Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!ut-emx!jcc
From: jcc@ut-emx.UUCP (J. Chris Cooley)
Newsgroups: comp.sys.mac
Subject: Re: Mac II power up problem.
Message-ID: <5282@ut-emx.UUCP>
Date: 22 Aug 88 14:13:28 GMT
References: <6839@well.UUCP> <76000276@p.cs.uiuc.edu>
Organization: The University of Texas at Austin, Austin, Texas
Lines: 33

In article <76000276@p.cs.uiuc.edu>, gillies@p.cs.uiuc.edu writes:
> 
> I believe the Mac II has circuitry to keep you from powering it	
> up/down quickly.  So if your machine ran for a few hours, you
> may have to wait a few moments until it cools off, before you can
> power it back up.
> 
Actually, it has nothing to do with heat, but with letting all the 
silicon components "discharge" (for lack of a better word).  Apparently,
there can be damage if an IC which has some arbitrary voltage across
it (from the power-down) gets its regular voltage from the power-up
applied to it.

This is nothing new.  I was told of this back when my Radio Shack
Model 1 was a big contender in the computer ring.  I've personally
seen that computers sometimes don't power up if not let to sit a few
seconds after power-down.

> Don Gillies, Dept. of Computer Science, University of Illinois
> 1304 W. Springfield, Urbana, Ill 61801      
> ARPA: gillies@cs.uiuc.edu   UUCP: {uunet,ihnp4,harvard}!uiucdcs!gillies

					--chris

Disclaimer:  I'm not pretending to be anyone significantly skilled in
             electronics.


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