[sdiy] Prophet 5 question

[klosmon]

Karl Ekdahl wrote:
> Hi list, working on a faulty Prophet 5 which has a short on the +15V supply somewhere on the CPU board - i notice that there's some kind of white power-rail distribution tab that runs about 2/3 of the upper PCBs, question; is it a bad idea to desolder this entire thing? It seems like it'd be so much easier to find the faulty parts if the different parts were separated this way. And yes, i have replaced all Tantalum caps on the board and reseated all ICs.
>
> Karl
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>   
Hello-
It wouldn't be a bad idea (so long as you have a decent desoldering 
technique);  it just might not help isolate the faulty component, once 
you've removed it.
The way I usually track such problems down is cutting the major +15 
traces to the different sections of the board to narrow down where the 
fault lies.
On prophet 5 boards, I've found shorts caused by faulty .1 bypass caps, 
faulty opamps and CMOS, and of course the aforementioned tantalum caps.

Good luck.

~GMM