[sdiy] Fixed it!

john slee indigoid at oldcorollas.org
Thu May 17 21:15:03 CEST 2018


Probably something like this killed my beloved LeCroy scope, too, but I'm
afraid to go poking around near mains :-/

John

On 16 May 2018 at 21:04, Tim Ressel <timr at circuitabbey.com> wrote:

> My beautious HP3456 went sideways. Measurements were off. Made me sad, so
> I tore it apart and poked around starting with the power supplies. I found
> huge AC signals on one of the rails. Turned out to be a voltage doubler
> making about 33V. So I removed the 35+ year old caps and replaced them with
> (much smaller!) new ones. I hit a few of the old caps with an ohmmeter to
> see if they would charge. The main filter cap was okay but others were just
> plain open (dry?). Anyway, the meter works once again!
>
> The moral of this story is: Don't be afraid to crack it open and check
> under the hood. It cost me less than $6 to fix it! Re-capping is not just
> for amps as it turns out...
>
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
>
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>
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