Canon LASER CLASS 730i Service Manual page 112

LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
E733 A fault occurred in the communication between the SCNT board/the
ECU board /TOP signal cannot be detected
Cause: No recording paper reaches the page top sensor within a specific period of
time after the pickup command has been issued.
Solutions:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
E805 Fan failure
Cause:
(1)
(2)
(3)
Solutions:
(1)
(2)
(3)
Check the Top of page sensor, the sensor cable and the EPU board
(J305) connections.
Check the EPU board (J401) and the ECU board (J901)
connections.
Check the ECU board (J912) and the SCNT board (J35)
connections.
Replace the Top of page sensor.
Replace the EPU board.
Replace the ECU board.
Replace the SCNT board.
Poor contact in the fan drive signal line connector
Defective fan motor
Defective ECU board
Reconnect the ECU board connector J905 correctly.
Disconnect the ECU board connector J905. Measure the voltage
between the ECU board connector J905-1 (/FANON) and J905-3
(GND) immediately after power-ON.
If the voltage changes from 0V to about 24V, replace the fan.
Replace the ECU board.
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