Poor Fixing - Brother HL-4140CN Service Manual

■ Poor fixing

<User Check>
Memo
You can check this image defect with the function code 71.
(Refer to "1.4.17 Color test pattern (Function code 71)" in Chapter
Step
1 Fuser unit failure
2 Low-voltage power supply
PCB failure
3 High-voltage power supply
PCB failure
4 Engine PCB failure
5 Laser unit failure
6 Toner/New sensor PCB
failure
7 Main PCB failure
- Check if the scanner window of the laser unit is dirty.
(Refer to Fig. 2-12 (P2-95))
- Use the specified paper.
- Open and close the front cover and make print again.
- Adjust the color calibration from the control panel.
- Adjust the auto registration from the control panel.
- Check the printer's environment. High temperature and high humidity or
low temperature and low humidity conditions can cause this problem.
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-98
5.)
Remedy
Replace the fuser unit.
Replace the low-voltage power supply PCB
ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the engine PCB ASSY.
Replace the laser unit.
Replace the Toner/New sensor PCB ASSY.
Replace the main PCB ASSY.
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