98-175666-D 5-1
Chapter 5
Service 5
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
5.1 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).
5.1.1 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 5-1: LEDs of the ADU modules
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