Brother MFC-7450

1-51
Confidential
10. Troubleshooting of the control panel
■ Nothing is displayed on the LCD.
User Check
• Verify if the power switch is turned off.
Step Cause Check
Result Remedy
1
Connection
between main
PCB and control
panel PCB
Are the main PCB and
control panel PCB
connected properly?
No
Reconnect the connector
properly.
2
Connection
between main
PCB and LVPS
PCB unit
Are the main PCB and
LVPS PCB unit
connected properly?
No
Reconnect the connector
properly.
3
LCD Is the problem solved
after replacing the LCD?
Ye s
Replace the LCD.
4
Control panel
PCB
Is the problem solved
after replacing the
control panel PCB?
Ye s
Replace the control panel
PCB.
5
LVPS PCB unit Is the problem solved
after replacing the LVPS
PCB unit?
Ye s
Replace the LVPS PCB
unit.
6
Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.