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Removal and replacement of the ACU
8-12
Chapter 8: Service
98-166784-A
8.3.2
LEDs in the ACU
The ACU has 3 LEDs: on the front panel: Power, Logon and Fail/Pass LED.
8.3.3
LEDs of the PIU
The PIU has one LED on its front plate.
8.4
Removal and replacement of the ACU
There are no parts in the ACU that you can remove or replace. Contact your Cobham
SATCOM service partner for further repair or replacement.
LED
Behaviour
Description
Power
Steady green Power supply OK
Steady red
Power supply failure
Off
No power
Logon
Flashing
green
Current status is displayed:
• Searching satellite
• Identifying satellite
• Carrier lock & TX enabled from modem
Steady green Satellite link established
Off
No satellite link acquired
Fail/Pass
LED
Steady red
A fault which prevents operation is present in the system
(ACU, ADU, MODEM).
Flashing
green
A Power On Self Test (POST) or Person Activated Self Test
(PAST) in progress. The current status is displayed.
Flashing red
Active BITE failure or warning. The event is shown in the ACU
display.
Steady green No faults.
Table 8-2: LEDs on the ACU
LED behaviour
Description
Off
No power
Green
Ok
Orange
Fail
Table 8-3: LED behaviour of the PIU