Elecraft KRX3 User Manual download pdf (Page 20)

Hold the front panel in place against the chassis assembly and turn the unit over to look at the two multi-

pin connectors on the top of the RF board. See if they are engaging the corresponding connectors on the front

panel assembly (see Figure 21). Adjust the position of the RF board or the front panel assembly to ensure they

are mating properly.

Figure 21. Mounting Front Panel Assembly - Mating P50 and P51.

With the pins of all four connectors started, press the front panel onto the RF board connectors. Press only

from the bottom of the front panel to avoid flexing the RF board. You can use your fingers to press on the back

side of each multi-pin connector on the top of the RF board while holding the front panel to engage them. There

may be small areas of pins showing even after they are mated. You will know they are properly mated when the

screw holes on the bottom lip of the front panel assembly line up with the screw holes in the 2D fasteners on the

bottom of the RF board.

Secure the front panel assembly at the bottom lip to the 2D fasteners at the forward edge of the RF board

with the two 4-40 3/16” (4.8 mm) black pan head screws you removed earlier. No lock washers are used on the

external case screws.

Fasten the top of the front panel assembly with three 4-40 3/16” (4.8 mm) black flat head screws (see

Figure 7 on page 13).

Replace the 3/16” (4.8 mm) black pan head screw and, if used, lock washer in the 2D fastener (see Figure 6

on page 13).

Replace the left side panel (with the handle) as follows:

Start the six 4-40 3/16” (4.8 mm) black flat head screws through the panel: three along the bottom, one

at the top rear, one at the top front, and one just below the front end of the handle. There will be one

empty screw hole for the attachment to the chassis stiffener. That will be replaced later. It is normal to

adjust the position of the panels slightly when assembling so the screw holes line up. The cabinet will

become structurally sound and rigid when all the panels, including the top and bottom covers, are

mounted.

Tighten all six screws. Be sure all the screws are tight, including the screw near the forward end of

the handle that threads into the front panel shield.

Leave the bottom cover off for now. You will need access to that area of the RF board later.

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Elecraft KRX3 User Manual Page 20