Epson LQ-860 User Manual page 145

3. Slide the left paper guide to where the fin on the edge guide
matches the arrow on the panel. Next, slide the right paper
guide so that it roughly matches the width of your paper.
4. Take a stack of paper and fan it as shown. This keeps the paper from
sticking and ensures that only one sheet feeds at a time. Tap the side
and bottom of the paper on a flat surface to even the stack.
Note: For best results, use typewriter quality paper. If you plan to
use paper with a glossy or textured surface, test it before using it
to print documents. Do not use multi-part forms, carbon paper, or
labels in the cut sheet feeder.
5-8 Using the Printer Options