Kyocera Ecosys P4040dn Operation Manual page 51

Paper Width
Guides
Paper Width
Adjusting Tab
Paper Length
Adjusting Tab
Paper Length Guide
4
Adjust the position of the paper width guides located on the left and
right sides of the cassette. Press the paper width adjusting tab and
slide the guides to the paper size required.
Note Paper sizes are marked on the cassette.
5
Adjust the paper length guide to the paper size required.
2-29
Preparation before Use