HP multi units are notorious for scanner failures. It is just a weak component in their machines. I have seen this time and time again. The only solution is to change the scanner out or purchase a different machine. Just keep in mind the notoriety HP has which failed scanners. If you want to venture into the replacement of the scanner the following website might have the product you are looking for. Otherwise, search around the net for a scanner assembly unit for the OJ7310. But, be prepared scanner units are not cheap.
Check here first...
PrinterFixer.net
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