Steve,
Thank you for the info on how you accessed the LO coils. I made a copy for
future reference. Since my problem occurs (so far) only when it's
extraordinarily warm in the shack, I'm postponing any attempted repair.
73,
Jack K1VT
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Jack,
It's a few months since I had the same problem with my Omni VI on 160m.
If I remember correctly I was able to unbolt the FM and Driver boards
and flip them carefully to one side to get access to the mixer board. I
put a piece of thick paper under them to prevent shorts to the chassis
in their temporary position. I believe there was also at least one lead
I left disconnected from these boards to allow them to "flip" out of the
way, but which had no effect on the basic functioning of the Tx/Rx. It
should be obvious which they are.
There was a useful posting a few months ago on the list about how to
adjust the Crystal. It involved monitoring the pulse width on the PLL
chip. I did mine by monitoring the PLL control voltage, but I did find
that setting it mid-way between the 2 lock points didn't always give
best results. So the pulse width method is probably the way to go.
And as others have said, be careful of those cores - I cracked one, and
then the whole board has to come out!
73,
Steve G3TXQ
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