Manuals doesn't have the work reset in it.
https://www.manualslib.com/manual/339807/Yamaha-Avx-700.html
https://www.hifiengine.com/manual_library/yamaha/avx-700.shtml
except for the remote.
It's old enough that it's not computerized. No inputs to assign. You would just go through the surround sound set up. If you are selling it just set all the speaker levels to zero db.