Kenwood TS-940S keypad frequency entry problem.

Discussion in 'General Technical Questions and Answers' started by N8EBN, Mar 13, 2013.

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  1. N8EBN

    N8EBN Ham Member

    When entering the frequency digits using the keypad, they show up in the main display as entered. However, when I then hit the ent(er) key, the display and VFO reverts to the previous frequency that was in use. Where should I start looking? I have replaced all batteries.
    Thanks,
    Ron, N8EBN
     
  2. W9GB

    W9GB Ham Member

  3. N8EBN

    N8EBN Ham Member

    Thank you for the links. I read through all the entries in the bible but found no discussion of this particular problem.
     
  4. KE3WD

    KE3WD Ham Member

    Check out the memory cell battery, it is likely depleted.


    73
     
  5. W9GB

    W9GB Ham Member

    Problem same before battery replacement?
    http://www.beevo.com/TS940 Battery Replacement.html

    The TS-940S has TWO lithium coin cells, CR2430 with solder tabs. You changed both?
    Did you observe correct polarity?

    Potential lithium coin cell replacements w/tabs (~ $2)

    Digi-Key
    P025-ND : BR2330A/FAN
    P654-ND : BR2330/F3N
    P657-ND : CR2032/F2N

    =
    INTERIOR PHOTOS of TS-940S
    http://www.beevo.com/Kenwood TS940 Images.html
     
    Last edited: Mar 14, 2013
  6. N8EBN

    N8EBN Ham Member

    Yes, I have replaced all three batteries, the two behind the sub-display, and the one under the speaker base.
     
  7. N8EBN

    N8EBN Ham Member

    Yes, the problem was the same before the battery change. I assumed it was a battery problem but I guess it wasn't. I also replaced both batteries behind the sub-display, and the one under the speaker base plate. Correct polarity was diligently observed.
     
  8. ND6M

    ND6M Ham Member

    940's are famous for developing bad connections,... try to disconnect and reseat all internal elect connectors.

    be careful
     
  9. K8JD

    K8JD Ham Member

    TS440s keypad troubles

    I had problems with the keypad entering multiple # s or nothing on my TS440s.
    Tap the 5 key and 5555 appeared on the display, tap 6 and nothing appeared, etc....After many attempts it started working better,.
    I played with the key entry a few times when I first got my used 440 and ignored it for ten years, until 60M opened up.
    I wanted to program the 60M frequencies when CW was allowed and it took me hours to get the 10 channel frequencies entered.
    May be disuse let the key contacts oxidize up ??
    Now when I want to get on 60M I just hit the MEM/VFO button and go.
     
    Last edited: Mar 15, 2013
  10. N8EBN

    N8EBN Ham Member

    Thanks. I'll try that next.
     
  11. W9GB

    W9GB Ham Member

    Ron -

    IF you determine that the problem is the keypad itself, then the appropriate repair will depend on the technology used. Clif Holland at Avvid would be helpful here, since I have never seen this issue in my radios.

    Membrane keypads and rubber keypads used in a variety of electronics, have had issues.
    Hence the repair approaches, below.

    Black carbon keypads
    http://www.keypadrepair.com/

    Membrane keypads
    http://www.p1repair.com/membrane_keypad.htm
     
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