Oki OKIOFFICE84 Maintenance Manual page 326

DESCRIPTION OF
PRINT OPERATIONS
(7) Fusing
The transferred unfused toner image is fused to a sheet of paper because heat and pressure are
applied when it passes between the heat roller and back-up roller.
The Teflon-coated heat roller contains a 400 W heater (Halogen lamp) that heats the heat roller.
The thermistor on the surface of the heat roller keeps the temperature of the heat roller constant.
A thermostat is also installed for safety. If temperature rises abnormally, this thermostat opens
to suspend voltage supply to the heater.
The back-up roller is pressurized to the heat roller by the pressure spring on each side.
(8) Cleaning
After transfer has terminated, the cleaning roller temporarily draws in the untransferred residual
toner adhering to the OPC drum with static electricity and then returns it to the OPC drum.
High-voltage
power supply
40672201TH Rev. 4
Thermistor
Separation claw
Pressure spring
Cleaning roller
B - 12
Heat roller
Heater
Back-up roller
OPC drum
Transfer roller