Doepfer

> I was wondering if somebody might be able to help suggest what to
> try here. One of the four ADSRs is broken in mine, the last one.
> The first thing I checked was the voltages present at the IC
> supply pins, and immediately noticed a problem. The +12V supply
> is present at the header and R15, but everywhere else appears as
> about -0.6V. So the TL084 and 555 and powered between -0.6V and
> -12V, or -0.6V and ground.
>
> Any ideas why the positive supply is like this?

I'd recommend to trace the +12V from the bus connector to the mentioned pins
by means of a magnifying glass. Maybe the pcb track is interrupted anywhere.
Maybe near a pad that was damaged because of excessive force applied to the
corresponding electronic part. If the +12V are not present at the bus
connector the bus cable is probably damaged.

Best wishes
Dieter Doepfer

It works! You were correct, Dieter. The track was severed at the header pads. I was guessing some more complicated electronic problem. Since I removed the 10 UF power caps, I just replaced them and ran the +V lead along the trace to the header, soldering it to the trace and then the +V header pin.

Thank you!

CJ