Elecraft KDVR3 - Manual (Page 10)

10
Hardware Upgrades
The following changes have been implemented in newer K3s to avoid the possibility of shorts or intermittent
operation in some K3s. All the hardware needed is supplied with your KDVR3 kit.
If you have the KRX3 installed, check the three screws securing the auxiliary DSP board to the main DSP
board to see if they are nylon or metal (see Figure 11). A nylon screw was originally used in one location. If the
other two are metal, replace them with the 4-40, 1/4” (6.4mm) nylon screws supplied. Use the same metal split
lock washers under each screw. This change eliminates the possibility of one of the metal screw heads shorting
to a live circuit on the front panel board.
Figure 11. Aux DSP Board Screws.
Check to see if the nylon standoff shown below near J51 is mounted on the main DSP board (see Figure
12). If not, install the nylon standoff supplied with your KDVR3 parts as shown. Be sure you place it in the
correct hole near the corner of the board. This standoff ensures that the main DSP board does not flex when the
front panel assembly is mounted on the chassis.
CAUTION: To avoid damaging a circuit trace very close to the metal ring around the screw hole, position the
lock washer under the screw so the split faces away from the trace. Tighten the hardware by turning the standoff
while holding the screw and lock washer stationary. Do not over-tighten the screw. It is easy to strip the
threads in the nylon standoff.
Figure 12. Installing Nylon Standoff on Main DSP Board.