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Theory of Operation
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Fuser
The Fuser, using a combination of heat and pressure, bonds the toner to the paper. As
an FRU, the Fuser is replaced as a unit.
The Fuser receives its drive from the Motor Assembly. After the toner image is
applied to the paper, the paper passes through the Fuser. The Pressure Roller is
pressed against the Heat Roller to melt the toner and bond the image to the paper.
To better understand Fuser errors, Fuser components are described below.
Fuser Components
Component
Function
Heat Roller
The Heat Roller is a metal tube with a coated surface and a
Heater Assembly inside. As paper passes between the Heat
Roller and Pressure Roller, the heat fuses the toner to the paper.
Pressure Roller
The Pressure Roller is a metal shaft coated with sponge rubber.
It maintains pressure on the paper passing between it and the
Heat Roller. This pressure bonds the melted toner to the paper.
s5500-032
Main Heater Rod
Heater Rods
Pressure Roller
Heat Roller
Rear Thermistor
Center Thermistor
Thermostat
Pressure Roller
Thermistor
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