[time-nuts] Anyone familiar with SR-620 repair?
J. Forster
jfor at quikus.com
Fri Mar 23 22:21:19 UTC 2012
Most instrument PCBs have scores of bypass caps... all in parallel.
-John
=========
> Shouldn't be too bad, a 10uF cap would have 15 Ohms impedance at 1KHz,
> 150
> Ohms at 100Hz, and one could inject at different places on the trace...
> away from the big bypass caps.
>
> Doing the same with DC and a simple multimeter should work too.
>
> bye,
> Said
>
>
> In a message dated 3/23/2012 14:31:42 Pacific Daylight Time,
> jfor at quikus.com writes:
>
>> Here is a trick or two that may work:
>>
>> feed a very small AC voltage with say 1KHz and 10mV into the bad power
>> rail. It won't hurt anything.
>>
>> Then use an old cassette players' magnetic pickup and amplifier to
> follow
>> the signal to the short. No need for expensive hall effect meters.
>
> Good bypass caps are near AC shorts. I've not tried it, but am not
> optomistic. It would work on stuck signals lines, but not well on power,
> IMO.
>
>
>
More information about the Time-nuts_lists.febo.com
mailing list