NEAX2000
IVS
2
Maintenance Manual
Page 120
ND-70926
(E),
Issue
3.0
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
mark on the right side of the items concerned
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
mark and necessary actions were taken, replace the circuit card(s) and
other hardware indicated by the
mark with spare(s). In this case, every
time hardware is replaced with a spare, check whether the fault is recovered.
Figure 2-5 How to Follow the Programming Tree
CHECK
CHECK
REPLACE
START
END
Symptom
Step 2
CHECK
REPLACE
Step 3-1
(1)
Step 3-2
(2)
Step 4-1
(1)
Step 3-3
(3)
Step 4-2
(2)
Summary of Contents for NEAX 2000IVS2
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