John,
Yes, that would strongly indicate that D3 is faulty. It is good that
you confirmed RIT does change the frequency.
I don't think you will find one locally, but an email to
pa...@elecraft.com should bring you one quickly in the mail.
Since a bad D3 is a rarity, you might also want to check for board
continuity with your DMM. Check to see that you have the same voltage
variation on one lead of C2 - that will confirm that D3 is connected to
C2. The other lead of C2 cannot be tested with voltage, so use your
ohmmeter to check for continuity between the other lead of C2 and L1.
Should you find the board has an open trace (also a real rarity), repair
it with a wire. Elecraft would send you a new board, but you already
have enough work in that board to warrant repairing it with a wire.
73,
Don W3FPR
On 2/24/2013 3:27 PM, John Reed, W8DE wrote:
Don,
C2 and D3 look to be properly installed. I confirmed orientation from a 1SV149
data sheet just in case I mis-read the instructions.
I can adjust receive frequency with RIT, so it looks like the D4 control is
working.
Since the D3 voltage is varying from 0v to 5.888v with the tuning pot, but
there is no change in frequency, I'm starting to suspect a bad D3. I don't
know of anyway to check it in circuit -- at least with the tools I have. I'll
see if I can pick up a 1SV149 locally. I considered swapping it with D6, but I
don't think I can remove it without damaging it.
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