[Elecraft] K2 Keypad

[Michael Carter]

Hi again, Bill,

I re-read your post and realized that
it's only the buttons to the right side
of the LCD display that fail to function
(with the exception of the MODE button).
Is that correct?

If so, I will retract my statement about
the parallel load shift register not working
properly.  If it works for the buttons to the
left of the LCD display, then the shift
register is working OK.  It would then
seem that the BANK2 switches to the
right of the display are not being polled.
The /BANK2 signal that polls these
switches is generated in U3, a 6B595
shift register.  That shift register
receives data serially from the MCU
and produces the /BANK1 and /BANK2
signals that activate each switch
bank in turn.  U3 also generates the
/ENC_RD signal that allows the
main tuning knob to be read.

Please confirm which controls do
register any response, including
the 4 potentiometers to the
left of tuning knob.

Thanks, and 73,
Mike, K8CN