Error code 5700
The registration front sensor does not detect paper pass within the specified time after the
first side was printed in duplex printing mode.
• Remove the paper jammed in the duplex paper feed system.
• Use A4 or Letter-size paper.
• Check that the thickness of the paper is 60 to 105 g/m
Foreign object in the duplex
paper feed system
Outer chute coming off
Connection failure of the duplex
Duplex gears attachment failure Reattach the duplex gears.
Duplex tray failure
Duplex solenoid failure
Damaged duplex gears
Main PCB failure
Remove the foreign object.
Reattach the outer chute.
Check the connection of the duplex solenoid
harness, and reconnect it if necessary.
Replace the duplex tray.
Replace the duplex solenoid.
Replace the main frame L ASSY.
Replace the main PCB ASSY.