no instaling MP520 scanner

after installing the printer driver
(thread: no connection: Canon MP520 & sues 11.1 - openSUSE Forums), I tried to do the same with the scanner.
I read all through this thread
Canon MP540 and libusb - Page 3 - openSUSE Forums

but I got the note

wsra@linux-amq9:~/Desktop> rpm -i scangearmp-common-1.10-1.i386.rpm --nodeps
error: can't create transaction lock on /var/lib/rpm/__db.000

That’s correct, you need to either use sudo or be at the root user
prompt. So in your case it would be;

wsra@linux-amq9:~/Desktop> sudo rpm -i scangearmp-common-1.10-1.i386.rpm

Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (i586) Kernel
up 2 days 12:13, 1 user, load average: 0.28, 0.24, 0.19
GPU GeForce 6600 TE/6200 TE - Driver Version: 180.35

I now have installed scangearmp-common and scangearmp-mp520
Both are shown in yast when searching them under new software installation.
In GIMP it is shown as ScanGear MP… - but when klicking on it nothing happens.

The konsole shows following:

linux-amq9:/home/wsra # scangearmp
Cannot find Canon MFP scanner device.

linux-amq9:/home/wsra # sane-find-scanner
found USB scanner (vendor=0x04a9 [Canon], product=0x1724 [MP520 series]) at libusb:001:002

linux-amq9:/home/wsra # scanimage -L
No scanners were identified.

What can I do?