Elecraft K2 Owner's Manual - Manual (Page 19)

18
E
LECRAFT ®
i
The connectors used in the following steps have plastic bodies
that can may melt if too much heat is applied during soldering, causing
the pins to be mis-positioned. Limit soldering time for each pin to 3
seconds maximum (1 to 2 seconds should be adequate).
Install the 2-pin male connectors, P5 and P6. As shown in Figure
4-5, the polarizing tab on each connector should be closest to the top
edge of the board. P5, the voltmeter input connector, can be found near
the upper left-hand corner of the board. P6 is used for frequency
counter input, which is in the upper right-hand corner.
Locking
Tab
Top side of
PC Board
Figure 4-5
Install the 10-pin, dual-row connector, P4 (to the left of P5). The
short ends of the 10 pins are inserted into the board. P4 must be seated
flat on the board before soldering.
Install P7, a 3-pin male connector (to the right of P5). The short
ends of the 3 pins are inserted into the board.
Install a shorting jumper onto the two right-hand pins of P7.
At the upper left and right corners of the board are short jumpers,
labeled with ground symbols ( ). Use discarded component leads to
make 3/4" (19 mm) long U-shaped wires for each jumper (Figure 4-6).
Solder the jumpers on the bottom of the board, with the top of the U-
shape approx. 1/4" (6 mm) above the board.
Figure 4-6
Locate the outlines for resistors R18 and R19 on the bottom side
of the Control board.
i
The pads used for R18 and R19 are shared with connectors J1
and J2, which are labeled on the top side of the board. These
connectors are provided with the KAF2 and KDSP2 audio filter
options. You should not install J1 and J2, or an audio filter option,
until after K2 assembly and checkout have been completed.
Install short wire jumpers at R18 and R19. Make the jumpers
from discarded component leads as you did above, but keep them flat
against the board. Solder the jumpers on the top side.
Install the following resistors on the bottom side of the board
(solder on the top side):
__ R12, 820 (GRY-RED-BRN) __ R11, 47 k (YEL-VIO-ORG)