Lexmark MS911 Service Manual page 601

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During feed, the elevator plate raises the paper until the paper comes into contact with the pick roller. The sensor

(elevator level) detects if the pick roller is sufficiently engaged with the paper. The motor (elevator) controls the

movement of the elevator plate.

As the amount of paper lessens, the elevator plate continues to move up. When the tray is almost empty, the sensors

(paper low 1 and 2) are unblocked. If the tray is full, then the sensor (paper low 1) is blocked and the sensor (paper low

2) is unblocked.

Sensor (tray empty)

Actuator position (with paper)

Actuator position (without paper)

Appendix C: Theory of operation