Theory Of Operation - Xerox Phaser 8400 Service Manual

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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.

Theory of Operation

Tension Spring

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