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From: hal@ecsvax.UUCP (Hal Hunnicutt)
Newsgroups: net.micro.mac
Subject: Re: Power Supply Troubles?
Message-ID: <1506@ecsvax.UUCP>
Date: Thu, 1-May-86 18:01:47 EDT
Article-I.D.: ecsvax.1506
Posted: Thu May  1 18:01:47 1986
Date-Received: Sat, 3-May-86 02:48:48 EDT
References: <13507@ucbvax.BERKELEY.EDU>
Organization: North Carolina Educational Computing Service
Lines: 38

> Just today my Mac screen started waving back and forth, sort of rippling from
> top to bottom.  I don't think that I am over heating because I have my new
> Fanny Mac keeping the temperature down, and the line voltage is right at 120V.
> Has anyone else seen this problem?  Is my analog board going to blow?  Should
> I buy Apple Care before it does?  (How much is an analog board?)
> 
[]
Some time ago, after blowing 3 power supplies (ouch!), I decided to cool
the sucker off.  I took an ordinary desk fan and set it on top of the
mac blowing down on the power supply vents.  Rather crude, I would admit
but it made the screen do a wild belly dance exactly as you describe.
I suspect its an RF interference, because the waving would decrease the
farther I moved the fan away from the mac.

My eventual solution, by the way, was not to wait for a commercial fan
and pay ~130 bucks for it.  I went down to the local Radio Shack and
bought one of their little 4" general purpose fans.  It's a near perfect
fit between the back of the disk drive and the mac frame.  A velcro
patch on the bottom and a little styrofoam wedged on either side provide
more than adequate security.  All I had to do was connect one wire to
the ground on the frame and the other to the power switch and presto!
An internal fan with instant power-on -- for $15!  It's a little on the
loud side, but it's nothing I couldn't get used to for the price (not
to mention $100 a power supply).  Besides that sucker is cranking out
about 32 cubic feet per minute (twice as much as System Saver Mac), so
you cna rest assured that it never gets the least bit warm.  I've done
two such installations and it takes about 10 minutes.

Hal Hunnicutt    hal@ecsvax.UUCP
> Any help is much appreciated...
> 
> Tom
> ucbvax!chavez


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