Here is the definitive how to:
- Read this entire post.
- Download and install Avasys drivers
- Determine your printers IP address by going to System > Administration > Printing, then double click on your printer to view the location (ex. 10.0.0.3:515). If your printer is not there go to "Add" > Network Printer. Your printer should load in below the text Network Printer after a few seconds. Then follow the install guidelines selecting the Avasys driver.
- Enter your printers IP address in the driver configuration file /etc/sane.d/epkowa.conf
Your ip address will be added in the formatCode:gksudo gedit /etc/sane.d/epkowa.conf
- Log out and then back in
- After that you should be able to use simple scan to scan wirelessly.
I am 90% certain that the driver/program iscan doesn't actually need to be installed, but that is how I did it and it worked. Best of luck.