From: cpt.zilogSent: Thursday, August 01, 2013 5:20 PMSubject: [vintagesynthrepair] Re: CS-70m power supply issue, -15V rail is deadExcuse me but I'd like to know if I did say something false or stupid in my previous message ?
Don't want to sound rude, but if my idea is wrong, my ego can handle it as long as someone corrects me (and write it!) ;)
Thanks
>
> --- In vintagesynthrepair@yahoogroups.com, "cpt.zilog" wrote:
> >
> > Hello guys and sorry to jump in like that but I would suggest to change the big caps as a priority and then check the bridge rectifier again for leakage of AC current.
> >
> > I had a big problem with a D&R console's psu in which the voltage regulators kept on going Kapput. Turned out that the big Electrolytics were bad and that induced a big stress on the rectifier bridge, which in turn had the consequence of not only letting DC pass as expected, but also AC at the same time !
> >
> > I did test for AC leakage on the rectifier after the newly installed voltage regulator worked for a couple of seconds before shorting...
> >
> >; After new BIG caps, new bridge rectifier and a 2nd new voltage regulator, everything was sorted.
> >
> > Good luck !
>; >
>
Message
Re: [vintagesynthrepair] Re: CS-70m power supply issue, -15V rail is dead
2013-08-01 by Peter Mörck
I don't think there was anything stupid in your
post :)
In a previous reply I think I did ask him to check
the rectifier and for the presence of AC using a scope.
If there was none, I would assume he drew the
conclusion that the rectifier and caps are fine.
I don't know what the result was (or I forgot
if Adrian told us).
BR,
Peter
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