• Code: 56
• Description: Back cover is opened
• Causes: Harness connection failure of relay rear PCB ASSY. Relay rear PCB ASSY failure. Main PCB failure
• 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.

• Code: 57
• Description: Paper jam (Duplex tray)
• Causes: Duplex feed ASSY failure. Main PCB failure. Plate gear damaged
• Remedy: Replace the Duplex feed ASSY. Replace the main PCB ASSY. Replace the main frame L unit.

• Code: 58
• Description: Fuser unit failure
• Causes:
• Remedy:

• Code: 59
• Description: Fuser unit failure (Detect fuser failure at start-up)
• Causes: Fuser unit failure. Main PCB failure
• Remedy: Replace the fuser unit. Replace the main PCB ASSY.

• Code: 63
• Description: Toner life end
• Causes: Relay front PCB ASSY failure. Main PCB failure
• Remedy: Replace the relay front PCB ASSY. Replace the main PCB ASSY.

• Code: 67
• Description: Toner low
• Causes: Toner sensor PCB ASSY failure. Main PCB failure
• Remedy: Replace the toner sensor PCB ASSY. Replace the main PCB ASSY.

• Code: 68
• Description: Temperature rise when heater is off
• Causes: Fuser unit failure. Main PCB failure
• Remedy: Replace the fuser unit. Replace the main PCB ASSY.

• Code: 69
• Description: Mis-connect center thermistor connector
• Causes: Harness connection failure of fuser unit. Harness connection failure of relay rear PCB ASSY. Fuser unit failure. Main PCB failure
• Remedy: Check the harness connection of fuser unit and reconnect it. Check the harness connection of the relay rear PCB ASSY and reconnect it. Replace the fuser unit. Replace the main PCB ASSY.