Table 1-14 Fuser-control functions
Failure detection function Supported feature
Fuser temperature control Yes
Heat up error detection Yes
Low temperature error detection Yes
High temperature error detection Yes
Breaking of a heater wire detection No
Frequency detection circuit failure detection Yes
Low-voltage power supply failure detection Yes
Fuser pressure release mechanism failure detection Yes
Brand new fuser detection Yes
Fuser type discrepancy detection Yes
Fuser type identication detection Yes
Fuser presence detection Yes
Fuser life detection Yes
Fuser roller cleaning Yes
Fuser heater protection
Fuser heater protection is a feature that detects excessive temperatures in the fuser and interrupts the power
supply to the fuser heater.
The following three protective components prevent the fuser heater from excessive rising temperature:
●
DC controller: When a thermistor or sub-thermistor detects a temperature above a certain threshold,
the DC controller interrupts power to the fuser heater.
●
Fuser-heater safety circuit: The fuser heater safety circuit monitors the detected temperature of the
thermistors and interrupts power to the fuser heater when it detects excessive temperature.
●
Temperature fuse: When the fuser heater reaches a temperature above a certain threshold, the
temperature fuse interrupts power to the fuser heater.
18 Chapter 1 Theory of operation ENWW
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