Brother DCP9040CN

One color is light

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	Dirt on exposure drum electrode	Are the electrodes of the drum unit and the appropriate color and machine body dirty?	Yes	Clean both electrodes.
2	Dirt on belt unit electrode	Are the electrodes of the belt unit and the appropriate color and machine body dirty?	Yes	Clean both electrodes.
3	Dirt on scanner windows	Is the scanner windows of the appropriate color dirty?	Yes	Wipe the dirt off with a soft, clean, lint free cloth.
4	Toner sensor failure	After replacing the toner cartridge of the appropriate color with a new one, does the same problem occur even after printing several pages?	No	Replace the toner cartridge of the appropriate color
5	Toner sensor failure	Does the machine start printing even after removing the toner cartridge of the appropriate color from the drum unit?	Yes	- Clean the toner sensor of the appropriate color. - Check the harness connection of the toner sensor PCB ASSY (TE/NEW) of the appropriate color. - Replace the toner sensor PCB ASSY (TE/NEW) of the appropriate color.

Faulty registration

Step	Cause	Check	Result	Remedy
1	Registration rear actuator operating smoothly or is it catching.	Does the registration rear actuator move smoothly?	No	Re-assemble the registration rear actuator.
2	Engine PCB failure	Is the problem solved after replacing the engine PCB ASSY?	Yes	Replace the engine PCB ASSY.