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