M3SR Series 4100 Troubleshooting
6.8 Operating Manual 6175.4760.02 – 01
Not all functions can be tested within the PBIT. If the user needs to know more details
about the status of the radio, the next step may be to initiate the IBIT (see ”Initiated
Built-in Test (IBIT)” on p. 6.9).
6.2.3 Continuous Built-In Test (CBIT)
The continuous built-in test (CBIT) is the least profound test, but it is running continuously in
the background. It is not influencing normal operation of the equipment and will not change
any settings of the radio while in progress. In practice, the CBIT is running with an update
rate of about one update per second.
If CBIT detects an error, a message box comes up on the control unit indicating an error
or a warning.
If an error is detected, the GO LED on the radio front panel and the GO LED on a connected
control unit will be switched off.
To get more details about the detected error or warning, check the radio error list (see
sect. 3.4 Radio Maintenance and Figure 6.5).
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