[sane-devel] CanoScan N650U (plustek backend) not working with Mac OS X 10.3.2 build 7D24

Henning Meier-Geinitz henning@meier-geinitz.de
Tue, 23 Dec 2003 20:55:52 +0100


On Tue, Dec 23, 2003 at 04:24:13AM +0100, Henrik Rintala wrote:
> With both versions the problem is that scanimage does not seem to be 
> able to connect to the scanner.


> Henrik-Rintala:/usr/local/bin shr$ ./sane-find-scanner
> found USB scanner (vendor=0x04a9 [Canon], product=0x2206 [CanoScan], chip=LM983x?) at libusb:024:002

The question mark after the chip id is a bad sign. It means, that
sane-find-scanner was unable to actuall talk to the scanner. It could
get its didentification but sending commands failed (usually because
the interface couldn't be claimed).

> Henrik-Rintala:/usr/local/bin shr$ ./scanimage -L
> No scanners were identified. If you were expecting something different,


Try enabling debug message. E.g.

To reduce the number of USB messages, diable everything but plustek in

There have been some reports that enabling debugging "fixes" libusb
problems on MacOS X in some cases. Even if it doesn't, you should get
a debug log that shows the exact error message.

Also have a look at the archive of the last few weeks of sane-devel.
There have been some similar reports.