Konica Minolta bizhub 20 Service Manual page 91

■ Error code 56
Cover is Open
Close the Fuser Cover which can be found behind the Back Cover up
the machine.
Back cover is open
<User Check>
• Close the back cover.
• Install the Duplex unit.
Step
Harness connection failure of relay
1
rear PCB ASSY.
2 Relay rear PCB ASSY failure
3 Main PCB failure
■ Error code 57
Jam Duplex
Pull out the Duplex Tray at the back of the machine and remove the
jammed paper.
Paper jam (Duplex tray)
Step
1 Duplex feed ASSY failure
2 Main PCB failure
3 Plate gear damaged
Cause
Cause
3-16
Remedy
Check the harness connection of the relay
rear PCB ASSY and reconnect it.
Replace the relay rear PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the Duplex feed ASSY.
Replace the main PCB ASSY.
Replace the main frame L unit.
Confidential