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Confidential
■ Dirt on the back of paper
■ Vertical streaks
CAUTION:
If the machine prints the same pattern, especially vertical streaks, continuous, black vertical
streaks may appear on the paper as the electrostatic performance of the drum is decreased.
■ Black vertical streaks in a light background
Step Cause Check
Result
Remedy
1
Scratch or Dirt
on the fuser unit
Is the pressure roller
ASSY dirty?
Ye s
Print approximate 10
pages.
Is any other area in the
machine dirty?
No
Replace the fuser unit.
2
Scratch or 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 or Dirt in
the paper feed
system
Is the paper feed system
dirty? Yes
Wipe dirt off.
2
Scratch or Dirt
on the exposure
drum
Are there scratch and
dirt on the surface of the
exposure drum?
Ye s
Replace the drum unit.
3
Scratch or Dirt
on the heat roller
Are there scratch and
dirt on the surface of the
heat roller?
Ye s
Replace the fuser unit.
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?
Ye s
Replace the drum unit.
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