Canon LASER CLASS 730i, Service Manual

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LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
4-27
(4) Check the top of page sensor, the sensor cable and the EPU board
(J305) connections.
(5) Check the paper eject sensor, the sensor cable and the EPU board
(J301) connections.
(6) Check the main motor, main motor connector and the ECU board
(J903).
(7) Replace the multi-purpose tray paper sensor.
(8) Replace the cassette recording paper sensor.
(9) Replace the top of page sensor.
(10) Replace the paper eject sensor.
(11) Replace the main motor.
(12) Replace the EPU board.
(13) Replace the ECU board.
(14) Replace the SCNT board.
E004 Fixing unit failure
Cause:
(1) Shorted/broken wired main thermistor
(2) Shorted/broken wired sub thermistor
(3) Broken wired heater/blown thermal fuse
Solutions:
(1) Turn the power off and remove the fixing unit from the machine.
Measure the resistance between the fixing unit connector J301-1
(FSRTH) and J301-2 (GND).
If the resistance is not within the range between 350 W and 520 W
(room temperature of 20°C), replace the fixing film unit.
(2) Turn the power off and remove the fixing unit from the machine.
Measure the resistance between the fixing unit connector J302-1
(FSRTH2) and J302-2 (GND).
If the resistance is not within the range between 360 W and 530 W
(room temperature of 20°C), replace the fixing film unit.
(3) With the fixing film unit removed, if there is no continuity
between the fixing unit connectors J303-1 (ACN) and J303-3
(ACH), replace the fixing film unit.
(4) Replace the EPU board.
(5) Replace the ECU board.
If E004 is indicated, the RAM on the image processor will retain the error
memory of the fixing assembly after the power has been turned OFF an then
on. Execute the following in service mode, and turn OFF and then on the
power to clear the memory: #7 PRINTER>#4 PRINTER RESET>YES=(*).
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