Many thanks to those of you who commented on my K3 problem, which was that
the front panel button functions were "scrambled." You've all correctly
identified the problem as being a stuck pushbutton on one of the rotary
encoders. The front panel buttons tap onto a voltage divider chain, whose
voltage is read by an A to D convertor that tells the microprocessor which
button is pressed. If one button is stuck, it messes up all the buttons
because the divider chain for the other buttons is then wrong. (In effect,
each button is then sitting on a wrong rung of the ladder).
In my case, repeatedly pushing the errant button caused it to start working
again, at least temporarily. If the problem recurs, which I suspect is
likely, I'll have to send the front panel back to Elecraft, since I'm told
swapping the encoder is not an easy job. Dale at Elecraft told me this
problem tends to occur with encoders that aren't used frequently. That was
my situation, since the problem encoder controlled the CW keyer speed and I
use an external keyer.
73,
Jim W8ZR
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