Panasonic UF-9000 Service Manual page 174

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.
Ver. 1.0
174
UF-9000
DP-180/190
JAN 2004