NEC NDA-24300 manual End

FAULT REPAIR PROCEDURES

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

ATTENTION

Contents Static Sensitive

Handling Precautions Required

A

Check to see if fault occurs by extracting TSW circuit cards one by one.

Check to see if the fault occurs by extracting MUX circuit cards one by one.

END

Replace the TSW circuit card referring to Sec- tion 2.3.2, TSW Card Replacement Procedure in Chapter 4.

Set the TSW circuit card into ACT mode by flipping the MBR key on the active GT (PH- GT09) card. Refer to Section 12.1.6, Manual System Changeover of Speech Path System, in Chapter 6.

Initialize the system by pressing the START button on the TOPU.

Check to see if a station-to-station connection can be set up to identify a TSW circuit card re- sponsible for the fault.

Perform the above check by extracting the TSW circuit cards individually.

Replace the MUX circuit card referring to Sec- tion 3.3.2, MUX Card Replacement Procedure, in Chapter 4.

Set the MUX circuit card into ACT mode by flipping the MBR key on the active GT (PH- GT09) card. Refer to Section 12.1.6, Manual System Changeover of Speech Path System, in Chapter 6.

Check to see if a station-to-station connection can be set up and identify a TSW circuit card re- sponsible for the fault.

Perform the above check by extracting the MUX circuit cards individually.

NDA-24300CHAPTER 5

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