Epson EPI-4000 User Manual page 52

Loading Paper to Print a Self Test
10. Move the paper support so it is centered between the paper
guides.
11. Take a stack of letter size paper, fan it, and then tap the edges
against a flat surface to even the stack.
CAUTION: The paper stack should be no higher than the
on the left paper guide to avoid
causing a paper jam.
Setting Up the Printer 1-35