On Jan 13, 20:28, Tony Duell wrote:
> > On Jan 12, 20:14, jpero_at_sympatico.ca wrote:
> >
> > > Sounds like PSU is reacting to overloading or medium shorts
> > > downstream of that PSU outputs. Also can happen with dried
> > > up capacitors (too high ESR).
> >
> > I don't think it's any of those. The regulators all make a similar
noise
> > when I put them on a dummy load drawing 5A, on the bench. And I'm sure
>
> Have you tried a lighter _or heavier_ load? It can make quite a
> difference.
Yes, it changes the pitch somewhat (as I would expect) and it gets slightly
louder with a heavier load.
> > it's not bad caps, as two of them are ones I repaired recently.
>
> Which, if any, capacitors did you replace?
In one H744, all the electrolytics (the output one had gone, so I figured I
might as well do the lot).
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sun Jan 13 2002 - 21:12:26 GMT