Causes: The temperature inside the machine is too high. Both ends of the heat roller are at different temperatures. The paper media is replaced with different Paper size media.
Remedy: • After having passed for a while with having turned the power supply on.
Code: 76
Description: Fuser unit failure (The center thermistor detects rapidly rising temperature.)
Causes:
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 unit failure Fuser error code failure (The error history of the fuser unit is deleted.)
Causes:
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:
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 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.