NEC Neax 2400 Imx System Operations And Maintenance Manual

							CHAPTER 5 NDA-24238
Page 344
Revision 3.0
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 switch of the MUX circuit card
UP.
Extract the MUX circuit card from its
mounting slot and clean the contact portion.
If cleaning cannot be done, repeat insertion
and extraction of the circuit card two or three
times.
Set the MB switch of the MUX circuit card
UP and insert the circuit card into its
mounting slot.
Set the MB switch of the MUX circuit card
DOWN.
Set the faulty system to ACT side 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 within the faulty unit.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
A 
						

							NDA-24238 CHAPTER 5
Page 345
Revision 3.0
FAULT REPAIR PROCEDURES
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
responsible for the fault.
If the connection is set up, set
the faulty system into STBY
side.Perform the above check by extracting each
MUX circuit card individually.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
END 
						

							CHAPTER 5 NDA-24238
Page 346
Revision 3.0
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) System Fault Situation
FAULTY SITUATION REFERENCE SECTION
 Noise, one-way speech, no tone
 Even if dialing has been made, dial tone does not stop.Section 5.2, Speech Path System Fault - Fault 
Related to Speech
Dial tone cannot be heard.Section 5.3, Speech Path System Fault - When Dial 
Tone (DT) Cannot Be Heard
A fault occurring in the STBY side TSW is indicated by a system 
message or an alarm lamp.Section 5.4, Speech Path System Fault - STBY Side 
Has Become Faulty 
						

							NDA-24238 CHAPTER 5
Page 347
Revision 3.0
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
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
 :  Circuit Card (STBY)  :  Cable
TSW 01
TSW/INTMUX 013
MUX 012
MUX 011
MUX 010
TSW 10
TSW/INTMUX 100
MUX 101
MUX 102
MUX 103
TSW 11
TSW/INTMUX 110
MUX 111
MUX 112
MUX 113
TSW/
INT
TSW
12
To IMG2
TSW/
INT
TSW
03
To IMG3
TSW/
INT
TSW
13
To IMG3
TSW/
INTLVDS (Low Voltage Differential Signaling) 
						

							CHAPTER 5 NDA-24238
Page 348
Revision 3.0
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
MUX
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
 :  Circuit Card (STBY)  :  Cable
TSW 03
TSW/INTMUX 033
MUX 032
MUX 031
MUX 030
TSW 12
TSW/INTMUX 120
MUX 121
MUX 122
MUX 123
TSW 13
TSW/INTMUX 130
MUX 131
MUX 132
MUX 133
TSW/
INT
TSW
10
To IMG0
TSW/
INT
TSW
01
To IMG1
TSW/
INT
TSW
11
To IMG1
TSW/
INTLVDS (Low Voltage Differential Signaling) 
						

							NDA-24238 CHAPTER 5
Page 349
Revision 3.0
FAULT REPAIR PROCEDURES
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
Procedure, in Chapter 4.
Place the TSW 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 TSW circuit card
responsible for the fault.
Perform the above check by extracting the
TSW circuit cards individually.
Check to see if fault occurs by extracting
MUX circuit cards one by one.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.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
A
B 
						

							CHAPTER 5 NDA-24238
Page 350
Revision 3.0
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 illuminates.
Extract PLO circuit card from its mounting slot.
Set MB switch UP and insert the new PLO cir-
cuit card into its mounting slot.
Set MB switch DOWN.
Set MB switch of the ACT-side PLO circuit
card UP.
Confirm that the new PLO circuit card becomes
the ACT side (OPE lamp on the new card lights
green).
Set MB switch of the STBY side PLO DOWN.
Confirm that speech can be carried out normal-
ly by a station-to-station call.
Set the faulty speech path system to STBY
side 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.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
ENDB 
						

							NDA-24238 CHAPTER 5
Page 351
Revision 3.0
FAULT REPAIR PROCEDURES
(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
extracting MUX circuit cards one by
one.Replace the MUX circuit card referring to
Section 3.3.2, MUX Card Replacement
Procedure, in Chapter 4.
Initialize the system by pressing the START
button on the TOPU.
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.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
A 
						

							CHAPTER 5 NDA-24238
Page 352
Revision 3.0
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.
Confirm that speech can be carried out
normally by a station-to-station call.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
END 
						

							NDA-24238 CHAPTER 5
Page 353
Revision 3.0
FAULT REPAIR PROCEDURES
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.
Check to see if the TSW circuit card is
making poor contact.Set TSW circuit card into STBY mode by flip-
ping 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.
Set TSW MBR switch on the TSW card UP.
Set MB switch of the TSW circuit card UP.
Extract the TSW circuit card from its mounting
slot and clean the contact portion.
If cleaning cannot be done, repeat insertion and
extraction of the circuit card two or three times.
Set TSW MBR and MB switches on the TSW
circuit card UP and insert the circuit card into
its mounting slot.
Set MB switch of the TSW circuit card DOWN.
Set TSW MBR switch DOWN.
Check if a station-to-station connection can be
set up.
Check front cables. Check the front cables. (See Figure 5-8).
Initialize the system by pressing the START
button on the TOPU and see if a station-to-sta-
tion connection can be set up.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
END