Oki MC760 Maintenance Manual page 26

Oki Data CONFIDENTIAL
(6) Fusing
When the paper passes through the heat roller and backup roller unit, heat and
pressure are applied to the toner image on the paper and the toner is fused onto
the paper.
The halogen lamps of 800W and 400W are built in heat roller. The backup roller
without built-in halogen lamp is heated by the heat transmission from the heat
roller. The fusing temperature is controlled by the temperature detected by the
thermistor that is not in contacting with the surface of the heat roller. On the
other hand, the temperature detected by the thermistor rubbing the surface
of backup roller is used for controlling the fusing temperature under specified
conditions. Furthermore, a thermostat is used to limit the temperature rise, if
the temperature rise of heat roller exceeds a set point, the thermostat would be
open and the voltage supply to the heater would be cut off. The backup roller
unit is pressed on the heat roller by the spring on both sides.
Paper feeding path
Backup roller
Fuser belt
45376001TH Rev.1
Thermostat
Thermistor
Heat roller
Paper
Pad
Thermistor
(7) Drum cleaning
The Unfused toner left on the OPC drum is cleaned up by the drum cleaning
blade, and all residual toner is collected in the waste toner area of the toner
cartridge.
Toner cartridge
Drum cleaning blade
- + - + - + - + - + - + - + - + - + - +
(8) Electricity removal
The electricity on the surface of the OPC drum is attenuated by irradiating the
light to the surface of the OPC drum after transfer.
Electricity-removing
light PCB
Electricity-removing
light
2. Operating instructions
Waste toner area
ID unit
-
-
-
- +
- +
Charging roller
OPC drum
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