Oki C821 Maintenance Manual

44015503TH Rev. 1
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Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
(6) Fusing
The toner image transferred on the paper is fused on the paper by heat and
pressure when the paper passes through the heat roller and backup roller.
Th
e heat roller is heated by 800W and 350W internal halogen lamps, and the
backup roller is heated by a 50W internal halogen lamp. The fuser temperature
is controlled according to the sum of the temperature that is not contacted with
the thermistor ground against the heat roller surface and the temperature that is
detected with the thermistor ground on the backup roller surface. There is also a
thermostat for safety purposes. When the heat roller temperature rises above a
certain temperature, the thermostat opens and shuts down the power supplied to
the heater. The backup roller unit is pressed against the heater with a press spring
on both sides.
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7) Drum cleaning
Unfixed toner remaining on the OPC drum is removed by the drum cleaning blade
and collected into the waste toner area of the toner cartridge.
Heat roller
Backup roller
Pat
Thermistor
Thermistor
Thermostat
Paper
Thermostat
Fuser belt
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ID unit
Space for waste toner
Toner cartridge
Drum cleaning blade
(8) Belt cleaning
Toner remaining on the transfer belt is scraped off by the belt cleaning blade and
collected into the waste toner box of the transfer belt unit.
Belt waste toner box
Transport belt
Belt cleaning blade

Oki C821 Specifications

General

Brand	Oki
Model	C821
Category	All in One Printer
Language	English