My K3 display shows ERR KEY when I turn it on.
Try disconnecting all cables from the K3 except the antenna and power
(obviously!) and see if the symptoms persist. If they don't, plug in one cable
at a time until the problem returns and go from there. Alternatively it could
be a problem with the I/O daughter board. If you still have the problem with
all cables disconnected remove the daughter board that has the RS232 and
accessory connectors on (the K3 will operate fine without it) and see if that
fixes the problem. If it does clean the daughter board thoroughly with
something that removes water soluble flux and a tooth brush, let it dry and
reinstall it and see if that fixes the problem. If the problem reappears you
could try again or get the board replaced.
If removing the board doesn't fix the problem I'd suggest contacting Elecraft
tech support.
Regards,
Paul M1PAF
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