2-66
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.
Fig. 2-8
<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
Twisted TT frame Loosen the nine screws shown in the figure
below and tighten them again.
3
Connection failure of the eject
motor harness
Reconnect the eject motor harness.
4 MX flapper attachment failure Reattach the MX flapper.
5 MX switching solenoid failure Replace the MX switching solenoid.
6 Duplex tray failure Replace the duplex tray.
7 Eject motor failure Replace the eject motor.
8
Damaged gears in the paper
feeding system
Replace the main frame L ASSY.
9 Paper eject roller failure Replace the paper eject roller.
10 Main PCB failure Replace the main PCB ASSY.
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