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Troubleshooting
Diagnostics
Receiver Self-Test
Upon power-ON, the 90478 module tests its internal memory (RAM
and ROM). If a failure is detected, the front-panel LED blinks and the
module will not sign-on to the monitor.
Receiver LEDs
The 90478 receiver has three diagnostic LEDs that are visible by
looking behind the module spring-loaded handle as it is held open.
To view these LEDs, swing the handle out as if you were going to
unplug the module and look inside the opening on the right side. The
LEDs are located on the digital PCBA and are known as LED3
(bottom), LED4 (middle), and LED5 (top).
Figure 5-1 90478 LEDs
open handle
to see LEDs
(LO locked)
(ANT 2/ANT 1)
(out-of-sync)
LED5
LED4
LED3
green
red
amber
