• In this case, the fault can only be located in the module
• The failure is most likely to come from the power supply or from the CPU (control unit);
the next most likely cause is a set or network interface board interfering with the CPU.
- Total failure of a group of sets:
• if all the sets are on the same board, then the fault probably lies in the board
• if all the sets go out on the same cable, then the fault probably lies with the cable.
- Total failure of a single terminal: the fault is probably in the set itself. If not, check the
equipment in question.
- Partial failure of a single terminal: the fault is probably due to the configuration or mode of
operation.
2.1.4 Deliberate Reproduction of Defaults
To make sure that your analysis of the fault is correct, it is essential to try to repeat the failure
intentionally, unless it is unequivocal and permanent.
Once the fault is observed or repeated, and depending on the presumed source of the failure,
replace the faulty item with a working one and try to repeat the original fault again.
If the fault remains, perform a complete analysis of the failure again.
2.1.5 Locating Errors
Power supply problem
If the electrical and battery operation LEDs are both out, check all the fuses.
If the fuses are OK, this means that the duration of the electrical power outage has been
longer than the battery autonomy.
PowerCPU EE board problem
If the PowerCPU EE board LEDs are off, or are on steady, the system control unit is not
working.
Miscellaneous
For any fault signaled on a terminal (set, add-on module or optional terminal such as a printer,
etc), the following operations will be necessary:
- Test of the maintenance terminal in place of the failed terminal
- Test of the terminal at the module level
2.1.6 Element Substitution
2.1.6.1 Rules to Respect
Any substitution (power supply, PowerCPU EE board equipped with the ARMADA
VoIP32 daughter board) must be performed with the system powered down.
With OMC, you can save and subsequently restore the configuration (see "Data Saving").
If replacing a PRA board, make sure that the configuration of the new board is consistent with
the old one.
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