IBM S544-5343-03 - Manual (Page 57)

3. Press down on the bottom plate of the paper tray until it snaps into position.
4. Important! If you are not changing paper size, go to Step 5 on page 38.
Otherwise, adjust the paper guides as follows:
a. Pull out on both sides while gently pushing up on the end guide. Do not push
the end guide up too far.
Chapter 3. Paper Handling 37