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From: wgs@cuuxb.ATT.COM (~XT6562000~Bill Simeon~C82~rfe~xxxx~)
Newsgroups: comp.sys.3b1
Subject: Re: fan speedup-power supply question
Message-ID: <5677@cuuxb.ATT.COM>
Date: 13 Jun 91 12:28:29 GMT
References: <1991Jun12.125517.9615@news.gvl.unisys.com>
Reply-To: wgs@cuuxb.UUCP (William G. Simeon)
Distribution: usa
Organization: AT&T Computer Systems, Lisle, IL
Lines: 35



In article <1991Jun12.125517.9615@news.gvl.unisys.com> derekp@gvlf9-m.gvl.unisys.com () writes:

(Preliminary stuff deleted)

>		1. The fan didn't do the speed up slow down trick until after
>		installation of a combo card (in slot 0) AND the occurance of
>		a hot day (No its not in an air conditioned room, no I don't 
>		leave it on all the time) 
>		Is there a connection with the combo card, and slot 0 (under the
>		power supply). There was not a lot of dust under or in the fan.

The DC fans in the 3b1/7300 are dual speed fans. When the temperature inside the
case raises above a set level, they speed up. When it drops, they slow down.
This does NOT indicate a problem, either with the machine in general or the
power supply in particular.

>		2. The power supply: The one I bought was marked 
>			Power Systems: pn PS-1569
>			5v/20a 12v/3.5a -12v/100ma.
>
>			What I foud went I went thru the fan exercise (my supply, which
>			is functional)
>			Power Systems: pn PS-1610-1
>			5v/20a 12v/5a -12v/300ma.
>
>		What is a proper PS for a 3b1. (67 meg drive 3.5 meg ram 1.5 of
>		which is on a combo card)

The proper PS for a 3b1 is the 300ma. supply. 

>		Did I buy a 7300 PS? 

Yep, you did.