8 ] Control Panel; 9 ] Pcbs - Brother MFC640CW Service Manual

[ 8 ] Control panel

Defective component
Rubber keypad
Control panel PCB

[ 9 ] PCBs

Defective component
Main PCB
MJ PCB
Power supply PCB
- Keys will not work.
- The LCD will show nothing.
- Keys will not work.
- No faxes will be able to be sent.
- No phone calls will be able to be made.
- Copying will not be possible.
- PC-driven printing will not be possible.
- Scanning will not be possible.
- The machine will not be able to be turned on.
- Any of the following images may appear on the
printout of sent, copied, or scanned data:
- The telephone will not ring.
- No tone will be detected.
- The machine will not be able to switch to the
external telephone.
- No faxes will be able to be sent.
- No phone calls will be able to be made.
- The telephone will not ring.
- No tone will be detected.
- The machine will not be able to switch to the
external telephone.
- The machine will not be able to be turned on.
- The printed image will become lighter.
9 - 4 6
Result
Result
Error codes
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Error codes
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D *
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