Shame you do not have a Hall effect probe to drag down the trace.
John WA4WDL
--------------------------------------------------
From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
Sent: Friday, March 23, 2012 4:58 PM
To: <time-nuts@febo.com>
Subject: Re: [time-nuts] Anyone familiar with SR-620 repair?
On 03/23/2012 09:30 PM, J. Forster wrote:
I should have added that you can get a pretty good idea of whick branch
on
a PCB is drawing current by probing along the trace. This is especially
useful if the rail has a bunch of branch distribution lines.
Also, if the three-terminal regulator is overheating, disconnect it and
power just that rail from an external, current limited supply of a volt
or
two. That way you don't risk trace damage.
I would toss the TDR on it just for the fun of it, but a miliohm
measurement should also help to locate it. Otherwise if there is no direct
evidence (hot cap or other chip) lifting legs of caps on speculation can
be a starter.
Cheers,
Magnus
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