Symptoms:
OpenOffice or xsane cannot see my network connected scanner
Cause:
CUPS queue not configured properly
Solution:
For network scanning, the "hp:/net/..." URI must be configured in the CUPS queue for auto-discovery by OpenOffice and xsane. You can manually specify the URI with xsane using the following format:
xsane <"hpaio" device uri>
For example:
xsane hpaio:/net/PSC_750?ip=12.25.63.142
(Where the CUPS installed device URI is: hp:/net/PSC_750?ip=12.25.63.142, and the hp: was replaced with hpaio:)