Removal and replacement of the BDU
98-175666-A Chapter 6: Service 6-2
6.1.2 LEDs in the BDU
The BDU has 3 LEDs: Power, Logon and Fail/Pass LED.
6.2 Removal and replacement of the BDU
There are no parts in the BDU that you can remove or replace. Contact your Cobham
SATCOM service partner for repair or replacement.
6.3 Removal and replacement of ADU modules
All replacement of modules must be done by a Cobham SATCOM service partner. Before
contacting your service partner check the LEDs on all modules (ACM, ISM and motors).
Figure 6-1: BDU — LEDs
LED Behavior 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
(ADU, BDU).
Flashing green A Power On Self Test (POST) or Self Test in progress. The
current status is displayed.
Flashing red Active BITE failure or warning. The event is shown in the
BDU display.
Steady green No faults.
Table 6-2: LEDs on the BDU
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