Working with Rob at Elecraft Service, I removed and checked the KIO3 Digital I/F board and found L1 blown. L2, L3, R12, and R13 are all good. L1 is on the ground lead from the sub-D9 connector, pin 5 to ground in the K3. Definitely blown as there is a carbon smudge next to L1. I installed a wire jumper but still inoperational.

Going to return the entire KIO3 unit to Elecraft for repair.

73, Ed - KL7UW
  http://www.kl7uw.com
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