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From: mweasner@trwrb.UUCP (Michael L. Weasner)
Newsgroups: comp.sys.mac
Subject: Mac H/W Crashes -- Cause
Message-ID: <1512@trwrb.UUCP>
Date: Wed, 7-Jan-87 16:48:11 EST
Article-I.D.: trwrb.1512
Posted: Wed Jan  7 16:48:11 1987
Date-Received: Thu, 8-Jan-87 21:42:15 EST
Reply-To: mweasner@trwrb.UUCP (Michael L. Weasner)
Distribution: world
Organization: TRW EDS, Redondo Beach, CA
Lines: 24


Sometime back I asked for some help on what might be causing my Mac Plus to
bomb when disks were inserted into the internal drive.
 
Thought I would report on the results of my investigations.  I finally got
around to doing something about it this past weekend.  I have a 4" muffin fan
that was connected to my Apple II Plus with some dryer ducting.  I rearranged
things and blew the air from the fan into the Mac's right side bottom vent.
The temperature as measured at the top left vent stabilized at 108 degrees --
down from a normal 130.  (Only a little bit of the air flow goes into the Mac
otherwise the temperature drop would have been greater.)  I then proceeded to
print disk directories for 20 floppies WITHOUT A SINGLE BOMB.  I then even
backed up my hard disk onto 20 floppies without bombing.
 
Without the fan blowing into the Mac, I would bomb on about every fourth or
fifth disk insertion after it had been on for a while.
 
One of these days I'll take the Mac in to get it fixed under AppleCare.  If
the dealer says to add a fan, I'll tell him to go ahead and add one as long
as AppleCare pays for it, otherwise replace the faulty parts.
 
Thanks for the help.
 
Mike Weasner