Elecraft KRX3 User Manual download pdf (Page 34)

Mount the Mixer and KNB3 boards on the main KRX3 board as shown in Figure 39. Be certain the

connector on each board is properly aligned and mated with the connector on the main KRX3 board. The boards

should be parallel to the KRX3 board. If they are tilted, check to ensure the correct number of washers were

installed under the standoffs and that you used the correct standoffs as shown in Figure 37.

Figure 39, Main KRX3 Board Ready for Installation.

Place the KRX3 main circuit board in the bottom shield so that the 1-1/2” screws extend through holes E7

and E13 on the KRX3 board. The two standoffs you mounted earlier should line up with holes E1 and E10 in the

board. Press the KRX3 main circuit board down against the standoffs. The board will “snap” into position as the

small bumps along the edges of the board slip into the holes in the sides of the shield. If some of the nubs do not

align with the holes in the shield, carefully file them flush with the board so they don’t push the sides of the

shield out of alignment. When properly positioned, the board will be against the standoffs in the shield.

Secure the KRX3 main circuit board to the standoffs at E1 and E10 with 4-40 3/16” (4.8 mm) black pan

head screws and #4 split lock washers as shown in Figure 40.

Figure 40. Mounting KRX3 Main PC Board on Bottom Shield.

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Elecraft KRX3 User Manual Page 34