Fuser Unit Components - Samsung SCX-82x0 series Service Manual

2. Product Description

2.6.2 Fuser unit components

The Fuser unit includes the following components:
1. Center heater lamp (LAMP1) / Side heater lamp (LAMP2)
These halogen lamps heat the drum-fuser belt. The center heater lamp (LAMP1) and the side heater
lamp (LAMP2) are lit alternately to heat the drum-fuser belt.
Each heater lamp has its coil in a different location. The coil of the center heater lamp (LAMP1) is in
the center, those of the side heater lamp (LAMP2) are on both sides. The heater lamps are fixed inside of
the drum-fuser belt so that they will not rotate separately.
2. Drum-fuser belt
It receives heat from halogen lamp inside and conducts heat to toner and paper. The thin fuser belt
reduces warming up time and mode changing time. To prevent the fuser belt from adhering to the toner,
the surface of the fuser belt is fluorinated. Rigid assembly located inside the fuser belt contacts inner
surface of the fuser belt at nip and is pressed on the pressure roller by springs in order to ensured proper
nip between fuser belt and pressure roller.
3. Pressure roller
The pressure roller is a rubber roller which ensures proper nip width between the pressure roller and
fuser belt. It is driven by external driving mechanism and drives fuser belt by pressure.
4. NC sensors
NC sensors detect the surface temperature of the center and the rear end of the fuser belt which controls
the heater lamps.
5. Thermostat
These thermostats cut off the power supply to the heater lamps by opening the circuit when the fuser belt
becomes abnormally hot as a result of problems such as a NC sensor malfunction.
These thermostats are used to prevent abnormal operation. When the thermostat is triggered, it must be
replaced (as well as the other damaged parts in the fuser unit).
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Service Manual SAMSUNG ELECTRONICS