You can get the tv power and volume using codes from Admiral or Dynex tv codes. But the other Roku keys like play, cursor pad and menu aren't preset into any universal remote unless it has Roku Tv listed in the library of codes. Sanyo Roku tv use the same roku tv code as tcl, insignia, onn, magnavox, westinghouse, jvc, and philips roku tv's. So if you're missing the roku remote go to ebay get roku tv remote from one of those brands and it will work on the sanyo. Just stay away from Hisense & Sharp roku tv remotes.
You can go to walmart or best buy and get wifi voice remote that will pair with your sanyo roku tv. Its the Rc-AL7R remote.