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F during warming up and the heater is
turned on for 5 s.
The temperature won’t rise by 1 C/33.8
F during printing and the heater is
turned on for 5 seconds with the duty
cycle more than 60%.
Defective fuser
thermistor.
Follow the flow chart.
Broken thermal
cutout or heater
lamp.
Defective engine/
Comment