Brother DCP9040CN

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.