NEC NDA-24300 manual Fault Repair Procedures, Fan Unit Fault

FAULT REPAIR PROCEDURES

Table 5-1 Fault Repair Procedure Quick Reference (Continued)

FAULTY ITEM	FAULTY SITUATION	REFERENCE SECTION
Speech System Fault	Faults related to speech.	Section 5.2, Speech Path System
		Fault - Fault Related to Speech
	Dial tone is not heard.	Section 5.3, Speech Path System
		Fault - When Dial Tone (DT)
		Cannot Be Heard
	STBY side is faulty.	Section 5.4, Speech Path System
		Fault - STBY Side Has Become
		Faulty
Control System Fault	Fault occurs occasionally at the ACT side.	Section 6.2, Control System Fault -
		Fault Occurs Intermittently
	STBY side is faulty.	Section 6.3, Control System Fault -
		STBY Side Is Faulty
Alarm Indication Fault	No fault indication is made on the Alarm Indicator	Section 7.2, Fault of Alarm
	Panel.	Indicating Panel
	Fault is not detected.	Section 7.3, Fault That Cannot Be
		Detected
Power Supply Fault	Fuse for RGU/-48V has blown.	Section 8.2, Fuse Blown Fault
	The circuit breaker of PWR supply is off.	Section 8.3, Circuit Breaker OFF
		Fault in PWR Supply
	Alarm lamp on the PWR supply is lit.	Section 8.4, Fault of Alarm Lamps
		on PWR Supply
Fan Unit Fault	• Fan are not activated even if the temperature has risen	Section 9.2, Fan Unit Fault
	higher than a predetermined degree.
	• Fans are not activated even if the FAN START switch
	is set to AUTO position.
Tone Fault	Tone is distorted.	Section 10.2, Tone Fault
System Down Fault	Cause for the fault cannot be identified.	Section 11.1, When Cause for Fault
		Cannot Be Identified
	The faulty circuit card can be detected.	Section 11.2, When Faulty Circuit
		Cards Can Be Assumed From
		System Message
CCIS Line Fault	• A Specific CCH/CCT card is faulty. When the signal	Section 12.3, Specific CCH/CCT
	transmission line is a digital line, transmission/re-	Card Is Faulty and
	ceiving of control signals cannot be performed.	Section 12.4, Fault of CCH, DTI
	• When the signal transmission line is an analog line,	and Related Flat Cable
	transmission/receiving of control signals cannot be
	performed.

CHAPTER 5 NDA-24300

Page 310

Issue 1