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From: ken@maxepr.UUCP (Ken Brassler)
Newsgroups: comp.sys.att
Subject: Re: Weird 3b1 fan behavior
Message-ID: <490@maxepr.UUCP>
Date: Sat, 21-Nov-87 22:27:32 EST
Article-I.D.: maxepr.490
Posted: Sat Nov 21 22:27:32 1987
Date-Received: Mon, 23-Nov-87 06:54:48 EST
References: <21740@ucbvax.BERKELEY.EDU> <313@bilanc.UUCP> <624@pttesac.UUCP>
Reply-To: ken@maxepr.UUCP (Ken Brassler)
Distribution: na
Organization: Brassler Engineering Co., Mill Valley, CA
Lines: 21
Keywords: UNIXPC 3B1 fan power

In article <624@pttesac.UUCP> robert@pttesac.UUCP (Robert Rodriguez) writes:
>up until the repairman did this, my fan had *never* changed speeds.
>now it does it about once an hour.

Just to shed a slightly different light on this subject....

My 3b1 has run continuously for 2+ years. About every other month,
the fan starts switching to high blower. This is my signal to get
the vacuum cleaner and suck out the dust from the air input louvre,
which is mainly the front half of the horizontal grill under the
right side of the monitor. Then I suck the dust that has accumulated
on and around the fan blade(s). This proceedure has always returned
the fan operation to normal speed - except about once a year, when
it's necessary to remove the top cover and suck the dust from the
motherboard & power supply.

I suppose if I cleaned my house, this wouldn't be necessary :-)
-- 

Ken Brassler {ihnp4|qantel|pyramid|lll-crg}!ptsfa!maxepr!ken
			   ....ethos!gladys!ptsfa!maxepr!ken