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■ Dirt on the back of paper
■ Vertical streaks
■ Black vertical streaks in a light background
<User Check>
- This problem may disappear after printing approximately
10 pages of completely blank sheets.
Step Cause Check
Result
Remedy
1
Scratch and Dirt
on the fuser unit
Is the pressure roller
ASSY dirty? Is any other
area in the machine dirty?
Yes
Print approximate 10 pages.
No
Replace the fuser unit.
2
Scratch and Dirt
in the paper feed
system
Is the paper feed system
dirty? Yes
Wipe dirt off.
<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.
Step Cause Check
Result
Remedy
1
Scratch and Dirt
in the paper feed
system
Is the paper feed system
dirty? Yes
Wipe dirt off.
2
Scratch and Dirt
on the exposure
drum
Are there scratch and
dirt on the surface of the
exposure drum?
Yes
Replace the drum unit.
3
Scratch and Dirt
on the heat roller
Are there scratch and
dirt on the surface of the
heat roller?
Yes
Replace the fuser unit.
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.
<User Check>
- Clean the inside of the machine and the corona wire in the drum
unit.
- Replace the toner cartridge with a new one.
Step Cause Check
Result
Remedy
1
Drum unit failure
Is the problem solved after
replacing the drum unit?
Yes
Replace the drum unit.