[sdiy] Fixed it!

Tom Wiltshire tom at electricdruid.net
Fri May 18 00:03:53 CEST 2018


It’s ok, you make sure that it’s unplugged while you do it!! ;)

> On 17 May 2018, at 20:15, john slee <indigoid at oldcorollas.org> wrote:
> 
> 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 <mailto: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 <mailto:timr at circuitabbey.com>
> 
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