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From: lenny@icus.UUCP (Lenny Tropiano)
Newsgroups: comp.sys.att
Subject: Re: Weird 3b1 fan behavior
Message-ID: <44@icus.UUCP>
Date: Tue, 17-Nov-87 21:39:53 EST
Article-I.D.: icus.44
Posted: Tue Nov 17 21:39:53 1987
Date-Received: Sat, 21-Nov-87 15:20:39 EST
References: <21740@ucbvax.BERKELEY.EDU> <30@icus.UUCP> <618@pttesac.UUCP>
Reply-To: lenny@icus.UUCP (Lenny Tropiano)
Distribution: na
Organization: ICUS Computer Group, Islip, NY
Lines: 42
Summary: I work for a VAR...

In article <618@pttesac.UUCP> vanam@pttesac.UUCP (-Root Admin-) writes:
| [..two previous articles cut out..]
|You guys really make me wonder if the UNIX-PC has gone through some
|revisions that we are not all aware of.  My 3B1 has one fan which hums
|at a steady pitch.  The AT&T repairman who came out to change my hard
|disk out told me that there was a heat sensing circuit in the power supply
|which would shut the system off in case of overheating.  This only makes
|sense.  For a few dollars it would protect the system from a burned out
|motherboard in case the fan failed.
|

I would assume there is some sort of thermostat on the heat sink inside
the UNIX PC.  When the power supply heats up it kicks the variable speed
fan into "overdrive" :-)  It might just be that your computer is in a well
cooled area and it never overheats.  The motherboard is more than I paid
for my computer :-( I hope that never goes!!

|When you say that "you know from experience" do you mean experience
|with an overheated UNIX-PC or do you mean experience with overheating
|of computers in general?
|

I know because a couple of customers have lost their machine (cause was:
fan died ... machine overheated and died)  I work for an AT&T VAR.

|Also, I suspect that either some of these UNIX-PC's have variable speed
|fans, or they might have fan or power supply trouble.
|

I would assume all the UNIX PC's have them?  But who knows?  

					-Lenny
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