Operation

When you push the test switch, the receiver does a check of the internal receiver operation and the interface with the NAV control panel. The test takes 48 seconds. This is the test sequence that shows on the LED status indicators during the test:

· 0 to 2 seconds - the LRU status and the control fail LEDs are red

· 2 to 4 seconds - the LRU status LED is green and the control fail LED is red

· 4 to 12 seconds - the LRU status and the control fail LEDs go off

· 12 to 42 seconds - test status shows.

The LRU status LED indicator shows green for an LRU test pass condition or red for an LRU test fail condition. The control fail LED shows red if there is no tune input from the NAV control panel or if the signal is invalid.