Vintage Synth Repair

Hello

You have asked recently:


> I found a cheap ARP Odyssey on eBay, and the seller say that it
> powers up, but makes no sound. What's wrong?

and also

> I saw an ad for a Korg Polysix, but the guy selling it says it
> doesn't power up. He says the battery hasn't leaked yet (which I will
> definetly replace if I do get it), and the power LED comes on. What's
> the problem?

and also

> I just contacted a guy who has a non-working Roland Jupiter-4 for
> sale. Any idea where to look for trouble spots?

You need to provide a *lot* more info for any sort of salient response. You 
clearly aren't able to ascertain from the seller the appropriate level of 
detail and unless you are a competent electronics enthusiast (and I suspect 
you aren't, judging by the style of your questions), you ought to leave well 
alone and buy something working.

Your questions are somewhat akin to saying "someone's offered to sell me a 
car but he says it doesn't work.,Any ideas what is wrong with it?" - a 
stupid question, I think you will agree!

RMC, England