[Elecraft] K2 VCO Alignment - Low voltage

[Mark Yergin]

U6 Pin 5 = 4.1v

PLL ref Osc range at TP3 = 12098.83 to 12084.95

VFO at TP1:
@4000kHz = 8077.0
@7100kHz = 11288.5

Mark

On Sun, Apr 21, 2019 at 6:02 PM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Mark,
>
> First check the DC voltage on U6 pin 5.  It should be near 4 volts - if
> not, you have a problem on the thermistor board, likely a solder bridge.
>
> Then recheck the PLL reference oscillator range at TP3 using CAL FCTR.
> Tell me the high and low frequencies.
>
> Then check the VFO frequency at TP1 (using CAL FCTR) when tuned to
> 4000kHz and again when tuned to 7100kHz.
>
> 73,
> Don W3FPR
>
> On 4/21/2019 1:43 PM, Mark Yergin wrote:
> > I'm getting 0.02 V at R30, not 6V.  Turns on T5 correct and wound per
> > image.  Reflowed the four solder joints and verified continuity between 1
> > and 2, 3 and 4. C72 is correct value (label 271) and reflowed.  L30 is
> the
> > correct value (large slot), and reflowed.  D21-26 confirmed as correct
> > values.  C71-74 confirmed as correct values.
>