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A fix for a USB scanner not found issue Other Hardware
For a while I have been trying without success to scan directly from my iMac. Surfing the web suggests I am not the only Snow Leopard user who has experienced the problem of getting a Mac to recognise an all-in-one USB printer/scanner.

The troubleshooting tips from the Apple knowledgebase article USB and FireWire Quick Assist did not provide the solution. However, one of them made me think there might be another type of device causing a conflict. I got my iMac, running Snow Leopard 10.6.5, to recognise my USB connected HP Photosmart C7280 by removing two unconnected cell/mobile phones from my computer's list of paired Bluetooth devices.

[crarko adds: I haven't tested this one. The relationship between USB and Bluetooth is something to be on the lookout for when troubleshooting peripheral problems in general.]
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A fix for a USB scanner not found issue
Authored by: marktheweinberg on Nov 23, '10 02:31:41PM

My problem with my Epson CX9400F all in one was that Image Capture wasn't recognizing the scanner. The problem was solved when I turned off Bluetooth. I had bought an Apple Magic TrackPad, which requires Bluetooth, just before upgrading my OS X from 10.6.4 to 10.6.5. When I turn off Bluetooth, Image Capture (and apps that use it such as ReadIris Pro for OCR, PDF Pen and Preview) works fine. With Bluetooth on, Image Capture can't find the scanner.



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A fix for a USB scanner not found issue
Authored by: HansBR on Nov 24, '10 05:29:51AM

I had problems with an HP All-in-one Officejet J4580, because the HP software never scanned anything. I tried
VueScan half a year ago and it did not work either, but a month ago,v8.6.6.6 works flawlessly!



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A fix for a USB scanner not found issue
Authored by: upi on Jun 21, '11 09:51:03PM

Turning off bluetooth (Snow Leopard) worked for me too.
I was attempting to scan using HP OfficeJet J4500



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