Heat Belt (Belt Fuser); Pressure Roll; Thermistor; Sensor (Fuser Exit) - Lexmark MX81 series Service Manual

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Table of Contents

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.

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.

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.

The sensor (fuser exit) detects the arrival and departure of media as it passes through the fuser.

Appendix C: Theory of operation