Elecraft KX3 Assembly Manual - Manual (Page 18)

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Plug the speaker connector into J7 next to the VFO encoder board (see Figure 17).
Figure 17. Connecting the Speaker to the CP Board.
Be certain you oriented the speaker plug as shown in Figure 17. Reversing
it may result in intermittent or distorted audio from the speaker.
Turn the front panel assembly over and lace the lock washer and remaining hex nut on the VFO encoder.
Tighten the nut using your needle nose pliers since there is very little space for a wrench or nut driver. Tighten
only until the nut is snug and pressing into the teeth on the lock washer. Do not over tighten or you may force
the encoder to turn, damaging the encoder pc board and possibly the CP board too.
Figure 18. Encoder Mounting Hardware.