Elecraft KX1 Manual User Manual

Page 22

LECRAFT

Insert electrolytic capacitor C38 (10 µF, 35 v) with the longer lead

passing through the square solder pad with the (+) symbol next to it
and the shorter lead through the round pad. Bend the leads to hold the
capacitor in place against the board.

Be sure that the capacitor is tight against the board and solder the

leads. Use a ruler to verify that the top of the capacitor is no more than
5/16” (7.9 mm) above the board (see Figure 8). After soldering, trim
the leads flush with the bottom of the board.

All electrolytic capacitors MUST be installed with their

leads oriented to observe the polarity markings as described
above.

Install electrolytic capacitor C10 (10 µF, 35 v) below resistor R13

at the bottom edge of the board. Observe the proper polarity as you
did for C38 above, and be sure the capacitor is no higher than
5/16” (7.9 mm) above the board.

Turn the board over so the bottom face is up and the outline for J1

is in the upper right corner.

Install electrolytic capacitor C7 (220 µF, 25 v) at the center of the

board near resistor R28. Be sure to observe the proper polarity as
you did above. Save one of the clipped leads to use in the following
steps.

Turn the board over so the top face is up and test-fit the low-

profile crystal in the space provided for X1 near the bottom edge
below the socket for U1. The crystal may be installed either way.
Note: The holes in the solder pads for X1 may be larger than necessary
to fit the leads. This is normal. It is to accommodate different styles of
leads on the crystals supplied with some kits.

Do NOT use more solder than necessary on the leads for

X1. Too much solder will wick through the holes and may cause a
short to the case of X1 underneath the crystal. The short is
impossible to see or correct without removing the crystal.

Spread X1’s leads as necessary to hold the crystal against the

board and solder one lead. Do not hold your iron on the lead more
than 2 or 3 seconds, maximum. Too much heat will ruin the
crystal.

Check to ensure that X1 is sitting directly against the board. If

necessary, reheat the soldered lead while pressing down on the crystal.

Solder the second lead to X1 and trim the leads flush.