Ricoh Di-C1 Manual page 234

Temperature Control Components
Fusing
Belt
Heating
Roller
The following components control the temperature:
Heating roller: One thermistor and two thermostats
Pressure roller: Two thermistors and one thermostat
At the front of the fusing unit: Thermopile
Slide 234
The thermopile detects the temperature at the center of the fusing unit, and
the thermistor detects the temperature at the end.
Fusing
Roller
234
Di-C1 Training
Pressure
Roller