NEC Neax 2400 Ipx System Operations And Maintenance Manual
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![Page 457
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](http://img.usermanuals.tech/thumb/54/84234/w64_nec-ipx-system-op-and-maint-ipx-u-type_d-456.png "Page 457
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")
NDA-24307 CHAPTER 5 Page 433 Issue 1 FAULT REPAIR PROCEDURES 10. FAN UNIT FAULT This section explains the fault repair procedure where a fan in the Fan Unit (FANU) does not operate. 10.1 Check Point (1) When repairing a FANU fault, exercise care about the following conditions. The fans (a total of 3) are activated by operating the PWR SW key located on the PZ-M369. The conditions for starting the fan are as follows: With PWR SW key for the fan set to ON position: Always operating With PWR SW key for the fan set to AUTO position: Starts operating if the in-frame temperature is higher than 40°C (104°F); stops operating at temperatures lower than 32°C (90°F). See Figure 5-21. (2) When replacing the FANU with a spare, refer to Section 4, Chapter 4.
CHAPTER 5 NDA-24307 Page 434 Issue 1 FAULT REPAIR PROCEDURES 10.2 Fan Unit Fault Set the PWR SW key on the PZ-M369 to the ON position. When the fan spins Set PWR SW key to AUTO position, and short the thermal relay of the thermal unit. If the fan does not operateCheck the connector cable between the FANU and the thermal unit. If the fan operates Replace thermal relay with a spare. Disconnect the fan connector of the cable for the thermal unit. Replace thermal relay with a spare. Connect the fan connector. If the fan does not operate Check the voltage (DC -48 V) at connectors FC0 through FC2. If the voltage is less than -48 VCheck the connector cable (fan connector) between the FANU and the PIM. If the voltage is -48 V Replace the fan with a spare. Refer to Section 4, Chapter 4. After the fault is corrected, set PWR SW key to the AUTO position. If the fans are to continue operating constantly, set PWR SW key to the ON position. START END
NDA-24307 CHAPTER 5 Page 435 Issue 1 FAULT REPAIR PROCEDURES Figure 5-21 Circuit Diagram of Fan Unit and Thermal Unit FAN 0FAN 1FAN 2 Power Filter Fan Unit FC0 FC1 FC2 POW RLFUSE ALM -48V G FEFUSE FAN1 3 4 2 To PIM/ ON OFF AUTO rl F FAN START Switch Thermal Unit Thermal Relay 32 o C 89o F Thermal Relay 40 o C 104o F Thermal Relay 70 o C 158o F Thermal Relay 60 o C 140o F RL rl GFEFA LM FAN N P -48V EMNMJ rl To PIM To Display Section of TOPU ISWM
CHAPTER 5 NDA-24307 Page 436 Issue 1 FAULT REPAIR PROCEDURES 11. TONE FAULT This section explains the fault repair procedure when any of the various tones cannot be heard in the whole system. 11.1 Check Point When repairing a tone fault, consider that the tone generator circuit is equipped in the TSW circuit card and supplies tone. Check the alarm lamps of the TSW circuit card. Figure 5-22 shows an example of the related trunking for dial tone connection. Figure 5-22 Dial Tone Connection TSW DT LC Dial Tone ORT
NDA-24307 CHAPTER 5 Page 437 Issue 1 FAULT REPAIR PROCEDURES 11.2 Tone Fault Replace the TSW circuit card with a spare and check. When only Hold Tone is faulty. If External Hold Tone source is in use.Check the external equipment which sends out hold tone. Check cross connections on the MDF. Figure 5- 23 shows a block diagram of external hold tone supply (optional). Replace the PLO circuit card with a spare.Set the MB switch of the PLO circuit card to UP side and extract the circuit card from its mounting slot. Make necessary switch settings on the new circuit card, referring to the card extracted. Set the MB switch of the new circuit card UP and insert the circuit card into its mounting slot. Set the MB switch DOWN. Initialize the system and confirm the tone. ATTENTIONContents Static Sensitive Handling Precautions Required START END
CHAPTER 5 NDA-24307
Page 438
Issue 1
FAULT REPAIR PROCEDURES
Figure 5-23 External Hold Tone Supply Block Diagram
External
Tone
Source
(Option)
To MUSIC
connector
for the EMA
card (IMG0)
MDFNote 2
PLO 1TSW 00TSW 10TSW 03TSW 13TSW 02TSW 12TSW 01TSW 11
TSWM0 PIM 0 PIM 2 PIM 3
PIM 1
CLK 0CLK 1TSW 00TSW 10TSW 03TSW 13TSW 02TSW 12TSW 01TSW 11
TSWM1 PIM 0 PIM 2 PIM 3
PIM 1
This figure shows a block diagram of external hold tone supply (optional) in each Local Node (LN0 - LN3). Note 1
- Symbols -
: Circuit Card TSW: PH-SW12 PLO: PH-CK16-A CLK: PH-CK18 EMA: PH-PC40
: CHAMP connector-ended cable
EMAFH
PLOCLK0
EXCLK0
PLOCLK1PLOCLK1
IMG1 IMG2
: Backplane connectors
ISW-LN PLO CA-A CablePLO-CLK CA-A Cable
MelodyPLO 0PLOCLK0Melody
IC
Note 1:External hold tone is supplied to the PLO of local nodes only (all LN0-LN3 except ISW)
Note 2:Multiple connection is provided on the MDF also between PLO No. 0 and No. 1 systems.
NDA-24307 CHAPTER 5 Page 439 Issue 1 FAULT REPAIR PROCEDURES 12. SYSTEM DOWN FAULT This section explains the fault repair procedure when both the CPU and TSW systems are faulty. Figure 5-24 shows the sequence of repair for system down fault. Figure 5-24 System Down Fault Repair Sequence When cause for the fault cannot be identified: Section 12.1When faulty circuit cards can be assumed from system message: Section 12.2 Check power supply. Minimize system configuration. Execute system initialization and see if the mode becomes ON-LINE.Replace doubtful circuit card with a spare.
CHAPTER 5 NDA-24307 Page 440 Issue 1 FAULT REPAIR PROCEDURES 12.1 When Cause for Fault Cannot Be Identified Check power supply circuits. Check voltage (DC: -48 V ±5 V) at LOAD side of the rectifier. Confirm that NFB (circuit breaker) on all PWR supplies is at ON position (UP side). Check to see if there is any PWR supply to which the alarm lamp illuminates. System Initialization by loading office data and program data from the hard disk (Refer to Section 12, Chapter 6.) Service connections such as station-to-station connection cannot be set up.See “Check by Minimizing the System Configuration” on the next page. Service connections such as station-to-station connection can be set up.The data in the memory has been temporarily destroyed. Observe the situation for a while. START END
NDA-24307 CHAPTER 5 Page 441 Issue 1 FAULT REPAIR PROCEDURES (1) Check by minimizing the system configuration Mount only the basic circuit cards in CPU No. 0 system and initialize.Remove all circuit cards from CPU No. 0 system except the basic circuit cards. The circuit cards to be mounted are as follows: •LN CPU, EMA, GT, TSW, MUX •ISW CPU, EMA, IOGT, TSW, HSW On the CPU Display Panel (DSP), set its SENSE switch to “1.” Press Reset (RST) button on the DSP. CPU OPE lamp should be illuminated on the DSP. Initialization cannot be made. Check by replacing the basic circuit cards individually. Set MB switch of the circuit card UP and extract the circuit card from its mounting slot. Make necessary switch settings on the new circuit card. Set MB switch of the new circuit card UP and insert the circuit card into its mounting slot. Set MB switch DOWN. On the DSP (CPU), set SENSE switch to “1.” Press RST button on the DSP. CPU OPE lamp should illuminate on the DSP. If CPU OPE lamp of the DSP does not illuminate, replace next circuit card and check it. (Repeat the above steps for all basic circuit cards.) A
CHAPTER 5 NDA-24307 Page 442 Issue 1 FAULT REPAIR PROCEDURES Initialize by loading the office data and Pro- gram Data from hard disk using command “MEM_HDD.”Set SYSTEM DATA key on the TOPU to LOAD position Using “MEM_HDD,” load the office data and Program Data from the Hard Disk into the data memory. Confirm the SENSE switch is set at “2” on the DSP (CPU). Press RST on the DSP. Confirm OPE lamp illuminates on each basic circuit card. Insert removed control circuit cards of CPU No. 0 and line/trunk circuit cards into their slots and see if a fault occurs.Set MB switch of the circuit card UP and insert it into its mounting slot. (Repeat this for all the cir- cuit cards.) Set MB switch DOWN and see if a fault occurs. Insert control circuit cards of CPU No. 1 system into their mounting slots, and see if a fault occurs.Insert the following control circuit cards of CPU No. 1 system. •LN CPU, EMA, GT, TSW, MUX •ISW CPU, EMA, IOGT, TSW, HSW Set MB switch of the circuit card UP and insert the circuit card into its mounting slot. (Repeat this for all the circuit cards.) After the fault repair, mount all the circuit cards into their mounting slots and execute system initialization. Refer to Section 12, Section 6.Set MB switch DOWN and see if a fault occurs. Confirm that service connections such as Station to Station Connection can be set up between LNs. A END