[Kenwood] TS-440S/AT Keyboard Problem

Mon, 05 Apr 2004 22:48:54 -0300

    Hello Bill, you are right, it's a key bounce problem. Some people 
say it's due to a smoker's environment, others state that it has a 
greater chance to happen with little use, so using all keys frequently 
prevents this problem; the contacts below are made with a sort of 
rounded spring metal, which make contact with two circuit board pads 
with pressure. These springs are all located below an adhesive foil (I 
think some times if the foil adhesive vapour that may show with thermal 
cycles did not corrode the contacts); keep track also of the numerous 
tiny screws which fix in place the board.
I twice tried to clean them,with good success in one rig and in the 
other a little better only; it's a difficult task also to clean them 
wihout loosing any single one (they like to jump, as happened to me), so 
hold it tightly when cleaning; I did the job with a soft non metallic 
brush turning at few revolutions with my Dremel.
After that, be patient to re-locate them in place and after this to 
locate the adhesive foil.

Hope this helps
Good luck
Guillermo - LU8EYW.

Bill Smith escribi�:

>I have a TS-440SAT that has been in operation since 1998 or so, and it has
>developed a keyboard problem.  Function keys (LSB/USB/CW etc.) work
>normally, but use of the same physical keys to enter frequency result in
>multiple digits with every keystroke.  Looks in every way like keyboard
>bounce.
>
>Any ideas?
>
>73 de Bill, AB6MT
>[email protected]
>
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