After the end of the transfer operation, 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 500 W heater (Halogen lamp), which heats the heat roller.
A thermister, which is in contact with the heater roller, regulates the heater roller at a predetermined temperature (about 185 °C for OKIFAX 5000 series). A safety
thermostat cuts off voltage supply to the heater by opening the thermostat in the event of abnormal rise in temperature.
The back-up roller is held under a pressure of 2.84 kg by the pressure spring at each side.
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(BPX) for any updates to this material. (http://bpx.okidata.com)