Elecraft KPA500 Kit Assembly Manual - Manual (Page 27)

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Connect the cable from the interlock switch on the left side panel to the power supply module as shown in
Figure 35.
Figure 35. Connecting the Interlock Cable to the Power Supply Module.
Temporarily route all the heavy wires connected to the power supply module toward the front so they will
be out of the way for the next steps, then place the rear panel assembly directly behind the KPA500 chassis. It
will stand upright, resting on the fan housing.
Connect the 10-wire ribbon cable to the power supply module as shown in Figure 36. Note the brown wire
(pin 1) must go to the end of the connector nearest the KPA500 side panel. To do so it makes a 1/2 turn
twist. Be certain the connector engages both rows of pins.
Figure 36. Connecting the 10-Wire Ribbon Cable to the Power Supply Module.