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From: briand@tekig4.UUCP (Brian Diehm)
Newsgroups: net.micro.mac
Subject: Re: "Ultrasonic" hearing
Message-ID: <464@tekig4.UUCP>
Date: Thu, 16-Jan-86 12:59:25 EST
Article-I.D.: tekig4.464
Posted: Thu Jan 16 12:59:25 1986
Date-Received: Sun, 19-Jan-86 04:34:04 EST
References: <1280@brl-tgr.ARPA> <590@harvard.UUCP> <11370@ucbvax.BERKELEY.EDU> <251@birtch.UUCP> <1115@oddjob.UUCP>
Reply-To: briand@tekig4Diehm.UUCP (Brian Diehm)
Distribution: net
Organization: Tektronix, Beaverton OR
Lines: 19

>I have had the same problem with my Mac, and also found that the "sharp rasp"
>(read: "swift kick") solution is usually effective.  Why is this?  I never
>had the problem before I blew my power supply, and had to replace the analog
>board.  Can anybody suggest a possible solution (or a reason why this problem
>would suddenly crop up, for that matter)?

I also am interested in a solution to this one!  My home Mac will (sometimes)
suddenly take up this squeal (I assume 15.5kHz) after a half hour of silent
running.  Of course, when I attempt to run it without the case so that I can
identify the offender, it never heats up enough to start this up.  Unfortunately
for me the "sharp rasp" doesn't work - or I'm not willing to "rasp" it sharp
enough as I paid for it myself - it isn't the company's!

Does anybody know where to start looking?  Or should I just leave it on for a
long period unattended, and after it fries have the analog board replaced!
Ahem.

-Brian Diehm
Tektronix, Inc.