1-24 Service Manual
4022-XXX
Fuser
The fuser assembly contains a fusing component and a component for ejecting printed
paper from the printer. It also has a function that reverse-inserts paper to the duplex
assembly when the optional duplex assembly is attached to the printer.
Hot Roll - A metallic coating tube that is heated by the internal lamp to heat paper passing
between this roll and the backup roll. Using this heat, toner is fixed to the paper.
Backup Roll - A metallic shaft coated with rubber that applies pressure to paper between
this roll and the hot roll.
Temperature Sensor - A thermistor of which resistance changes as the temperature
changes. This sensor, in contact with the surface of the hot roll, monitors its temperature.
The surface temperature of the hot roll is held in the specified range by turning on and off
the power of the lamp using a signal sent from this sensor. This signal is also used to
prevent overheating.
Thermostat - Connected to the lamp in series, this unit prevents overheating. When
overheating of the fuser cannot be prevented via the temperature sensor, the thermostat
cuts off power to the lamp.
Front
Toner Low Sensor
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