http://elecraft.85.s1.nabble.com/K2-Alignment-and-Test-Part-II-issues-tp7645364p7645377.html
Yes you might have a PLL problem, but that is not certain yet. One quick
>
> Don,
>
> Thank you for the excellent advice! I went to the bottom of the board
> and checked the resistance between the ends of RFC16. It was infinite,
> so I rewound RFC16 and ensured the leads were cleaned good. After
> reinstalling, I now have 4.~ votes at U6 pin 5, and 8.~ at pin 8. Pin
> 8 of the Thermistor Board has 8.~ volts, too.
>
> Now, when I select CAL FCTR and enable the frequency counter, the
> counter shows 00000.00. I believe this tells me there is a problem
> with the PLL Reference Oscillator. I will continue to look at those
> components. Any other suggestions?
>
> Thanks!
>
> Don, KE0PVQ
>
> Sent from Mail <
https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
> *From: *Don Wilhelm <mailto:
[hidden email]>
> *Sent: *Thursday, September 27, 2018 1:34 PM
> *To: *Don Schroder <mailto:
[hidden email]>;
>
[hidden email] <mailto:
[hidden email]>
> *Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues
>
> Don,
>
> You apparently have a problem with the thermistor board - or the 8 volts
>
> to it.
>
> A "voltage rail" are those PC traces that carry voltage to various parts
>
> of the circuit.
>
> In the K2, there is one for 12 volts, another for 8 volts and another
>
> for 5 volts.
>
> On the schematic they are labeled "12V", "8A" and "5V" respectively.
>
> The main 8 volt and 5 volt regulators are on the Control Board. You will
>
> find an "5B" voltage rail at the output of U8 on the RF Board and the
>
> "8B" voltage is sourced at the output side of RFC16.
>
> If you do not have 8 volts at the thermistor board pin 8, then
>
> investigate the stripping and tinning of the RFC16 leads.
>
> Once you have 8 volts at the thermistor board (RP3 position) pin 8, then
>
> recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.
>
> 73,
>
> Don W3FPR
>
>