Fusing Unit - Ricoh Aficio FX200 Service Training

Slide 54
5. Engine
More on the Fusing Unit
The temperature of the heat roller's surface is measured with a thermistor.
The AC power is controlled by comparing the target temperature to the value
from the thermistor.
An error shows if the value from the thermistor is out of the controlling range
during the fusing process.
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Fusing Unit

Mechanism
Fusing lamp
Hot roller
Pressure roller
Thermistor and thermostat.
Safety features
1st protection device: Hardware cuts off when the
machine overheats (>207°C).
2nd protection device: Software cuts off when the
machine overheats (>220°C).
3rd protection device: Thermostat cuts off mains
power to the fusing lamp (>160°C).
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