Drum/Transfix Assembly; Figure 5-2 The Drum And Its Systems - Tektronix Phaser 340 Service Manual

Drum/transfix assembly
The drum/transfix assembly forms the key portion of the printer where imaging
takes place. The main features of the drum/transfix assembly are its drum and
transfix roller. In operation, the image to be printed on paper is first "printed"
on the rapidly rotating drum. A sheet of 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. The paper pre-heater heats up the sheet of paper prior to image
transferring.
Paper
heater

Figure 5-2 The drum and its systems

An encoder wheel and sensor on the left end of the drum monitors the drum's
speed as well as its "home" position. Also necessary for printing is the drum
heater, which heats the surface of the drum to a constant 49
imaging. 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 to heat the drum, or turns on the drum fan to cool the drum.
Tranfix roller
Drum
heater
Theory of Operation
Drum
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Service Manual
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