Oki OKIPAGE 14EX Service Manual page 50

(6) Fusing
When the transfer is completed, the toner image is fused to the paper by heat and pressure as the paper with unfused toner image passes between the heater
roller and the back-up roller. The heater roller with Teflon coating incorporates a 400W heater (Halogen lamp), which generates heat.
A thermistor which is in contact with the heater roller regulates the temperature of the heater roller to a designated temperature in the menu, depending on the
thickness of the paper (tray 1&2: light=165°C, medium light=170°C, medium=175°C, medium heavy and heavy=195°C/manual feeding and power envelope
feeder: light=175°C, medium light=180°C, medium=185°C, medium heavy=190°C, heavy=195°C, transparency = 160°C). A safety thermostat cuts voltage supply
to the heater off by opening the thermostat in the event of abnormal temperature rises.
The back-up roller is held under a pressure of 3.76 kg applied by the pressure spring on each side.