Use the scanner glass when scanning two-sided pages if your printer does not support duplex scanning or the ADF does not support the original document size.
When using the ADF, adjust the paper guide on the ADF to the width of the original document.
When using the scanner glass, close the scanner cover, if possible, to avoid dark edges on the scanned image.
Do not load postcards, photos, small items, transparencies, photo paper, or thin media (such as magazine clippings) into the ADF. Place these items on the scanner glass.
When the document to be scanned is in place with the settings you want, press 
to start scanning.