Brother MFC9450CDN
Troubleshooting. Image Defect. Dark, Poor fixing
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. |
5 | Engine PCB failure | Is the problem solved after replacing the engine PCB ASSY? | Yes | Replace the engine PCB ASSY. |