Canon LASER CLASS 730i Service Manual page 123

LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
DWS sensor fails to operate properly.
(1) Check whether the actuator of DWS sensor is in correct position.
(2) Check the connection between the ADF sensor board (J1) and the SCNT board
(J805).
(3) Replace the ADF sensor board.
(4) Replace the SCNT board.
DFS sensor fails to operate properly.
(1) Check whether the actuator of DFS sensor is in correct position.
(2) Check the connection between the ADF sensor board (J1) and the SCNT board
(J805).
(3) Replace the ADF sensor board.
(4) Replace the SCNT board.
Cassette 1 paper sensor fails to operate properly.
(1) Check whether the actuator of recording paper sensor is in correct position.
(2) Check the connection between the recording paper sensor and the EPU board (J305).
(3) Check the connection between the ECU board (J901) and the EPU board (J401).
(4) Check the connection between the ECU board (J912) and the SCNT board (J35).
(5) Replace the Cassette 1 paper sensor.
(6) Replace the EPU board.
(7) Replace the ECU board.
(8) Replace the SCNT board.
Cassette 2 paper sensor fails to operate properly.
(1) Check whether the actuator of recording paper sensor is in correct position.
(2) Check the connection between the recording paper sensor and the 250 feeder board
(J2003).
(3) Check the connection between the ECU board (J902) and the 250 feeder board
(J2001).
(4) Check the connection between the ECU board (J912) and the SCNT board (J35).
(5) Replace the Cassette 2 paper sensor.
(6) Replace the 250 feeder board.
(7) Replace the ECU board.
(8) Replace the SCNT board.
Cassette 3 paper sensor fails to operate properly.
(1) Check whether the actuator of recording paper sensor is in correct position.
(2) Check the connection between the recording paper sensor and the 500 feeder board
(J2003).
(3) Check the connection between the ECU board (J902) and the 500 feeder board
(J2001).
(4) Check the connection between the ECU board (J912) and the SCNT board (J35).
(5) Replace the Cassette 3 paper sensor.
(6) Replace the 500 feeder board.
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