Nothing Is Displayed On The Led; Control Panel Is Inoperable - Brother DCP-L5500D Service Manual

4.6.2 Nothing is displayed on the LED

<User Check>
• Turn the power switch OFF and then ON again.
Step
Connection failure of the key PCB
1
flat cable
2 Panel PCB failure
3 Key PCB failure
4 Main PCB failure

4.6.3 Control panel is inoperable

<User Check>
• Turn the power switch OFF and then ON again.
Step
Connection failure of the panel flat
1
cable
2 Panel PCB failure
3 Touch panel failure
Low-voltage power supply PCB
4
failure
5 Key PCB failure
6 Main PCB failure
Cause
Reconnect the key PCB flat cable.
Replace the panel PCB ASSY.
Replace the panel unit.
Replace the main PCB ASSY.
Cause
Reconnect the panel flat cable.
Replace the panel PCB ASSY.
Replace the touch panel ASSY.
Replace the low-voltage power supply PCB
ASSY.
Replace the panel unit.
Replace the main PCB ASSY.
2-110
Remedy
Remedy
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