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Article #11564

Re: MacPlus SIMM upgrade => crashes++

#11564
From: Joseph Judge
Date: Mon, 09 Apr 1990 15:44
50 lines
2358 bytes
In article <807@runxtsa.runx.oz.au> ghhsmith@runxtsa.runx.oz.au (G.H.H Smith) writes:
>
>RE: SIMM upgrade to 2.5 meg causing problems <792@runxtsa.runx.oz.au>
>
		.
		.
		.
> >   the system that you only have 1 Mb of memory.  Other than that,
> >   the power supply would be the next likely candidate.  Mac Plus
> >   power supplies are designed to put out _exactly_ the amount of
> >   power required by a 1-Mb Mac.  The 256K simms draw less current
> >   than the 1-Mb simms that you've added.  There is an adjustment
> >   that is supposed to be made to the power supply (a trimmer
> >   somewhere on it) that can tweak the supply voltages to compensate
> >   for the extra draw of the SIMMS.  Outside of this, the only other
		.
		.
		.
>
>I have since removed the SIMMS and now have only 1meg again. The Mac 
>works fine. This would be in keeping with your theory about the
>Mac power supply. Anyone know where the trimmer is ??



	The Mac+ power board (the vertical one - in case you are not sure)
	should have a plastic cover between it and the case. On that, the
	various important places are printed.

	I think I remember it being about a third of the way up towards the
	front, labelled "- (hole here) +" something like that.

	My big question would be, where to stick the voltmeter to make sure
	that you are not over adjusting???

	I sort of did my by "feel" - I do not recommend this!!


	Also, where is that place that sells a kit with better rated Mac+
	parts (you know, the flyback transformer, some caps, etc...)??????

	I called them once and they seemed pretty cool, the kit was about
	$50 ?? (my memory may not working here)

	It may be my mind (again) but my Mac seems hotter after new SIMMS.
	Maybe now I'll get that fan for the Mac - a necessary part, or
	so I've heard.


	Joseph.T.Judge@ATT.COM
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Message-ID: <15368@cbnews.ATT.COM>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tut.cis.ohio-state.edu!att!cbnews!joe
References: <807@runxtsa.runx.oz.au>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tut.cis.ohio-state.edu!att!cbnews!joe
From: joe@cbnews.ATT.COM (Joseph Judge)
Newsgroups: comp.sys.mac
Subject: Re: MacPlus SIMM upgrade => crashes++
Keywords: SIMM, upgrade, crashes, power
Message-ID: <15368@cbnews.ATT.COM>
Date: 9 Apr 90 15:44:20 GMT
References: <807@runxtsa.runx.oz.au>
Reply-To: joe@cbnews.ATT.COM (Joseph Judge,45256,cb,1C393,6148607119)
Organization: AT&T Bell Laboratories
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