Troubleshooting Of The Control Panel - Brother DCP-7030 Service Manual

10.

Troubleshooting of the control panel

■ Nothing is displayed on the LCD.
User Check
• Verify if the power switch is turned off.
Step
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
Cause
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?
Check Result
No
No
Yes
Yes
Yes
Yes
1-51
Remedy
Reconnect the connector
properly.
Reconnect the connector
properly.
Replace the LCD.
Replace the control panel
PCB.
Replace the LVPS PCB
unit.
Replace the main PCB
ASSY.
Confidential