NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 2
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SYSTEM MAINTENANCE OUTLINE
(4) How to clean the connector portion (gold-plated terminal):
(a) Dip the gold-plated terminal portion in the cleaning fluid for 3 to 5 seconds (only PA-XX type circuit
card), as shown in Figure 2-31.
Figure 2-31   How to Clean the Connector Portion
Note 1:
Some of the parts are subject to damage if they come in contact with the cleansing liquid. Be careful
to allow only the connector portion (gold-plated terminal) to contact the cleaning...

CHAPTER 2 NDA-24307
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SYSTEM MAINTENANCE OUTLINE
The following is an example where the fault was recovered after the replacement of circuit cards:
(8) When a fault recovery is completed, use the RALM/RALMN command to clear all the alarm indications
and registered system messages. If required, restore temporary cross connections and transient data for
testing to the original ones.Set the 1st circuit card back into its mounting slot
If the fault recurs: Replace the circuit card.
Set the 2nd...

NDA-24307 CHAPTER 2
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SYSTEM MAINTENANCE OUTLINE
3.2 How to Follow Diagnostic Procedure/Fault Repair Procedure
(a) Diagnostic Work
A fault diagnostic procedure by system message is explained in the “TREE” format on an individual
system message basis.
Proceed with judgment as to whether the fault status coincides with the indicated status, following
the sequence beginning from START.
How to proceed with the diagnosis work is explained in Figure 2-33.
STEP 1 Determine whether the fault...

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Figure 2-33   Diagnostic Work Items and Symbols Example
FAULT SUPERVISION START
END
WhenFAULT
Section No. (1)
:  It is the fault of 
Perform(3)
(4)
When
(5)
(2)
WhenFAULT
Section No. :  It is the fault of  (7)
When(8)with
performed
FAULT
Section No. :
(9)
CHECK OF WORK
(6)
(10)
(11) (Chapter 5)
(Chapter 5)(Chapter 5)
(11) (5)
Note:(1): Judgment of fault status
(2),(6),(7),(9): When the fault status coincides with the indication, the cause...

NDA-24307 CHAPTER 2
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SYSTEM MAINTENANCE OUTLINE
Figure 2-34   Recovery Procedure Example
START
END
Check(A)
(B)
When(C)
(D)
When(F)
(G)
Check
Check(E)
When
(G)(F) 

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SYSTEM MAINTENANCE OUTLINE
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
forwarding 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...

NDA-24307 CHAPTER 2
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SYSTEM MAINTENANCE OUTLINE
Figure 2-35   Circuit Card Version Number, Program Name, and Program Package Version Number
PA-
16LCBE
SPA-
16LCBE
SP 785
A 6A
Front Program Package
Version NumberProgram Name Circuit Card Name9A  91-03
TR 5448
Right View of Circuit Card
Circuit Card Version Number 

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SYSTEM MAINTENANCE OUTLINE
4.2 Forwarding Faulty Circuit Card Method
Send the faulty circuit card to the NEC agent to whom a request is made for a replacement card. Adhere
to the following procedure for sending the faulty circuit card:
(1) Insert connector covers onto the circuit card terminals.
(2) Put the circuit card into a static electricity protective bag.
(3) Pack the circuit card with air cap, etc.
(4) Set the circuit card into the cardboard box for that...

NDA-24307 CHAPTER 3
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CHAPTER 3 SYSTEM MESSAGES
This chapter explains how to read and analyze system messages displayed during routine diagnosis, system op-
eration status controlling, and occurrence of a fault within the system. Table 3-1 provides a list of system mes-
sages.
Table 3-1  List of System Messages 
MESSAGE NO.  SYSTEM MESSAGE PAGE
0-C Reset Interrupt 56
0-D CPU Clock Down 58
0-E C-Level Infinite Loop 59
0-F Memory Failure 61
0-G B-Level Infinite Loop (Permanent) 63
0-H B-Level...

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SYSTEM MESSAGES
1-Y LN Æ ISW CLK/FH Failure (Both) 93
1-Z LN Æ ISW CLK/FH Release 95
2-T AP-INT Data Transfer Failure (Permanent) Note 1-
2-U AP-INT Data Transfer Failure (Temporary) Note 1-
2-V IP Data Transfer Failure (Permanent) Note 1-
2-W IP Data Transfer Failure (Temporary) Note 1-
3-B C-Level Infinite Loop (Permanent) 97
3-C C-Level Infinite Loop (Temporary) 98
3-D Lock-Up Failure (Permanent) 99
3-E Lock-Up Failure (Temporary) 100
3-F -48V Over Current 101
3-G...