NEC NDA-24300 manual Speech Path System Fault When Dial Tone DT Cannot Be Heard

FAULT REPAIR PROCEDURES

5.3 Speech Path System Fault - When Dial Tone (DT) Cannot Be Heard

Faulty Situation:

•Dial Tone (DT) cannot be heard.

•[1-A] Both TSW Failure (Permanent)

•[1-E] Both TSW Clock Failure

•[4-C] Both TSW Ready Failure

•[23-Y] MUX Clock Failure

ATTENTION

Contents Static Sensitive

Handling Precautions Required

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.

START
	Check to see if the TSW circuit card is		Set TSW circuit card into STBY mode by flip-
	making poor contact.		ping 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.
			Set TSW MBR switch on the TSW card UP.
			Set MB switch of the TSW circuit card UP.
			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 TSW MBR and MB switches on the TSW
			circuit card UP and insert the circuit card into
			its mounting slot.
			Set MB switch of the TSW circuit card DOWN.
			Set TSW MBR switch DOWN.
			Check if a station-to-station connection can be
			set up.
	Check front cables.		Check the front cables. (See Figure 5-8).
END
			Initialize the system by pressing the START
			button on the TOPU and see if a station-to-sta-
			tion connection can be set up.

NDA-24300CHAPTER 5

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