Code :

Code: 72
Description: BD beam detect sensor malfunction
Causes: Laser unit harness connection failure. Laser unit failure. Main PCB failure.
Remedy: 1 Laser unit harness connection failure Check the two harness connections of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Main PCB failure Replace the main PCB ASSY.

Code: 76
Description: Fuser unit failure (The center thermistor detects rapidly rising temperature.)
Causes: Fuser unit harness connection failure. Fuser unit failure.
Remedy: 1 Fuser unit harness connection failure Check the harness connection of the fuser unit and reconnect it. 2 Fuser unit failure Replace the fuser unit.

Code: 77
Description: Fuser error code failure (The error history of the fuser unit is deleted.)
Causes: Fuser unit failure. Main PCB failure.
Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Main PCB failure Replace the main PCB ASSY.

Code: 78
Description: Fuser unit failure (The temperature sensor of the fuser unit is broken.)
Causes: Fuser unit failure. Main PCB failure.
Remedy: 1 Fuser unit failure Replace the fuser unit. 2 Main PCB failure Replace the main PCB ASSY.

Code: 79
Description: No detection of the internal temperature thermistor.
Causes: Harness connection failure of internal temperature thermistor. Internal temperature thermistor failure. Main PCB failure
Remedy: 1 Harness connection failure of internal temperature thermistor Check the harness connection of the internal temperature thermistor, and reconnect it. 2 Internal temperature thermistor failure Replace the internal temperature thermistor. 3 Main PCB failure Replace the main PCB ASSY.

Code: 7A
Description: No detection of the main motor lock signal.
Causes: Main motor failure. Main PCB failure.
Remedy: 1 Main motor failure Replace the main motor ASSY. 2 Main PCB failure Replace the main PCB ASSY.

Code: 7D
Description: Dirt on drum unit
Causes: Dirt or dust on drum unit electrodes. HVPS PCB failure. Main PCB failure.
Remedy: 1 Dirt or dust on drum unit electrodes Clean the electrodes on the drum unit. ( p.271 "Electrodes location on the drum unit") 2 HVPS PCB failure Replace the HVPS PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.

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