NEC Neax 2400 Imx System Operations And Maintenance Manual

							CHAPTER 5 NDA-24238
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Revision 3.0
FAULT REPAIR PROCEDURES
5.4Speech Path System Fault - STBY Side Has Become Faulty
Faulty Situation:
 A fault occurred in the STBY side of the dual configuration system.
[1-B] TSW Failure (Permanent)
[1-D] TSW Write Failure
[1-F] TSW Clock Failure
[4-D] TSW Ready Failure
Check to see if the TSW circuit card is mak-
ing poor contact.Set the TSW MBR switch of the TSW circuit
card UP.
Set the MB switch of the TSW circuit card UP
and extract the circuit card from its mounting
slot.
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 the TSW MBR and MB switches of the
TSW circuit card UP and insert the circuit card
into its mounting slot.
Set the MB switch of the TSW circuit card
DOWN.
Set the TSW MBR switch DOWN.
Check if a station-to-station connection can be
set up.
Check PCM cables. Check the PCM 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
A 
						

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FAULT REPAIR PROCEDURES
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
Check to see if fault occurs by extracting
TSW circuit cards one by one.Replace the TSW circuit card referring to Sec-
tion 2.3.2, TSW Card Replacement Procedure
in Chapter 4.
Set 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.
Initialize the system by pressing the START
button on the TOPU.
Check to see if a station-to-station connection
can be set up to identify a TSW circuit card re-
sponsible 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 Sec-
tion 3.3.2, MUX Card Replacement Procedure,
in Chapter 4.
Set 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 TSW circuit card re-
sponsible for the fault.
Perform the above check by extracting the
MUX circuit cards individually.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
A
END 
						

							CHAPTER 5 NDA-24238
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Revision 3.0
FAULT REPAIR PROCEDURES
6. CONTROL SYSTEM FAULT
This section explains the fault repair procedure for the control system listed in Table 5-8.
6.1 Check Point
When repairing the control system, check the status of the following lamps:
CPR
GT
 TSW
MUX
 EMA circuit cards
Figure 5-9 shows a block diagram of the CPU controlling block, where CPU #0 is active.
Table 5-8  Control System Fault Situation
FAULTY SITUATION REFERENCE SECTION
Fault occurs occasionally at the STBY side.Section 6.2, Control System Fault - Fault Occurs Intermittently
STBY side is faulty.Section 6.3, Control System Fault - STBY Side Is Faulty 
						

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FAULT REPAIR PROCEDURES
Figure 5-9   CPU Controlling Block Diagram
LPM
EMAIOC /
MISC
ISAGT 0
LANI
PWR
PWR
CPU 0
MEMORY
PCI BUSISA BUS
CPU board CPR
CPU clock
   CPR
(ST-BY)
Reset Signal
MISC BUS
MISC BUS
ISAGT 1 T
MT
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG0
PIM 3
PIM 2
PIM 1
PIM 0
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG1
PIM 3
PIM 2
PIM 1
PIM 0
Note 1:  The circuit cards, drawn by dotted lines, indicate they are in STBY state. These cards (TSW, MUX and
               DLKC) are totally  changed over to the ACT mode, when the MBR key of the active GT (PH-GT09) card is 
               once flipped. However, PLO (PH-CK16/17/16-A/17-A) is independent and not affected by the development.
Symbols
          :  Controlling Routes of CPU                         :  Cable
          :  Circuit card (active)                  :  Circuit card (STBY)
            :  External Cable                  :  Clock Oscillator
            :  Signral
EMA:      PH-PC40                      ISAGT:     PZ-GT13
LANI:      PZ-PC19                      GT:           PH-GT09
IOC:        PH-IO24                       TSW:        PH-SW12
DLKC:    PH-PC20                      PLO:        PH-CK16/17/16-A/17-A
MUX:      PH-PC36 
TSWM  
TSW 00TSW 10TSW 11TSW 01
PLO 0PLO 1
DLKC 1DLKC 0DLKC 1
GT 1
GT 0
MISC BUS
MISC BUS
MISC BUS
MISC BUSMISC BUS MISC BUS
TSW
    02TSW 
    03TSW
    13TSW
    12
To IMG 2To IMG 3To IMG 3 To IMG 2
IOP1
IOP0
TSW/INT TSW/INT TSW/INTTSW/INT
M
U
X003
M
U
X002
M
U
X001
M
U
X000
M
U
X013
M
U
X012
M
U
X011
M
U
X010
M
U
X100
M
U
X101
M
U
X102
M
U
X103
M
U
X110
M
U
X111
M
U
X112
M
U
X113
  TSW
   /INT  TSW
   /INT  TSW
   /INT   TSW
   /INT
Note 1
Note 3
Note 2
Note 2:  If the ACT/STBY of CPU is once changed over, the system of GT (in TSWM) also changes over.
Note 3:  Though an external cable is physically connected between ISAGT0 and GT1, the actual control signal is
sent/received only between ISAGT0 and GT0. This is because GT0 and GT1 are having a multiple connection

               on the backboard side. (Refer to Chapter 6, Section 12.)
BUS
TSW I/O BUSTSW I/O  
						

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FAULT REPAIR PROCEDURES
Figure 5-9  CPU Controlling Block Diagram (Continued)
LPM
EMAIOC /
MISC
ISAGT 0
LANI
PWR
PWR
CPU 0
MEMORY
PCI BUSISA BUS
CPU board CPR
CPU clock
   CPR
(ST-BY)
Reset Signal
MISC BUS
MISC BUS
ISAGT 1 T
MT
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG2
PIM 3
PIM 2
PIM 1
PIM 0
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG3
PIM 3
PIM 2
PIM 1
PIM 0
Note 1:  The circuit cards, drawn by dotted lines, indicate they are in STBY state. These cards (TSW, MUX and
               DLKC) are totally  changed over to the ACT mode, when the MBR key of the active GT (PH-GT09) card is 
               once flipped. However, PLO (PH-CK16/17/16-A/17-A) is independent and not affected by the development.
Symbols
          :  Controlling Routes of CPU                    :  Cable
          :  Circuit card (active)              :  Circuit card (STBY)
            :  External Cable                  :  Clock Oscillator
            :  Signral
EMA:      PH-PC40                      ISAGT:     PZ-GT13
LANI:      PZ-PC19                      GT:           PH-GT09
IOC:        PH-IO24                       TSW:        PH-SW12
DLKC:     PH-PC20                      PLO:        PH-CK16/17/16-A/17-A 
MUX:      PH-PC36 
TSWM  
TSW 02TSW 12TSW 13TSW 03
PLO 0PLO 1
DLKC 1DLKC 0DLKC 1
GT 1
GT 0
MISC BUS
MISC BUS
MISC BUS
MISC BUSMISC BUS MISC BUSTSW I/O TSW I/O 
TSW
    00TSW 
    01TSW
    11TSW
    10
To IMG 0To IMG 1To IMG 1 To IMG 0
IOP1
IOP0
TSW/INT TSW/INT TSW/INTTSW/INT
M
U
X023
M
U
X022
M
U
X021
M
U
X020
M
U
X033
M
U
X032
M
U
X031
M
U
X030
M
U
X120
M
U
X121
M
U
X122
M
U
X123
M
U
X130
M
U
X131
M
U
X132
M
U
X133
  TSW
   /INT  TSW
   /INT  TSW
   /INT   TSW
   /INT
Note 1
Note 3
Note 2
Note 2:  If the ACT/STBY of CPU is once changed over, the system of GT (in TSWM) also changes over.
Note 3:  Though an external cable is physically connected between ISAGT0 and GT1, the actual control signal is
sent/received only between ISAGT0 and GT0. This is because GT0 and GT1 are having a multiple connection

               on the backboard side. (Refer to Chapter 6, Section 12.)
BUSBUS
(ST-BY) 
						

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FAULT REPAIR PROCEDURES
6.2 Control System Fault - Fault Occurs Intermittently
Faulty Situation:
 Fault occurs intermittently at ACT side in the dual configuration system.
 Fault occurs intermittently in the single configuration system.
[0-C] ~ [0-K] CPU Failure
[1-C] Both TSW Write Failure
[1-D] TSW Write Failure
[3-D], [3-E] Lock-Up Failure (Permanent/Temporary)
(1) For Dual Configuration
Replace ACT-side related circuit card
(CPU, GT, TSW, MUX, EMA) with a spare,
and check.Replace the circuit cards (CPU, GT, TSW, MUX,
EMA) individually referring to the following sec-
tions in Chapter 4:
Section 1.3.1, CPR Replacement Procedure
Section 1.3.2, EMA Card Replacement
Procedure 
Section 2.3.1, GT Card Replacement
Procedure
Section 2.3.2, TSW Card Replacement
Procedure
Section 3.3.2, MUX Card Replacement
Procedure
Place the circuit card (CPU, GT, TSW, MUX)
into ACT mode individually by executing CPU or
Speech Path System changeover. 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.
After all the steps are complete, place the whole
circuit card (CPU, GT, TSW, MUX examined
above) to the ACT mode. Refer to Section 12.1.6,
Manual System Changeover of Speech Path Sys-
tem, in Chapter 6.
When a fault is not indicated, set the
faulty system to STBY mode. Refer
to Section 12, System Control Pro-
cedures, in Chapter 6.Check to see if a fault is indicated.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
A 
						

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FAULT REPAIR PROCEDURES
(2) For Single Configuration
Replace the related circuit card (CPU, GT,
TSW, MUX, EMA) with a spare, and check.Replace the circuit card (CPU, GT, TSW, MUX, 
EMA) individually by referring to the following 
sections in Chapter 4:
Section 1.3.1, CPR Replacement Procedure
Section 1.3.2, EMA Card Replacement
Procedure
Section 2.3.1, GT Card Replacement
Procedure
Section 2.3.2, TSW Card Replacement
Procedure
Section 3.3.2, MUX Card Replacement
Procedure
Initialize the system by pressing the START
button on the TOPU and check to see if a
station-to-station connection can be set up and
identify a circuit card responsible for the fault.
AT T E N T I O NContents
Static Sensitive
Handling
Precautions Required
A
END 
						

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FAULT REPAIR PROCEDURES
6.3 Control System Fault - STBY Side Is Faulty
Faulty Situation:
 Fault has occurred in the STBY side of dual configuration system.
[0-I] STBY CPU Failure
 The ACT side has become faulty, and system changeover has executed.
[0-C], [0-H], [0-J] Processor Failure (ACT side)
Replace STBY side related circuit cards
(CPU, GT, TSW, MUX, EMA) with a spare,
and check.Replace the circuit cards (CPU, GT, TSW, 
MUX, EMA) individually by referring to the 
following paragraphs in Chapter 4:
Section 1.3.1, CPR Replacement Procedure
Section 1.3.2, EMA Card Replacement
Procedure
Section 2.3.1, GT Card Replacement
Procedure
Section 2.3.2, TSW Card Replacement
Procedure
Section 3.3.2, MUX Card Replacement
Procedure
Place the circuit cards (CPU, GT, TSW, MUX)
into ACT mode by executing CPU changeover.
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 to identify the circuit card
responsible for the fault.
When a fault is not indicated, set 
the faulty systems to STBY side in 
advance by executing CPU 
changeover. Refer to Section 12, 
System Control Procedures, in 
Chapter 6.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
START
END 
						

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FAULT REPAIR PROCEDURES
Figure 5-10   Alarm Bus Cable Connections Diagram
IMG 0
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 3
ALMA
ALMB
DSPLTO P U
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 0
ALMA
ALMB
LED3
LED2
LED1
ALM3
MUSIC
ALM2
ALM1EMA
EMAFH
ALM
ALM
DSP
PA L M 1
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 1
ALMA
ALMB
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 2
ALMA
ALMB
PZ-DK222
IMG 1
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 3
ALMA
ALMB
DSPMTOPU
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 0
ALMA
ALMB
TSWM
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 1
ALMA
ALMB
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 2
ALMA
ALMB
PZ-DK222
EMA
PA L MPWR1LANI 1GT 1
PWR0LANI 0GT 0
PZ-PW92
PZ-PW92
PA L M 0PA L M
- Symbols -
           :  
Alarm related connector                                     :Cable EMA:  PH-PC40                     MUX:  PH-PC36        
          :  Circuit card  :  External Cable              LANI:  PZ-PC19                     ISAGT:  PZ-GT13
LPM (REAR VIEW) LPM (FRONT VIEW) REAR VIEW 
						

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FAULT REPAIR PROCEDURES
Figure 5-10  Alarm Bus Cable Connections Diagram (Continued)
IMG 2
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 3
ALMA
ALMB
DSPM     TOPU
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 0
ALMA
ALMB
LED3
LED2
LED1
ALM3
MUSIC
ALM2
ALM1
DSP
DSP
PA L M 1
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 1
ALMA
ALMB
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 2
ALMA
ALMB
PZ-DK222
IMG 3
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 3
ALMA
ALMB
DSPMTO P U
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 0
ALMA
ALMB
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 1
ALMA
ALMB
MUX 0LC/TRKMUX 1PWR
DPWR
PIM 2
ALMA
ALMB
PZ-DK222
EMA
PA L MPWR1LANI 1GT 1
PWR0LANI 0GT 0
PZ-PW92
PZ-PW92
PA L M 0PA L M
LPM (REAR VIEW) LPM (FRONT VIEW)
- Symbols -
         :  
Alarm related connector                                     :Cable EMA:  PH-PC40                     MUX:  PH-PC36        
          :  Circuit card  :  External Cable              LANI:  PZ-PC19                     ISAGT:  PZ-GT13