[sane-devel] HP SCANJET 4500c trouble

[Ilia Sotnikov]

On Thu, Dec 31, 2009 at 9:47 PM,  <gcasados at solar.cinvestav.mx> wrote:
> I have an HP SCANJET 4500c scanner. It works well under Windows but I want
> get rid off such operating system. I found my scanner is supported by SANE
> development source using HP5590 backend.

Hello, Gaspar!

The support of the scanner was added only based on the assumption that
is's more or less similar to HP 5590/5550 models. In the other words,
I haven't tested it on real hardware. Now it's time to do that ;)

> When I issue the command
> sane-find-scanner it returns:
>
> This is sane-find-scanner from sane-backends 1.0.21cvs
...
>    checking for HP4500C/4570C/5500C/5550C/5590/7650 chipset ...
>    Didn't get correct confirmation for USB-in-USB command (needed: 0x01,
> got: 0x00
> <Couldn't determine the type of the USB chip (result from sane-backends
> 1.0.21cvs)>
>

The confirmation error is rather strange - haven't seen that before.
However, the error sane-find-scanner reports doesn't always means that
you couldn't use the scanner at all - the utility serves only
diagnostic purposes.

>
> What could be the problem with
>
>    checking for HP4500C/4570C/5500C/5550C/5590/7650 chipset ...
>    Didn't get correct confirmation for USB-in-USB command (needed: 0x01,
> got: 0x00 ?

At least, the error explains why sane-find-scanner reported no devices.

Could you, please, try to scan eg. using scanimage with backend debug
enabled? The command
SANE_DEBUG_HP5590=50 scanimage 1>img.pnm 2>hp5590.log
will do that, you will get the debug information in hp5590.log and
resulting image in img.pnm.

Thanks in advance,
-- 
 Ilia Sotnikov