Re: [CAD_CAM_EDM_DRO] Re: Re: tantalum caps was emc success

I'd like to second that motion. I've had very similar experiences. YMMV.

Jeff

On Tue, 21 Nov 2000 23:50:31 -0600, Jon wrote:

>
>
>Yes, I'd do that. It probably is more of a problem in systems that have
>been run for 10 years or so, shut down for a few years, and then fired
>up again. I do know of several cases of equipment under maintenance
>contract, just a couple of years old, where a tantalum cap burned big
>holes in circuit boards. But, I've also run into LOTS of trouble with
>industrial-grade gear that ran for years in commercial service, was
>mothballed for several years, and then I or someone else got hold of
>it and tried to use it for hobby/home shop/home laboratory use, and
>had to replace several tantalum caps to get it running. My last run-in
>was bringing up the antique Allen-Bradley 7320 CNC control.
>When I fired it up for the first time, the power supply kept shutting
>down immediately. I pulled boards in various combinations to
>isolate the shorted boards, and it was bad tantalum caps every
>time. I replaced about 7, I think. Although this was a pretty hefty
>power supply, it sensed the overload and shut down before anything
>could explode.
>
>Jon
>
>