[Elecraft] K2 PLL range test fails

[Mike Maiorana]

Since fixing my BFO range issue I started going through a full alignment. I
roughly set the BFO for all the filters. I noticed my frequency display was
off about 1500 Hz, so I re-set the 4MHz oscillator, then tried to run CAL
PLL. The CAL PLL started, but never finished. It just sat right around
12.1MHz.

I went back and tried the "PLL Reference Oscillator Range Test", which had
passed the first time I went through calibration. Now, it is "stuck" on
12.097MHz. What is strange is that it will jump briefly when I press Band+
and Band-, but it settles back to 12.097MHz.

I put a volt meter on pin 1 of U6 on the RF board to check the control
voltage. When I press Band- I can see the voltage briefly drop to near
zero. When I press Band+ it jumps to 7.5V or so, then goes back to the
original value.

If I rotate the VFO knob I can see the PLL frequency and the control
voltage vary over a range of about 5kHz on the VFO.

It seems that the PLL is moving with the control voltage, but the Band+ and
Band- keys during Cal FCTR don't seem to be doing what they should. Is it
possible that I fouled up another part of the calibration that is causing
this weird behavior? It sure feels like I'm doing something wrong, but I
can't figure it out.

I did a factory reset (hold 4,5,6 and power on), but I'm still seeing the
same issue with the PLL.

Any help will be greatly appreciated.

Thanks and 73
Mike M.
KU4QO