1-42 Service Manual
5055-01X
Fuser Unit
By applying heat and pressure, the image is melted and fused to the
paper.
The upper and lower rollers are heated and pressure-fitted. A heater
is positioned in the roller tube and a thermistor and thermostat
remain in contact with the outside of the tube. Separation fingers are
attached near the upper roller to separate the paper from the roller.
Each thermistor sends the surface temperature of the roller to the
printer controller. The printer controller turns the heater on or off
according to the voltage of each thermistor. If the controller fails and
the temperature of the roller exceeds specifications, the temperature
fuse (TCO) connected to each heater opens, preventing
overheating.
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