Elecraft K3 Assembly Manual - Manual (Page 41)

40
Mount the three 7/16” (11mm) male/female standoffs on the component side of the main DSP board as
shown in Figure 53 using 4-40 nuts and #4 split lock washers. Be sure that:
The standoffs are on the component side of the board as shown.
No lock washer is used between the standoff and the board.
One split lock washer is used between the nut and the board.
Figure 53. Installing Standoffs on the Main DSP Board.
Plug the aux DSP board into the main DSP board by mating P52 and P53 on the aux DSP board (at the
narrow end) with J52 and J53 on the main DSP board. When fully seated, the connectors should be fully
engaged so that the pins do not show and the aux DSP board should rest against the top of the standoffs with the
holes in the board aligned for the screws (See Figure 54). Note that a two-row 10-pin connector at the top of the
aux DSP board does not mate with anything on the main DSP board. That is normal. Attach the boards with
three 4-40 1/4” (6.4 mm) nylon screws or the nylon screws you trimmed to length earlier (see Figure 52). Place
a split lock washer under each screw head. Do not place washers between the standoff and the pc board. Be
careful tightening the nylon screws. They are easily stripped!
Figure 54. Mating the Main and Auxiliary DSP Boards.