NEC Neax 2400 Ipx System Operations And Maintenance Manual

							NDA-24307 CHAPTER 5
Page 393
Issue 1
FAULT REPAIR PROCEDURES
Place the MUX circuit card into ACT mode.
Refer to Section 12, Chapter 6.
Check to see if a station-to-station connection
can be set up to identify the circuit card
responsible for the fault.
Extract all the line/trunk circuit cards from
their mounting slots in the unit. Insert the
cards back into their slots one after another
and see if the dial tone is heard each time.Extract all the line/trunk circuit cards from their
slots.
Note:Set the MB switch of the line/trunk
circuit card UP and extract.
Confirm the MUX ACT lamp on the MUX
circuit card illuminates.
Set the MB switch of an extracted line/trunk
circuit card UP and insert the circuit cards into
their mounting slots one by one.
Confirm the OPE lamp of the inserted circuit
card illuminates by setting the MB switch
DOWN. If Dial Tone (DT) is heard, check
the next circuit card.
Make a station-to-station call and see if DT can
be heard. 
Note:Perform this check on the rest of the
circuit cards by inserting them into
their slots individually. If DT is not heard, replace the
circuit card with a spare.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
ENDB 
						

							CHAPTER 5 NDA-24307
Page 394
Issue 1
FAULT REPAIR PROCEDURES
(2) For Single Configuration
Check to see if the MUX (PH-PC36)
circuit card is making poor contact.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.
Check to see if a station-to-station connection
can be set up within the faulty unit.
Check by replacing the MUX circuit card
with a spare.Replace the MUX circuit card referring to Sec-
tion 3.3.2, MUX Card Replacement Procedure,
Chapter 4.
Place the MUX circuit card into ACT mode.
Refer to Section 12, Chapter 6.
Check to see if a station-to-station connection
can be set up to identify a circuit card
responsible for the fault.
AT T E N T I O NContents
Static Sensitive
Handling
Precautions Required
START
A 
						

							NDA-24307 CHAPTER 5
Page 395
Issue 1
FAULT REPAIR PROCEDURES
Extract all the line/trunk circuit cards from
their mounting slots in the unit. Insert the
cards back into their slots one after
another and see if the dial tone is heard
each time.Extract all the line/trunk circuit cards from
their slots. 
Note:Set the MB switch of the line/trunk
circuit card UP and extract.
Confirm the MUX ACT lamp on the MUX
circuit card illuminates.
Set the MB switch of an extracted Line/Trunk
circuit card UP and insert the circuit cards
into their mounting slots one by one.
Confirm the OPE lamp of the inserted circuit
card illuminates by setting the MB switch
DOWN.
Make a station-to-station call and see if DT is
heard. 
Note:Perform this check on the reset of
the circuit cards by inserting them
into their slots individually. If DT is heard, check the next
circuit card.
If DT is not heard, replace the
circuit card with a spare.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
END 
						

							CHAPTER 5 NDA-24307
Page 396
Issue 1
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.
Refer to Section 12, Chapter 6.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. Refer to 
Section 12, 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-24307 CHAPTER 5
Page 397
Issue 1
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, Chapter 4.
Place the MUX circuit card into ACT mode. 
Refer to Section 12, 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. Refer to Section 12,
Chapter 6.Perform the above check by extracting each
MUX circuit card individually.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
END 
						

							CHAPTER 5 NDA-24307
Page 398
Issue 1
FAULT REPAIR PROCEDURES
5. SPEECH PATH (TSW) SYSTEM FAULT (LN)
This paragraph explains the fault repair procedure when any of the faults shown in Ta b l e  5 - 7 has occurred in
a LN.
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 a LN, it is possible that the TSW circuit card is at fault. Always check the alarm lamps on the TSW
circuit card. Refer to Figure 5-8.
Table 5-7  Speech Path (TSW) System Fault Situation (LN)
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 (LN) - STBY 
Side Has Become Faulty 
						

							NDA-24307 CHAPTER 5
Page 399
Issue 1
FAULT REPAIR PROCEDURES
Figure 5-8   Speech Path Block Diagram (1/2)
ISWM
MUXMUXLC/TRKPIM0
IMG0 of LN0
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG1 of LN0
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG2 of LN0
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG3 of LN0
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
- Symbols -
:  Cable:  Circuit card (ACT)
:  Circuit card (ST-BY)
:  Speech Path
TSW (in TSWM0/1) :  PH-SW12 TSW (in ISWM) :  PU-SW00
HSW:  PU-SW01
MUX:  PH-PC36
T
S
W
TSW/INT
TSW 00
T
S
W
00000100200300400500600700800900A00B00C00D00E00F
T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INT
TSW 10
T
S
W
10010110210310410510610710810910A10B10C10D10E10F
T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
W
HSW
T
S
W
TSW/INT
TSW 01
T
S
W
01001101201301401501601701801901A01B01C01D01E01F
T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INT
TSW 11
T
S
W
11011111211311411511611711811911A11B11C11D11E11F
T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
W
TSW/INTTSW/INT
TSW/INT
00800900A00B
00C00D00E00F
TSWM 0
  ( LN0)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
XTSW/INT
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
10810910A10B
10C10D10E10F
TSWM 1
  ( LN0)M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
00800900A
00B 00C00D00E00F
10810910A10B
10C10D10E10F
MUXMUXLC/TRKPIM0
IMG0 of LN1
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG1 of LN1
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG2 of LN1
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG3 of LN1
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
TSWM 0
  ( LN1)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
XTSW/INT
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13TSW/INTTSW/INT
TSW/INT TSW/INT
TSW/INTTSW/INT
TSW/INT
000 001002003 004005006007
00800900A00B
00C00D00E00F104105106107
100101102103
10810910A10B
10C10D10E10F
TSWM 1
  ( LN1)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
00800900A00B
00C00D00E00F 10810910A10B
10C10D10E10F
HSW
T
S
W
TSW/INTTSW 02
T
S
W02002102202302402502602702802902A02B02C02D02E02FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 12
T
S
W12012112212312412512612712812912A12B12C12D12E12FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 03
T
S
W03003103203303403503603703803903A03B03C03D03E03FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 13
T
S
W13013113213313413513613713813913A13B13C13D13E13FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
W
To TSWM0
    of LN2To TSWM1
    of LN2To TSWM0
    of LN3To TSWM1
    of LN3To TSWM0
    of LN2To TSWM1
    of LN2To TSWM0
    of LN3To TSWM1
    of LN3
This figure shows a block diagram of speech path. 
						

							CHAPTER 5 NDA-24307
Page 400
Issue 1
FAULT REPAIR PROCEDURES
Figure 5-8  Speech Path Block Diagram (2/2)
ISWM
MUXMUXLC/TRKPIM0
IMG0 of LN2
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG1 of LN2
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG2 of LN2
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG3 of LN2
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
- Symbols -
:  Cable
:  Circuit card (ACT)
:  Circuit card (ST-BY)
:  Speech Path
TSW (in TSWM0/1) :  PH-SW12 TSW (in ISWM) :  PU-SW00
HSW:  PU-SW01
MUX:  PH-PC36
T
S
W
TSW/INTTSW 02
T
S
W020
021022
023024
025026
027028
02902A
02B02C
02D02E
02FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 12
T
S
W120
121122
123124
125126
127128
12912A
12B12C
12D12E
12FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
W
HSW
T
S
W
TSW/INTTSW 03
T
S
W030
031032
033034
035036
037038
03903A
03B03C
03D03E
03FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 13
T
S
W130
131132
133134
135136
137138
13913A
13B13C
13D13E
13FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
W
TSW/INTTSW/INT
TSW/INT
00800900A00B
00C00D00E00F
TSWM 0
  ( LN2)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
XTSW/INT
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
10810910A10B
10C10D10E10F
TSWM 1
  ( LN2)M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
00800900A
00B 00C00D00E00F
10810910A10B
10C10D10E10F
MUXMUXLC/TRKPIM0
IMG0 of LN3
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG1 of LN3
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG2 of LN3
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
MUXMUXLC/TRKPIM0
IMG3 of LN3
PIM1MUXMUXLC/TRK
PIM2MUXMUXLC/TRK
PIM3MUXMUXLC/TRK
TSWM 0
  ( LN3)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
XTSW/INT
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13TSW/INTTSW/INT
TSW/INT TSW/INT
TSW/INTTSW/INT
TSW/INT
000 001002003 004005006007
00800900A00B
00C00D00E00F104105106107
100101102103
10810910A10B
10C10D10E10F
TSWM 1
  ( LN3)
M
U
X
TSW 00
M
U
XM
U
XM
U
X
TSW02
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 10
M
U
XM
U
XM
U
XM
U
X
TSW 12
M
U
X
TSW 01
M
U
XM
U
XM
U
X
TSW03
M
U
XM
U
XM
U
XM
U
X
M
U
XM
U
XM
U
XM
U
X
TSW 11
M
U
XM
U
XM
U
XM
U
X
TSW 13
TSW/INT
TSW/INTTSW/INT
TSW/INT
TSW/INT
TSW/INTTSW/INT
TSW/INT000001002003 004005006007104105106107
100101102103
00800900A00B
00C00D00E00F 10810910A10B
10C10D10E10F
HSW
T
S
W
TSW/INTTSW 00
T
S
W000001002003 004005006007 00800900A00B 00C00D00E00FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 10
T
S
W100101102103 104105106107 10810910A10B10C10D10E10FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 01
T
S
W010011012013 014015016017 01801901A01B 01C01D01E01FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
W T
S
WT
S
W
TSW/INTTSW 11
T
S
W110111112113 114115116117 11811911A11B11C11D11E11FT
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
S
W T
S
WT
S
W T
S
W T
S
W T
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W T
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W T
S
W
To TSWM0
    of LN0To TSWM1
    of LN0To TSWM0
    of LN1To TSWM1
    of LN1To TSWM0
    of LN0To TSWM1
    of LN0To TSWM0
    of LN1To TSWM1
    of LN1
This figure shows a block diagram of speech path. 
						

							NDA-24307 CHAPTER 5
Page 401
Issue 1
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 replacing
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. 
Refer to Section 12, 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 replacing
MUX circuit cards one by one.Replace the MUX circuit card referring to
Section 3.3.2, MUX Card Replacement
Procedure, Chapter 4.
Place the MUX circuit card into ACT mode. 
Refer to Section 12, Chapter 6.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
AB 
						

							CHAPTER 5 NDA-24307
Page 402
Issue 1
FAULT REPAIR PROCEDURES
Check to see if a station-to-station connection
can be set up and identify a circuit card
responsible for the fault.
Perform the above check by extracting the
MUX circuit cards individually.
When the PLO (PH-CK16-A/17-A)/CLK
(PH-CLK18) circuit card is mounted for
digital interface, replace PLO/CLK circuit
card with a spare and check.Set MB switch of the PLO/CLK circuit card to
UP side.
Confirm OPE lamp on the PLO/CLK circuit
card of the mate system illuminates.
Extract PLO/CLK circuit card from its
mounting slot.
Set MB switch UP and insert the new PLO/
CLK circuit card into its mounting slot.
Set MB switch DOWN.
Set MB switch of the ACT-side PLO/CLK
circuit card UP.
Confirm that the new PLO/CLK circuit card
becomes the ACT side (OPE lamp on the new
card lights green).
Set MB switch of the STBY side PLO/CLK
DOWN.
Confirm that speech can be carried out
normally by a station-to-station call.
Set the faulty speech path system to STBY
side. Refer to Section 12, Chapter 6.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
ENDB