Elecraft KX1 Manual - Manual (Page 40)

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LECRAFT 39
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The optional KXAT1 ATU module plugs directly into
connectors J6, J7, and J8, which you’ll install in the following
steps. They MUST be positioned vertically (not tilted) or the ATU
module cannot be installed.
Turn the board bottom face up with jack J1 in the upper right
corner.
Install two-pin jack J8 on the board just below antenna jack J2 in
the upper left corner as follows:
_ Hold the jack vertical with your finger while tack-soldering
one pin.
_ Carefully inspect the jack to ensure it is vertical with respect
to the board and both ends of the jack are down against the
board.
_ Solder the pins, reheating the one you tack-soldered last to
ensure a good joint.
Install the following jacks using the same procedure.
_ J7, three pins, just above J2 in the upper left corner.
_ J6, five pins, just below J1 in the upper right corner.
Separate the three potentiometers according to their values:
_ Two 1k pots (B1K)
_ One 10 k pot (B10K)
Turn the board top face up with KX1 in the upper left corner.
Install potentiometer R2 (B10K) as follows:
_ Locate the printed outline for R2 next to electrolytic
capacitor C20 on the right side of the board. This is the
CENTER of the three outlines.
_ Position R2 (B10K) so the three signal pins and two large
mounting tabs are in the holes in the board.
_ Press down on the potentiometer until it rests solidly against
the board on the two metal nubs next to each mounting tab
and the shaft extends straight up at right angles to the board.
_ Solder one of the smaller pins, then recheck the alignment to
make sure the pot has not been moved.
_ Solder and trim the remaining small pins.
_ Solder the two large pins using just enough to make a good
electrical and mechanical joint between the tab and the plated
hole. Do NOT try to fill the hole with solder.
Install potentiometers R1 and R3 following the same procedure.
_ R1 (B1K) above R2.
_ R3 (B1K) below R2.