No speaker audio
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I recently discovered that my external speaker fails to work after
pulling out my headphones. I checked the resistance of the speaker and it reads 8 ohms, and the DC voltage across the plug (P5) is almost nothing. The DC voltage out of the audio amp U9 (Pin #6) reads 13 volts. R35/36 should be ok because the headphones work fine. I think J2 is the problem and could be called a TIF (toddler induced failure). My son was sitting on my lap listening to "beeping" and he tugged on the headphone cord. Could this have damaged the internal switch, keeping it stuck in headphone mode? Is there any way to fix this? 73, Kirk (KA2P) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I have the same fault here Kirk but not induced in the same way! Reading
previous comments it seems like early component failure. I think the only way to fix it is replacement. I am currently using an external powered speaker until I get round to requesting a new component. Chris G3SJJ Kirk Brown wrote: > I recently discovered that my external speaker fails to work after > pulling out my headphones. I checked the resistance of the speaker and > it reads 8 ohms, and the DC voltage across the plug (P5) is almost > nothing. The DC voltage out of the audio amp U9 (Pin #6) reads 13 > volts. R35/36 should be ok because the headphones work fine. > > I think J2 is the problem and could be called a TIF (toddler induced > failure). My son was sitting on my lap listening to "beeping" and he > tugged on the headphone cord. Could this have damaged the internal > switch, keeping it stuck in headphone mode? Is there any way to fix > this? > > 73, > > Kirk (KA2P) > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Kirk Brown-2
Hi Kirk,
Sounds like a bum audio jack. This should give you some insight: http://www3.ns.sympatico.ca/ppike/k2jack 73, Paul -ve1dy- On 1/12/07, Kirk Brown <[hidden email]> wrote: > I recently discovered that my external speaker fails to work after > pulling out my headphones. I checked the resistance of the speaker and > it reads 8 ohms, and the DC voltage across the plug (P5) is almost > nothing. The DC voltage out of the audio amp U9 (Pin #6) reads 13 > volts. R35/36 should be ok because the headphones work fine. > > I think J2 is the problem and could be called a TIF (toddler induced > failure). My son was sitting on my lap listening to "beeping" and he > tugged on the headphone cord. Could this have damaged the internal > switch, keeping it stuck in headphone mode? Is there any way to fix > this? > > 73, > > Kirk (KA2P) > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > -- Paul - ve1dy - Halifax, NS QRP-L #416, SKCC #91 K2 - 5678 www3.ns.sympatico.ca/ppike _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: No speaker audio
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In reply to this post by Kirk Brown-2
Kirk,
Sounds as though the internal switch in your headphone jack has failed, and the only practical fix I believe is to replace it. Since 2003 the switch in the original headphone jack and its replacement in my K2 have failed, and I now use a robust headphone jack mounted on the rear panel. 73, Geoff GM4ESD ----- Original Message ----- From: "Kirk Brown" <[hidden email]> To: <[hidden email]> Sent: Saturday, January 13, 2007 12:17 AM Subject: [Elecraft] No speaker audio >I recently discovered that my external speaker fails to work after > pulling out my headphones. I checked the resistance of the speaker and > it reads 8 ohms, and the DC voltage across the plug (P5) is almost > nothing. The DC voltage out of the audio amp U9 (Pin #6) reads 13 > volts. R35/36 should be ok because the headphones work fine. > > I think J2 is the problem and could be called a TIF (toddler induced > failure). My son was sitting on my lap listening to "beeping" and he > tugged on the headphone cord. Could this have damaged the internal > switch, keeping it stuck in headphone mode? Is there any way to fix > this? > > 73, > > Kirk (KA2P) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Add me to the list of K2 owners with a headphone jack problem. Knowing
of the propensity of these to fail, I was careful not to place side pressure on the connector, but nonetheless, it failed recently, with the usual failure mode -- no speaker audio, headphone audio only. Jack K8ZOA > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Geoffrey Mackenzie-Kennedy-2
Any pics of how you mounted and wired it or the part number and vendor
of the part you got to replace it? I'm planning a K2 build soon as I sell some radios. So I was trying to get the pieces in place from the start. David Wilburn [hidden email] K4DGW Geoffrey Mackenzie-Kennedy wrote: > Kirk, > > Sounds as though the internal switch in your headphone jack has failed, > and the only practical fix I believe is to replace it. Since 2003 the > switch in the original headphone jack and its replacement in my K2 have > failed, and I now use a robust headphone jack mounted on the rear panel. > > 73, > Geoff > GM4ESD > > ----- Original Message ----- From: "Kirk Brown" <[hidden email]> > To: <[hidden email]> > Sent: Saturday, January 13, 2007 12:17 AM > Subject: [Elecraft] No speaker audio > > >> I recently discovered that my external speaker fails to work after >> pulling out my headphones. I checked the resistance of the speaker and >> it reads 8 ohms, and the DC voltage across the plug (P5) is almost >> nothing. The DC voltage out of the audio amp U9 (Pin #6) reads 13 >> volts. R35/36 should be ok because the headphones work fine. >> >> I think J2 is the problem and could be called a TIF (toddler induced >> failure). My son was sitting on my lap listening to "beeping" and he >> tugged on the headphone cord. Could this have damaged the internal >> switch, keeping it stuck in headphone mode? Is there any way to fix >> this? >> >> 73, >> >> Kirk (KA2P) > > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: No speaker audio
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David,
I am using a 3.5 mm jack / switch made by Schuter www.schuter.com , their part number 4302 - 2310 which is the insulated version. I happened to have a spare new one which I had purchased in Luxembourg, but I believe that Digikey carry many of Schuter's items. Apart from being more robust than the existing headphone jack, the internal switches are more versatile there being one switch on each of the ring, tip and sleeve 'connections'. Schuter sells a plug designed to mate with this connector, but as yet I have had no problems when I have had to use a 'standard' 3.5mm stereo plug. Sorry no pics, but I mounted the jack on the rear panel of the K2 as high as possible above relay K1 (on RF Board). Although this is perhaps not the best place for the new jack I did not want to get too close to the Tx driver and PA to avoid possible RF problems of various types. Having said that my KPA100 just above has not caused any visible problems. I dispensed with R35, R36, C105 and C106 and used a length of small diameter 2 conductor sreened pair to bring the audio 'Hi' and 'Lo' to the new jack. This 'cable' lives high up on and fixed to the inside of the K2's left hand side panel. To use the internal speaker you would want at least one extra wire in the connecting 'cable' to go back from the new jack to the speaker circuit trace near the existing headphone jack. I would not use the screen for the audio 'Lo'. If I was going to do it again I just might put the new jack near the K2's antenna jack and bring the audio from the area of P5 on the right hand side of the K2. Since putting in the new jack I have found that any additional objects 'seen' by the Reference oscillator, VCO and BFO on the left can result in additional problems with receiver birdies and Tx spurs, including the notorious 7183 kHz flutter. To do this would require a permanent short between the junction of R35 / R36 and the speaker track going off to P5, cutting this track close to P5 for connection to the new headphone jack, with the returning speaker circuit connected to P5. I hope that this is useful. 73, Geoff GM4ESD ----- Original Message ----- From: "David Wilburn" <[hidden email]> To: "Geoffrey Mackenzie-Kennedy" <[hidden email]> Cc: "Kirk Brown" <[hidden email]>; "Elecraft Discussion List" <[hidden email]> Sent: Saturday, January 13, 2007 1:39 PM Subject: Re: [Elecraft] No speaker audio > Any pics of how you mounted and wired it or the part number and vendor of > the part you got to replace it? I'm planning a K2 build soon as I sell > some radios. So I was trying to get the pieces in place from the start. > > David Wilburn > [hidden email] > K4DGW > > > > Geoffrey Mackenzie-Kennedy wrote: >> Kirk, >> >> Sounds as though the internal switch in your headphone jack has failed, >> and the only practical fix I believe is to replace it. Since 2003 the >> switch in the original headphone jack and its replacement in my K2 have >> failed, and I now use a robust headphone jack mounted on the rear panel. >> >> 73, >> Geoff >> GM4ESD _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: No speaker audio- OOPS
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Typing error, the name of the company is Schurter www.schurter.com not
Schuter. My apology. 73, Geoff GM4ESD ----- Original Message ----- From: "Geoffrey Mackenzie-Kennedy" <[hidden email]> To: "David Wilburn" <[hidden email]> Cc: "Elecraft Discussion List" <[hidden email]> Sent: Saturday, January 13, 2007 5:17 PM Subject: Re: [Elecraft] No speaker audio > David, > > I am using a 3.5 mm jack / switch made by Schuter www.schuter.com , their > part number 4302 - 2310 which is the insulated version. <snip> _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Jack Smith-6
Are these headphone jacks failing internally, or are pins being damaged due to
the stress on the PC board. I suspect it is the former, from the discussions, but I did wonder why there is no stress relief on the connectors that exit the front panel. 73, Tom KG3V Quoting Jack Smith <[hidden email]>: > Add me to the list of K2 owners with a headphone jack problem. Knowing > of the propensity of these to fail, I was careful not to place side > pressure on the connector, but nonetheless, it failed recently, with the > usual failure mode -- no speaker audio, headphone audio only. > > Jack K8ZOA > > > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: No speaker audio
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Both the original and replacement headphone jacks of my K2 failed
internally, I am reasonably certain that the cause was external. 73, Geoff GM4ESD ----- Original Message ----- From: "Tom Zeltwanger" <[hidden email]> To: "Jack Smith" <[hidden email]> Cc: "Elecraft Discussion List" <[hidden email]> Sent: Tuesday, January 16, 2007 12:10 AM Subject: Re: [Elecraft] No speaker audio > Are these headphone jacks failing internally, or are pins being damaged > due to > the stress on the PC board. I suspect it is the former, from the > discussions, > but I did wonder why there is no stress relief on the connectors that exit > the > front panel. > > 73, > > Tom KG3V _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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