Elecraft K3 Assembly Manual - Manual (Page 30)

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Install the KIO3 Main board with the Audio I/O daughter board attached into the K3 as shown in Figure 34.
The KIO3A main board plugs into J76 on the RF board. If the KXV3 is installed, the coaxial TMP cable fits
between the KXV3 and KIO3 boards. Ensure the connectors are fully mated so the standoffs line up with the
screw holes on the rear panel.
Figure 34. Installing KIO3 Main Board.
The DB9 multi-pin connector on the KIO3 Digital I/O daughter board may have jackscrew nuts installed
on the connector. (Jackscrew nuts are shown in Figure 36). If so, remove them. They will be reinstalled shortly.
Install the KIO3 Digital I/O daughter board as shown in Figure 35. Be careful to support the KIO3 main
board as shown while pressing the daughter board in place.
Figure 35. Installing the KIO3 Digital I/O Board.