No audio from P5
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Hi,
My K2 (#4979) worked just fine untill yesterday. After setting L34 for the best signal-to-noise ratio and placing the top cover back onto the chassis I found, all of a sudden, that there were no audio from the internal speaker. And there were no sound from the external speaker jack either. Now I have only audio from the headphone jack. All worked well before. What can possibly have gone wrong? Rolf SM0YQC K2 QRP, KSB2, KDSP2 and K160RX _______________________________________________ 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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Rolf,
It sounds to me like you have a malfunctioning connector - likely the one on the end of the speaker cable. If the terminals were malformed during the assembly process, they are high on the list of suspects. It is also possible that the headphone jack has failed - the contact that provides the path for the speaker audio - you should be able to confirm (or deny) that condition with a continuity check directly across the solder pads of the headphone jack. Along the same lines, and since your K2 is relatively new, you may try re-flowing the solder joints for the headphone jack. The pins barely stick through the board and if insufficient heat is supplied to the pin a poor solder connection can result (even if it looks good on the surface). If you have a meter that will respond to audio (AC) voltage, try measuring the voltage at RF Board P5 directly - if you have AC voltage there, the problem is in the speaker connector or wire. You can check the wire with an ohmmeter. 73, Don W3FPR > -----Original Message----- > > Hi, > > My K2 (#4979) worked just fine untill yesterday. After setting L34 for > the best > signal-to-noise ratio and placing the top cover back onto the chassis I > found, all > of a sudden, that there were no audio from the internal speaker. And > there were > no sound from the external speaker jack either. Now I have only audio > from the > headphone jack. All worked well before. What can possibly have gone wrong? > > Rolf SM0YQC > > K2 QRP, KSB2, KDSP2 and K160RX > No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.13/78 - Release Date: 8/19/2005 _______________________________________________ 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 Rolf-8
Rolf, SM0YQC asked:
"...placing the top cover back onto the chassis I found, all of a sudden, that there were no audio from the internal speaker. And there were no sound from the external speaker jack either. Now I have only audio from the headphone jack. All worked well before. What can possibly have gone wrong? -------------------------------------------- Personally, I find that such failures are ALWAYS something I touched. As much as I really, really want to believe that something unrelated failed by coincidence, I don't think I've ever found that to be the case, Hi! In this situation, the problem should be in the cable from the speaker to the jack on the main PC board. Forgive my asking the obvious but: 1) Did you reconnect the plug to the main pc board when you install the top? 2) Is the connector oriented correctly. It is possible to get it backwards if the tab on the connector has been bent. Inserted backwards, it shorts out the audio line to the speaker. 3) Did one of the speaker wires break, either at the connector or elsewhere on the top cover where it moved as you handled it? Ron AC7AC _______________________________________________ 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 Rolf-8
The 1st time this happened to me it was because I plugged into the wrong P5!
on the control board. Didn't see the one on the RF board. But that's the kind of bone head guy I am. Ask the list, I needed lots of help. hi hi Okay, I got past that, but after only two contacts, indeed my head phone jack went out. When I brought it up on the list, it looks like a common problem and a weak spot with the k2. Now like one list member said, "I hold my breath everytime I pull my headphone jack out". But then, looks like elecraft is willing to replace it at least until they can come up with a replacement. There's just not anything in between the headphone jack and the speaker. You might try hooking the speaker up via alligator clips to a radio or something to eliminate that possibility that something came un-soldered. Roland in Stockton k2 #3090 ----- Original Message ----- From: "Rolf" <[hidden email]> To: <[hidden email]> Sent: Sunday, August 21, 2005 4:52 AM Subject: [Elecraft] No audio from P5 > Hi, > > My K2 (#4979) worked just fine untill yesterday. After setting L34 for the > best > signal-to-noise ratio and placing the top cover back onto the chassis I > found, all > of a sudden, that there were no audio from the internal speaker. And there > were > no sound from the external speaker jack either. Now I have only audio from > the > headphone jack. All worked well before. What can possibly have gone wrong? > > Rolf SM0YQC > > K2 QRP, KSB2, KDSP2 and K160RX > _______________________________________________ > 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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