Toshiba E-STUDIO190F Service Manual page 190

6.3.5. Fuser Unit
A 600W Heat Lamp (Halogen Lamp) heats the surface of the teflon-coated Heat Roller to approximately
190°C (374°F), a Thermistor monitors the Heat Roller temperature, and the CPU controls the ON/OFF
timing of the lamp.
The Thermostat is mounted 2.5mm away from the Heat Roller. If the ambient temperature reaches 190°C
(374°F), the Thermostat is opened, and power is removed from the Heat Lamp. The surface of the
Thermostat is not as hot as that of the Heat Roller. When the Thermostat opens, the surface of the Heat
Roller may reach 210°C (410°F), and the system displays E4-01. If the Thermistor opens, the system
displays
E4-01. If by chance the Thermostat malfunctions a Thermal Fuse opens.
The Pressure Roller is kept in contact with the Heat Roller through 2 pressure springs, which apply a
pressure of approximately 0.36 kg/cm (3.56 N/cm). Drive is supplied from the Main Motor via Intermediate
Gears.
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