Code :

Code: C6050
Description: Abnormally low fuser unit thermistor temperature Fuser unit thermistor 1 is detected 80C/ 176F less than 1 s continuously during copying.
Causes: Defective fuser heater M or S. Installation defectiveness on fuser unit thermistor 1. Defective PWB.
Remedy: Defective fuser heater M or S. Replace the fuser heater M or S. Installation defectiveness on fuser unit thermistor 1. Check the mounting state of the fuser unit thermistor 1. If any problem is found, repair it. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

Code: C6400
Description: Zero-cross signal error While fuser heater ON/OFF control is performed, the zero-cross signal is not input within 3 s.
Causes: Defective PWB.
Remedy: Defective PWB. Replace the engine PWB or power source PWB and check for correct operation.

Code: C6410
Description: Fuser unit connector insertion problem Absence of the fuser unit is detected.
Causes: Fuser unit connector inserted incorrectly. Defective fuser unit connector.
Remedy: Fuser unit connector inserted incorrectly. Reinsert the fuser unit connector if necessary. Defective fuser unit connector. Replace the fuser unit.

Code: C6420
Description: Fuser unit fuse cut problem The fuse cannot be cut, When replacing the fuser unit, the fuse cannot be cut in 33 s after the fuse cut signal is turned on.
Causes: Poor contact in the connector terminals. Fuser unit connector inserted incorrectly.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC10 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Fuser unit connector inserted incorrectly. Reinsert the fuser unit connector if necessary.

Code: C7300
Description: Toner container problem Toner level is not detected when toner empty is detected.
Causes: Poor contact in the connector terminals. Defective toner container sensor.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC9 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective toner container sensor. Replace the toner container sensor.

Code: C7400
Description: Developing unit connector insertion problem Absence of the developing unit is detected.
Causes: Developing unit connector inserted incorrectly. Defective developing unit connector.
Remedy: Developing unit connector inserted incorrectly. Reinsert the developing unit connector if necessary. Defective developing unit connector. Replace the developing unit.

Code: C7410
Description: Drum unit connector insertion problem Absence of the drum unit is detected.
Causes: Drum unit connector inserted incorrectly. Defective drum unit connector.
Remedy: Drum unit connector inserted incorrectly. Reinsert the drum unit connector if necessary. Defective drum unit connector. Replace the drum unit.

Code: C7800
Description: Broken external thermistor wire The thermistor output value is 4.5 V or more.
Causes: Poor contact in the connector terminals. Defective humidity sensor.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC14 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective humidity sensor. Replace the humidity sensor.