Path: utzoo!utgpu!watmath!clyde!att!rutgers!mailrus!cornell!uw-beaver!tektronix!reed!psu-cs!kirkenda
From: kirkenda@psu-cs.UUCP (Steve Kirkendall)
Newsgroups: comp.sys.atari.st
Subject: Re: SC1224 Monitor Buzz . . .
Keywords: monitor,buzz
Message-ID: <1362@psu-cs.UUCP>
Date: 9 Dec 88 00:22:40 GMT
References: <8812030519.AA09468@ucbvax.Berkeley.EDU> <17734@agate.BERKELEY.EDU>
Reply-To: kirkenda@psu-cs.UUCP (Steve Kirkendall)
Organization: Dept. of Computer Science, Portland State University; Portland OR
Lines: 21

Monitor noise usually comes from the flyback transformer.  Flyback transformers
usually operate at about 15000 Hz.  If the coils of the flyback transformer are
loose, they may vibrate at this frequency, producing a high-pitched whine.

I don't have a SC1224 monitor, so I can't describe the innards with any
authority, BUT...

	1) unplug the monitor, and let it sit overnight so any residual high
	   voltage drains off.
	2) open the monitor's case.
	3) look for a "suction cup" stuck onto the back of the CRT.  This
	   should have a single thick wire coming from it, leading to a 
	   big fat disk-shaped thing, wrapped around a metal core.  This is
	   the flyback transformer.
	4) if you can shove a toothpick or something between the big fat disk
	   and the metal core, you *might* get rid of the whine.

No guarantees of any kind, of course; I am not a responsible person.
-- 
"If I seem insensitive to what you're going through,
	keep in mind that's the way I am." -- Mr. Spock