NEC Neax 2400 Imx System Operations And Maintenance Manual
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CHAPTER 5 NDA-24238 Page 374 Revision 3.0 FAULT REPAIR PROCEDURES 9. FAN UNIT FAULT This section explains the fault repair procedure where a fan in the Fan Unit (FANU) does not operate. 9.1 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 tempera- ture is higher than 40°C (104°F); stops op- erating at temperatures lower than 32°C (90°F). See Figure 5-19. (2) When replacing the FANU with a spare, refer to Section 4., Fan Unit Replacement, in Chapter 4. Figure 5-19 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
NDA-24238 CHAPTER 5 Page 375 Revision 3.0 FAULT REPAIR PROCEDURES 9.2 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 con- nector) between the FANU and the PIM. If the voltage is -48 V Replace the fan with a spare. Refer to Section 4., Fan Unit Replacement, in 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
CHAPTER 5 NDA-24238 Page 376 Revision 3.0 FAULT REPAIR PROCEDURES 10. TONE FAULT This section explains the fault repair procedure when any of the various tones cannot be heard in the whole system. 10.1 Check Point When repairing a tone fault, consider that the tone generator circuit is equipped in the TSW circuit card and supplies tone. Figure 5-20 shows an example of the related trunking for dial tone connection. Figure 5-20 Dial Tone Connection TSW DT LC Dial Tone ORT
NDA-24238 CHAPTER 5 Page 377 Revision 3.0 FAULT REPAIR PROCEDURES 10.2 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 useCheck the external equipment which sends out hold tone. Check cross connections on the MDF. Figure 5- 21 shows a block diagram of external hold tone supply (optional). Replace the EMA/PLO circuit card with a spare. Note:When system is 1-IMG configuration, replace EMA card. Otherwise, replace PLO card.Set the MB switch of the EMA/PLO circuit card to UP side and extract the circuit card from its mounting slot. 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. Refer to Section 1.3.2, EMA Card Replacement Procedure, in Chapter 4, for detailed instructions.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 WA R N I N G
CHAPTER 5 NDA-24238 Page 378 Revision 3.0 FAULT REPAIR PROCEDURES Figure 5-21 External Hold Tone Supply Block Diagram Note: If PH-CK16-A/PH-CK17-A is used, multiple connections are made between PLO#0 and PLO#1. Refer to the description of PH-CK16-A or PH-CK17-A in the Circuit Card Manual. PLO 1 External Tone Source (Option) To Music Connector for EMA Card (IMG0) MDF TSWM PIM 0 PIM 2 PIM 3 IMG1 PIM 1 Symbols : Circuit Card : Connector Note TSW 10 TSW 00 TSW 11 TSW 01 TSW 12 TSW 02 TSW 13 TSW 03Melody ICPLO 0EMAFH EMA : PH-PC40 PLO : PH-CK16/17/16-A/17-A TSW : PH-SW12 : External Cable
NDA-24238 CHAPTER 5 Page 379 Revision 3.0 FAULT REPAIR PROCEDURES 11. SYSTEM DOWN FAULT This section explains the fault repair procedure when both the CPU and TSW systems are faulty. Figure 5-22 shows the sequence of repair for system down fault. Figure 5-22 System Down Fault Repair Sequence When cause for the fault cannot be identified: Section 11.1When faulty circuit cards can be assumed from system message: Section 11.2 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-24238 Page 380 Revision 3.0 FAULT REPAIR PROCEDURES 11.1 When Cause for Fault Cannot Be Identified Check power supply circuits. Check voltage (DC: -48V, ±5V) 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 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.Data in the memory is temporarily destroyed. Observe the situation for a while. START A
NDA-24238 CHAPTER 5 Page 381 Revision 3.0 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. Circuit cards to be mounted are as follows: CPU, EMA, TSW, MUX (EMA: PH-PC40, TSW: PH-SW12, MUX: PH-PC36) 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 indi- vidually. 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.) END
CHAPTER 5 NDA-24238 Page 382 Revision 3.0 FAULT REPAIR PROCEDURES 11.2 When Faulty Circuit Cards Can Be Assumed From System Message Faulty Situation: When the system is down with message [0-C] ~ [0-J] indicated, faulty circuit cards can be assumed from the message detail data. Replace circuit cards with spares. Replace faulty circuit card with a spare. Set MB switch UP and extract the circuit card from its mounting slot. Make necessary switch settings on the new circuit card. Set the MB switch UP and insert the circuit card into its mounting slot. Set the MB switch DOWN. Initialize the system by loading the office data and program data from the hard disk. Confirm that service connections such as station-to-station connection can be set up. START END
NDA-24238 CHAPTER 5 Page 383 Revision 3.0 FAULT REPAIR PROCEDURES 12. COMMON CHANNEL INTEROFFICE SIGNALING (CCIS) LINE FAULT This section explains the fault repair procedure when any of the faults shown in Table 5-11 occur to a specific CCIS line. 12.1 Check Point When repairing a CCIS Line fault, consider the following items: (1) Check alarm lamps on the CCH or CCT circuit card. (2) Refer to Figure 5-23, and check the cable connection. 12.2 CCIS Line Control The CCH/CCT circuit card controls the signal link (digital) of the interoffice common channel signaling system and transmitting/receiving call processing information. The signal link controls permit normal transmission and reception of call processing information. A break in signal links is detected, then restored to establish signal links. The call processing information is converted into No. 7 signal format for channel 1 (any channel) of the DTI before being transmitted to a distant office. Figure 5-23 shows the CCIS line control route. Figure 5-23 Controlling CCIS Line Table 5-11 CCIS Line Fault Situation FAULTY SITUATION REFERENCE SECTION A specific CCH/CCT card is faulty.Section 12.3, Specific CCH/CCT Card Is Faulty When the signal transmission line is a digital line, transmitting/ receiving of control signals cannot be performed.Section 12.4, Fault of CCH, DTI and Related Flat Cable CPUTSW MUX CCH CCT DTI LT Cable Front CableMDF To CCIS Line LT Cable