I had similar trouble related to the synthesizer boards on a K3. On the newer
KSYN3A boards there is a green LED on the top edge of the board that should be
ON if the board is working ok. You mentioned a sub RX so you should have two of
these boards mounted against the back of the front panel.
Elecrafters,
i'm on vacation at a /p qth and K3 #2878 has quit working.
I have no power out. The display reads 0.0 watts when holding the tune
button, regardless of mode.
In RX I hear noise from the headphones , but no signals. The noise
sounds like the K3 sounds when no antenna is attached.
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