Troubleshooting Of The Control Panel Cover Assy; Nothing Is Displayed On The Lcd - Brother DCP-9010CN Service Manual

8. TROUBLESHOOTING OF THE CONTROL
PANEL COVER ASSY
8.1

Nothing is Displayed on the LCD.

<User Check>
- Verify if the power switch is turned off.
Step
1 Connection
between main PCB
and panel PCB
2 Connection
between main
PCB and
low-voltage power
supply PCB ASSY
3 LCD
4 Panel PCB
5 High-voltage power
supply PCB ASSY
6 Low-voltage Power
Supply PCB ASSY
7 Main PCB
Cause
Are the main PCB and
panel PCB connected
properly?
Are the main PCB and
low-voltage power
supply PCB ASSY
connected properly?
Is the problem solved
after replacing the
LCD?
Is the problem solved
after replacing the panel
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
No
Yes
Yes
Yes
Yes
Yes
3-94
Remedy
Reconnect the
connector properly.
Reconnect the
connector properly.
Replace the LCD.
Replace the panel PCB
ASSY.
Replace the high-
voltage power supply
PCB ASSY.
Replace the low-voltage
power supply PCB
ASSY.
Replace the main PCB
ASSY.
Confidential