Hi Josep, EA6BF;
Was the circuit breaker tripped? If so, push it in to reset.
If not, it is unlikely to be defective, just check for 12V on both wires
at the KPA3.
More likely it is the DC power pins going to the KPA3 100w module are burnt.
This happens on older K3s, before serial # approximately 3200.
It could be either the ones on the RF board or the ones on the KPA3.
They were tin and the mismatch of metals causes oxidation, then due to
resistance, they get hot and darken.
The fix is to replace the 6 pins on the end with gold (and the
corresponding connector if burnt).
Order KPA3CONMDKT _gold
https://elecraft.com/products/gold-connector-mod-kit
Keith WE6R K3/K4 Tech
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