User's Manual

NDA-24300 CHAPTER 2
Page 33
Issue 1
SYSTEM MAINTENANCE OUTLINE
Figure 2-25 Recovery Procedure Example
4. REPORTING FAULT TO NEC
When the cause of a fault is uncertain, make note of the situation involved and report it to NEC. When for-
warding faulty circuit cards to NEC, exercise caution to protect from static electricity.
4.1 Fault Reporting Method
The following three items must be included in the report without fail:
(1) Faulty situation (reports should be similar to “dial tone is not heard only on individual lines,” “incoming
C.O. line calls are not able to be terminated only to a specific ATTCON/DESKCON,” etc.)
• Faulty phenomena
On lifting the handset, dial tone is not heard but side tone is heard, etc.
START
END
Check
(A)
(B)
When
(C)
(D)
When
(F)
(G)
Check
Check
(E)
When
(G)
(F)