All Black; Dirt On The Back Of Paper - Brother DCP-1510 Service Manual

4.4.7 All black

Step
Dirt on electrodes of the drum unit
1 and those of the machine
Connection failure of the laser unit
2
flat cable
Laser unit FG plate attachment
3
failure (not grounded correctly)
High voltage power supply PCB
4
failure
5 Laser unit failure
6 Main PCB failure

4.4.8 Dirt on the back of paper

Step
1 Dirt on paper feed system
2 Dirt on the fuser unit
<User Check>
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
Cause
<User Check>
- This problem may disappear after printing multiple
sheets of paper.
- Replace the toner cartridge with a new one.
Cause
1-51
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 1-8.)
Reconnect the laser unit flat cable.
Check the contact of the laser unit FG plate,
and retighten the screws.
Replace the high voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Remedy
Wipe off the dirt.
Replace the fuser unit.
Fig. 1-7 or
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