Elecraft KPA500 Owner's Manual - Manual (Page 15)

15
Operation
Power On
1. Ensure a suitable 50 ohm load is attached to the RF OUTPUT connector on the rear panel (Figure
1, ). A dummy load is recommended for initial tests.
2. Enable the power supply by pressing the rear panel rocker switch (Figure 1, ) to the On (I)
position.
Switches with a legend above and below the pushbutton have two
functions. Tap (press briefly) to activate the function labeled above a switch.
Hold to activate the function labeled below the switch. In the text, tap
functions are shown like this:
T E M P . An example of a hold function is P K
H O L D .
Figure 5. KPA500 Front Panel.
3. Tap the O N switch . The LCD and STBY LED should light. When you tap the O N switch again to
turn the amplifier off you will hear the fan run. This is done to bleed off the 60V power supply voltage.
The fan stops when the voltage reaches a safe level so, if you are preparing to open the KPA500 cabinet
for any reason, be sure to allow the fan to run until it stops before switching off power with the rear
panel rocker switch or unplugging the KPA500 from mains power.
If at any time the FAULT LED lights, refer to Fault Conditions, pg. 18.