Poor Fixing - Brother HL-3040CN Service Manual

■ Poor fixing

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User Check
- Open and close the top cover and make print again.
- Adjust the color density from the control panel cover ASSY.
- Check the machine's environment. High temperature and high humidity
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Memo:
You can check this image defect with the function code 71.
(Refer to "1.4.14 Color test pattern (Function code 71)" in Chapter
Step Cause
1 Lifting of LED
ASSY
2 Fuser unit failure
3 Low-voltage power
supply PCB failure
4 HVPS control PCB
failure
5 High-voltage power
supply PCB failure
6 Engine PCB failure
7 Toner/new
sensor PCB failure
8 Main PCB failure
>
or low temperature and low humidity conditions can cause this problem.
Is printing of the LED
ASSY test pattern
correctly done in
"Function code
Is the problem solved
after replacing the fuser
unit?
Is the problem solved
after replacing the
low-voltage power
supply PCB ASSY?
Is the problem solved
after replacing the HVPS
control PCB ASSY?
Is the problem solved
after replacing the
high-voltage power
supply PCB ASSY?
Is the problem solved
after replacing the
engine PCB ASSY?
Is the problem solved
after replacing the
toner/new sensor PCB
ASSY?
Is the problem solved
after replacing the main
PCB?
3-61
Check
Result
No
68"?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
7.)
Remedy
Re-assemble the
LED ASSY.
Replace the fuser unit.
Replace the
low-voltage power
supply PCB ASSY.
Replace the HVPS
control PCB ASSY.
Replace the
high-voltage power
supply PCB ASSY.
Replace the engine
PCB ASSY.
Replace the toner/new
sensor PCB ASSY.
Replace the main PCB
ASSY.
Confidential