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

[J. Forster]

Hi Magnus,

I very much doubt you could get anything useful out of a TDR. There is no
reason I can think of that a power rail should look anything like a
transmission line and the rail should be an AC short every inch or so.

FWIW,

-John

============


> 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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