Oki OKIPAGE 12i Series, Service Handbook

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(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, midium heavy=190
°
C, heavy=195
°
C, transparency = 170
°
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.
Separation claw
Heater
Heater roller
Thermistor
Back-up roller
Pressure Spring