Lexmark Optra C710 Service Manual page 39

5016-001
Detecting the paper
Paper in the casette is detected by the paper detect sensor. When
the paper is detected the sensor is turns off. If paper is not detected
the sensor remains off.
Detecting paper level
The amount of paper remaining in tray 1 is detected by the paper
detect sensor. When there is enough paper in tray 1 the sensor
remains off. When the level is too low, less than 50 sheets, the
sensor turns on and Load Paper tray 1 message displays.
General Information
1-15