Epson 5000 - Manual (Page 35)

3. Move the left edge guide until it locks in place next to the
guide mark. Then adjust the right edge guide to match the
width of your paper.
Caution:
Run the self test using paper at least 210 mm (8.2 inches)
wide; otherwise, the print head prints directly on the platen.
4. Insert a sheet of paper between the edge guides until it meets
resistance. After a few seconds, the printer loads the paper
to the loading position and begins printing the self test.
1-12 Setting Up the Printer