All One Color; Dirt On The Back Of Paper - Brother DCP-9055CDN Service Manual

■ All one color

<User Check>
- Replace the drum unit with a new one.
Memo
You can check this image defect with the function code 71.
(Refer to "1.4.24 Color test pattern (Function code 71)" in Chapter
Step
1 Corona wire failure
2 High-voltage power supply
PCB failure
3 Laser unit failure
4 Main PCB failure

■ Dirt on the back of paper

Step
1 Fuser unit dirty
2 Dirt in the paper feed system
3 High-voltage power supply
PCB failure
Cause
Clean the electrodes of the drum unit and
main body. (Refer to
Fig. 2-13
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
<User Check>
- Clean the belt unit.
- Replace the waste toner box with a new one.
- Replace the belt unit with a new one.
Cause
Print approximate 10 pages.
Replace the fuser unit.
Wipe dirt off.
Replace the high-voltage power supply PCB
ASSY.
2-116
5.)
Remedy
Fig. 2-10 (P2-62)
(P2-63))
Remedy
and
Confidential