Troubleshooting Of The Control Panel - Brother DCP-8070D 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
Connection
between main
2
PCB and LVPS
PCB unit
LCD
3
Control panel
4 PCB
LVPS PCB unit
5
Main PCB
6
Check
Are the main PCB and
control panel PCB
connected properly?
Are the main PCB and
LVPS PCB unit
connected properly?
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 LVPS
PCB unit?
Is the problem solved
after replacing the main
PCB ASSY?
3-71
Result Remedy
Reconnect the connector
properly.
No
Reconnect the connector
properly.
No
Replace the LCD.
Yes
Replace the control panel
Yes PCB.
Replace the LVPS PCB
Yes unit.
Replace the main PCB
Yes ASSY.
Confidential