Drum Assembly - Xerox WorkCentre C2424DX Service Manual

Drum Assembly

The drum assembly and transfix system form the key portion of the printer where
imaging takes place. The drum assembly and transfix system are separate, but
interrelated. This section discusses the drum assembly. The next section goes into
more detail on the transfix system.
In operation, the image to be printed on paper is first "printed" on the rapidly rotating
drum. The paper preheater heats a sheet of paper or transparency film to prepare it for
the image transfer process. The heated paper is then passed between the drum (now
rotating much more slowly) and the transfix roller. Under the pressure between the
drum and the transfix roller, the image is transferred to the sheet of paper. An encoder
disk and sensor on the left end of the drum monitors the drum's speed and position.
Transfix Roller
Paper Preheater
Drum
Drum Heater
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The drum heater heats the surface of the drum to about 60 C (140 F) for imaging.
The drum heater does not rotate. The heater is inside the drum, and is controlled by
the drum heater relay board. The drum heater consists of two resistive heater coils that
operate in series for 220 V and in parallel for 110 V operation. The series/parallel
operation is controlled by the drum heater relay board. A temperature sensor in
contact with the drum surface monitors the drum temperature. The main board
interprets the sensor's signal and turns on the drum heater and drum fan to heat the
drum, or turns on the drum fan alone to cool the drum.
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