• Code: 69
• Description: Fuser unit error. (The connectorof the center thermistor is inserted incorrectly.)
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: 6A
• Description: Fuser unit error. (The centerthermistor does not detect 60 °C within the specified time.)
• Causes: 1 Fuser unit connector connection failure. 2 Fuser unit failure. 3 Low-voltage power supply PCB failure. 4 Paper eject sensor PCB failure. 5 Main PCB failure
• Remedy: 1 Fuser unit connector connection failure Reconnect the connector of the fuser unit. 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: 6B
• Description: Fuser unit error. (The center thermistor does not detect 100 °C within the specified time.)
• Causes: 1 Fuser unit connector connection failure. 2 Fuser unit failure. 3 Low-voltage power supply PCB failure. 4 Paper eject sensor PCB failure. 5 Main PCB failure
• Remedy: 1 Fuser unit connector connection failure Reconnect the connector of the fuser unit. 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: 6C
• Description: Fuser unit error. (The center thermistor detects 270 °C or higher temperature for 1 second.)
• Causes: 1 Fuser unit connector connection failure. 2 Fuser unit failure. 3 Low-voltage power supply PCB failure. 4 Paper eject sensor PCB failure. 5 Main PCB failure
• Remedy: 1 Fuser unit connector connection failure Reconnect the connector of the fuser unit. 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: 6D
• Description: Fuser unit error. (The center thermistor detects 60 °C or lower temperature for 1 second during standby or printing.)
• Causes: 1 Fuser unit connector connection failure. 2 Fuser unit failure. 3 Low-voltage power supply PCB failure. 4 Paper eject sensor PCB failure. 5 Main PCB failure
• Remedy: 1 Fuser unit connector connection failure Reconnect the connector of the fuser unit. 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: 6E
• Description: Fuser unit error. (The center thermistor fails to detect the temperature rise even after the halogen heater is turned ON during printing and 15 second pass.)
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: 6F
• Description: Fuser unit error. (The center and side thermistors detect extremely high temperature.) (Detection of hardware.)
• Causes: 1 Fuser unit connector connection failure. 2 Fuser unit failure. 3 Low-voltage power supply PCB failure. 4 Paper eject sensor PCB failure. 5 Main PCB failure.
• Remedy: 1 Fuser unit connector connection failure Reconnect the connector of the fuser unit. 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: 70
• Description: Fuser develop motor error.
• Causes: 1 Harness connection failure of fuser develop motor. 2 Fuser develop motor failure. 3 Engine PCB failure. 4 Low-voltage power supply PCB failure. 5 Main PCB failure.
• Remedy: 1 Harness connection failure of fuser develop motor Check the harness connection of the fuser develop motor and reconnect it. 2 Fuser develop motor failure Replace the fuser develop motor. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Low-voltage power supply PCB failure Replace the low-voltage power supply PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY.