NEC Neax 2400 Ipx System Operations And Maintenance Manual
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NDA-24307 CHAPTER 5 Page 383 Issue 1 FAULT REPAIR PROCEDURES 3.3 ATTCON/DESKCON Fault Note:No speech can be made. While replacement of the ATI circuit card for the master ATTCON/DESKCON is in progress, the system is placed under Night Mode. On the ATTCON/DESKCON, Lamp Check (LCHK) key has been pressed but no lamps have illuminated.Check the ATT connector cable between the ATTCON/DESKCON and the PBX. When OPE lamp of the ATI (PA-CS33) circuit card does not illuminateCheck to see if MB switch of the ATI circuit card is at ON position (UP side). Use ATRK command to confirm that the trunk data in the ATI circuit card are assigned. Replace the ATI circuit card with a spare. When BL lamp of the ATI circuit card is flashing or illuminatingCheck to see if MB switch of the ATI circuit card is at ON position (UP side). Use MBTK command to see if ATI circuit card is placed into MB state. Use ATRK command to check ATI data assignment. Replace the ATI circuit card with a spare. When keys cannot be operated Replace the operators headset. Replace the ATI circuit card with a spare. AT T E N T I O NContents Static Sensitive Handling Precautions Required START END
CHAPTER 5 NDA-24307 Page 384 Issue 1 FAULT REPAIR PROCEDURES Note: No operations can be made. Replace the ATTCON/DESKCON with a spare.Set the MB switch of ATI PA-CS33 circuit card UP. If the circuit card is equipped with a fuse, remove the fuse. Disconnect the CHAMP connector of the ATTCON/DESKCON and replace the ATTCON/DESKCON. If the circuit card is equipped with a fuse, insert the fuse into its position. Set the MB switch of the ATI circuit card DOWN. Confirm the PA lamp illuminates on the ATTCON/DESKCON. AT T E N T I O NContents Static Sensitive Handling Precautions Required START END
NDA-24307 CHAPTER 5
Page 385
Issue 1
FAULT REPAIR PROCEDURES
4. UNIT FAULT
This section explains the fault repair procedure in a case where any of the faults shown in Table 5-6, has
occurred to all the line/trunk circuit cards mounted in a specific unit. Figure 5-4 shows the range of units.
Figure 5-4 Range of Units (LN0/1/2/3)Table 5-6 Unit Fault Situation
FAULT SITUATION REFERENCE SECTION
Noise, one-way speech, no tone.
Even if dialing has been made, dial tone does not stop.Section 4.2, Unit Fault - Fault Related to Speech
Dial Tone cannot be heard.Section 4.3, Unit Fault - When Dial Tone (DT)
Cannot Be Heard
The MUX card has become faulty and, as a result the CPU has been
changed over.Section 4.4, Unit Fault - ACT-Side MUX Card Is
Faulty and System Has Changed Over
FRONT VIEW
TOPU
IMG0
FANU
BASEULPM
MG01
MG00
TOPU
IMG2
FANU
BASEU TSWM1
Unit 2 Unit 3
Unit 0
Unit 1
MG05
MG04
TOPU
IMG3
FANU
BASEU DUMMY
Unit 2 Unit 3
Unit 0
Unit 1
MG07
MG06
TOPU
IMG1
FANU
BASEUTSWM0
MG03
MG02
PIM3
PIM2
PIM1
PIM0
00
MUX (PH-PC36) 0 MUX (PH-PC36) 1
PWRPWR
Unit No. = 0/2 Unit No. = 1/3
Slot No.
PIM
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Unit 2 Unit 3
Unit 0
Unit 1 Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1 Unit 2
Unit 3
Unit 0
Unit 1 Unit 2
Unit 3
Unit 0
Unit 1 Unit 2
Unit 3
Unit 0
Unit 1
LN0/1/2/3
CHAPTER 5 NDA-24307 Page 386 Issue 1 FAULT REPAIR PROCEDURES 4.1 Check Point When repairing a unit fault, consider the following items: (1) Speech paths and control paths in the unit are connected to line/trunks via the MUX circuit cards. Be sure to check the alarm lamps on the MUX circuit cards, and check to see if the front cable between each MUX circuit card and TSW circuit card is connected correctly. Figure 5-5 and Figure 5-6 show the block diagram within the unit. (2) The MUX circuit cards are operating in the ACT/STBY modes under control of the CPU circuit. When the ACT-side CPU has detected a fault in the ACT-side MUX circuit card, CPU changeover is executed and the ACT/STBY mode of the Speech Path System is also changed over. When both of the MUX circuit cards have become faulty, all the lines/trunks in that unit are placed into make-busy state. (If a PFT circuit card is located in that specific unit, the PFT is activated.) Figure 5-7 shows the location of the MUX cards. (3) When both units in a specific PIM are faulty, it is possible that the PWR circuit card mounted in that specific PIM is faulty. In such a case, refer to Section 9, Power Supply Fault. Figure 5-5 Unit Control Block Diagram (Dual Configuration) MUX0 Clock (B) (A) Speech Path To TSW/INT MUX1 LC/TRK LC/TRK PM Line/ Trunk Circuit Card Control of CPU No. 0 ACT/STBY of CPU No. 0Clock (B) Speech Path (A)To TSW/INT Control of CPU No. 1 ACT/STBY of CPU No. 1 SYMBOLS : Circuit Card : Control on ACT/STBY of Speech Path Systems : Control on ACT/STBY of Clock Systems (A) (B)
NDA-24307 CHAPTER 5 Page 387 Issue 1 FAULT REPAIR PROCEDURES Figure 5-6 Unit Control Block Diagram (Single Configuration) Figure 5-7 MUX Card Locations (LN0/1/2/3) LC/TRK LC/TRK PM Line/ Trunk Circuit Card MUX X To TSW/Clock Speech Path (A) Control of CPU MUX MUX (PH-PC36) card is mounted in Slot No. 13 and/or 14 of each PIM. MUX 0MUX 1UNIT = 2 UNIT = 3 PIM 3 13 IMG0/1/2/3 Front View14 MUX 0MUX 1UNIT = 0 UNIT = 1 PIM 213 14 MUX 0MUX 1UNIT = 2 UNIT = 3 PIM 113 14 MUX 0MUX 1UNIT = 0 UNIT = 1 PIM 013 14
CHAPTER 5 NDA-24307 Page 388 Issue 1 FAULT REPAIR PROCEDURES 4.2 Unit Fault - Fault Related to Speech Faulty Situation: Noise, one-way speech, no tone, etc. occurs only within a unit. Even if dialing has started, dial tone does not stop. (1) For Dual Configuration Check by replacing the MUX (PH-PC36) circuit card.Replace the MUX circuit card referring to Section 3.3.2, MUX Card Replacement Procedure, Chapter 4. After replacement of the MUX circuit card, make a station-to- station call in the faulty unit and see if speech is normal.Place the MUX circuit card into ACT mode. Refer to Section 12, Chapter 6. Check by replacing the TSW circuit card. Replace the TSW circuit card by referring to Section 2.3.2, TSW Card Replacement Procedure, Chapter 4. After replacement of the TSW circuit card, make a station-to- station call in the faulty unit and see if speech is normal.Place the TSW circuit card into ACT mode. Refer to Section 12, Chapter 6. AT T E N T I O NContents Static Sensitive Handling Precautions Required START A
NDA-24307 CHAPTER 5 Page 389 Issue 1 FAULT REPAIR PROCEDURES Check the line/trunk circuit cards mounted in the unit to see if t ey are faulty. Perform this check on an individual basis.Set the MB switch of the line/trunk circuit card UP and extract it from its mounting slot. Make a station-to-station call and see if a fault occurs. If the fault has stopped occurring, the circuit card extracted at that time is faulty. Replace the circuit card with a spare. If the fault continues, check the next circuit card. ATTENTIONContents Static Sensitive Handling Precautions Required A END
CHAPTER 5 NDA-24307 Page 390 Issue 1 FAULT REPAIR PROCEDURES (2) For Single Configuration Check by replacing the MUX (PH-PC36) circuit card.Replace the MUX circuit card by referring to Section 3.3.2, MUX Card Replacement Procedure, Chapter 4. After replacement of the MUX circuit card, make a station-to- station call in the faulty unit and see if speech is normal. Check by replacing the TSW circuit card. Replace the TSW circuit card referring to Section 2.3.2, TSW Card Replacement Procedure, Chapter 4. After replacement of the TSW circuit card, make a station-to- station call in the faulty unit and see if speech is normal.. AT T E N T I O NContents Static Sensitive Handling Precautions Required START A
NDA-24307 CHAPTER 5 Page 391 Issue 1 FAULT REPAIR PROCEDURES Check the line/trunk circuit cards mounted in the unit to see if they are faulty. Perform this check on an individual basis.Set the MB switch of the line/trunk circuit card UP and extract it from its mounting slot. Make a station-to-station call and see if a fault occurs. If the fault has stopped, the circuit card extracted at that time is faulty. Replace the circuit card with a spare. If the fault continues, check the next circuit card. ATTENTIONContents Static Sensitive Handling Precautions Required A END
CHAPTER 5 NDA-24307 Page 392 Issue 1 FAULT REPAIR PROCEDURES 4.3 Unit Fault - When Dial Tone (DT) Cannot Be Heard Faulty Situation: Dial Tone (DT) cannot be heard except within a unit. [4-T] Both MUX Failure / [4-S] MUX Ready Failure [23-Y] MUX Clock Failure Note:For dual system configuration, if a system message indicates that both systems are faulty, first repair the fault in the indicated system and then proceed to repair the PIM in the other system. (1) For Dual Configuration Check to see if the MUX (PH-PC36) circuit card is making poor contact.Set the faulty MUX circuit card into STBY mode. Refer to Section 12, Chapter 6. Set the MB switch of the MUX circuit card UP. Extract the MUX 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 MB switch of the MUX circuit card UP and insert the circuit card into its mounting slot. Set the MB switch of the MUX circuit card DOWN. Check to see if a station-to-station connection can be set up within the faulty unit. Check by replacing the MUX circuit card with a spare.Place the faulty MUX circuit card into STBY mode. Refer to Refer to Section 12, Chapter 6. Replace the MUX circuit card. Refer to Section 3.3.2, MUX Card Replacement Procedure, Chapter 4. ATTENTIONContents Static Sensitive Handling Precautions Required START A B