[sdiy] Dead transformer?

[Roy J. Tellason]

On Sunday 09 December 2007 17:09, Karl Ekdahl wrote:
> Hi list, i'm trying to fix a Ashly XR1001 crossover and it seems to me like
> the transformer is dead, however i'm not entirely sure on how to determine
> this so i'd just like to verify wheter my assumptions are correct.
>
> Basically i get a big primary current draw at no secondary load, about
> 500mA for 60V input - the primary current draw is supposed to be next to
> zero if the secondaries are unused, right? I also measured the inductance
> of the primary winding and the 2-3mH i got seems very small comparing it to
> other transformers i measured where i got 200-5000mH.

Sounds like you might have a problem there all right...

My test for these is to connect a light bulb in series with the primary.  If 
the bulb lights up with anything approaching "normal" brightness,  the 
transformer primary has shorted.  Or something.  A 60W bulb should do the 
trick.  Or use whatever's handy,   it's not critical.

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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