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From: chavez@ucbvax.BERKELEY.EDU (Thomas M. Chavez)
Newsgroups: net.micro.mac
Subject: Re:  Power Supply Troubles?
Message-ID: <13770@ucbvax.BERKELEY.EDU>
Date: Mon, 12-May-86 22:49:51 EDT
Article-I.D.: ucbvax.13770
Posted: Mon May 12 22:49:51 1986
Date-Received: Wed, 14-May-86 13:00:26 EDT
Organization: University of California at Berkeley
Lines: 47

In article <13507@ucbvax.BERKELEY.EDU> you write:
>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?)
>
>Any help is much appreciated...
>
>Tom
>ucbvax!chavez

Here is a reply that I got:

Tom;
	A few key words in your article tip me off to the probable cause.
(forgive if this is way late I'm behind with net.micro.mac).  The first
tip is NEW <insert your fan name here>.  The second is JUST TODAY.  This
leads me to believe that the wavy lines came with your fanny mac.  Actually
its not just the fanny macs fault although now I know I wont buy one.  They
should have taken care of this problem.  Those wavey lines are most likely
caused from the magnetic fields  generated by the fanny mac fan.  I installed
(hacked)  a muffin fan into mine and it does the same thing.  Some fans are
worse and some are better.   Just try taking the fan off, presto waves go 
away.  Move it around the tube, have some fun.  For ~95.00 I would have expected
them to work around this some how with shielding or different fans (like those
that come with the monster mac, I dont think they cause waving.)

	If it is really bad and anoying I would get my money back and go for
one of those internal "flapper" types  that everyone
is talking about, although they are hard to get.

Hope it helps
dave schuh


-----------------------

Well, I took my FannyMac off and the problem disappeared!  And when I
put the fan back in proximity to the mac, the waving reappeared.  Such a simple
solution.  Now, should I get rid of the fan and have a smooth screen or
keep it and watch the waves...
 
Thanks for all the replies...  Hope this helps someone.
 
Tom Chavez
ucbvax!chavez