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From: rab@bilanc.UUCP (Richard A. Bilancia)
Newsgroups: comp.sys.att
Subject: Re: Weird 3b1 fan behavior
Message-ID: <313@bilanc.UUCP>
Date: Thu, 12-Nov-87 17:32:12 EST
Article-I.D.: bilanc.313
Posted: Thu Nov 12 17:32:12 1987
Date-Received: Sun, 22-Nov-87 12:01:27 EST
References: <21740@ucbvax.BERKELEY.EDU>
Distribution: na
Organization: Computer Guidance & Support - Littleton, CO
Lines: 35
Summary: Yes, but also...

In article <21740@ucbvax.BERKELEY.EDU>, maddox@renoir.Berkeley.EDU (William Maddox) writes:
> The 3b1 apparently uses a variable-speed fan.  On mine, the speed varies
> rather erratically.  Not only are the speed changes annoying to the ear,
> but the fan seems to be running slowly most of the time, such that the air
> leaving the fan is warm enough that I am concerned that the machine may
> not be adequately cooled.  
> 
> I also have an older 7300, which has two fans that appear to always run
> at a higher speed.  It is quite a bit noisier, but runs cooler and is
> less annoying to listen to while trying to read or think.
> 
> Has anyone else observed this behavior?  Is it normal for the 3b1?
> Is there any way I can modify the machine to run the fan at full bore?
> Is there any reason why this would be a bad idea?

I've owned an original 7300 since May 1985 that recently got fried by a
direct lightning strike.  The replacement is a new 3B1 that had the same 
single two speed fan that you described.  However, while still under
warranty the fan was replaced by AT&T after it stopped cooling sufficiently
and caused the power supply to automatically shutdown (it has a
thermostatically controlled switch).  The replacement fan ALWAYS operates
at the single high speed.

Rich
---
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