Factory faxed a diagram which I no longer have.
Call and ask for Leonard -he'll certainly help.
Oh, by the way, I now own an ARC LS-9 which is a steal for the (used) asking price ($500 - $600).
I'm just puzzled why this pre sells so cheap.
I'd get an LS-9 before an LS-1 (bal in/out, remote, etc.).