[time-nuts] HP-5335A Fail Code
Magnus Danielson
magnus at rubidium.dyndns.org
Sun Mar 27 23:59:29 UTC 2011
On 03/27/2011 11:56 PM, Gordon Batey wrote:
> Thanks for your interest Magnus. I am entering the diagnostic
>
> start codes as you mentioned at the bottom of your email but all
>
> I get are a series of seemingly random numbers.
>
> I do have a second similar counter to refer to, so that helps.
>
> The manual seems to indicate that the problem may be in the
>
> MRC or A4U7. Not I need to see how to see which one.
Hope for the A4U7, as it is much more likely to be replaceable.
Also consider that the MRC (A4U6) is sitting in a IC holder, so oxide on
any of the data bus pins for instance would help to distort the picture.
Signature analysis is what I would attempt here. Not many have those
toys these days. I recently got one from a clean-up, and realized what
it was. :)
Cheers,
Magnus
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