Brother FAX100 Service Manual page 70

Control panel related
Trouble
(1) LCD shows nothing.
(2) Control panel
inoperative.
Telephone related
Trouble
(1) No phone call can be
made.
(2) Speed dialing or one-
touch dialing will not
work.
• Check the main-panel harness between the main PCB and the
control panel.
• Check the interfaces between the main PCB, NCU PCB and
power supply PCB.
• Check the control panel PCB.
• Check the power supply PCB.
• Check the main PCB.
• Check the main-panel harness between the main PCB and the
control panel.
• Check the interfaces between the main PCB, NCU PCB, and
power supply PCB.
• Check the control panel PCB.
• Check the FPC key.
• Check the main PCB.
• Check the FPC key.
• Check the control panel PCB:
- Use the maintenance-mode function No. 13. (Refer to
Section 3.) If any defective keys are found, replace them.
• Check the NCU PCB.
• Check the main PCB.
• Check whether the ordinary dialing function (other than the
speed and one-touch dialing) works correctly or not.
- If yes, check the main PCB.
- If not, refer to item (1) above.
V – 18
Action to be taken
Action to be taken