"The Real Andy" .pearson@wayit_dot_com_dot_au_remove_the_obvious_ to_reply
wrote in message ...
On Fri, 11 Jun 2004 10:54:03 +1000, "Peter"
wrote:


"The Real Andy"
.pearson@wayit_dot_com_dot_au_remove_the_obvious_ to_reply
wrote in message ...
On Thu, 10 Jun 2004 06:07:09 -0400, "Art" wrote:

Foprward / Reverse resistance is normally a reliable rectifier check.
However it will not indicate failure under load, if in question it
would
probably be best to replace the device in question and the filter caps
in
the same circuit. However don't attempt this after a couple "Fosters"
Eh,
cheers gov.

Despite commom belief, Fosters is rarely consumed here in Australia.
In fact, it is the worst tasting beer I have ever consumed, aside from
a few of my experimental homebrewed beers!

PS, I have replaced many a rectifer under the influence of a fine
beer. As suggested though, the test may not prove anything as the
rectifier is not under load on a multimeter. But in my professional
beer swilling opnion I believe that 99% of dud rectifiers can be
checked on a multimeter!

I am having real difficulties sourcing a replacement rectifier.
Not to mention that if 99% of them can be tested out of the circuit and
this
one checks OK it probably isn't faulty?

It is S4VB20, manufactured by Shindengen in Japan

(http://www.shindengen.com/content.cf...archresults&pr
o
ductCode=s4vb20)

I have tried Jaycar, WES and Farnell, but no one seems to stock it.

I was wondering, if I replaced it with a similarly speced rectifier, how
likely is it to affect the circuit?

Thats just a standard 4A rectifier. Take it to dick smith or jaycar
and find a 4a unit that will fit. IF jaycar's ZR1314 will fit, then
use it.

A long link, but it might work. You may have to cut and paste the
lines as the link may spread itself over multiple lines depending on
your newsreader.

http://www1.jaycar.com.au/productVie...words=rectifie
r&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Ke yword2=&pageNumber=&priceM
in=&priceMax=&SUBCATID=


BTW. As you may be aware, the problem may not be the rectifier, but
with out replacing it, you cant rule it out.

OK, replaced the rectifier with the above one from Jaycar, but the symptoms
are exactly as they were before replacing the cap. :-(

A few minutes after turning the piano on, I get a "pop" sound through the
speakers and all goes silent. Turning the piano off and then on again
brings it back to life and it works for a while.
And I can still smell the strong fishy smell coming from somewhere but I
cannot locate it. Very strange. No, I don't have a dead fish in there :-)
It must be some component overheating or leaking, but which one?

Is replacing all the caps the next step? It seems like hitting a mosquito
with a hammer.