Brother FAX-931 Fax Machine User Manual


 
VI - 13
2.4 Troubleshooting Procedures
[ 1 ] Control panel related
Trouble Check:
(1) LCD shows nothing. Panel-main harness between the main PCB and the control PCB
Interfaces between the main PCB, NCU PCB and power supply
PCB
LCD
Control panel PCB
Power supply PCB
Main PCB
(2) Control panel inoperative. Panel-main harness between the main PCB and the control PCB
Interfaces between the main PCB, NCU PCB and power supply
PCB
Control panel PCB
FPC key
Main PCB
[ 2 ] Telephone related
Trouble Check:
(1) No phone call can be made. FPC key
Control panel PCB by using the maintenance-mode function
code 13. If any defective keys are found, replace them. (Refer
to Chapter V, Section 3.7, "Operational Check of 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 (Pick up the handset and press the
numerical keys.)
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