Elecraft K3 Assembly Manual - Manual (Page 29)

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Mount two 1-1/4” (31.8 mm) standoffs in the two holes on the KIO3 board as shown in Figure 33 using a
zinc 4-40 1/4” (6.4 mm) screw and inside tooth lock washer at each standoff. One is in the corner and the other
is about half way down the opposite side of the board. Do not put lock washers between the standoffs and the
board.
Inspect the KIO3 Audio board for a yellow dot at one corner of the board (see below). There are two
versions of the audio board, one with a yellow dot and one without. Both versions provide the same performance
but the version with a yellow dot requires a simple change to the firmware setup when you apply power to test
your K3. Check either “yellow dot” or “no yellow dot” below to remind you which version board you are
installing.
Yellow Dot No Yellow Dot
Figure 32. Yellow Dot on KIO3 Audio Board.
Plug the Audio I/O daughter board into J91 as shown in Figure 33. The second daughter board will be
installed later.
Figure 33. Preparing the KIO3 Board for Installation.