The Fan Does Not Work - Brother HL-3040CN Service Manual

7.2

The Fan Does Not Work.

Step
1 Harness
connection failure
of the appropriate
fan
2 Failure of the
appropriate fan
3 Engine PCB failure
4 HVPS control PCB
failure
5 High-voltage power
supply PCB failure
6 Low-voltage power
supply PCB failure
7 Main PCB failure
Cause
Is the harness of the
appropriate fan
connected correctly?
Is the problem solved
after replacing the
appropriate fan?
Is the problem solved
after replacing the
engine 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
low-voltage power
supply PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Check
Result
No
Yes
Yes
Yes
Yes
Yes
Yes
3-84
Remedy
Reconnect the harness
of the appropriate fan
correctly.
Replace the appropriate
fan.
Replace the engine
PCB ASSY.
Replace the HVPS
control PCB ASSY.
Replace the
high-voltage power
supply PCB ASSY.
Replace the appropriate
fan.
Replace the low-voltage
power supply PCB
ASSY.
Replace the main PCB
ASSY.
Confidential