IBM LA75P - Manual (Page 17)

5 Take a stack of paper and fan it.
This keeps the paper from sticking, and prevents the sheet feeder from
feeding more than one sheet at a time.
6 Tap the side and bottom edges of the paper on a flat surface to even up the
stack.
Note: To avoid possible damage to the print head, ensure that your paper size
is not smaller than the print area. For best results, use typewriter-quality
paper. Refer to Appendix A for further information on paper specifications.
Loading Paper into the Sheet Feeder 2–3