Brother DCP-7030 Service Manual page 53

■ Dirt on the back of paper
Step Cause
Scratch or Dirt
on the fuser unit
1
Scratch or Dirt in
2 the paper feed
system
■ Vertical streaks
Step Cause
Scratch or Dirt in
1 the paper feed
system
Scratch or Dirt
2 on the exposure
drum
Scratch or Dirt
3 on the heat roller
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
Drum unit failure
1
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?
1-35
Result Remedy
Print approximate 10
Yes
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