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Kenwood TM-261 no audio

Discussion in 'Radio Circuits, Repair & Performance' started by N1EBC, Nov 6, 2019.

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  1. N1EBC

    N1EBC Ham Member QRZ Page

    I have a TM-261 that I can no longer hear anything on? Even with Squelch all the way down I can hear no static or anything. External speaker is the same.
    If it's a problem with mic should I be able to hear anything with the mic disconnected?

    Thanks,
    N1EBC
     
  2. KA5IPF

    KA5IPF Ham Member QRZ Page

    What does the s-meter show? If nothing it's probably a pll unlock situation.
     
  3. N1EBC

    N1EBC Ham Member QRZ Page

    Smeter appears to work. When I move squelch it will show busy suggesting a signal rotate squelch other way busy dissappears. i can transmit and using a scanner hear my transmission and others respond to me through scanner.
    If it's the mic should I hear tranmissions with it disconnected? Because I don't when it's disconnected, is there and audio chip in this radio?

    N1EBC
     
  4. KA5IPF

    KA5IPF Ham Member QRZ Page

    If the s-meter shows a signal when hams are responding to you then it's receiving. Most likely cause is the Ext Spkr jack. If it breaks there is no audio. Do you have the service manual to trace it out?
     
  5. N1EBC

    N1EBC Ham Member QRZ Page

    Yes, will check it out when I get back from Michigan. Thanks,
    N1EBC
     
  6. WA9SVD

    WA9SVD Ham Member QRZ Page

    I KNOW it is too simple, but have you tried (with or without "DeOxit") plugging the module in and out (gently) a few times? It may be simply an oxidized or corrosion problem.
     
  7. N1EBC

    N1EBC Ham Member QRZ Page

    I just took it out of the aston power supply mount will let you know this afternoon.

    Thanks,
    Jason
    N1EBC
     
  8. N1EBC

    N1EBC Ham Member QRZ Page

    ok I shot some deoxit in there and worked the external speaker in / out now the external speaker works and made a few contacts on the repeater.
    But internal speaker not working at all.

    Jason
    N1EBC
     
  9. KC8QVO

    KC8QVO Ham Member QRZ Page

    The speaker jacks are double acting. There is a pin in there that shorts out with no speaker connected. This is what routes audio to the internal speaker. If that is not shorting out you will get no audio.

    When you plug the external speaker in you are making contact with the jack pins = you are completing the circuit with the external speaker = you hear audio.

    I had a radio that had this same issue. I bent a welding rod (like a metal coat hanger size) with a hook on the end and was able to fit it inside the speaker jack (with the cover off the radio - reaching down through one of the side openings in the jack box). I was able to bend the pin so it would work with the external speaker, however without replacing the jack I can't get the internal speaker to work correctly. I could solder a jumper in if I wanted the internal speaker that bad without replacing the jack...
     

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