COBHAM 7023A, Installation Manual

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98-175666-A 6-1
Chapter 6
Service
6
This chapter has the following sections:
• Built-in test and LEDs
• Removal and replacement of the BDU
• Removal and replacement of ADU modules
• Troubleshooting basics
• Returning units for repair
6.1 Built-in test and LEDs
The ADU and the BDU have a Built-In Test Equipment (BITE) function in order to make fault
diagnostics easy during service and installation. The BITE test is performed during:
• Power On Self Test (POST), which is automatically performed each time the system is
powered on.
• Self Test, (web interface at
Service > Support
).
LEDs on the front panel of the BDU are used to signal:
• Power on/off
• Logon
• Fail/Pass
The built-in web interface shows events (BITE error codes) with a short message describing
each error or warning. This is also displayed in the BDU. In an error situation, one of the
following system status messages may be shown:
• BDU POST error
• ADU POST error
• SAFE MODE (plus information about the specific error, see
Event messages on page F-
1).
6.1.1 LEDs of the modules in the ADU
Each ADU module has one multi-color LED.
LED Behavior Description
RED Steady Powered but CPU not booted
RED Blinking Module failure
GREEN Steady Module OK
GREEN Blinking Boot loader/SW Upload
Table 6-1: LEDs of the ADU modules