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From: wright@usceast.cs.scarolina.edu (Steve Wright)
Newsgroups: comp.sys.sgi
Subject: Failing 4D/70GT power supply.
Summary: Our power supply is dying.
Keywords: noise power supply fail
Message-ID: <wright.670092606@usceast.cs.scarolina.edu>
Date: 27 Mar 91 16:50:06 GMT
Organization: USC  Department of Computer Science
Lines: 56

This is being posted for an associate please respond to:

    peter@epoch.geol.scarolina.edu or
    peter@ocean.geol.scarolina.edu (ocean is the one dying)

Hi!

I have kind of an urgent problem here, our SGI is dying fast.  Our
local tech guy just disassembled our unit and diagnosed a failing
switching PS.  We have no docs on the PS and I was wondering if any of
you guys knew where we could get a PS and/or docs?

We do not have a maintenance contract any more ($$$) so we are trying
to help ourselves.

Here is what we do know:

machine:			SGI 4D/70GT
age:				~2-3 years
Serial number:			11714
country of origin for PS:	Germany (?)
manufacturer of PS:		Mighty Mite-A (?)
misc. info. off PS:		115v 30A input
				BAUART
				GEPRUFT (umlaut on U)
				TUV	(umlaut on U)
				1000W
				5v 200A
				12v 20A
				5.2v 5A
				12v 5A (-12v maybe?)
				7" (18 cm.) W
				5" (12.5 cm.) H
				12" (31 cm.) L

Of course, we would also like data sheets, schematics, (a CRAY YMP of
our own,...), etc.

The symptoms include: a medium-high pitched ringing and video problems
(ripple and video detritus -- windows leave bits after they've gone &
scrolls are not clean)

Any E-mail to: peter@epoch.geol.scarolina.edu

peter hoffman
u. of south carolina
geological sciences

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-- 

Steve Wright              |  Systems Programmer          +1 803 777-4611
wright@cs.scarolina.edu   |  Dept. of Computer Science   -   LeConte 216
...ncrcae!usceast!wright  |  Univ. of South Carolina, Columbia, SC 29208