HP Photosmart C410 document feeder says there is a jam everytime I use it (when the job is done)

Question

Hi all, I am on my second HP c410 (black, premium photosmart printer with an ADF, web, eprint, etc). I returned the first one because everytime I used the document feeder to scan or fax, at the end of my job, I would get an error saying paper jam in the feeder, reload, and try again.
My second C410 is doing this as well. I called support and their conclusion was to either send it to them or exchange. Is this a well known problem? Is it worth it to try to exchange it for a third one, or can you think of anything that would cause this. Support had me take apart the paper puller, check every nook and cranny (this was with the first one) and then go through some documentation on my own. I am figuring if my second one also does this, other people have to be experiencing it as well and maybe found a work-around????
I really like this printer and do not want to choose a different model  

Answer 1

I'm in the same situation. I've just received my second C410 printer with this fault in the document feeder (it continues to try to feed when all documents have been fed and eventually shows a feeder jam error). HP support asked me to try various resets without success, but I've located the problem.
Underneath the cover for the document feeder is a small plastic spring-loaded part which detects the presence of paper. On my machine, this gets stuck in the up (paper present) position when paper is fed and so the printer doesn't know when no paper remains in the feeder tray. I proved this to be the cause by gently forcing the paper detector down with a finger after the paper had fed. By doing this, the feeder works correctly. Looking at the affected part, this appears to be a design or manufacturing fault as the hinged paper detector rubs against the document feeder cover which causes it to become stuck.
I found this HP support page with a picture of the offending part on a similar model: http://bit.ly/cUh4dS (see the picture under the heading 'Solution three' near the bottom of the page).
Unfortunately, I've had to return both of these for a refund. It's a shame as otherwise it seems to be a well designed machine.