Last week my ailing cousin gifted me with a non-working 4240 quad receiver. He said years ago his step son cranked it up and blew the left front channel. Today I opened it up and found a blown fuse on that amp. Now I want to start a restore on it but can't find a schematic with voltages on it. I've been here on AK and all through Hifi Engine. Anyone know of another source? it can be run as a two channel unit at 40 WPC. Drawbacks is it has no speaker relay protection and (unlike my 2325) all boards are hard wired. Bonus is it has the wooden case. I started today with just a complete cleaning, it was really filthy inside. Haven't De-oxed yet.