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Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Message

Re: CS-70m power supply issue, -15V rail is dead

2013-08-01 by cpt.zilog

Excuse 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" <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 !
>     >
>

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