Canon LASER CLASS 730i Service Manual page 114

LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
The Reverse motor does not run.
(1) Check the connection between the reverse motor and the ECU board (J904).
(2) Replace the Reverse motor.
(3) Replace the ECU board.
(4) Replace the SCNT board.
The paper is not picked up from the multi-purpose tray.
(1) Check whether the recommended paper is used.
(2) Check whether more than 100 sheets of paper have been loaded in the multi-purpose
tray.
(3) Check whether the paper has been loaded into the multi-purpose tray correctly.
(4) Check the connection between the paper pickup solenoid and the ECU board.
(5) Replace the paper pickup solenoid.
(6) Clean the separation pad.
(7) Replace the separation pad.
(8) Replace the SCNT board.
The paper is not picked up from the cassette.
(1) Check whether the recommended paper is used.
(2) Check whether more than 250 sheets of paper have been loaded in the cassette.
(3) Check whether the paper has been loaded into the cassette correctly.
(4) Check the connection between the paper pickup solenoid and the ECU board.
(5) Replace the paper pickup solenoid.
(6) Clean the separation pad.
(7) Replace the separation pad.
(8) Replace the SCNT board.
The paper is not picked up from the Duplex feed unit.
(1) Check whether the curled paper.
(2) Check whether dust or paper debris have built up inside the duplex feed unit.
(3) Clean the duplex feed unit.
(4) Check whether the rollers, are damaged or scratched.
(5) Check whether the actuator of Duplex pickup paper sensor is in correct position.
(6) Check the connection between the Duplex solenoid and the ECU board (J909).
(7) Check the connection between the ECU board (J901) and the EPU board (J401).
(8) Check the connection between the ECU board (J912) and the SCNT board (J35).
(9) Disconnect the duplex solenoid connector J909. Measure the resistance between
the cable side connectors J909-1 and J909-2. If the resistance is 150Ω, replace the
duplex solenoid.
(10) Replace the ECU board.
(11) Replace the EPU board.
(12) Replace the SCNT board.
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