NEC NDA-24300 manual Fault Repair Procedures, Faulty Item Faulty Situation Reference Section

CHAPTER 5 FAULT REPAIR PROCEDURES

This chapter provides information on how to repair the fault(s) within the system. If any of the components or equipment listed in Table 5-1has a failure, move on to the repair procedure explained for each faulty condition.

Table 5-1 Fault Repair Procedure Quick Reference

FAULTY ITEM	FAULTY SITUATION		REFERENCE SECTION
Line Fault	DP/PB Telephone	Dial tone is not heard.	Section 1.3, Line Fault - When Dial
			Tone (DT) Cannot Be Heard
		Dialing results in a wrong	Section 1.4, Line Fault - When
		connection.	Dialing Results in Wrong
			Connection
		Bell does not ring.	Section 1.5, Line Fault - When Bell
			Does Not Ring
		Answer/speech cannot be	Section 1.6, When Call Cannot Be
		made.	Answered and Speech Cannot Be
			Made
	Dterm	• Dterm cannot be operated.	Section 1.7, Dterm Fault
		• Operations are abnormal.
Trunk Fault	• No connections can be set up.		Section 2.3, Trunk (ORT, SND,
	• PB/DP signals are erroneously received or set out		CFT) Fault and Section 2.4, Trunk
			(COT, TLT, DTI) Fault
	from ORT/SND.
	• No three-way calling can be made on CFT, or noise
	gets in a established connection.
	• A connection results in no speech.
	• Noise gets in a established connection.
ATTCON/DESKCON	• No speech can be made.		Section 3.3, ATTCON/DESKCON
	• No control operations can be made.		Fault
Unit Fault	Faults related to speech.		Section 4.2, Unit Fault - Fault
			Related to Speech
	Dial tone is not heard.		Section 4.3, Unit Fault - When Dial
			Tone (DT) Cannot Be Heard
	The ACT MUX card side has become faulty and system		Section 4.4, Unit Fault - ACT-Side
	changeover has been executed.		MUX Card Is Faulty and System
			Has Changed Over

NDA-24300CHAPTER 5

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