Lexmark MX71 Series Repair Manual page 376

Sensor (finisher/stacker bin media present) removal
1
Remove the left cover. See
2
With a prying tool, open the LED sensor cover.
3
Release the latches holding the sensor (B) to the cover.
4
Disconnect the cable from the stapler controller board, then remove the sensor.
"Stapler/offset stacker left cover removal" on page
Repair information
746
726.
7463