[Elecraft] K3/ERR IF 1

[Jacek Marczewski]

I assembled today a brand new K3 (S/N 4193, the newest firmware).
Performed  synthesizer calibration and filter setup (only 2.8kHz i 
position FL1).
Got IF1 ERR message. The rig is in minimal configuration. The owner's 
manual says
De-install the KNB3 (the error message disappears but the radio is dead).
Any idea?
Jacek SP5EAQ