NEC Neax 2400 Ipx System Operations And Maintenance Manual
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Page 421
NDA-24307 CHAPTER 5 Page 393 Issue 1 FAULT REPAIR PROCEDURES Place the MUX circuit card into ACT mode. Refer to Section 12, Chapter 6. Check to see if a station-to-station connection can be set up to identify the circuit card responsible for the fault. Extract all the line/trunk circuit cards from their mounting slots in the unit. Insert the cards back into their slots one after another and see if the dial tone is heard each time.Extract all the line/trunk circuit cards from their slots. Note:Set the MB...
Page 422
CHAPTER 5 NDA-24307 Page 394 Issue 1 FAULT REPAIR PROCEDURES (2) For Single Configuration Check to see if the MUX (PH-PC36) circuit card is making poor contact.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...
Page 423
NDA-24307 CHAPTER 5 Page 395 Issue 1 FAULT REPAIR PROCEDURES Extract all the line/trunk circuit cards from their mounting slots in the unit. Insert the cards back into their slots one after another and see if the dial tone is heard each time.Extract all the line/trunk circuit cards from their slots. Note:Set the MB switch of the line/trunk circuit card UP and extract. Confirm the MUX ACT lamp on the MUX circuit card illuminates. Set the MB switch of an extracted Line/Trunk circuit card UP and insert the...
Page 424
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CHAPTER 5 NDA-24307
Page 396
Issue 1
FAULT REPAIR PROCEDURES
4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over
Faulty Situation:
The ACT side has become faulty and the system changeover has executed in the
dual configuration system.
[4-S] MUX Ready Failure / [4-T] Both MUX Failure
[23-Y] MUX Clock Failure
Check to see if the MUX (PH-PC36)
circuit card of the STBY side is making
poor contact.
If the connection is set up, set the
faulty system into STBY side.
Refer to Section 12,...](http://img.usermanuals.tech/thumb/54/84234/w300_nec-ipx-system-op-and-maint-ipx-u-type_d-423.png "Page 424
CHAPTER 5 NDA-24307
Page 396
Issue 1
FAULT REPAIR PROCEDURES
4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over
Faulty Situation:
The ACT side has become faulty and the system changeover has executed in the
dual configuration system.
[4-S] MUX Ready Failure / [4-T] Both MUX Failure
[23-Y] MUX Clock Failure
Check to see if the MUX (PH-PC36)
circuit card of the STBY side is making
poor contact.
If the connection is set up, set the
faulty system into STBY side.
Refer to Section 12,...")
CHAPTER 5 NDA-24307 Page 396 Issue 1 FAULT REPAIR PROCEDURES 4.4 Unit Fault - ACT-Side MUX Card Is Faulty and System Has Changed Over Faulty Situation: The ACT side has become faulty and the system changeover has executed in the dual configuration system. [4-S] MUX Ready Failure / [4-T] Both MUX Failure [23-Y] MUX Clock Failure Check to see if the MUX (PH-PC36) circuit card of the STBY side is making poor contact. If the connection is set up, set the faulty system into STBY side. Refer to Section 12,...
Page 425
NDA-24307 CHAPTER 5 Page 397 Issue 1 FAULT REPAIR PROCEDURES Replace the MUX circuit card with a spare, and check it.Replace the MUX circuit card referring to Section 3.3.2, MUX Card Replacement Procedure, Chapter 4. Place the MUX circuit card into ACT mode. Refer to Section 12, Chapter 6. Check to see if a station-to-station connection can be set up and identify a circuit card responsible for the fault. If the connection is set up, set the faulty system into STBY side. Refer to Section 12, Chapter...
Page 426
CHAPTER 5 NDA-24307 Page 398 Issue 1 FAULT REPAIR PROCEDURES 5. SPEECH PATH (TSW) SYSTEM FAULT (LN) This paragraph explains the fault repair procedure when any of the faults shown in Ta b l e 5 - 7 has occurred in a LN. 5.1 Check Point When repairing a speech path fault, consider that when any of the faults shown in Ta b l e 5 - 7 have occurred in a LN, it is possible that the TSW circuit card is at fault. Always check the alarm lamps on the TSW circuit card. Refer to Figure 5-8. Table 5-7 Speech Path...
Page 427
NDA-24307 CHAPTER 5 Page 399 Issue 1 FAULT REPAIR PROCEDURES Figure 5-8 Speech Path Block Diagram (1/2) ISWM MUXMUXLC/TRKPIM0 IMG0 of LN0 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG1 of LN0 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG2 of LN0 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG3 of LN0 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK - Symbols - : Cable: Circuit card (ACT) : Circuit card (ST-BY) : Speech...
Page 428
CHAPTER 5 NDA-24307 Page 400 Issue 1 FAULT REPAIR PROCEDURES Figure 5-8 Speech Path Block Diagram (2/2) ISWM MUXMUXLC/TRKPIM0 IMG0 of LN2 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG1 of LN2 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG2 of LN2 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK MUXMUXLC/TRKPIM0 IMG3 of LN2 PIM1MUXMUXLC/TRK PIM2MUXMUXLC/TRK PIM3MUXMUXLC/TRK - Symbols - : Cable : Circuit card (ACT) : Circuit card (ST-BY) : Speech...
Page 429
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NDA-24307 CHAPTER 5
Page 401
Issue 1
FAULT REPAIR PROCEDURES
5.2 Speech Path System Fault - Fault Related to Speech
Faulty Situation:
Fault related to speech such as noise, one-way speech, no-speed, etc. occurs.
Even if dialing started, Dial Tone (DT) does not stop.
[1-C] Both TSW Write Failure
[1-D] TSW Write Failure
(1) For Dual Configuration
Check to see if fault occurs by replacing
TSW circuit cards one by one.Replace the TSW circuit card referring to
Section 2.3.2, TSW Card Replacement...](http://img.usermanuals.tech/thumb/54/84234/w300_nec-ipx-system-op-and-maint-ipx-u-type_d-428.png "Page 429
NDA-24307 CHAPTER 5
Page 401
Issue 1
FAULT REPAIR PROCEDURES
5.2 Speech Path System Fault - Fault Related to Speech
Faulty Situation:
Fault related to speech such as noise, one-way speech, no-speed, etc. occurs.
Even if dialing started, Dial Tone (DT) does not stop.
[1-C] Both TSW Write Failure
[1-D] TSW Write Failure
(1) For Dual Configuration
Check to see if fault occurs by replacing
TSW circuit cards one by one.Replace the TSW circuit card referring to
Section 2.3.2, TSW Card Replacement...")
NDA-24307 CHAPTER 5 Page 401 Issue 1 FAULT REPAIR PROCEDURES 5.2 Speech Path System Fault - Fault Related to Speech Faulty Situation: Fault related to speech such as noise, one-way speech, no-speed, etc. occurs. Even if dialing started, Dial Tone (DT) does not stop. [1-C] Both TSW Write Failure [1-D] TSW Write Failure (1) For Dual Configuration Check to see if fault occurs by replacing TSW circuit cards one by one.Replace the TSW circuit card referring to Section 2.3.2, TSW Card Replacement...
Page 430
CHAPTER 5 NDA-24307 Page 402 Issue 1 FAULT REPAIR PROCEDURES Check to see if a station-to-station connection can be set up and identify a circuit card responsible for the fault. Perform the above check by extracting the MUX circuit cards individually. When the PLO (PH-CK16-A/17-A)/CLK (PH-CLK18) circuit card is mounted for digital interface, replace PLO/CLK circuit card with a spare and check.Set MB switch of the PLO/CLK circuit card to UP side. Confirm OPE lamp on the PLO/CLK circuit card of the mate...