DS-1 with ba728

[Bagge]

I know this topic has been dealt with. I'm fixing a friends DS-1, but can't find the schematic for it. It's the one with IC BA728N. It seems the ic is smoked. So I'm thinking about installing a TL072 in there. I also suspect a couple of Trannies is smoked. But I only have a schematic from 1980, and there is slight changes from that one. Any help?

[jonathan perez]

why would they be smoked?

[Bagge]

Because someone clearly didn't use the right power supply for this one. When I first openened it, D1 was only half!!! Some of the solder joints looks as they've been hot. I also seem to get some sort of distortion after Q2, but I will have to recheck, that it's not due to a flat battery or something else.