Ok let's start from begin
Scanner is usb and "lsusb" is showing usb devices connected to computer so first make sure that "lsusb" will show you your scanner, maybe just computer not see your scanner at all ?... <-- it's important melodie
I asked to install "task-printing-scanning" because it have all dependiencies for scanners + printers. I removed all printers + scanners drivers to make ZEN really mini... So I still suggest to install it, or just install task-scanning (I think there is task-scanning - i'm in work now and not using ZEN so name can be little different...)...
I asked as well for "dmesg" if USB scanner is connected than kernel will see it and will load special module for that scanner and will try to connect to scanner <--- that will show as dmesg (dmesg is info from kernel...)
At least I think it should be like that