Brother DCP9040CN

Diameter of Rollers

Image defects which appear periodically may be caused by failure of a roller. Specify the cause referring to the diameters of the rollers or pitch which appears in the image as shown in the table below.

No.	Parts name	Diameter	The pitch which appears in the image
1	Develop roller	Ø 20.0 mm	37.4 mm
2	Exposure drum	Ø 24.0 mm	75.0 mm
3	Heat roller in the fuser unit	Ø 25.0 mm	78.5 mm
4	Pressure roller ASSY in the fuser unit	Ø 25.0 mm	78.5 mm

Light on the whole page

User Check

- Check the machine’s environment. High temperature and high humidity conditions can cause this problem.
- If the whole page is light, toner save mode may be on.
- Replace the toner cartridge or drum unit with a new one.
- Implement calibration from the control panel.

Step	Cause	Check	Result	Remedy
1	Transfer HVPS PCB failure	Is the transfer HVPS PCB ASSY connected correctly?	Yes	Replace the transfer HVPS PCB ASSY.
2	Engine PCB failure	Is the harness between the HVPS PCB and engine PCB connected correctly?	Yes	Replace the engine PCB ASSY.
3	Charge HVPS PCB failure	Is the harness of the HVPS PCB connected correctly?	Yes	Replace the charge HVPS PCB ASSY.
4	Laser unit failure	Is the problem solved after replacing the laser unit?	Yes	Replace the laser unit.