Oki OKIPAGE 10e Service Manual page 42

(5) Transfer
The transfer roller is composed of conductive sponge material, and is designed to get the image drum surface and the
paper in a close contact.
Paper is placed over the image drum surface, and the positive charge, opposite in polarity to that of the toner, is applied
to the paper from the reverse side.
The application of a high positive voltage from the power supply to the transfer roller causes the positive charge
inducement on the transfer roller surface, transferring the charge to the paper as it contacts the transfer roller. The toner
with negative charge is attracted to the image drum surface, and it is transferred to the upper side of the paper due to
the positive charge on the reverse side of the paper.
(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, medium heavy=190°C, heavy=195°C, transparency = 160°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.