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From: jvc@mirror.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Leaving AT on overnight (good/bad)
Message-ID: <206900077@mirror>
Date: Mon, 31-Aug-87 07:55:00 EDT
Article-I.D.: mirror.206900077
Posted: Mon Aug 31 07:55:00 1987
Date-Received: Fri, 4-Sep-87 05:22:01 EDT
References: <1246@bloom-beacon.MIT.EDU>
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Nf-ID: #R:bloom-beacon.MIT.EDU:-124600:mirror:206900077:000:1150
Nf-From: mirror.UUCP!jvc    Aug 31 07:55:00 1987


/* Written 11:49 am  Aug 17, 1987 by magore@watdcsu.UUCP in comp.sys.ibm.pc */
>... It's interesting to see
>what happens when a fan in a power supply passes it's MTBF and dies [ they
>must have clocks in them :) ] What happens next could be termed 
>"short term burn in" ... :)

At the last place I worked at I was responsible for 5 IBM XTs.  Four
of the XTs where used in the offices (8AM - 5PM) and where shut off
every night.  The other one was turned off only on weekends since
it was used in the manufacturing area which was open 24 hours a day.
I never had trouble with the four that were cycled daily (except for
the first month or two when we had several defective drives/boards
replaced) but one weekend the manufacturing XT was left on.  When
I came in on the followin Monday I discovered that the fan in the
power supplied had failed.  Three boards and one hard disk drive were
damaged as a result.

Seems rather risky leaving the machines on for extended periods of
time when unattended.  Also seems like a waste of electricity to
have the machine on for 24 hours a day if you're only going to use
it 9 hours a day.

jvc@mirror.tmc.com