FAULT REPAIR PROCEDURES

5.4Speech Path System Fault - STBY Side Has Become Faulty

Faulty Situation:

A fault occurred in the STBY side of the dual configuration system.

[1-B] TSW Failure (Permanent)

[1-D] TSW Write Failure

[1-F] TSW Clock Failure

[4-D] TSW Ready Failure

START

ATTENTION

Contents Static Sensitive

Handling Precautions Required

Check to see if the TSW circuit card is mak- ing poor contact.

Check PCM cables.

A

Set the TSW MBR switch of the TSW circuit card UP.

Set the MB switch of the TSW circuit card UP and extract the circuit card from its mounting slot.

Extract the TSW 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 TSW MBR and MB switches of the TSW circuit card UP and insert the circuit card into its mounting slot.

Set the MB switch of the TSW circuit card DOWN.

Set the TSW MBR switch DOWN.

Check if a station-to-station connection can be set up.

Check the PCM cables. See Figure 5-8.

Initialize the system by pressing the START button on the TOPU and see if a station-to-sta- tion connection can be set up.

CHAPTER 5

NDA-24300

Page 354

Issue 1

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NEC NDA-24300 manual Speech Path System Fault Stby Side Has Become Faulty