Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!rochester!rit!ultb!clf3678
From: clf3678@ultb.isc.rit.edu (C.L. Freemesser)
Newsgroups: comp.sys.atari.st
Subject: Re: Dead Mega2
Summary: Power supplies
Message-ID: <1902@ultb.isc.rit.edu>
Date: 11 Jan 90 04:10:24 GMT
References: <3906@jhunix.HCF.JHU.EDU>
Reply-To: clf3678@ultb.isc.rit.edu (C.L. Freemesser)
Organization: Information Systems and Computing @ RIT, Rochester, New York
Lines: 43

In article <3906@jhunix.HCF.JHU.EDU> rick@jhunix.UUCP (Eric Ruck) writes:
>
>OK, I've got a dead Mega 2 ST.  Probably the power supply.  For about 20
>seconds it sounded like there was a piece of paper caught in the fan, then
>the thing completely blacked out, no power light or anything.
>
>Thus far, my alternatives to getting it repaired seem to be either having one
>local repair center cannabilize a 1040 power supply at a cost (parts and
>labor) of around $200, or having the thing sent back for $60 and six or so
>weeks, none of which seem attractive to me.
>
>Is there anyone who has had this problem, and can suggest a way a couple of
>undergraduate EE majors can fix it?
>

It's always been my OPINION that the internal power supplies found in ST
computers have been wimpy.  Yours may have just gotten overloaded or
something.  Who knows.  What we DO know is that it is dead.

Is it worth putting another one in?  I'd say no.  Try something else.

I have my 520, 2 drives, and XE hooked up to a single power supply.
It's a nifty no-RF unit I picked up from Computer Software Services (the
8-bit folks who manufacture the SUPER ARCHIVER and BLACK BOX).  It puts
out 5V @12A, 12V @1.5A, and -12V@ .5A.  If you'd be interested in it,
give em a call:  716-586-5545.  It's $80 or so, but it's worth it.  You
won't have to worry about wimpy power supplies.

I've never seen how Atari has the internal power supply hooked up.
Whether it is done with wires, or terminals soldered right to the
motherboard, I don't know.  The external supply is certainly less than
$200, and you won't have to wait 6 weeks for it.

You might also try Best Electronics.  They can probably set you up with
a new Mega supply.  The part number is :  CB101507.  No price listed.
As for replacing it yourself, it should be quite easy.


Chris Freemesser, Rochester Institute of Technology :BITNET:%clf3678@RITVAX
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