When powered on, the microphone will automatically run a test
procedure to detect any malfunction of the system. In case any
malfunction detected, all four indication LED’s will start blinking.
Indicator LED functions
The indication LED’s on the APM have following functions:
Enable (orange) LED: Indicates the operation status of the databus
Flashes when the chime tone is playing
Illuminates when the databus is busy (priorairy APM is paging)
Good (green) LED: Indicates the correct voice level when speaking
Illuminating when voice level is OK
Peak & low (red) LED’s: Indicates incorrect voice level
Illuminating when voice level is too high (peak) or too low (low)
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