How do I fix a Canon MP460 printer that feeds multiple sheets at a time, even for a one-page document, causing a paper jam?

Assumed you have cleaned out the feeding slot and sprockets that turn the feeder wheels. Often there's some piece of paper or gunk. One option that likely applies to most printers -- from another HP online source: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00190540&cc=us&dlc=en&lc=en

1. Look for paper that might have jammed inside the product. Use a flashlight to carefully view the areas around the rollers. Remove all traces of paper found.
2. Wipe the rubber paper-feed rollers with a lint-free cloth lightly moistened with distilled or bottled water. Rotate the rollers up carefully to clean all the way around.

1. Look for the paper pick roller farther inside the rear access area. The paper pick roller
   IMPORTANT : The paper pick roller is a bit more difficult to reach; however, it is the most important part to clean. Make sure to clean it thoroughly. If this roller is not clean, the issue will likely continue.
2. Clean the paper pick roller with a cotton swab moistened with distilled or bottled water. Apply a moderate amount of pressure to make sure that you remove all debris. Clean the roller thoroughly all the way around. Figure 8: Clean the paper pick roller
   [img border="0" src="http://h10025.www1.hp.com/ewfrf-JAVA/Doc/images/855/c01996641.gif" alt="Photo of cleaning the paper pick roller." title="Photo of cleaning the paper pick roller.">
3. Make sure that the rollers on the rear access door or duplexer are clean and in good condition. If any are missing, stuck, or loose, replace the rear access door or duplexer with a new one. Figure 9: Rear access door rollers
   [img border="0" src="http://h10025.www1.hp.com/ewfrf-JAVA/Doc/images/968/c01977887.gif" alt="Graphic of the rear access door and paper rollers" title="Graphic of the rear access door and paper rollers">
4. Allow the rollers to dry completely, and then replace the rear access door or duplexer. Slide the rear access door or duplexer into place, and then gently push it in until it clicks or snaps into place.