Epson LQ-2550 User Manual page 44

Be sure that the printer is off line. If it is not, press the ON LINE
1.
button to set the printer off line. Then press the PAPER SELECT button
until the TRACTOR light comes on.
Release the sprocket lock levers and slide the left sprocket unit all the
2.
way to the left and lock it in place. Next, slide the right sprocket unit
to roughly match the width of your paper but do not lock it.
Paper Handling
2-7