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 notifies the formatter of a failure
state when it encounters the following conditions:
●
Start-up failure
◦
If the main thermistor does not detect a specified temperature during the start-up process of
the heater in the wait period.
◦
If the main thermistor does not detect a specified temperature during the heater temperature
control in the initial rotation period.
●
Abnormal low temperature
◦
If the main thermistor detects an abnormal low temperature of the fuser unit during the printing
operation.
◦
If the sub thermistor detects an abnormal low temperature of the fuser unit during the printing
operation.
●
Abnormal high temperature
◦
If the main thermistor detects an abnormal high temperature of the fuser unit.
◦
If the sub thermistor detects an abnormal high temperature of the fuser unit.
●
Frequency detection circuit failure
◦
If a specified frequency of the ZERO CROSSING signal is not detected within a specified
period after the product is turned on.
ENWW Engine-control system 17
