Re: [CAD_CAM_EDM_DRO] RT802 DAC board

wanliker@... wrote:

> In a message dated 5/23/01 10:39:55 AM Mountain Daylight Time,
> dengvall@... writes:
>
> << When hot the outputs are about +/- 8v and unstable - which
> > of course means the dac outputs are unpredictable. >>
>
> You might want to take a look for leaky capacitors on the output line. from
> the other post this is a +- 15 volt output and running at 8 volts, means
> leakage somewhere.

Oh, yeah! Of course! Look for those epoxy-dipped Tantalum capacitors
that look like a raindrop. I'll bet one has shorted out. This is a classic
problem on gear that has been out of service for a year or more.
If you are still getting 8 V across it, it should be getting plenty hot
enough to detect the bad one. (Of course, there could be a bad tantalum
INSIDE the DC/DC converter, which will be a problem.)

Jon