I have had this piece for a little while and in the beginning everything was fine. One day after a few weeks of non use I hooked her up and got no sound. Lights up, tunes stations, no relay click. The biggest problem for both my tech and myself is there is no schematic available. It is not included in the service manuals we were able to find. My tech even checked with his contacts at Sony with no luck. Anybody have a schematic for this or know where I might get one?