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I got a HP 7700 here that whenever I push the "Copy" button it tries to take the original from the Paper Feed tray instead of the scanner glass.

It used to work, but now it doesn't. Ideas?

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I'm going to assume you're dealing with an HP OfficeJet Pro L7700, and not a Photosmart 7700. :)

It sounds like your ADF (automatic document feeder) is malfunctioning in such that the printer always thinks there's paper in the ADF tray. Broken/dirty/stuck input paper sensor perhaps?

Things to try:

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