Troubleshooting Based On Problem Type; 1 ] Control Panel Problems; 2 ] Telephone Problems - Brother MFC620CN Service Manual

9.2.4 Troubleshooting based on problem type

[ 1 ] Control panel problems
Problem
(1) LCD shows nothing.
(2) Control panel inoperative.
[ 2 ] Telephone problems
Problem
(1) No phone call can be made.
(2) Speed dialing will not work.
(3) Dial does not switch between
tone and pulse.
(4) Telephone does not ring.
• Panel-main harness
• Control panel PCB
• Power supply PCB
• Main PCB
• Panel-main harness
• Control panel PCB
• Rubber keypad
• Main PCB
• Rubber keypad
• Control panel PCB
• Main PCB
• MJ PCB
• Ordinary dialing function (other than the speed and one-touch
dialing)
If it works normally, check the main PCB; if not, refer to item
(1) above.
• Main PCB
• Speaker
• Main PCB
• MJ PCB
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Check:
Check:
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