Troubleshooting Of The Control Panel - Brother DCP-8085DN Service Manual

9. TROUBLESHOOTING OF THE CONTROL
PANEL
■ Nothing is displayed on the LCD.
<User Check>
- Verify if the power switch is turned off.
Step Possible cause
Connection
between main
1
PCB and control
panel PCB
Harness
between main
2
PCB and control
panel PCB
Connection
between main
3
PCB and PS
PCB unit
Harness
between main
4
PCB and PS
PCB unit
LCD
5
Control panel
6 PCB
PS PCB unit
7
Main PCB
8
Check
Are the main PCB and
control panel PCB
connected properly?
Is the harness
damaged?
Are the main PCB and
PS PCB unit connected
properly?
Is the harness
damaged?
Is the problem solved
after replacing the LCD?
Is the problem solved
after replacing the
control panel PCB?
Is the problem solved
after replacing the PS
PCB unit?
Is the problem solved
after replacing the main
PCB ASSY?
3-67
Result Remedy
Reconnect the connector
properly.
No
Replace the harness with a
normal one.
Yes
Reconnect the connector
properly.
No
Replace the harness with a
normal one.
Yes
Replace the LCD.
Yes
Replace the control panel
Yes PCB.
Replace the PS PCB unit.
Yes
Replace the main PCB
Yes ASSY.
Confidential