it appears your scanner is unsupported:
http://www.sane-project.org/lists/sane-mfgs-cvs.html
http://www.sane-project.org/unsupported/canon-4400.html
Mike C
From: lorenzo.travaglio at fastwebnet.it
To: sane-devel at lists.alioth.debian.org
Date: Mon,
I'm having problems getting my scanner working
HP scanjet 6200c
Fedora 8
Kernel: 2.6.23
Sane: 1.0.18
It Currently works 100% in windows.
It worked with Linux/sane in the past (6months or more.. don't use it that
often so hard to say)
Sane has no problem detecting the scanner.
Other USB devices
