Ubuntu – Wifi connection to scanner not working


I have a Samsung NC10 running Ubuntu 12.04 with wifi connection to a Netgear DG834PN router with wifi connection to an Epson SX515W multi function printer. I also have a desktop machine running 12.04 with wired connection to the router.
The NC10 prints with no problem as does the desktop. The desktop also operates the scanner with no problem. If I connect the NC10 with USB to the scanner that also works, but it will not scan while connected to the network wirelessly.
I have only just updated from 10.04, and it was working perfectly before the update.
Please help.

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