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2.2.7.2. Fuser Unit Main 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
The drum-fuse belt conducts heat generated by the heater lamp to the 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. The Rigid assembly contacts with the nip inside fuser-belt. To check the proper width between the
fuser belt and the pressure roller, it is pressed on pressure roller by the spring.
3) Pressure roller
The pressure roller is a rubber roller which ensures proper nip width between the pressure roller and fuser belt. It is
controlled by the external drive mechanism.
4) NC sensor
NC sensor detects the surface temperature of the center and 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
2.2.7.3. Fuser Drive
The Drive Motor [A] drives the Pressure roller [B] through the gear train. The fuser belt [C] is driven by pressure with
the pressure roller.
Drive Motor [A]
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Fuser Belt [C]
Pr essure Roller [B]
2. Product Specifications and Description
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