Epson TM-C7500 Series Technical Reference Manual page 52

9
Insert the paper along the paper guide (a). Align the end of the paper with
mark.
10
Move the paper guide (b) to align it with the paper width while pushing the
paper guide (b) lever. Paper jams or misprints may occur if the position of
the paper guide (b) is not aligned with the paper width.
Adjust the paper guide (b) in accordance with the paper width.
52
Mark
Paper Guide (a)
Lever
Paper Guide (b)