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2.4 Troubleshooting Procedures
[ 1 ] Control panel related
Trouble Check:
(1) LCD shows nothing. l Panel-main harness between the main PCB and the
control panel PCB
l Control panel PCB
l Low-voltage power supply PCB
l Main PCB
l LCD
(2) Control panel inoperative. l Panel-main harness between the main PCB and the
control panel PCB
l Control panel PCB
l FPC key
l Main PCB
[ 2 ] Telephone related
Trouble Check:
(1) No phone call can be made. l FPC key
l Control panel PCB
l NCU PCB
l Main PCB
(2) Speed dialing or one-touch
dialing will not work.
l 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.
l 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.
l Main PCB
(5) Telephone does not ring. l Speaker
l NCU PCB
l Main PCB