Brother DCP-9045CDN, Service Manual

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Confidential 1-45
4.2 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
4.3 Troubleshooting Image Defect
Image defect related problems are end user recoverable if following the User Check items. If
the same problem occurs, follow each procedure in the order of the number described in the
Step column in the tables below.
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.