I have a HP Deskjet 3050 J610 all-in-one. Networked printer works like a charm. I would really like to get the networked scan-to-pc functionality working in Precise. I'm not very familiar with the scanning utilies, but scanimage seems to recognize the device. It takes a few seconds trying to connect and then gives the following error:

erin@genoveva:/home/erin/# scanimage > out
scanimage: sane_start: Invalid argument
Running as root (which I've seen suggested other places) makes no difference. I've got sane and xsane installed. How can I start troubleshooting this?