2-62
Confidential
Error code 7800
The registration front sensor does not detect paper pass within the specified time after the
first side was printed in duplex printing mode.
<User Check>
• Remove the jammed paper.
• Close the back cover correctly.
• Attach the duplex tray correctly.
Step Cause Remedy
1
Foreign object in the rear of the
machine or duplex tray
Remove the foreign object.
2
Connection failure of the eject
motor harness
Reconnect the eject motor harness.
3 Duplex tray failure Replace the duplex tray.
4 Eject motor failure Replace the eject motor.
5
Damaged gears in the paper
feeding system
Replace the main frame L ASSY.
6 Paper eject roller failure Replace the paper eject roller.
7 Main PCB failure Replace the main PCB ASSY.
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