[Elecraft] K3: Loss of speaker audio after DSP board upgrade

[Guy Olinger K2AV]

If it's still working...

Sometimes those pins get a "sheen" of something or another, and will
not make a good contact until they have been seated and reseated some
number of times.  Some people use De-oxit or the like on the pins
before insertion.

73, Guy.

On Mon, Jun 28, 2010 at 5:45 PM, Stephen  Prior <sjp at sjprior.fsnet.co.uk> wrote:
> I received the upgrade DSP board today.  Swapping over the boards was very
> straightforward, but on switching on the K3 I found I had no sound from the
> built-in speaker (headphone audio was fine) unless I had the config option
> set to run with headphones and speaker simultaneously. Therefore neither the
> connection to the loudspeaker connection or the speaker itself are at fault.
> No output from the rear speaker socket either.
>
> I took it all apart and re-installed.  I could see no misalignment of
> headers anywhere, nothing in fact which was in any way obviously a fault.
> Put it back together again.  Problem still there.  Then I re-installed my
> original DSP board (fortunately I had not been too hasty in returning it to
> Elecraft!) and everything was fine.
>
> Having assured myself that this was not a wider issue, I installed the
> upgraded DSP board for the third time.  Now the speaker worked, but flexing
> the DSP board slightly (with the left hand side cover removed) could make
> the fault come and go.  Out came the new board again to check for dry
> joints, cracked tracks, shorting metal bushes etc.  I could see nothing
> wrong, although I know that hairline cracks are not easy to spot.
>
> I put the new board back in for the fourth time and now the K3's speaker
> seems to be reliable again.  I had looked at the mating of the pins, looked
> to see whether there was any dirt there etc., all to no avail.  I would like
> to think that I have somehow sorted the problem but have a sneaking
> suspicion that it might come back to haunt me!
>
> On the topic of the replacement board itself, I can see very little
> difference between it and the Rev B board it replaced, however there is an
> extra IC compared with my previous board. I was expecting a piggy-backed
> board somewhere, but perhaps I have got the wrong impression from reading
> this list about what has changed.  The audio is certainly fuller and easier
> on the ear.
>
>
> 73 Stephen G4SJP
>
> K3 #980
>
>
>
>
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