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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
---In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
> I was wondering if somebody might be able to help suggest what toI'd recommend to trace the +12V from the bus connector to the mentioned pins
> 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
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