Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!mcvax!ukc!reading!sage.cs.reading.Ac.Uk!gordon
From: gordon@sage.cs.reading.Ac.Uk (Simon Gordon)
Newsgroups: net.micro.atari16
Subject: Re: Atari 520ST power supply failure
Message-ID: <172@sage.cs.reading.Ac.Uk>
Date: Fri, 16-May-86 22:48:35 EDT
Article-I.D.: sage.172
Posted: Fri May 16 22:48:35 1986
Date-Received: Fri, 23-May-86 22:36:20 EDT
References: <2459@watmath.UUCP> <3408@ukma.UUCP>
Reply-To: gordon@sage.UUCP (Simon Gordon)
Distribution: net
Organization: Comp. Sci. Dept., Reading Univ. UK. (sage)
Lines: 37

In article <3408@ukma.UUCP> knnngt@ukma.UUCP (Alan Kennington) writes:
>
>
>But now the problems seem to be of
>three kinds:
>(1) Too much voltage on the 5V line.
>(2) Too much smoke from the "brick".
>(3) Blowing the MMU when extra RAM is added.
>Now the question may be asked whether these are mutually exlusive, or
>independent etc. My old supply had (1) but no (2). And I never tried (3).
>        So long,   Alan Kennington.

I have made a reply elsewhere with respect to this, but this article prompted
me further.

Why did your computer not blow at first ? This is simple. If a component is
being driven too hard (the extra power drawn by extra roms) then, it may
cope apparently ok for a bit before the extra stress on the component forces
it to pack up.

My first ST was purchased last september. At Xmas it packed up - it was working
ok, I turned it off, had lunc, turned it back on and it just came up blank.
Silica Shop (the major british supplier) replaced it (after a bit of a tussle).
(just the keyboard that is)
In april I had the 1 meg ram upgrade done for me (with the resisters) and roms
finished. My machine is still ok despite the power supply being the origanal
september one and my machine having to stand being moved to and from university
often on a motorcycle.

One interesting point was that the replacement (and it was definately not MY
one repaired) had obviously been 'fiddled' with as the people that did the
ram upgrade said that a couple of the ram chips on the board had been replaced
and some chips had been resoldered. Sujesting it was a blown and repairred
replacement - even though they sent it out with a new set of manuals, disks,
and mouse (so I have two sets of these)

Odd. From Simon Gordon @ Sibly Hall , Reading , UK