Canon MultiPASS C50 Service Manual page 144

Part 1: Facsimile
4.3 Errors not Shown on the Display
4.3.1 General errors
• The unit does not turn on. (Evaluation criteria: Look at the actual unit.)
(1) Check the power cord connection.
(2) Check the connection between the PCNT board (J4) and power supply unit.
(3) Check the connection between the SCNT board (JPCNT1, JPCNT2) and PCNT board (J5, J6)
(4) Check the power supply unit's fuse (F1).
(5) Replace the power supply unit.
• The display looks abnormal. (Applicable test mode: Operation panel test)
Nothing is displayed.
(1) Check the connection between the Operation panel unit and SCNT board (JOPCNT1).
(2) Replace the Operation panel unit.
(3) Replace the SCNT board.
Part of the LCD panel does not display anything.
(1) Check for LCD problems with the test mode.
(2) Check the connection between the Operation panel unit and SCNT board (JOPCNT1).
(3) Replace the Operation panel unit. (Faulty LCD)
(4) Replace the SCNT board.
• The keys do not work. (Applicable test mode: Operation panel test)
(1) If the test mode can be used, check for faulty keys.
(2) Check the connection between the Operation panel unit and SCNT board (JOPCNT1).
(3) Replace the Operation panel unit.
(4) Replace the SCNT board.
• No sound from the speaker
(1) Check the connection of the speaker and PCNT board (J10).
(2) Replace the speaker.
(3) Replace the PCNT board.
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