Canon FAX L290 Service Reference Manual - page 21
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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 (J1) and power supply unit (J202).
(3) Check the connection between the SCNT board (J8) and power supply unit (J201).
(4) Check the connection between the SCNT board (J4) and PCNT board.
(5) Check the power supply unit’s fuse (F101/F102).
(6) Replace the power supply unit.
• Abnormal display. (Applicable test mode: Operation panel test)
Nothing is displayed.
(1) Check the connection between the OPCNT board (J2) and SCNT board (J1).
(2) Check the connection between the LCD unit and OPCNT board (J5).
(3) Replace the LCD unit.
(4) Replace the OPCNT board.
(5) 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 OPCNT board (J2) and SCNT board (J1).
(3) Check the connection between the LCD unit and OPCNT board (J5).
(4) Replace the LCD unit.
(5) Replace the OPCNT board.
(6) Replace the SCNT board.
• The buttons do not work. (Applicable test mode: Operation panel test)
(1) If the test mode can be used, check for faulty buttons.
(2) Check the connection between the OPCNT board (J2) and SCNT board (J1).
(3) Check the connection between the Membren sheet and OPCNT board (J1).
(4) Replace the Membren sheet.
(5) Replace the OPCNT board.
(6) Replace the SCNT board.
• No sound from the speaker
(1) Check the connection of the speaker and SCNT board (J401).
(2) Replace the speaker.
(3) Replace the SCNT board.