• Code: 6D
• Description: Fuser unit error. (The center thermistor detects 60°C or lower temperature for 1 second during standby or printing.)
• Causes:
• Remedy: 1 Fuser unit connector connection failure Check the connector connection of the fuser unit and reconnect it. 2 Fuser unit failure Replace the fuser unit. 3 Low voltage power supply PCB failure Replace the low voltage power supply PCB ASSY. 4 Paper eject sensor PCB failure Replace the paper eject sensor PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 6F
• Description: Fuser unit error. (The center and side thermistors detect extremely high temperature.) (Detection of hardware)
• Causes:
• Remedy: 1 Fuser unit connector connection failure Check the connector connection of the fuser unit and reconnect it. 2 Fuser unit failure Replace the fuser unit. 3 Low voltage power supply PCB failure Replace the low voltage power supply PCB ASSY. 4 Paper eject sensor PCB failure Replace the paper eject sensor PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 71
• Description: Laser unit error.
• Causes:
• Remedy: 1 Correction value error of laser unit Input the correction value of the laser unit correctly. 2 Harness connection failure of laser unit Check the harness connection of the laser unit and reconnect them. 3 Main PCB failure Replace the main PCB ASSY. 4 Laser unit failure Replace the laser unit.

• Code: 72
• Description: Beam detecting sensor error of the laser unit.
• Causes:
• Remedy: 1 Correction value error of laser unit Input the correction value of the laser unit correctly. 2 Harness connection failure of laser unit Check the harness connection of the laser unit and reconnect them. 3 Main PCB failure Replace the main PCB ASSY. 4 Laser unit failure Replace the laser unit.

• Code: 74
• Description: An unidentified error occurred.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: 75
• Description: Cooling down the inside of the machine to protect it.
• Causes: • Leave the machine for a while as the power remains ON.
• Remedy: 1 Internal temperature sensor failure Replace the internal temperature sensor. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 76
• Description: Fuser unit error. (The center thermistor detects the sharp temperature rise.)
• Causes:
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low voltage power supply PCB failure Replace the low voltage power supply PCB ASSY. 3 Paper eject sensor PCB failure Replace the paper eject sensor PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 78
• Description: Fuser unit error. (The center thermistor detects the sharp temperature fall.)
• Causes:
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low voltage power supply PCB failure Replace the low voltage power supply PCB ASSY. 3 Paper eject sensor PCB failure Replace the paper eject sensor PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.