Brother MFC-9840CDW - Poor Fixing

Confidential
1-48
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.
5 Engine PCB
failure
Is the problem solved
after replacing the engine
PCB ASSY?
Yes Replace the engine PCB
ASSY.
Completely blank
User Check
- Replace the toner cartridge or drum unit with a new one.
Step Cause
Check Result Remedy
1 Developing bias
voltage
conduction failure
Are the electrodes on the
drum unit and machine
body dirty?
Yes Clean both electrodes.
2 Scanner harness
connection failure
Is the scanner harness
connected securely?
No Reconnect the scanner
harness.
3 Engine PCB
failure
Is the problem solved after
replacing the engine PCB
ASSY?
Yes Replace the engine PCB
ASSY.
4 Laser unit failure Is the problem solved after
replacing the Laser unit?
Yes Replace the laser unit.
5 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
6 Charge HVPS
PCB failure
Is the problem solved after
replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.