On this day, a failed bypass capacitor (at the bottom left) of the power
amplifier cavity caused the transmitter to shutdown. This
capacitor is in the PA screen supply that typically runs about 600 VDC.
Turning the screen power supply breaker off allowed the transmitter to
run at about 20% power. Going to full lower on the screen control
allowed me to bring the transmitter power up slowly to about half power.
Then the capacitor started arcing, causing the transmitter to again shut
down. Once the problem was found, the plan was to replaced the defective feed-thru
with a temporary one until a permanent replacement arrived. The
capacitor is rated at 2500 Volts.