Rear Media Guide; Media Tray - Lexmark MX81x Service Manual

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Rear media guide

The rear media tray guide assembly can be adjusted to different media sizes by moving it to the front or rear and can
be locked in position. The rear guide should come into contact with the media and hold it in position.
Side media guide
The media tray assembly is designed so that it can adjust to the media width in the media feed direction by moving the
side guide to the left or right.

Media tray

Media feeder
The pick roller assembly which is part of the media feeder, is a mechanical unit supplying media from the media tray
to the paper path. The driving force from the media feeder drive motor, is transmitted to the two pick rollers to feed
media from the tray and is also used to lift the tray plate that is used to lift the media stack into contact with the pick
rollers.
Sensor (media size)
The sensor (media size) detects the size of media supplied from each media tray assembly. A system of four switches
is used to decode the media size, which is then sent to the controller board.
Sensor (pick roller position)
This sensor is used to determine if the lift plate in the paper tray is at the optimum position for media to properly pick.
As media is fed out, clearance will occur between the media and the pick rollers. When the specified amount of clearance
is determined by the sensor, the lift plate will be raised to position the media in the optimum position to be properly
picked.
Appendix C: Theory of operation
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