Elecraft KXV3 Manual - Manual (Page 14)

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Install the KIO3 Digital I/O daughter board as shown in Figure 15. Be careful to support the KIO3 main
board as shown while pressing the daughter board in place.
Figure 15. Installing the KIO3 Digital I/O Board.
Install the KIO3 rear panel as shown in Figure 16.
Figure 16. Mounting the KIO3 Rear Panel.
Reinstalling the KRX3 Subreceiver Module
If your K3 does not have a KRX3 subreceiver, go directly to Replacing the Top Cover on page 15.
If your K3 is equipped with the KRX3 Subreceiver, turn to your KRX3 Subreceiver Installation and
Operation manual, Installing the KRX3 Subreceiver Module section to replace the KRX3 module. Be especially
careful to do the following as described in that procedure:
Be sure the cover on battery BT1 on the K3 RF board is in place. The cover is essential to avoid
shorting the battery. The outer rim of the battery is the positive terminal, and may come in contact with
the grounded bottom of the KRX3 enclosure if the cover is not in place.
Be sure all the TMP cables are properly connected or your K3 will not operate properly.
Be sure the TMP cable to J85 on the subreceiver module is routed as shown to prevent signal leakage
between the KRX3 and the K3 main receiver.