Lexmark W820 Service Manual page 38

29.
30.
1-20
Service Manual
Registration Sensor
Monitors paper travel out of the paper tray.
No Paper Sensor 1
Monitors the paper level in Feeder 1. When the Lift Motor raises the Bottom Plate,
the Plate raises the paper stack, the stack pushes the No Paper Actuator up and
away from the No Paper Sensor. The Sensor sends a paper present signal to the
MCU PWB. When the last sheet of paper is fed out of the Paper Tray, the No Paper
Actuator drops through a cutout in the Bottom Plate. The Actuator then blocks the
Sensor, and the Sensor sends a no paper signal to the I/O PWB - MCU PWB.
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