Brother International 8250P Service Manual - Page 166
Troubleshooting Procedures, Control panel related, Telephone related, 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: 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 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 (1) No phone call can be made. (2) Speed dialing or one-touch dialing will not work. (3) Speaker silent during on-hook dialing. (4) Dial does not switch between tone and pulse. (5) Telephone does not ring. l FPC key l Control panel PCB l NCU PCB l Main PCB Check: 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. 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. l Main PCB l Speaker l NCU PCB l Main PCB VI - 14