NEC Neax 2400 Imx System Operations And Maintenance Manual

CHAPTER 5 NDA-24238
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FAULT REPAIR PROCEDURES
7. ALARM INDICATION FAULT
This section explains the fault repair procedure where any of the faults shown in Table 5-9 occur.
7.1 Check Point
When repairing an alarm indication fault, check the alarm cable route shown in Figure 5-11 and Figure 5-
12.
7.2 Fault of Alarm Indicating Panel
Table 5-9  Alarm Indication Fault Situation
FAULTY SITUATION REFERENCE SECTION
A fault is indicated on the TOPU, but it is not indicated on the Alarm...

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Figure 5-11   Cable Routing for Alarm Indications
Figure 5-12   Cabling Related to Alarm Indicating Panel
A
DSP
A
DSPLAlarm Lamps TOPU
PIM3
PIM2
PIM1
PIM0
LPMEMA
MDF
16PH EXALM CAAlarm
Indicating
Panel
ALMA
ALMB
ALMA
ALMB
A
A
ALMA
ALMB
ALMA
ALM
:  Flat Cable                              :  CHAMP Connector-Ended Cable
:  Connector                              :  To alarm information of PWR, MUX, TSW
:  Circuit Card 
Symbols
A
RPT1
RPT0...

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FAULT REPAIR PROCEDURES
7.3 Fault That Cannot Be Detected
Check the DSP flat cable (See Figure 5-10.).
If the EMA card is removed from the system while the system is in operation under
the control of the CPU #1, the system will reset and stop all call processing. See
Section 1.3.2, EMA Card Replacement Procedure, in Chapter 4 for detailed instructions.
Replace the EMA circuit card with a spare.
Set the MB switch of the EMA circuit card, and extract the circuit...

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FAULT REPAIR PROCEDURES
8. POWER SUPPLY FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-10 occur.
8.1 Check Point
When repairing a power supply fault, consider the following items:
(1) Before checking the system, check the rectifier, battery, and power cables.
(2) The PWR circuit card is equipped with the circuits to supply ringing signal and howler tone. When a fault
occurs that causes the bell of the telephone not...

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Figure 5-14   Block Diagram of Power Supply System (IMG1)
Figure 5-15   Block Diagram of Power Supply System (IMG2/3)
Note:PWR1 is mounted when power supply system is a dual 
system configuration. 
PWR
0
PWR
1LC/TRKLC/TRKMUX0MUX1LC/TRKLC/TRK
PIM3
Note
PWR
0
PWR
1LC/TRKLC/TRKMUX0MUX1LC/TRKLC/TRK
PIM2
Note
PWR
0
PWR
1LC/TRKLC/TRKMUX0MUX1LC/TRKLC/TRK
PIM1
Note
PWR
0
PWR
1LC/TRKLC/TRKMUX0MUX1INT1LC/TRK
PIM0
Note
PWR
0
PWR
1MISC
LPM...

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(4)Figure 5-16 shows the power supply system for PIM.
Figure 5-16   Power Supply to PIM
(5)Figure 5-17 shows the power supply system for LPM.
Figure 5-17   Power Supply to LPM
DC-DC
CONV
RGU
HOW
-48V
NFB
+80V
relRGU
REL PWR0
-48V +80V   Note 
+5V, +12V, -5V
CR (for LC)
HOW (for LC)
-48V (for LC, TRK)
+80V
+80V -48V  DC-DC
CONV
RGU
HOW
-48V
NFB
+80V
relREL PWR1
Note:+80V is for message waiting lamp.
+5V,+12V
(To EMA, MISC, Cards, etc.)...

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FAULT REPAIR PROCEDURES
(6)Figure 5-18 shows the power supply system for TSWM.
Figure 5-18   Power Supply to TSWM
+5V, +12V, +5V
(To MISC Cards)
-48V
(To MISC, GT, TSW, DLKC,PWR1 PWR0
DC-DC
CONV DC-DC
CONV
-48V
+80VREL REL
-48V
+80V -48V -48V
PLO Cards) 

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8.2 Fuse Blown Fault
Check the backplane of the PIM. Make a visual check on the backplane for pin
contacting, melting or burn, etc.
Extract all the circuit cards from the PIM,
and insert them back into their slots
individually to see if the fuse blows.Set the MB switch of the PWR supply UP.
Set the circuit breaker of the PWR supply
DOWN.
Extract all the circuit cards from their mounting
slots, except PWR supply.
Replace the fuse with...

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8.3 Circuit Breaker OFF Fault in PWR Supply
Check the backplane of the PIM. Make a visual check on the backplane for pin
contacting, melting or burning, etc.
Extract all the circuit cards from the PIM, 
and make a visual check of the circuit 
cards.Set MB switch of the PWR supply UP.
Set the circuit breaker of the PWR supply
DOWN.
Extract all circuit cards out of their mounting
slots.
Make a visual check of the extracted circuit
cards....

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8.4 Fault of Alarm Lamps on PWR Supply
Note:Insert each PWR supply with its MB switch to UP side, and then set it back to DOWN side. Press RESET button of the PWR supply.
Alarm lamp goes out.FA U LT  S U P E RV I S I O N
Alarm lamp illuminates again. Set the MB switch on the PWR supply UP.
Turn circuit breaker OFF.
Set MB switch on all the circuit cards, except
PWR supply.
Extract all circuit cards from their mounting
slots.
Turn circuit...