edmund-I am not familiar with Sony receivers, but won't Scan commands only scan the presets already assigned? If that is the way it works, I would think you need a Seek command to find the next tunable station. I didn't see any Seek discretes in the 0158 listing.

If he could get the on-screen display, there is a way to switch between Manual-for manual station selection, and Automatic tune modes, but he can't get that display.