Brother International IntelliFax-3550 Service Manual - Page 147

Troubleshooting Procedures, Control panel PCB

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2.4 Troubleshooting Procedures [ 1 ] Control panel related Trouble (1) LCD shows nothing. (2) Control panel inoperative. Check: • Main-panel harness between the main PCB and the control panel PCB • Control panel PCB • Low-voltage power supply PCB • Main PCB • Main-panel harness between the main PCB and the control panel PCB • Control panel PCB • FPC key • Main PCB [ 2 ] Telephone related Trouble (1) No phone call can be made. (2) Speed dialing or one-touch dialing will not work. • FPC key • Control panel PCB • NCU PCB • Main PCB Check: • Ordinary dialing function (other than the speed and onetouch dialing) If it works normally, check the main PCB; if not, refer to item (1) above. (3) Speaker silent during on-hook dialing. • Ordinary dialing function (other than the on-hook dialing with the hook key) If it works normally, proceed to the following checks; if not, refer to item (1) above. (4) Dial does not switch between tone and pulse. • Main PCB (5) Telephone does not ring. • Speaker • NCU PCB • Main PCB VI - 13

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VI –
13
2.4
Troubleshooting Procedures
[ 1 ]
Control panel related
Trouble
Check:
Trouble
Check:
(1)
LCD shows nothing.
•
Main-panel harness between the main PCB and the
control panel PCB
•
Control panel PCB
•
Low-voltage power supply PCB
•
Main PCB
(2)
Control panel inoperative.
•
Main-panel harness between the main PCB and the
control panel PCB
•
Control panel PCB
•
FPC key
•
Main PCB
(1)
No phone call can be made.
•
FPC key
•
Control panel PCB
•
NCU PCB
•
Main PCB
(2)
Speed dialing or one-touch
dialing will not work.
•
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.
(3)
Speaker silent during on-hook
dialing.
•
Ordinary dialing function (other than the on-hook dialing
with the hook key)
If it works normally, proceed to the following checks; if
not, refer to item (1) above.
(4)
Dial does not switch between
tone and pulse.
(5)
Telephone does not ring.
•
Main PCB
•
Speaker
•
NCU PCB
•
Main PCB
[ 2 ]
Telephone related