[sdiy] Fixed it!

[Sarah Thompson]

Yes, and in 95% of cases there's something wrong with a power rail. :-)

On Wed, May 16, 2018 at 2:04 PM, 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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>



-- 
[s]
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