Service manual

1-27
Confidential
■ Dirt on the back of paper
■ Vertical streaks
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 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?
Ye s
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?
Ye s
Replace the drum unit.
3
Scratch and 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.