4
Install R4 and R5 (1 k, brown-black-red). Solder and flush-trim as before.
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L1, L2, and L3 may be labeled R1, R2, and R3 on your PC board.
Install the 47 µH subminiature RF chokes (yellow-violet-black) at either
L1-L3
or
R1-R3
, depending
on how your PC board is labeled. The leads on these chokes are fragile; do not pull them or bend them
excessively. Solder and flush-trim.
Pre-Installation Checks
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Some components on the KX1 PC board can be damaged by electrostatic discharge.
To avoid a difficult or expensive repair, put on a wrist strap, or touch ground before
proceeding and often while handling the board.
Remove the KX1's bottom cover and unplug the battery pack. Remove the VFO knob and the three
screws on the top cover. Separate the KX1 PC board from the top cover.
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All of the steps below must be completed successfully to ensure that the KXB30 will
fit into its position on the KX1 PC board.
The following components in the area of U6 on the KX1 main board must be mounted flat against the
board, with no excess lead length showing: C1, L7, R19.
Q8, Q2, and Q3 must be mounted as specified in the KX1 assembly instructions, with their rounded
sides
down
(touching the KX1 PC board) and their flat (labeled) sides up. Q8 must be mounted exactly as
shown by its component outline to prevent interference with one of the RF chokes on the KXB30 board.
U6 (SA/NE602 or SA/NE612) must be mounted as close to the PC board as possible. Its top surface
should be 5/32" (4 mm) or less above the surface of the PC board. If it sits higher than this, it must be
removed and re-installed flat against the board as described in the KX1 manual.
On the bottom of the KX1B30 PC board, locate the pads labeled with single letters
5, D, G, C, B, A,
and
G
in this order from left to right. There's a third "G" pad near the "2003" label that will not be used.
The KXB30 module will be installed
upside-down
in the position showed in
Figure 1
on the next
page, directly on top of U6. To verify that there are no obstructions, temporarily place the KXB30 in this
location. The
D
and
5
pads should be to the left. The trimmer capacitors (C1 and C2) must line up with the
two large holes in the KX1 board (on either side of U6). Turn the KX1 over to verify this.
If the module doesn't fit in its intended location, re-check the positions and heights of all components
on the KXB30. Also check components installed in the area of the KX1 board shown in the photo.
