I have an HP ScanJet 4890 connected via USB to my desktop Mac Mini running Lion. Recently, HP finally! updated scanner drivers and my scanner is recognized and works on that machine (connected to a powered USB hub). But I unable to set up scanner sharing. There are two related problems:
When I open Print & Scan system prefs and and click the '+' to add the scanner, the scanner does not appear. I tried first starting the HP scanner app, but the scanner still doesn't show up in Print & Scan prefs. I also plugged the scanner's USB cable directly into the Mini instead of the powered USB hub, with no change.
Probably due to #1, if I enable Scanner Sharing under Sharing prefs, the scanner does not show up for selection.
FYI, I do have other devices - a fax modem and a printer - connected via USB to the Mini, and both are recognized and shared over my LAN.
I've searched through Apple StackExchange, but haven't found anything addressing this problem.