A friend of mine had a problem very similar to yours; his K3 couldn't hear anything. He brought it to my QTH for testing and comparison to my K3.
It turned out that he had not correctly set up his receive crystal filters. Be sure that you have done the crystal filter setup, on page 46 of the Owner's Manual (not the Assembly Manual). Pay special attention to the receive portion of the setup instructions.
Be sure to do the setup for each filter you have installed. Verify the numbers of the slots where you installed the filters. Also make sure that the K3's display is showing a filter slot where you have a filter installed. If you get the filter numbers out of sync (as my friend did), the result can be a deaf receiver.
My friend is now quite happy with his K3.
73, Paul W8TM
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