Code :

Code: C6150
Description: Abnormally low fuser thermistor edge temperature Fuser thermistor 1 is detected 100C/ 212F less than 1 s continuously during copying.
Causes: Defective fuser heater M or S. Installation defectiveness on fuser thermistor 1. Defective PWB.
Remedy: Defective fuser heater M or S. Replace the fuser heater M or S. Installation defectiveness on fuser thermistor 1. Check the mounting state of the fuser 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: C6420
Description: Fuser unit fuse cut problem The fuse cannot be cut, When replacing the fuser unit, the fuse cannot be cut in 3 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 YC1 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: C7000
Description: Toner motor problem A motor over-current signal is detected continuously for 1 s or longer.
Causes: Poor contact in the connector terminals. Broken the gear. Defective toner feed motor. Defective engine PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC1 on the engine PWB and the connector on the toner feed motor, and the continuity across the connector terminals. Repair or replace if necessary. Broken the gear. Check visually and replace the gear if necessary. Defective toner feed motor. Run maintenance item U135 and check if the toner feed motor operates. If not, replace the toner feed motor. Defective engine PWB. Replace the engine PWB and check for correct operation.

Code: C7200
Description: Broken inner thermistor wire An abnormal value is detected in the input data to inner thermistor.
Causes: Poor contact in the connector terminals. Defective temperature sensor.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC32 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective temperature sensor. Replace the temperature sensor.

Code: C7300
Description: Toner hopper problem Toner emptiness is detected for 300 s, three times during the toner replenishment.
Causes: Poor contact in the connector terminals. Defective toner sensor.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC1 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective toner sensor. Replace the developing unit.

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.