Oki OKIPAGE 24DX Service Manual page 45

(7) Fusing
After the end of the transfer, the unfused toner image is fused on the paper under heat and pressure as it passes
between the heater roller and the back-up roller. The heater roller with a Teflon coating incorporates a 750W heater
(Halogen lamp), which heats the heat roller.
A thermistor which is in contact with the heater roller regulates the heater roller at a predetermined temperature
(about 180 ~ 200°C). A safety thermostat cuts off voltage supply to the heater by opening the thermostat in the event
of abnormal temperature rises.
The back-up roller is held under a pressure of 5 kg from the pressure spring at each side.