I also have a 5680A with that strange little board. On a hunch, I
disconnected the orange wire and injected a DC voltage into the main
board. It caused the frequency to change. I don't know if it's the
C-field control or another mechanism, but the result is the same.
Ed
On 2/23/2014 4:01 PM, Simon Lyons wrote:
OK ... I have C245 on the middle board, same as you. Tweaking it and ...
Hmmm, it does affect the range (twitchy is an understatement!) but
still no lock. To be continued....
Now by the 'frequency control board' do you mean the board that
overlaps the top of the D-Sub connector? I have been at a loss to
understand this section. There is all sorts of silicon on it but no
inputs of any kind. Just a 5V supply and a single analog output of
1.99V on the orange wire. I'm baffled, so if you know what this board
is doing, please tell!
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