K2 intermittend key failure

[oe9fwv]

After solving the 40/80m KPA100 overdrive problem with the help and good
advice of Don Wilhelm I come back with a new one:
This weekend I had a intermittend key failure of the menu key and the PF2
key on my K2.  All other keys worked.
Switch on / off did not help, but a little clap (like the claps I got as a naughty
child) on top of the K2 immediately turned things to normal.
I suspect a bad soldering somewhere on the display unit. If the failure comes
back, where should I start to look / resolder? I think it is not the key itself, but
elsewhere...

73! de Werner
OE9FWV

--  
 Consciousness: That annoying time between naps.



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[Don Wilhelm-4]

Werner,

If no other pushbuttons fail at the same time, the most likely is
soldering at the switch itself (or a bad switch, which is rare, but
could happen).  The pushbuttons are arranged in a matrix.  If there is a
failure in the sensing circuits, the entire horizontal row or the entire
vertical row would fail.
You could try refreshing the solder connections from the back of the
front panel board, but replacing the switch requires removing the FP
board from the front panel metalwork - the hardest part of that is
removing the knobs, not a daunting task, but more of a bother.

73,
Don W3FPR

Dr. Werner Furlan wrote:

> After solving the 40/80m KPA100 overdrive problem with the help and good
> advice of Don Wilhelm I come back with a new one:
> This weekend I had a intermittend key failure of the menu key and the PF2
> key on my K2.  All other keys worked.
> Switch on / off did not help, but a little clap (like the claps I got as a naughty
> child) on top of the K2 immediately turned things to normal.
> I suspect a bad soldering somewhere on the display unit. If the failure comes
> back, where should I start to look / resolder? I think it is not the key itself, but
> elsewhere...
>
> 73! de Werner
> OE9FWV
>
> --  
>  Consciousness: That annoying time between naps.
>
>
>
> PGP-Key: <http://www.qsl.net/oe9fwv/furlan.asc>
> Fone [phone]
> Fax [phone]
> Mobile      [phone]
>
>
> _______________________________________________
> 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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