[sdiy] Disassembling MKS-70 Power Supply

Bob Weigel sounddoctorin at imt.net
Mon Nov 3 07:13:55 CET 2008

I don't recall off the top the circuit details but common problems are 
regulator solder joints on those.  If it shuts off after a few seconds 
that MIGHT be the problem..  On the other hand could be some leaking 
electrolytic or something.  But you have to pull a few things out as I 
recall to get that board out.  Get under there and verify the solder 
before you go to a lot of research time though and I'll bet you'll find 
the problem. If you have an esr meter it's nice to check the caps. -Bob

Csaba Zvekan wrote:

> Hi Group,
> My Roland MKS-70 (SUPER JX) 's power supply is failing . After two  
> seconds it shuts off. I am suspecting capacitors on the power supply  
> board. Can anybody tell me an easy way to get to it. Before I make  
> some stupid mistakes?
> It looks like I have to loosen the VOICE boards that are on hinges ,  
> right ?
> I googled the MKS series and they seem to be a bit flaky in age.
> Also maybe one of you knows already the problem. What's the deal with  
> the sensing in the circuit ?
> Any help greatly appreciated
> Csaba
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