• Code: 66
• Description: Replace the toner cartridge (Y)
• Causes:
• Remedy:

• Code: 67
• Description: Replace the toner cartridge (K)
• Causes:
• Remedy:

• Code: 68
• Description: Fuser unit failure (The side thermistor detects higher temperature than the specified value.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 69
• Description: Fuser unit failure (The side thermistor detects lower temperature than the specified value.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 6A
• Description: Fuser unit failure (The side thermistor does not detect 60°C within the specified time.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 6B
• Description: Fuser unit failure (The center thermistor does not detect 100°C within the specified time.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 6C
• Description: Fuser unit failure (The center thermistor detects higher temperature than the specified value.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 6D
• Description: Fuser unit failure (The center thermistor detects lower temperature than the specified value.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Engine PCB failure.
• Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Low-voltage power supply PCB failure Replace the PS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.