Epson 4500 - Manual (Page 39)

Testing the Printer
5. Adjust the right edge guide to match the width of your paper. Next,
slide a sheet of paper down between the edge guides until it meets
resistance.
WARNING:
Never run the self test using paper that is
narrower than 14 inches (legal paper turned sideways) to
prevent the print head from printing directly onto the platen.
6. Press the
LOAD/EJECT
button to load the paper.
Setting Up the Printer
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