Epson LX-810 User Manual page 140

Cut Sheet Feeder
5. Insert the paper between the paper guides, aligning it with the
left edge of the guide. Then, adjust the right paper guide until
the paper is held firmly, but not so tightly that it causes the
paper to buckle. Make sure the paper can move freely up and
down.
6. Push the paper set levers back until they click into place and
clamp the paper against the guide rollers.
5-8 Using the Printer Options