Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!unmvax!nmt.edu!jcksnsr
From: jcksnsr@nmt.edu (JC)
Newsgroups: comp.sys.atari.st.tech
Subject: 520 ST power supply
Summary: Tranformer blowup.
Message-ID: <1991Apr30.021744.1728@nmt.edu>
Date: 30 Apr 91 02:17:44 GMT
Sender: jcksnsr@jupiter.nmt.edu
Organization: New Mexico Institute of Mining and Technology
Lines: 26


   Well, well, I was just typing along on my 520 ST this morning when
crash, boom, incloud of noxious smoke my power supply fried.

   Upon opening it I find two of the four rectifier diodes have gone to
silicon heaven.  Simply, a quick trip to Radio Shack and a little work
with a soldering iron and the diodes are replaced.

   No luck, I then find out that the primary coil of the transformer is
now open and thus quite useless.  (Mustof been some burn out, too bad the
supply was under the desk where I couldn't see it.)

   So I call around and discover the replacement is $65.00.  About one
sixth the total value of the computer, gack.

   So the question comes down to this, 1) Does anyone know what the specs
on the tranformer are and how it is wired so I can replace it myself (unlike
the diodes the transformer is completely void of useful identifications) and
2) if not anyone know where to get a 520ST power supply cheaply and quickly.

   I really wish I knew what happened, I'm assuming a surge since the
computer is apparently unharmed and the fuse in the power supply is intact.
But, if it was a surge, there was nothing happening today and it went 
through two surge protectors in the process.

JEff