I was having the same problem on my 7250. After several attempts using different methods recommended on this blog, i finally figured it out on my own. First you must have installed the software that came with your All In One. If you haven't then do so. Then open up the HP Printer Assistant. Click on Print, Scan & Fax. Then click on Scan a Document or Photo. That will take you to a window that will allow you to adjust the Scan Size. I found that Legal is not an option, so I chose Custom then set it to 8 1/2 x 14. Then click the Scan button at the bottom of that window. That will do it.
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