[time-nuts] Anyone familiar with SR-620 repair?

jmfranke jmfranke at cox.net
Fri Mar 23 21:03:47 UTC 2012


Shame you do not have a Hall effect probe to drag down the trace.

John  WA4WDL

--------------------------------------------------
From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
Sent: Friday, March 23, 2012 4:58 PM
To: <time-nuts at 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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