[time-nuts] Re: HP53131 Power Supply shortened

[Bob kb8tq]

Hi

The PSU in the 131 is a known weak point. Usually when they die, they
take a lot of parts out in the process. The good news is that the PSU in 
the 53181 is the same as the 131 PSU. Since 181’s tend to sell for “not
much” they are a fine parts donor ….

Bob

> On Dec 8, 2021, at 5:53 PM, Marek Doršic <marek.dorsic at gmail.com> wrote:
> 
> Hello,
> 
>    while taking a measurement my HP53131a counter sparked and became quiet. After tear down I found both 3A/240V fuses in the PSU burnt. Before pluging a new set of fuses, is there a knowledge of a common problem that couses a shortcircuit at the HV side?
> 
> The counter has also a spilage at the bottom side of the mainboard, but as it is same as in Gerry Sweeney's youtube video (HP 53131A Teardown and Spillage Clean-Up <https://www.youtube.com/watch?v=czCLXrUPX0o>) and his counter still works I assume it is not related. Is it a good practice to get it cleaned?
> 
>   .marek
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