NEC Neax 2400 Imx System Operations And Maintenance Manual

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FAULT REPAIR PROCEDURES
4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over
Faulty Situation:
 The ACT side has become faulty and the system changeover has executed in the
dual configuration system.
[4-S] MUX Ready Failure / [4-T] Both MUX Failure
[23-Y] MUX Clock Failure
Check to see if the MUX (PH-PC36)
circuit card of the STBY side is making
poor contact.
If the connection is set up, set the
faulty system into STBY side.Set the MB...

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Replace the MUX circuit card with a
spare, and check it.Replace the MUX circuit card referring to
Section 3.3.2, MUX Card Replacement
Procedure in Chapter 4.
Place the MUX circuit card into ACT mode 
by flipping the MBR key on the active GT 
(PH-GT09) card. Refer to Section 12.1.6, 
Manual System Changeover of Speech Path 
System, in Chapter 6.
Check to see if a station-to-station connection
can be set up and identify a circuit card...

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FAULT REPAIR PROCEDURES
5. SPEECH PATH (TSW) SYSTEM FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-7 has occurred in the
whole system.
5.1 Check Point
When repairing a speech path fault, consider that when any of the faults shown in Ta b l e  5 - 7 have occurred
in the system, it is possible that the TSW circuit card is at fault. Always check the alarm lamps on the
TSW circuit card.
Table 5-7  Speech Path (TSW)...

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FAULT REPAIR PROCEDURES
Figure 5-8   Speech Path Block Diagram
IMG0
TSW
02
To IMG2
TSWM
TSW 00
TSW/INTMUX 003
MUX 002
MUX 001
MUX 000
PIM 3
LC/TRK
MUX
Symbols
          :  Speech Path 
          :  Circuit Card (active)
TSW:  PH-SW12
MUX:  PH-PC36 
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
IMG1
PIM 3
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX...

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FAULT REPAIR PROCEDURES
Figure 5-8  Speech Path Block Diagram (Continued)
IMG2
TSW
00
To IMG0
TSWM
TSW 02
TSW/INTMUX 023
MUX 022
MUX 021
MUX 020
PIM 3
LC/TRK
MUX
Symbols
          :  Speech Path 
          :  Circuit Card (Active)
TSW:  PH-SW12
MUX:  PH-PC36 
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
IMG3
PIM 3
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK...

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5.2 Speech Path System Fault - Fault Related to Speech
Faulty Situation:
 Fault related to speech such as noise, one-way speech, no-speed, etc. occurs.
 Even if dialing started, Dial Tone (DT) does not stop.
[1-C] Both TSW Write Failure
[1-D] TSW Write Failure
(1) For Dual Configuration
Check to see if fault occurs by extracting
TSW circuit cards one by one.Replace the TSW circuit card referring to
Section 2.3.2, TSW Card Replacement...

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FAULT REPAIR PROCEDURES
Check to see if a station-to-station connection
can be set up and identify a circuit card respon-
sible for the fault.
Perform the above check by extracting the
MUX circuit cards individually.
When the PLO (PH-CK16/17/16-A/17-A)
circuit card is mounted for digital interface,
replace PLO circuit card with a spare and
check.Set MB switch of the PLO circuit card to UP
side.
Confirm OPE lamp on the PLO circuit card of
the mate system...

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(2) For Single Configuration
Check to see if the fault occurs by
extracting TSW circuit cards one by one.Replace the TSW circuit card referring to
Section 2.3.2, TSW Card Replacement
Procedure, in Chapter 4.
Check to see if a station-to-station connection
can be set up and identify a TSW circuit card
responsible for the fault.
Perform the above check by extracting the TSW
circuit cards individually.
Check to see if the fault occurs by...

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FAULT REPAIR PROCEDURES
When the PLO (PH-CK16/17) circuit card
is mounted for digital interface, replace
the PLO circuit card with a spare and
check it.Set MB switch of the PLO circuit card to UP
side.
Confirm ACT lamp on the PLO circuit card
goes out.
Extract PLO circuit card from its mounting
slot.
Set MB switch UP and insert the new PLO
circuit card into its mounting slot.
Set MB switch DOWN.
Confirm the ACT lamp on the new PLO
circuit card illuminates....

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5.3 Speech Path System Fault - When Dial Tone (DT) Cannot Be Heard
Faulty Situation:
 Dial Tone (DT) cannot be heard.
[1-A] Both TSW Failure (Permanent)
[1-E] Both TSW Clock Failure
[4-C] Both TSW Ready Failure
[23-Y] MUX Clock Failure
Note:For dual system configuration, if a system message indicates that both systems are faulty, first repair
the fault in the indicated system and then proceed to repair the PIM in the other system....