Hi all
Anyone by any chance got schematics for an old Pioneer unit type DC-X55Z ? Only need the bit around the output hybrid and its power supplies, I think. The hybrid has audio going in at both channel input pins, but not a jot coming out on either channel. Basic supplies are present, and no obvious looking anomalies at any pin using the data sheet for the STK. It's not the STK itself, as I hung another in just to be sure. Interestingly, the output protect circuit doesn't seem to be working either as the output relay is never being driven, but there is no significant DC offset on either channel's output, so I'm guessing that there is going to be an O/C resistor or whatever that has some commonality between the protect circuit, and something like the mute pin on the STK, which has about negative 1 volt on it. I can't find anything on the data sheet that details the conditions on this pin for muted or opened.
TIA
Arfa