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Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-9
Theory of Operation
X-Axis or lateral movement of the Printhead is accomplished using a stepper
motor driving a fine-thread screw system. The Printhead, mounted to the X-
Axis shaft, moves laterally across the surface of the drum.
To find the Printhead home position, the X-Axis system drives the Printhead in
an open-loop. The Printhead is driven against the left printer frame for a few
seconds, and then reversed a set distance. A tension spring links to the
Printhead’s left shaft and provides a preloaded tension to allow the Printhead
to move smoothly.
s8500-014
Tension Spring
X-Axis
Shaft
X-Axis Hook
X-Axis
Shaft
X-Axis
Motor
Drum
Printhead
Nose
Cone
Gear