[Elecraft] K2 trouble shooting

[Mike-WE0H]

Hi Don,

Ref K2 #6698:

I tried a new encoder but it did nothing different than the original 
encoder. Tonight I see that ENC-A is only 2v p-p while ENC-B is 5v p-p. 
This is measured right on the encoder terminals and on the U6 MCU chip. 
I don't see any resistor network pull ups on these lines. Do you think 
the MCU could have gotten hurt with the spike on the 14v VCC line that 
shorted the one final and that VCC filter cap? I see data on both ENC 
lines when I spin the encoder. The Encoder VCC is a solid 5.0vdc. All 
other functions work on this radio except anything where I need to turn 
the encoder to access something in a menu or change anything. The radio 
receives fine on whatever the display freq is and transmits fine on the 
same freq on all bands. I just can't change any VFO digit other than the 
far right digit, or if I spin the encoder shaft left & right, it will 
slowly increase the displayed freq but not go down.

Mike
WE0H