Generally, pro switchers are "simple" and repetitive. Not simple enough for me to fix of course, but reasonable if you can find a manual. And pro manuals are often service manuals, too. Can you post a pic?
Eehh, if it's this thing:
https://books.google.com/books?id=XA...ntures&f=false
I take back what I said about 'pro' stuff, unfortunately.
Does 'coax' mean F-type connectors, or RCA, or BNC?