference)
intervals?
Are the horizontal stripes
at 78.5 mm (heat roller
circumference) intervals?
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
Bottom surface
of Paper tray
Fig. 3-7
3-39
Result
Clean both electrodes.
Yes
(Refer to
Correct bending of paper
tray ground terminal.
Yes
3-7.)
This problem will disappear by
printing approximate 10 pages.
Yes
If the same problem occurs,
replace the toner cartridge.
Replace the drum unit.
Yes
Replace the fuser unit.
Yes
Replace the HVPS PCB
Yes
ASSY.
Replace the main PCB
Yes
ASSY.
Remedy
Fig. 3-2, Fig.
3-3.)
Confidential

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Troubleshooting

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