Lexmark C910 5055-01x Service Manual page 44

5055-01x
Size Detection Mechanism
The paper size can be switched between A4 and letter (11 inches)
by changing the side fence position.
The paper size sensor 2 detects the fixing screw 2 at the A4
position.
The paper size sensor 1 detects the fixing screw 1 at the letter
position. Tray up motion stops when the up sensor is OFF, not
shielded.
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Service Manual