If it's the TPN1110 supply, the PA supply is very
simple. A ferro-resonant transformer, two diodes, and
LOTS of capacitors. The transistors are for the
low-current regulated supply.
One diode could be open. If so, I'd expect a lot of
ripple on the supply and low voltage. If one cap was
bad, I doubt you'd even notice it.
The PA could also be drawing a lot more than the 25
amps the supply is rated for, thus giving you less
voltage to feed it.
Your wattmeter or load could be in error, thus forcing
the above condition.
Bob M.
======
--- kk2ed <[EMAIL PROTECTED]> wrote:
> Good Afternoon,
>
> While going thru my Micor stuff, I found that one of
> my station power
> supplies (TRN1011?) suffers from voltage sag under
> load. I know that
> by design the power supply voltage should drop under
> load. Most will
> idle around 15v, then drop to about 13v under load
> of a 100w PA. But
> this unit is sagging to almost 11v under heavy
> loads, thus resulting
> in the PA output being lower than normal. Anyone
> have this issue
> before and know what the cause might be? One of
> the two
> pass/regulator transistors bad? Transformer on the
> way out? Or bad
> cap? Suggestions appreciated before I tear into it.
>
> Eric
> KE2D
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