Elecraft KRX3 User Manual download pdf (Page 15)

With the three screws removed, the main DSP board is held on to the front panel board by two multi-pin

connectors. Slip your finger tips between the boards and pull the main DSP board away from the front panel

board to unplug it.

A large, thick spacer washer should be

lying on the front panel near the hole for the

phones jack (see Figure 12). This spacer fits

between the phones jack and the back of the

front panel board to provide a solid mechanical

ground connection when the boards are in place.

Remove the washer and set it aside. If it’s lying

on the inside of the front panel you can tip the

panel so it will slide out at the end.

Figure 12. Phones Jack Washer.

If your kit was supplied with 1/4”

6.4mm) long nylon screws, skip this step. If

you have 1/2” (13mm) nylon screws, cut all

three of them to length as follows:

Screw three 4-40 nuts onto the 1/2”

(13 mm) 4-40 nylon screw as

shown in Figure 13.

Cut off the nylon screw flush with

the last nut. Sharp diagonal cutters

or a knife will cut the nylon.

After cutting, remove all three nuts.

(The nuts establish the correct

length for the screw and “clean up”

the thread where you cut the

screw.)

Figure 13. Cutting 1/2” (13mm) Nylon Screws.

CAUTION

The boards are especially vulnerable to ESD damage when unplugged. Wear a

wrist strap or touch an unpainted metal ground frequently when handling the

boards to avoid ESD damage. See Preventing Electrostatic Discharge Damage on page 5

for more information.

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Elecraft KRX3 User Manual Page 15