Epson LQ-300 User Manual page 47

5. To separate the incoming paper from the printed paper,
attach the paper guide by holding it horizontally and fitting
its notches over the printer's mounting posts as shown
below. Then slide the paper guide toward the front of the
printer until you feel it click.
6. Slide the left edge guide to the center until it stops at the
diamond-shaped guide mark. Then slide the right edge
guide to the opposite guide mark.
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Using the Printer