Brother HL-4040CN - Poor Fixing

Confidential
1-44
Dark
User Check
- Check the machine’s environment. High temperature and high humidity
conditions can cause this problem.
- Replace the toner cartridge or drum unit with a new one.
- Implement calibration from the control panel.
Step Cause
Check Result Remedy
1 Corona wire
conduction failure
Are the electrodes on the
drum unit and machine
body dirty?
Yes Clean both electrodes.
2 Dirt on belt unit
electrode
Are the electrodes on the
belt unit and machine
body dirty?
Yes Clean both electrodes.
3 Transfer HVPS
PCB failure
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
4 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
5 Engine PCB
failure
Is the harness connected
between the HVPS PCB
and engine PCB
correctly?
Yes Replace the engine PCB
ASSY.
Poor fixing
User Check
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Implement calibration from the control panel.
Step Cause
Check Result Remedy
1 Fuser unit failure Is the problem solved
after replacing the fuser
unit?
Yes Replace the fuser unit.
2 Low-voltage
power supply
PCB failure
Is the problem solved
after replacing the PS
PCB unit?
Yes Replace the PS PCB unit.
3 Transfer HVPS
PCB failure
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
4 Charge HVPS
PCB failure
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.