Fuser - Oki B930 Service Manual

Paper Path

Fuser

Heat Roll
The Heat Roll is a hollow metal tube with its surface coated. This tube is heated by the inner
Heater Rod. The heat is applied to the paper passing between the Heat Roll and Pressure
Roll, fusing and fixing the toner on the paper.
Pressure Roll
The Pressure Roll is a metal shaft coated with sponge rubber. Pressure is applied to the
paper between the Pressure Roll and Heat Roll, pressing the melted toner against the paper.
Heater Rod
The Heater Rod of the lamp comprises a quartz glass tube containing a heater coil. A termi-
nal is mounted to the end of the Heater Rod via a harness. Three Heater Rods are provided:
the Main Heater Rod to heat entire Heat Roll, and the Sub Heater Rods 1 and 2 to heat the
central portion of the Heat Roll.
Thermostat
If the Heat Roll temperature exceeds the preset temperature, the Thermostat cuts off the cir-
cuits of the Main Heater Rod and Sub Heater Rods 1 and 2.
600 dots/inch
SOS PWB
LD PWB
POLYGON MIRROR
ROS MOTOR
2-13
600 scans/inch