Epson LQ-300 User Manual page 52

7. Make sure your paper has a clean, straight leading edge.
Open the sprocket covers. Fit the first holes of the paper
over the sprocket pins and then close the sprocket covers.
Slide the right sprocket unit to remove any slack in the
paper and lock it in place.
8. To separate the incoming paper from the printed paper,
attach the paper guide. Hold it horizontally and fit its
notches over the printer's mounting posts. Then slide the
paper guide toward the back of the printer until you feel
it click.
9. Slide the left edge guide to the center until it stops at the
diamond-shaped guide mark; slide the right edge guide to
the opposite guide mark.
10. Attach the printer cover and adjust the paper position with
the knob. Turn the knob until the perforation between
pages is just above the print head.
11. Make sure the printer cover is closed. Then turn on the
printer. When the printer receives data, it begins printing
automatically.
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Using the Printer