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■ Dirt on the back of paper
Step
Cause
Scratch and Dirt
1
on the fuser unit
Scratch and Dirt
2
in the paper feed
system

■ Vertical streaks

Step
Cause
Scratch and Dirt
1
in the paper feed
system
Scratch and Dirt
2
on the exposure
drum
Scratch and Dirt
3
on the heat roller
CAUTION :
• If the machine prints the same pattern, especially including vertical streaks,
continuously, black vertical streaks may appear on the paper since the electrostatic
performance of the exposure drum is decreased temporally.
■ Black vertical streaks in a light background
Step
Cause
Drum unit failure
1
<User Check>
- This problem may disappear after printing approximately
10 pages of completely blank sheets.
Check
Is the pressure roller
ASSY dirty? Is any other
area in the machine dirty?
Is the paper feed system
dirty?
<User Check>
- This problem may occur with noise which is caused by dirt
on the corona wire in the drum unit. In this case, clean the
corona wire with the wire cleaner.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Check
Is the paper feed system
dirty?
Are there scratch and
dirt on the surface of the
exposure drum?
Are there scratch and
dirt on the surface of the
heat roller?
<User Check>
- Clean the inside of the machine and the corona wire in the drum
unit.
- Replace the toner cartridge with a new one.
Check
Is the problem solved after
replacing the drum unit?
3-38
Result
Remedy
Yes
Print approximate 10 pages.
Replace the fuser unit.
No
Wipe dirt off.
Yes
Result
Remedy
Wipe dirt off.
Yes
Replace the drum unit.
Yes
Replace the fuser unit.
Yes
Result
Remedy
Replace the drum unit.
Yes
Confidential

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Troubleshooting

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