Elecraft KX3-4M - Manual (Page 29)

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Figure 24. Shield Notch Location.
Place the shield over the metal frame on the KX3-2M or 4M board oriented as shown in Figure 25,
and press it down so the small bumps on the frame are in the holes along all four sides of the shield. The
bumps latch the shield in place.
Do not operate your KX3-2M or 4M with the shield removed. It is required to
provide essential isolation between circuits.
Figure 25. Installing the Shield.
Reassemble the KX3 enclosure (see Figure 4)
 Reconnect the ribbon cable.
 Reconnect the battery cable.
 Replace the batteries (if used).
 Close the case.
That completes the installation of your KX3-2M or 4M module.