Elecraft PX3 Owner's Manual - Manual (Page 44)

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Remove the power supply pc board and mount it on the back of the front panel board as shown in Figure
32. Be sure the multi-pin connectors are properly lined up and fully mated as shown in Figure 33. The
connectors fit very tightly.
While pressing the boards together, rock the power supply board to “walk” the connectors together
Figure 32. Installing the Power Supply Board.
Figure 33. Mating the Power Supply Board Connectors.