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From: donch@tekirl.TEK.COM (Don Chitwood)
Newsgroups: comp.sys.mac
Subject: Ticking Mac
Message-ID: <740@tekirl.TEK.COM>
Date: Tue, 8-Sep-87 20:01:59 EDT
Article-I.D.: tekirl.740
Posted: Tue Sep  8 20:01:59 1987
Date-Received: Thu, 10-Sep-87 05:31:02 EDT
Organization: Tektronix Inc., Beaverton, Or.
Lines: 21


My personal Mac at home has developed a rhythmic ticking, roughly a 1 second
cycle.  I opened the case yesterday and used a plastic stethoscope to home
in on the sound.  It was coming from the transformer on the power supply
board (the one mounted fairly low, and probably the main supply transformer.)
Up close, I could discern the ticking to be more complex than I thought.
It was like a 1 sec and a 1.2 second cycle superimposed on each other.  They would 
phase in and out of synch in a repeatable manner.  I also discovered the sound 
was carried by the speaker (earphones made that real clear), but was
primarily coming from the tranny.

All solder joints on the board looked great, no signs of overheating anywhere.

Anyone know if this is a problem of concern, i.e. is a power-board imolation
imminent?  If so, can I get a replacement transformer from apple?  If not,
where is a replacement available?

Thanks in advance for any advice.

Don Chitwood
Tektronix, Inc.