K3: Loss of speaker audio after DSP board upgrade
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K3: Loss of speaker audio after DSP board upgrade
 
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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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: K3: Loss of speaker audio after DSP board upgrade
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I had the same experience and posted about it a few weeks ago. You must
be very careful to fully seat the pins into the plugs - all the way! A good hint is if the screw holes do not line up perfectly when you put the cover back together, you probably haven't seated the pins. It will look fine to the eye but if the pins are not pushed in to the max, you can lose audio. Buck k4ia K3 #101 In a message dated 6/28/2010 5:45:54 P.M. Eastern Daylight Time, [hidden email] writes: 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Stephen Prior
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 <[hidden email]> 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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