#Part
1 Fuser unit assembly
2 Sensor (fuser output)
3 Sensor (narrow media)
4 Fuser solenoid
5 Pressure roll
6 Fuser lamp
Heat roll
The heat roll is a hollow metal tube with a coated surface. This tube is heated by the inner heater lamp. The
heat is applied to the media passing between the heat roll and pressure roll, fusing the toner on the media.
Pressure roll
The pressure roll is used to apply pressure to the media surface for fusing. Pressure is applied to the media
between the pressure roll and heat roll, pressing the melted toner against the media.
Heater lamp
The heater lamp is a quartz glass tube containing a heater coil. A terminal is mounted to the end of the heater
rod via a harness.
Thermal
cuto
If the heat roll temperature exceeds the preset temperature, the thermal cuto cuts o the circuits of the main
heater lamp and sub heater lamp.
4062
Appendix C: Theory of operation
532
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