Brother HL-4150CDN - Pitch Indicated in Roller Image; Troubleshooting Image Defect

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3.5.2 Pitch indicated in roller image
Image defects which occur periodically may be caused by a failure of the roller. By referring to
the table below, specify the cause based on the pitch indicated in the image of each roller.
3.5.3 Troubleshooting image defect
Image defect related problems are 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
Fig. 2-12
No. Parts name The pitch which appears in the image
1 Developer roller 30 mm
2 Exposure drum 94 mm
3 Heat roller in the fuser unit 78.5 mm
4 Pressure roller in the fuser unit 78.5 mm
<User Check>
- Check the printer’s environment. High temperature and high humidity
or low temperature and low humidity conditions can cause this problem.
- If the whole page is light, toner save mode may be on. Turn off the
toner save mode.
- Wipe the scanner windows of the laser unit with a soft, lint-free cloth.
(Refer to the figure below.)
- Adjust the color calibration from the control panel.
- Adjust the color density from the control panel.
- Leave the printer for a while as the power remains ON.
- Replace the toner cartridge, drum unit or belt unit with a new one.
Step Cause Remedy
1 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
2 Engine PCB failure Replace the engine PCB ASSY.
3 Main PCB failure Replace the main PCB ASSY.
4 Laser unit failure Replace the laser unit.
5 Registration mark sensor
PCB failure
Replace the registration mark sensor holder
ASSY.