Elecraft KRX3 - Manual (Page 54)

A-7
If you removed the KBPF3 board, replace it. Be sure the three connectors are aligned so all the pins
engage. The connectors are visible from the sides. Secure the board at locations in Figure A-5. Use the
4-40, 1/4” (6.4 mm) pan head screws and split lock washers you removed earlier. Do not use inside tooth
lock washers.
Replace the unthreaded sleeves over each of the long screws so they rest against the top of the circuit board
(locations in Figure A-5), then place the top shield over the assembly and adjust its position so the edge of the
top fits inside the bottom and rests against the KRX3 main board on all sides. The long screws will pass through
holes in the top cover. Secure the top with the knurled nuts finger-tightened only enough to hold the cover in
place so it isn’t loose. Lock washers are not used under the knurled nuts.
Turn to your KRX3 Installation and Operation manual, and follow the procedures under Installing the KRX3
Subreceiver Module and Final Assembly to complete the installation and reassembly of your K3. Note that:
a) You will not need to assemble the battery cover, but be sure it is in place on the battery as shown. The
cover is essential to avoid shorting the battery to the bottom of the KRX3 enclosure.
b) Jumper W4 already will have been removed since the KRX3 was previously installed.
c) The speaker pad should already be in place.
Important:
When you have finished reassembling your K3, you must complete the filter setup in the
next step or your subreceiver will not function correctly.
Refer to the data you recorded in Table A-1 and set up the filters you have installed as described under
Configuration / Crystal Filter Setup in your K3 Owner’s Manual.
That completes the installation of crystal filters in your KRX3 subreceiver.