Heat Belt (Belt Fuser); Pressure Roll; Thermistor - Lexmark MX81 Series Service Manual

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Heat belt (belt fuser)

The heat belt is a thin metal belt with a coated surface. This belt is heated by a ceramic heater bar. The heat is applied
to the media passing between the heat belt 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 (or heat belt) to aid in the fusing process.

Thermistor

The thermistor monitors the surface temperature of the media-feed portion of the heat belt or heat roll to provide
feedback to the controller board. This information is used to turn the ceramic heater or halogen lamp on and off to
maintain the desired temperature.
Appendix C: Theory of operation
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