Brother HL-4570CDW - Page 139

2-108
Confidential
■ Inter-color position alignment
■ Fogging
<User Check>
- Implement the adjustment of inter-color position alignment from the
control panel.
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
Step Cause Remedy
1 Phase displacement of drum
gear
Align the drum phase.
(Refer to “6. IF YOU REPLACE THE DRUM
DRIVE MOTOR“ in Chapter 4.)
2 Registration mark sensor
PCB failure
Replace the registration mark sensor holder
ASSY.
3 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Do not use acid paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
- Check the printer’s environment. (If the printer is used in the high
humidity environment, this symptom is likely to occur.)
Step Cause Remedy
1 Toner/New sensor PCB
failure
Replace the Toner/New sensor PCB ASSY.
2 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
3 Engine PCB failure Replace the engine PCB ASSY.
Note:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.