Description: Fixing unit thermistor wire broken--The data generated by the fixing unit thermistor remains at F1H or above for longer than two minutes while fixing unit heaters M and S are on.
Code: C640
Description: Fixing unit thermistor wire shorted/abnormally high temperature detected--Data from the fixing unit thermistor remains at 45H or less for 160 ms or longer.
Code: C641
Description: Fixing unit thermistor abnormally low temperature detected--The signal from the fixing unit thermistor registers 100C or lower during standby or a copying cycle after secondary stabilization.
Code: C710
Description: Toner sensor problem--Data from the toner sensor remains at 14H or less, or F0H or above for 320 ms.
Code: C720
Description: Drum thermistor wire broken--The signal from the drum thermistor remains high for 5 s.
Code: C730
Description: Drum thermistor shorted/abnormally high temperature detected--The signal from the drum thermistor remains low for 5 s.
Code: C731
Description: Drum thermistor abnormally low temperature detected--The drum heater remains on at 100% output for 17 minutes with the safety switches on.
Code: C740
Description: Internal temperature thermistor broken--Data from the internal temperature thermistor remains at 0CH or less for 320 ms.