Diameter Of Rollers; Troubleshooting Image Defect - Brother DCP-9045CDN Service Manual

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.
1 Develop roller
2 Exposure drum
3 Heat roller in the fuser unit
4 Pressure roller ASSY in the fuser unit
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
Step
1 Transfer HVPS
PCB failure
2 Engine PCB
failure
3 Charge HVPS
PCB failure
4 Laser unit failure
Parts name
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.
Cause
Is the transfer HVPS PCB
ASSY connected
correctly?
Is the harness between
the HVPS PCB and
engine PCB connected
correctly?
Is the harness of the
HVPS PCB connected
correctly?
Is the problem solved after
replacing the laser unit?
Diameter
Ø 20.0 mm
Ø 24.0 mm
Ø 25.0 mm
Ø 25.0 mm
Check
Result
Yes
Yes
Yes
Yes
1-45
The pitch which
appears in the image
37.4 mm
75.0 mm
78.5 mm
78.5 mm
Remedy
Replace the transfer
HVPS PCB ASSY.
Replace the engine PCB
ASSY.
Replace the charge
HVPS PCB ASSY.
Replace the laser unit.
Confidential