Drum/Transfix Assembly; Figure 5-2 The Drum And Its Systems - Tektronix Phaser 360 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 the 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
pre-heater
Drum heater
housing

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 about 49
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.
Tranfix roller
Drum
Drum heater
element
9923-14
Theory of Operation
o o
C (120 F) for imaging.
Service Manual 5-3
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