Epson Stylus 1500 Reference Manual page 38

8. Position the left sprocket unit so its right edge is aligned
with the arrow mark on the printer. The arrow mark
indicates the left edge of the printable area. Then lower the
sprocket-lock lever to lock the left sprocket unit.
9. Slide the right sprocket unit to remove any slack in the
paper. Then lower the sprocket-lock lever into place.
Paper Handling
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