Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!werner
From: werner@cs.utexas.edu (Werner Uhrig)
Newsgroups: comp.sys.mac.misc
Subject: Re: Help!, my analog board is shot
Keywords: analog board, transformer, plus
Message-ID: <1326@hedora.cs.utexas.edu>
Date: 12 Jul 90 20:25:43 GMT
References: <1990Jul11.194216.1939@cbnewsk.att.com> <3838@adobe.UUCP>
Organization: U. Texas CS Dept., Austin, Texas
Lines: 23


>  There should be a label that says "Voltage Adjust" or
> something similar that is right by a trim pot.  Get out a screw driver and
> turn this until the machine boots (you might want to mark its original
> position first).

	do NOT use a (metall-)screw-driver!

	Radio-Shock sells a color-TV plastic tools set for $3 ($2 on sale) 
	or you can use a home-made gizzmo with a flat end made of plastic
	or wood (I've used cherry sticks, those wooded sticks girls use
	to do their nails ...:-)

	you also should not do this without a voltmeter attached somewhere
	(the goal is to adjust the 5-volt-level as exact as possible;
	ignore the 12-volt level completely) like a DB-9 port, pins
	2, which has 5v and 1 or 3, which is ground (I know this is not
	the best place to get exact readings, but, hey, I'd like my
	neophyte net-friends to be around a while longer ... :-)

	pin 6 and 7 of the cable linking the analog with the motherboard
	also have 5 volts and ground .... (there.  kill yourself or your
	motherboard  :-)