• Code: 71
• Description: Laser unit polygon motor error.
• Causes: 1 Harness connection failure of laser unit. 2 Laser unit failure. 3 Engine PCB failure. 4 Main PCB failure
• Remedy: 1 Harness connection failure of laser unit Check the harness connections (at three locations) of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 72
• Description: Beam detecting sensor (Black/ Yellow) error of the laser unit.
• Causes: 1 Harness connection failure of laser unit. 2 Laser unit failure. 3 Engine PCB failure. 4 Main PCB failure
• Remedy: 1 Harness connection failure of laser unit Check the harness connections (at three locations) of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 73
• Description: Beam detecting sensor (Cyan/ Magenta) error of the laser unit.
• Causes: 1 Harness connection failure of laser unit. 2 Laser unit failure. 3 Engine PCB failure. 4 Main PCB failure
• Remedy: 1 Harness connection failure of laser unit Check the harness connections (at three locations) of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 74
• Description: The color toner reached the end of life during printing
• Causes: 1 Toner/New sensor PCB failure (Toner empty). 2 Engine PCB failure. 3 Main PCB failure.
• Remedy: 1 Toner/New sensor PCB failure (Toner empty) Check the sensor performance following the procedure described in “Function code 32”. If any problem occurs, replace the Toner/New sensor PCB ASSY. 2 Engine PCB failure Replace the engine PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.

• Code: 75
• Description: Cooling down the inside of the machine to protect it.
• Causes: 1 Internal temperature sensor failure. 2 Main PCB failure.
• 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 centerthermistor detects the sharp temperature rise.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Paper eject sensor PCB failure. 4 Main PCB failure.
• 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 centerthermistor detects the sharp temperature fall.)
• Causes: 1 Fuser unit failure. 2 Low-voltage power supply PCB failure. 3 Paper eject sensor PCB failure. 4 Main PCB failure.
• 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: 7A
• Description: Engine PCB error. (detection of PF drive motor lock error.)
• Causes: 1 Engine PCB failure. 2 Main PCB failure.
• Remedy: 1 Engine PCB failure Replace the engine PCB ASSY. 2 Main PCB failure Replace the main PCB ASSY.