Compuprint 3056 - Manual (Page 47)

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3. Push the tabs of the tractor backward and loose the sprockets locks.
4. Slide the left sprocket to the left side, about 12mm (0.5 inch) to the left
margin of printer, and fasten the sprocket locks, then slide the right
sprocket in order to match the width of continuous paper.
5. Make sure the edge of continuous paper is straight and clean. Open the
sprocket cover, and fit the hole of continuous paper to the pin of tractor.