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From: jws@cica4.mlb.semi.harris.com (James W. Swonger)
Newsgroups: sci.electronics
Subject: Re: power supply
Message-ID: <1991Feb4.140322.16960@mlb.semi.harris.com>
Date: 4 Feb 91 14:03:22 GMT
References: <342@aldetec.oz.au>
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 First off, look at the power transformer and see if you're lucky enough to
have the primary labeled. If so you can trace the lines back to the connector.
If not, the primary will probably at least have the winding taps in a
sensible order, so if you have 3 leads the center is the center tap. This
can be verified by measuring resistance from the leftmost lead across. The
resistance increasing monotonically means the reasonable-man theory is in
effect. For 230V you will want the full primary (the highest possible
resistance combination). Find that on the xfmr and trace back to the
connector.