Lexmark X443 User Manual page 23

OptraImage 514/524
For information about installing the ADF of your OptraImage 514/524 scan
unit, refer to the documentation that shipped with the scan unit.
OptraImage 715/725 and W810
1
Raise the ADF and secure it with the metal leg attached.
2
Extend the paper chute enough to accommodate the length of your
originals according to the paper guide settings on the chute.
3
Install the ADF output stacker. Hook the pins in the claws on the scan unit.
Claw
Pin
Pin
Claw
15