Canon MultiPASS C755 Service Manual - Page 81

Errors not Shown on the Display, 3.1 General errors, Nothing is displayed.

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MultiPASS C755 Chapter 3: Maintenance & Service 4.3 Errors not Shown on the Display 4.3.1 General errors • The unit does not power on. (1) Check the power cord connection. (2) Check the connection between the PCNT board (J204) and power supply unit. (3) Check the power supply unit's fuse (F1). (4) Replace the power supply unit. • The display looks abnormal. Nothing is displayed. (1) Check the connection between the Operation panel unit and SCNT board (JPANEL1). (2) Replace the Operation panel unit. (3) Replace the SCNT board. Part of the LCD panel does not display anything. (1) Check the connection between the Operation panel unit and SCNT board (JPANEL1). (2) Replace the Operation panel unit. (3) Replace the SCNT board. • The buttons do not work. (1) If the test mode can be used, check for faulty buttons. (2) Check the connection between the Operation panel unit and SCNT board (JPANEL1). (3) Replace the Operation panel unit. (4) Replace the SCNT board. • No sound from the speaker (1) Check the connection of the speaker and SCNT board (JSPK1). (2) Replace the speaker. (3) Replace the SCNT board. 3-30

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3-30
MultiPASS C755
Chapter 3: Maintenance & Service
4.3 Errors not Shown on the Display
4.3.1 General errors
• The unit does not power on.
(1) Check the power cord connection.
(2) Check the connection between the PCNT board (J204) and power supply unit.
(3) Check the power supply unit's fuse (F1).
(4) Replace the power supply unit.
• The display looks abnormal.
Nothing is displayed.
(1) Check the connection between the Operation panel unit and SCNT board (JPANEL1).
(2) Replace the Operation panel unit.
(3) Replace the SCNT board.
Part of the LCD panel does not display anything.
(1) Check the connection between the Operation panel unit and SCNT board (JPANEL1).
(2) Replace the Operation panel unit.
(3) Replace the SCNT board.
• The buttons do not work.
(1) If the test mode can be used, check for faulty buttons.
(2) Check the connection between the Operation panel unit and SCNT board (JPANEL1).
(3) Replace the Operation panel unit.
(4) Replace the SCNT board.
• No sound from the speaker
(1) Check the connection of the speaker and SCNT board (JSPK1).
(2) Replace the speaker.
(3) Replace the SCNT board.