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 <[email protected]> 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 > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
