Brother DCP9040CN

Vertical streaks

User Check

- This problem may occur with noise which is caused by dirt on the corona wire in the drum unit. In this case, clean the corona wire with the wire cleaner.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.

Step	Cause	Check	Result	Remedy
1	Dirt in the paper feed system	Is the paper tray or feed system on the drum unit dirty with toner?	Yes	Wipe dirt off.
2	Scratch on the exposure drum	Is there a scratch on the surface of the exposure drum?	Yes	Replace the drum unit.
3	Exposure drum dirty	Is there vertical dirt with toner on the surface of the exposure drum?	Yes	Replace the drum unit.
4	Scratch on the heat roller	Is there a scratch on the surface of the heat roller?	Yes	Replace the fuser unit

Note:
If the machine prints the same pattern, especially including vertical streaks, continuously, black vertical streaks may appear on the paper since the electrostatic performance of the exposure drum is decreased temporally.

Vertical streaks in a light background

User Check

- Clean the inside of the machine and the corona wire in the drum unit.
- Replace the toner cartridge with a new one.

Step	Cause	Check	Result	Remedy
1	Drum unit failure	Is the problem solved after replacing the drum unit?	Yes	Replace the drum unit.