C7280 AIO produces dark spot when scanning

My C7280 produces a light to dark brown spot in the upper portion of the scan everytime I scan an item. It appears in the identical space everytime and I have cleaned the glass and reflection pad on the lid. I have tried other software and the result is the same.
There is simply no reason why this should be happening as far as I can tell.
Can someone please provide an idea of what is going on? From a scanning prospective, it is essentially useless for anything other than very basic scans where the spot isn't a big deal.
Thanks!

I had the exact same problem. Solved just by opening the scanner and cleaning the glass from the inside. Take a look at this page, that shows how to disassemble the scanner to get access to the glass. I've done this procedure in less than 10 minutes, and now it is perfect. Seems that the scanner sensor sometimes get too hot (maybe when you use it for a long period, non-stop), which kind of "burns" the plastic material around that area; then that plastic smoke kind of sticks in the glass (reallt hard to see this dirty from the outside) and causes this problem. Just clean with a tissue with a little bit of alcool.
How to disassemble and clean HP C7280 Scanner Glass Mirror
http://www.naddalim.com/forum/viewtopic.php?f=7&t=1854

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