Brother International MFC 4600 Service Manual - Page 153
Troubleshooting Procedures, [ 1 ] Control panel related, [ 2 ] Telephone related
UPC - 012502565185
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2.4 Troubleshooting Procedures [ 1 ] Control panel related Trouble (1) LCD shows nothing. (2) Control panel inoperative. [ 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. Check: Panel-main harness between the main PCB and the control panel PCB Control panel PCB Low-voltage power supply PCB Main PCB LCD Panel-main harness between the main PCB and the control panel PCB Control panel PCB FPC key Main PCB FPC key Control panel PCB NCU PCB Main PCB Check: 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. 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. Main PCB Speaker NCU PCB Main PCB VI - 14