Elecraft KPA500 Owner's Manual - Manual (Page 9)

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 Remove the 14 screws securing the KPA500 top cover as shown below. Do not remove the screw
indicated. It is part of the safety interlock switch mechanism. Lift the top cover off.
 Three taps are provided via red, green and yellow wires. Choose the tap according to the actual
mains voltage at the outlet you plan to use for the KPA500. If you cannot measure your mains
voltage, use the yellow tap.
115V Nominal Mains TAP 230V Nominal Mains
95V to 105V GREEN 190V to 210V
106V to 115V RED 211V to 230V
116V to 125V YELLOW 231V to 250V
 Be sure to place the unused taps side-by-side on the terminals at the back panel as shown. Do not
leave them floating loose inside the unit.
 Replace the top cover before proceeding. An interlock switch prevents operating the amplifier with
the top cover removed.