Theory of Operation 2-17
A closed-loop servomotor drives the drum assembly. Through a single reduction belt
drive, the servomotor rotates the drum at a high speed for imaging and a constant low
speed for image transfer to paper. The Y-Axis uses an active tension system to allow
the pulley to float while the spring actively adjusts the tension.
Note
The drum rotates in different directions for each process.
â– Transfix CW
â– Maintenance CCW
â– Printing CCW
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Always keep your fingers away from the drum drive system; it
uses a closed-loop servo drive system, which is inherently
dangerous. Since the motor speeds up if it senses the drum drive
system slowing down, fingers caught in the drum belts and gears
can be severely injured.
s8500-020
Y-Axis Motor
Tension Spring
Fan
CW
CCW
Y-Axis
Encoder
Drum Temperature Sensor
Single Reduction Belt Drive
Pulley
Air Direction
8400
8500/8550
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