How To Follow The Programming Tree; Figure 2-5 How To Follow The Programming Tree - NEC NEAX 2000 IVS2 Maintenance Manual

CHAPTER 2 TROUBLESHOOTING
Fault Diagnosis and Troubleshooting

HOW TO FOLLOW THE PROGRAMMING TREE

The troubleshooting procedure is explained in the form of a "Tree". Troubleshooting can be
performed accurately, as well as efficiently, by following the related "Tree" path according to the
information available on the fault. The following information gives a step-by-step explanation
about how to use the "Tree."
Step 1: The maintenance personnel gathers information concerning the fault and selects the
tree to use from
Step 2: In the selected tree, search the item concerned by checking the symptom one by one
following the tree downward from the "START" point. If the related item has not been
found, gather more detailed information concerning the fault.
Step 3: The items indicated by the
suggest elements that are possibly responsible for the fault. Check each of these items.
If an abnormality is found, perform the necessary remedial action such as repair,
replacement, etc.
Step 4: If the fault is not recovered after a check was made on the items indicated by the
CHECK
other hardware indicated by the
time hardware is replaced with a spare, check whether the fault is recovered.

Figure 2-5 How to Follow the Programming Tree

START
END
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Figure 2-4.
CHECK
mark and necessary actions were taken, replace the circuit card(s) and
Symptom
Step 2
mark on the right side of the items concerned
mark with spare(s). In this case, every
REPLACE
(1)
CHECK
(2)
(3)
(1)
REPLACE
(2)
Step 3-1
Step 3-2
Step 3-3
Step 4-1
Step 4-2
2
NEAX2000 IVS Maintenance Manual
ND-70926 (E), Issue 3.0