Mike,
Did you ever find a solution to this?
I have also just developed the same problem and can find no electrical
reason for it, and I honestly don't understand any mechanical reason for it
to search for that.
--Ryan w8cya
On Mon, Feb 15, 2010 at 2:49 PM, Michael Tope <W4EF@dellroy.com> wrote:
> On 2/15/2010 10:05 AM, Carl wrote:
> > Could be a bad cap, one installed wrong (it will blow eventually but
> > it will get real warm first), missing, miswired or bad equalizing
> > resistor.
> > The transformer is trying to tell you to stop!
> >
> > Carl
> > KM1H
> >
> Carl/Dick, et al.
>
> I triple checked the polarity of the caps before I put the cover on the
> PS and they are installed properly. Also, I didn't see any swelling or
> smell anything from the PWB after I fired up the supply, but I'll pull
> the lid off and take a closer look.
>
> Regarding Dick K5AND's suggestion, the transformer is held is 8 places.
> 4 bolts on the bottom, and 4 on the top. I had the bolts on the top out
> to replace the 50Kohm x 50W power resistors used to derive the cutoff
> bias. That may have changed the mechanical pre-load on the transformer.
> Maybe I'll let the PS warm up and then loosen and re-tighten those bolts
> to see if that helps.
>
> Thanks,
>
> Mike W4EF...........
>
>
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