Elecraft KRX3 - Manual (Page 16)

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Mount the three standoffs on the component side of the main DSP board as shown in Figure 14. Be sure
that:
 The standoffs are on the component side of the board as shown.
 No lock washer is used between the standoff and the board.
 One lock washer is used between the nut and the board.
Figure 14. Installing Standoffs on the main DSP Board.
Check to see if the nylon standoff shown below near J51 is mounted on the main DSP board. If not, install
the nylon standoff supplied with your KRX3 parts as shown below. Be sure you place it in the correct hole near
the corner of the board.
CAUTION
To avoid damaging a circuit trace very close to the metal ring around the screw hole,
position the lock washer under the screw so the split faces away from the trace. Tighten the
hardware by turning the standoff while holding the screw and lock washer stationary. Do
not over-tighten the screw. It is easy to strip the threads in the nylon standoff.
Figure 15. Installing Nylon Standoff on Main DSP Board.