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NDA-24282 (E) CHAPTER 9
Page 451
Revision 1.0
SYSTEM MAINTENANCE
4.2.2 BAD CALL NOTIFICATION
Perform the diagnostic work followed by “System Operations and Maintenance Manual”.
5. FAULT RECOVERY PROCEDURE
5.1 BEFORE STARTING FAULT RECOVERY
After the fault diagnostics based on fault information such as the alarm and system messages, the next procedure
to be done is the fault recovery. Before proceeding to this, it is required to examine when it should be started by
comparing the emergency of repair and its influences. Particularly, when the fault is determined in the ST-BY
system, the work should be done at night when the ACD system is operated less frequently. The fault recovery
procedures can be divided into those on the ACD system and those on the MIS, as shown below.
Figure 9-4 Flow of Fault Recovery Procedures
5.2 ACD SYSTEM FAULT RECOVERY PROCEDURES
See the “NEAX2400 IMX System Operations and Maintenance Manual” for the fault recovery procedure
related to the ACD system shown below.
Fault information Collection
ACD System Fault Recovery –
MIS Fault Recovery –
See Section 5.2
See Section 5.3
Section 4.2, “Diagnostics from System Messages”
1. ACDP of Fault - Fault occurs intermittently at ACT side
2. ACDP of Fault - ST-BY side is faulty