alan@metasoft.UUCP (Alan Epstein) (02/12/91)
My (vintage) Mac + just began emitting an ear-folding high pitched tone, which is giving me a headache. I don't mind the headache so much (bang, bang!), but I'd like to know what causes the tone, and how I can fixed it (if I decide I'd rather not have the headache). Please send replies via e-mail. Avoid net clutter! Thanks. ----------------------------- Alan Epstein Meta Software Corp UUCP: ...bbn!metasoft!alan 150 Cambridgepark Dr Internet/ARPA: alan%metasoft@bbn.com Cambridge, MA 02140 USA -----------------------------
alan@metasoft.UUCP (Alan Epstein) (02/13/91)
In article <2049@metasoft.UUCP>, I wrote: > ... my Mac + just began emitting an ear-folding high pitched > tone... what causes the tone, and how [can] I fix it. Thanks to Ralph Gonzalez for this insight: ___________________________________________________________________________ Return-Path: <uunet!elbereth.rutgers.edu!rgonzal> Date: Tue, 12 Feb 91 08:40:04 EST From: uunet!elbereth.rutgers.edu!rgonzal (Ralph Gonzalez) To: alan@metasoft.uucp Subject: Re: High Pitched Squeal In-Reply-To: USENET article <2049@metasoft.UUCP> One cause of a very high-pitched squeal is when the glue sealing on the flyback transformer becomes unsealed. This often happens when the transformer goes bad, although supposedly it can sometimes happen on its own. If you're lucky, you just need to open up the Mac and pour some epoxy on the flyback to seal it again. Else you might have to replace the transformer, assuming this is what is causing the squeal. Check our Larry Pina's "Macintosh Repair and Upgrade Secrets" for troubleshooting info and addresses of parts vendors. -Ralph