Troubleshooting Of The Control Panel - Brother DPC-8060 Service Manual

9.2.4.7 Troubleshooting of the control panel

(L-1) Nothing is displayed on the LCD.
User Check
(1) Verify if the power switch is turned off.
Possible cause
Connection
between main
PCB and control
panel PCB
Harness between
main PCB and
control panel
PCB
Connection
between main
PCB and low-
voltage power
supply PCB
Harness between
main PCB and
low-voltage
power supply
PCB LCD
LCD
Control panel
PCB
Low-voltage
power supply
PCB
Main PCB
Step Check
1 Main PCB and
control panel PCB
are properly
connected
2 Harness is damaged.
3 Main PCB and low-
voltage power supply
PCB are properly
connected.
4 Harness is damaged.
5 Replacement of LCD
solves the problem.
6 Replacement of
control panel PCB
solves the problem.
7 Replacement of low-
voltage power supply
PCB solves the
problem.
8 Replacement of main
PCB solves the
problem.
Result
No Fix the connector properly.
Yes Replace the harness with a normal
part.
No Fix the connection properly.
Yes Replace the harness with a normal
part.
Yes Replace the LCD with a normal
part.
Yes Replace the control panel PCB
with a normal part.
Yes Replace the low-voltage power
supply PCB with a normal part.
Yes Replace the main PCB with a
normal part.
9-56
Remedy
Confidential