PROBLEM-SOLVING METHODOLOGY MAINTENANCE
Ed. 042/4 Réf. 3EH 21000 BSAA
EXTENT OF FAILURE
A failure may be characterized by various aspects:
- Total system failure:
• 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 ope-
ration.
DELIBERATE REPRODUCTION OF DEFAULTS
To make sure that your analysis of the fault is correct, it is essential to try to repeat the failure intentio-
nally, 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 element with a working one and try to repeat the original fault again.
If the fault remains, carry out the complete analysis of the failure again.
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