Fuser failure detection
The DC controller determines a fuser unit failure, deactivates the FUSER HEATER CONTROL signal, releases
the relay to interrupt power supply to the fuser heater, and then notifies the formatter of a failure state
when it encounters the following conditions:
●
Abnormal temperature rise: The sleeve thermistor does not rise at a specified temperature within a
specified period after the fuser heater control starts.
●
Abnormally low temperature: The thermistors are at a specified temperature or lower during a print
operation or other fuser heating cycle.
●
Abnormally high temperature: The thermistors are at a specified temperature or higher, regardless of
the fuser control status.
●
Drive circuit abnormality: The frequency in the zerocross circuit is out of a specified range when the
product is turned on or is in the standby period.
ENWW Engine-control system 17
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