Explanation Of Symbols In Troubleshooting Procedure; How To Follow The "Tree - NEC UNIVERGE SV8300 System Maintenance Manual

Explanation of Symbols in Troubleshooting Procedure

The following explains the instruction marks being used in the Troubleshooting Procedure in "Station Line
Fault" through "DSS Console Fault".
: With respect to the item indicated on the right side of this mark, perform a check or re-
CHECK
quired work. If an abnormality is found, take the required remedial action, such as repair,
replacement, etc.
: Replace the equipment or device (considered to be the fault) indicated on the right side of
REPLACE
the mark with a spare and confirm the recovery of the fault.

How to Follow the "Tree"

In "Station Line Fault" through "DSS Console Fault", the Troubleshooting Procedure is explained in the
form of a "Tree". Troubleshooting can be performed accurately, as well as efficiently, by following the re-
lated "Tree" path according to the information available on the fault. In the following are given step-by-
step explanations about how to use the "Tree".
STEP1: The maintenance personnel gathers information concerning the fault, and selects the tree (to be)
used from "Sections for Troubleshooting Procedure".
STEP2: 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.
STEP3: The items indicated by
ments which are possibly responsible for the fault. Check each of these items. If an abnormality
has been found, perform necessary remedial action such as repair, replacement, etc.
STEP4: When the fault is not recovered even if a check has been made on the items indicated by
CHECK
wares indicated by
replaced with a spare, check as to whether the fault has been recovered or not.
CHECK
mark and necessary actions have been taken, replace the blades and other hard-
mark with spares. In this case, every time a hardware has been
REPLACE
mark on the right side of the items concerned indicate ele-
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Chapter 2 TROUBLESHOOTING
FAULT INFORMATION DISPLAY
NWA-033627-001 Rev.4.0
95ch2001.fm