●
Abnormal high temperature conditions
◦
The main thermistor temperature remains at 253°C (487°F) or higher for a specified period.
◦
The temperature of either one of the sub thermistors remains at 273°C (523°F) or higher for
a specified period.
●
Fuser heater drive circuit failure
◦
The specified count of the zero crossing signal is not detected within a specified period after
the product is turned on.
◦
The frequency is out of the specified range (40 to 70 Hz).
ENWW Engine control system 91
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