fan speedup-power supply question
~XT6562000~Bill Simeon~C82~rfe~xxxx~
wgs at cuuxb.ATT.COM
Thu Jun 13 22:28:29 AEST 1991
In article <1991Jun12.125517.9615 at news.gvl.unisys.com> derekp at 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.
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