Vintage Synth Repair

Thanks for the suggestion; I was wondering about the possibility of it 
being cap-related.  I'll plan on opening it up this week and inspecting 
the boards.  I hear so many conflicting opinions regarding the 
replacement of electros; some say just go through and replace them as a 
preventive measure in older synths, while others seem to insist that the 
majority of these caps get replaced unnecessarily.  Obviously, if there 
is leakage evident as you've suggested, the replacement is warranted.

Thanks again!


thirteentech wrote:
> --- In vintagesynthrepair@yahoogroups.com, gnw <atonal@...> wrote:
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>> My MS-20 is acting up a bit, and I'm wondering if any of you have 
>> encountered and/or resolved similar problems to these.  
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> Sounds like a classic case of BCB contamination, where the problem varies with humidity/temperature. As it is pretty impossible for something to get poured into an MS-20 due to it's case design, perhaps a cap has leaked in there? Every MS-series synth I have had in for service lately has had bad electro's, they seem to be reaching their use-by date in those synths, and need replacing. My PS3100 was the same, every electo had leaked and started corroding the boards. In MS synths the leakage is much less, usually just some green on one of the legs of each cap.
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