Others Problems; The Machine Is Not Turned On, Or The Lcd Indication Does Not Appear - Brother HL-3040CN Service Manual

7.

OTHERS PROBLEMS

7.1 The Machine is Not Turned ON, or The LCD Indication
Does Not Appear.
Step
1 Harness
connection failure
of panel PCB
ASSY
2 Harness
connection failure
of LCD
3 LCD failure
4 Low-voltage power
supply PCB failure
5 Panel PCB failure
6 HVPS control PCB
failure
7 High-voltage power
supply PCB failure
8 Main PCB failure
Note:
When the error code 36 occurs, the power is forcibly turned OFF, and the machine cannot
be turned ON for 10 minutes.
Cause
Is the harness of the
panel PCB ASSY
connected correctly?
Is the harness of the
LCD connected
correctly?
Is the problem solved
after replacing the
LCD?
Is the problem solved
after replacing the
low-voltage power
supply PCB ASSY?
Is the problem solved
after replacing the panel
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 main
PCB ASSY?
Check
Result
No
No
Yes
Yes
Yes
Yes
Yes
Yes
3-83
Remedy
Reconnect the panel
PCB ASSY harness.
Reconnect the LCD
harness.
Replace the LCD.
Replace the low-voltage
power supply PCB
ASSY.
Replace the panel PCB
ASSY.
Replace the HVPS
control PCB ASSY.
Replace the
high-voltage power
supply PCB ASSY.
Replace the main PCB
ASSY.
Confidential