Ricoh GR-C1 Series Service Training page 175

Temperature Control Components
Fuse for New Fusing
Unit Detection
The machine uses the thermistors and thermostat to control the fusing
unit temperature.
The thermostat is also a safety switch to prevent overheating.
The thermopile is attached to the main body of the machine. It is not part
of the fusing unit.
The fuse for new fusing unit detection only exists in service parts. It does
not exist in the fusing unit that is built into the machine at the factory.
Slide 175
Why are there two pressure roller thermistors?
One of them is just outside the paper width of A4/LT, and the other is just inside.
They monitor the roller temperature within the paper feed area, and outside this
area (where the temperature will be higher).
Thermopile (for
the Fusing Belt)
Thermostat
Fusing Lamp
175
Thermistor (for
the Fusing Belt)
Pressure Roller
Thermistors
GR-C1 Training