NEC Neax 2400 Ipx System Operations And Maintenance Manual
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NDA-24307 CHAPTER 5 Page 423 Issue 1 FAULT REPAIR PROCEDURES 8.3 Fault That Cannot Be Detected Check the DSP flat cable (See Figure 5-13.). 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, Chapter 4 for detailed instructions. Replace the EMA circuit card with a spare. Set the MB switch of the EMA circuit card UP, and extract the circuit card from its mounting slot. Make necessary switch settings on the new circuit card, referring to the card extracted. Set MB switch UP and insert the circuit card into its mounting slot. Set the MB switch DOWN. Check to see if a fault is detected. ATTENTIONContents Static Sensitive Handling Precautions Required START END WA RN I NG
CHAPTER 5 NDA-24307 Page 424 Issue 1 FAULT REPAIR PROCEDURES 9. POWER SUPPLY FAULT This section explains the fault repair procedure when any of the faults shown in Table 5-12 occur. 9.1 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 to ring, or howler tone cannot be heard, etc., check the alarm lamp on the PWR circuit card. (3)Figure 5-14 through Figure 5-17 show the block diagrams for the power supply to each module. Figure 5-14 Block Diagram of Power Supply System (ISW)Table 5-12 PWR Supply Fault Situation FAULTY SITUATION REFERENCE SECTION Fuse Blown FaultSection 9.2, Fuse Blown Fault Circuit Breaker OFF, Fault in PWR SupplySection 9.3, Circuit Breaker OFF Fault in PWR Supply Fault of Alarm Lamps on PWR SupplySection 9.4, Fault of Alarm Lamps on PWR Supply Note:PWR1 is mounted when power supply system is a dual system configuration. ISWMPWR 0 PWR 1 Note LPMPWR 0 PWR 1MISC Note EMAIOCCPUISAGT0 ISW BASEU LANI0 HSW00HSW01TSW00TSW01TSW02TSW03IOGT0PLO0
NDA-24307 CHAPTER 5 Page 425 Issue 1 FAULT REPAIR PROCEDURES Figure 5-15 Block Diagram of Power Supply System (IMG0) 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/TRKMUX0MUX1LC/TRKLC/TRK PIM0 Note PWR 0 PWR 1 LPM Note CPU0MISC BASEUIMG1/2 (LN0/1/2/3) LANI0ISAGT-0BISAFT-0AIOCEMA
CHAPTER 5 NDA-24307 Page 426 Issue 1 FAULT REPAIR PROCEDURES Figure 5-16 Block Diagram of Power Supply System (IMG1/IMG2) 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/TRKMUX0MUX1LC/TRKLC/TRK PIM0 Note PWR 0 PWR 1MISC LPM Note DLKC0PLO0/CLK0 BASEUIMG1/2 (LN0/1/2/3) TSW03TSW02TSW01TSW00GT0 Note 1:PWR1 is mounted when power supply system is a dual system configuration. Note 2:DLKC is not mounted in TSWM1 of IMG2. Note 3:PLO for IMG1 (TSWM0); CLK for IMG2 (TSWM1)
NDA-24307 CHAPTER 5 Page 427 Issue 1 FAULT REPAIR PROCEDURES Figure 5-17 Block Diagram of Power Supply System (IMG3) 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/TRKMUX0MUX1LC/TRKLC/TRK PIM0 Note DUMMY BASEUIMG3 (LN0/1/2/3)
CHAPTER 5 NDA-24307 Page 428 Issue 1 FAULT REPAIR PROCEDURES (4)Figure 5-18 shows the power supply system for PIM. Figure 5-18 Power Supply to PIM (5)Figure 5-19 shows the power supply system for LPM. Figure 5-19 Power Supply to LPM (LN/ISW) 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 -48 V NFB +80 V relREL PWR1 Note:+80V is for message waiting lamp. +5V,+12V (To EMA, MISC, Cards, etc.) -48V (To EMA, MISC, Cards, etc.)PWR1 PWR0 DC-DC CONV DC-DC CONV -48V +80VREL REL -48V +80V (To CPR 0) -48V (To CPR 1) -48V
NDA-24307 CHAPTER 5 Page 429 Issue 1 FAULT REPAIR PROCEDURES (6)Figure 5-20 shows the power supply system for TSWM/ISWM. Figure 5-20 Power Supply to TSWM/ISWM +5V, +12V, +5V (To MISC Cards) -48VPWR1 PWR0 DC-DC CONV DC-DC CONV -48V +80VREL REL -48V +80V -48V -48V [TSWM] To GT, TSW, DLKC, PLO cards [ISWM] To IOGT, TSW, HSW, PLO cards
CHAPTER 5 NDA-24307 Page 430 Issue 1 FAULT REPAIR PROCEDURES 9.2 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 spare. Set the circuit breaker of the PWR supply UP side. Set the MB switch of the PWR supply DOWN. Insert the circuit cards into their mounting slots individually, with their MB switch to UP side. Check to see if the fuse blows when the MB switch has been set to DOWN. START END
NDA-24307 CHAPTER 5 Page 431 Issue 1 FAULT REPAIR PROCEDURES 9.3 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. Check ICs, resistors, and capacitors to see if any are burned. START END
CHAPTER 5 NDA-24307 Page 432 Issue 1 FAULT REPAIR PROCEDURES 9.4 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 breaker ON. Set the MB switch to DOWN side. Check to see if the alarm lamp illuminates. If the alarm lamp illuminates, replace the PWR supply with a spare. If the alarm lamp does not illuminate, insert the circuit cards into their mounting slot individually to see if the alarm lamp illuminates. START END