Epson 5000 - Manual (Page 51)

4. Slide the left sprocket unit to approximately 12 mm (½ inch)
from the far left position and push the sprocket lock lever
back to lock it in place. Then slide the right sprocket unit to
match the width of your paper, but do not lock it. Move the
paper support so it is midway between the sprocket units.
5. Make sure your paper has a clean, straight leading edge.
Then open the sprocket covers and fit the first four holes of
the paper over the sprocket pins.
Paper Handling 2-13