Elecraft K144XV Manual - Manual (Page 12)

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If you have a K3/10 with its blank rear panel, go on to the next step with a square check box. If you have a
K3/100, move the circuit breaker and the fans from the existing panel onto the new panel with the ANT 3 hole
as follows:
Transfer the fans to the new panel. The fans are held in place by four flat-head screws with the heads on
the inside surface of the fan panel. There are two different types of hardware used on the fans. If your
fans have flat head screws securing the finger guards on the outside of the fans, the four screws on the
inside of the panel screw into threaded bushings on each fan. Just remove them and fan will be free. If
your fans have cap nuts (often called acorn nuts) on the finger guards, the fans are held in place by long
screws that go all the way through the fans and thread into the cap nuts. When you remove the four
screws the finger guards will fall free too. When you reinstall the fans on the new panel, be sure you
have the ANT3 label facing the outside and place the fan with the shortest power leads farthest from the
circuit breaker. If your fans have cap nuts, be sure to orient the fans so they move air out of the K3.
Arrows embossed in the plastic on the fans show the air flow direction. Place the finger guards over the
screws before you replace the cap nuts.
Remove the knurled nut on the circuit breaker to release it, and install it on the new panel. It goes into
the lower hole (it will only fit in the correct hole).
Locate the TMP cable with a BNC connector at one end, remove the nut and lock washer (if on the
BNC) and thread the cable through the ANT3 hole in the panel from the side with the ANT3 legend,
then replace the lock washer and nut. Tighten the nut to hold the BNC securely.
Reconnect the two wires to the circuit breaker spade lugs. Either wire may go to either spade.
Reconnect the fans to the connectors on the KPAIO3 board where you removed them. Be sure you
orient the fan connectors so the red leads go to the pins on the fan connectors marked RED on the pc
board (see Figure 5).
Route the coax cable from the ANT3 connector across the fans to the opening in the KPA3 shield near
the KIO3 board. Pass it through the opening in t he shield and, if the KRX3 is installed, pull the end up
on top of the KRX3 module. It will be connected to the K144XV module later.
Mount the fan panel using the four screws you removed earlier. After the panel is secured, inspect both
fans to ensure the blades turn freely and are not in danger of hitting one of the cables.
Figure 5. Reconnecting Rear Panel Fans on K3/100.