Elecraft K1 - Manual (Page 32)

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LECRAFT
Turn the K1 off and disconnect the power supply.
Install the headphone jack, J2, on the small board extension near
the front-left corner. The pins on J2 are not very long, so they will be
nearly flush with the bottom of the board. Solder the pin closest to the
front edge first (ground), then verify that the jack is seated flat on its
plastic nubs before soldering the other pins.
Mono Headphones: If you plan to use only a mono plug at J2, cut the
trace marked "cut = mono" on the bottom of the board, under J2.
(You'll lose the sound on one side of stereo headphones.)
Install the key jack, J3, at the back-left corner. Before soldering,
make sure that the jack is aligned with its PC board outline.
Install the antenna jack, J5 (BNC), in the back-right corner.
Solder one of the large ground mounting pins first. If J5 then appears
to be tilted or twisted, reheat this ground pin while pushing J5 down
onto the board. Once it is seated properly, solder the remaining pins.
The internal speaker connector, P2, is a 2-pin connector with a
locking tab. Orient P2 as shown by its PC board outline, near the
front-right corner of the board, with the locking tab facing the front.
P2 must be seated flat against the board before soldering.
Install crystal X5, near the front edge of the board. Make sure it
is flat against the board and not tilted before soldering. (The leads can
be bent to hold it in place.)
Install X6 near the back-left corner.
Install X1-X4 at the front-right corner.
Ground the cases of all six crystals, using the near-by ground
pads. Use discarded component leads as before. Limit soldering time
to 4-5 seconds to avoid overheating the crystals.
Install R39 (1.8 k, BRN-GRAY-RED) on the bottom of the board
near crystal X6.
In the back right corner of the board near the antenna jack (J5),
install P3, a 3-pin male connector. The long end of P3's pins face up.
Install the two-pin shorting jumper across pins 1 and 2 of P3 (the
two terminals closest to J5).
On the bottom of the board, install R4 (5.6 k, GRN-BLUE-RED).
Locate the miniature slide switch, S2. Install S2 on the bottom of
the board, with the switch pressed down onto the board as far as it will
go. (If it isn't pressed all the way down, the actuator might hit the
bottom panel.) Limit soldering time on each of S2's pins to 2 seconds
to avoid melting the plastic body.
Set S2's actuator to the "OPER" (operate) position.
Locate the component outline for RF choke RFC9, on the bottom
of the board between the pins of relay K1. Flush-trim the four pins of
K1 closest to RFC9.
Form the leads of RFC9 (15 µH, BRN-GRN-BLK) to fit between
the indicated pads. Install RFC9 and position its leads so that they
don't contact any adjacent pads of K1. Solder and trim RFC9's leads
from the top side of the board.