Brother HL-4150CDN - All One Color; Dirt on Back Side of Paper

2-100
Confidential
■ All one color
<User Check>
- Replace the drum unit with a new one.
■ Dirt on back side of paper
Memo
You can check this image defect with the function code 71.
(Refer to “1.4.17 Color test pattern (Function code 71)” in Chapter 5.)
Step Cause Remedy
1 Corona wire failure Clean the electrodes of the drum unit and
main body. (Refer to Fig. 2-6 (P2-52) and
Fig. 2-9 (P2-53))
2 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
3 Laser unit failure Replace the laser unit.
4 Main PCB failure Replace the main PCB ASSY.
<User Check>
- This symptom might stop occurring after making
several prints.
- Clean the belt unit.
- Replace the waste toner box with a new one.
- Replace the belt unit with a new one.
Step Cause Remedy
1 Dirt in the paper feed system Wipe dirt off.
2 Fuser unit dirty Replace the fuser unit.
3 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.