Path: utzoo!mnetor!uunet!husc6!ukma!rutgers!ames!ucbcad!ucbvax!decvax!tektronix!tekig!tekig5!danm
From: danm@tekig5.TEK.COM (Daniel Milliron)
Newsgroups: comp.sys.mac
Subject: Re: AppleColour Monitor Quirk
Message-ID: <2275@tekig5.TEK.COM>
Date: 22 Dec 87 23:15:43 GMT
References: <57900018@sfu_dipper> <11540094@hpsmtc1.HP.COM> <642@bucket.UUCP>
Organization: Tektronix Inc., Beaverton, Or.
Lines: 15


We have a Mac II with an Apple color monitor and have experienced the same
shimmer/vibration described in previous articles.  I don't know what causes
it, but we have been able to stop it instantly whenever it appears by simply
shifting the monitor a few inches and then back again.  The monitor sits atop
the Mac II box in the typical position.  I have not tried hitting the monitor.

Theory: If hitting the monitor fixed the shimmer, we'd have heard about it,
since hitting is the intuitive thing to do.  Therefore, the problem is 
probably not a loose connection, since hitting would fix it.  Instead, perhaps
there is a marginally unstable feedback loop causing oscillation when excited by
a transient field flux.  Moving the monitor could break the excitation and
stop the oscillation.

Dan Milliron