There are all kinds of chemicals available to eliminate the smell and residue of urine. The issue I would be concerned about is discoloration of the cabinet/ driver cone from applying same. TALAS, which provides materials for conservation and archival preservation of things like paper, books and ephemera, might have some experience in directing you to a non-staining cleaner. (You can find them online and call them during business hours).
I guess the other issue is how to prevent the dog from continuing to do this. I’m an animal lover (now have a bunch of cats) but how to do that is outside of scope for me. I don’t let the cats onto the second floor (where my main system is) or in the front "parlor" (where my vintage system resides).
Good luck.