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Error code 8903
The back cover/duplex tray sensor detected that the cover was open when duplex printing is
started. (Before registering printing data to engine)
Error code 8904
The back cover/duplex tray sensor detected that the cover was open during duplex printing.
(After registering printing data to engine)
Error code 8A01
The registration rear sensor detected that the paper fed was smaller or larger than the
specified size in duplex printing mode.
<User Check>
• Close the back cover correctly.
• Attach the duplex tray correctly.
Step
Cause
Remedy
1
Back cover/duplex tray sensor
attachment failure
Reattach the back cover/duplex tray sensor.
2
Connection failure of the back
cover/duplex tray sensor
harness
Reconnect the back cover/duplex tray sensor
harness.
3
Damaged back cover
Replace the back cover.
4
Damaged duplex tray
Replace the duplex tray.
5
Main PCB failure
Replace the main PCB ASSY.
<User Check>
• Use specified paper.
Step
Cause
Remedy
1
Registration rear actuator
caught in some sections of the
machine
Reattach the registration rear actuator.
2
Registration rear sensor failure Replace the registration front/rear sensor PCB
ASSY.
3
High-voltage power supply PCB
failure
Replace the high-voltage power supply PCB
ASSY.
4
Main PCB failure
Replace the main PCB ASSY.