• Code: 56
• Description: Back cover is opened
• Causes: • Close the back cover. • Install the Duplex unit.
• Remedy: 1 Harness connection failure of relay rear PCB ASSY. Check the harness connection of the relay rear PCB ASSY and reconnect it. 2 Relay rear PCB ASSY failure Replace the relay rear PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.

• Code: 57
• Description: Paper jam (Duplex tray)
• Causes:
• Remedy: 1 Duplex feed ASSY failure Replace the X feed ASSY. 2 Main PCB failure Replace the main PCB ASSY. 3 Plate gear damaged Replace the main frame L unit.

• Code: 58
• Description: Fuser unit failure
• Causes:
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 59
• Description: Fuser unit failure (Detect fuser failure at start-up)
• Causes:
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 63
• Description: Toner life end
• Causes: • Replace the toner cartridge with a new one.
• Remedy: 1 Relay front PCB ASSY failure Replace the relay front PCB ASSY. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 67
• Description: Toner low
• Causes: • Prepare the toner cartridge with a new one.
• Remedy: 1 Toner sensor PCB ASSY failure Replace the toner sensor PCB ASSY. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 68
• Description: Temperature rise when heater is off
• Causes:
• Remedy: 1 Fuser unit failure Replace the fuser unit 2 Main PCB failure Replace the main PCB ASSY.

• Code: 69
• Description: Mis-connect center thermistor connector
• Causes:
• Remedy: 1 Harness connection failure of fuser unit. Check the harness connection of fuser unit and reconnect it. 2 Harness connection failure of relay rear PCB ASSY. Check the harness connection of the relay rear PCB ASSY and reconnect it. 3 Fuser unit failure Replace the fuser unit 4 Main PCB failure Replace the main PCB ASSY.