Vertical Streaks - Brother DCP-9045CDN Service Manual

Dirt on the back of paper
Step Cause
1 Fuser unit dirty
2 Dirt in the paper
feed system
3 Belt unit dirty
4 Waste toner box
dirty

Vertical streaks

Step Cause
1 Dirt in the paper
feed system
2 Scratch on the
exposure drum
3 Exposure drum
dirty
4 Scratch on the
heat roller
Note:
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
- If there is dirt on the back of the paper in duplex printing, the
back of the paper tray may be dirty. Clean the back of the
paper tray.
Check
Is the pressure roller
ASSY dirty? Is any other
area in the machine dirty?
Is the paper tray or feed
system on the drum unit
dirty with toner?
Is the problem solved by
replacing the belt unit?
Is the problem solved by
replacing the waste toner
box?
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 tray or feed
system on the drum unit
dirty with toner?
Is there a scratch on the
surface of the exposure
drum?
Is there vertical dirt with
toner on the surface of the
exposure drum?
Is there a scratch on the
surface of the heat roller?
1-50
Remedy
Result
Yes Print approximate 10
pages.
No Replace the fuser unit.
Yes Wipe dirt off.
Yes Replace the belt unit.
Yes Replace the waste toner
box.
Remedy
Result
Yes Wipe dirt off.
Yes Replace the drum unit.
Yes Replace the drum unit.
Yes Replace the fuser unit
Confidential