Don,
The voltage is likely coming through RP2 and making its way through
L31. That is not the problem.
If you want to verify that it is that path, read it while rotating the
VFO through a 10 or 12 kHz range. It should vary.
When the crystal oscillates, you should obtain a frequency at TP3. That
is your next challenge.
As I said in the last email, measure the resistance at the source of
Q19. It should be near 270 ohms.
73,
Don W3FPR
On 9/29/2018 4:02 PM, Don Schroder wrote:
Hi Don,
I finally got some time to check your suggestions. D18 is oriented
properly, and it looks like C84 & C85 are marked 121 (kind of hard to
read since they are installed). So I thought I would check voltages
for the PLL Reference Oscillator circuit. Didn’t take long to find 7.5
volts going into X1 (the crystal) and 0 volts coming out! I resoldered
the pins to ensure no cold joints, and still 0 volts coming out. Do
crystals go bad, or is it possible I burned it up by too much heat on
the casing when grounding it? I think I will need a new one before I
can check the BFO.
Thanks!
Don, KE0PVQ
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