NEC nd-20292 manual Chapter Maintenance

ND-20292

APRIL, 1990

CHAPTER 5

MAINTENANCE

		TABLE	OF	CONTENTS
SECTION		DESCRIPTION				PAGE
510	GENERAL					500-l
520	OPERATIONAL			CURRENT
	AND	VOLTAGE		CHECKS		500-l
530	OPERATIONAL			TEST
	PROCEDURES
530.1		General				500-l
530.2		Before	Initialization			500-2
530.3		System	Initialization			500-2
530.4		After Initialization				500-2
540	TROUBLESHOOTING				FLOW
	CHARTS
540.1		Problem	Solving			500-3
550	SELF DIAGNOSTICS				AND
	MAINTENANCE
550.1		Self Diagnostics				500-3
550.2		Maintenance				500-4

SECTION 510

GENERAL

This Chapter is to be used as a guide for diagnoses and

troubleshooting problems during and after system

installation. The troubleshooting flow charts, general

test procedures and Maintenance Memory Blocks (See Chapter 3 of this manual) lE5, 3B4, 3D3, 3D4, 5Bl to 5B6, 5Cl and 5C2 will help the technician to identify the cause of a problem by defining the problem area and isolating the valid symptoms.

In addition, with the System Data Up/Down Load

feature, all system programming, speed dial data, and

Forced Account Code information can be stored on diskette. (Refer to Chapter 9 of this Manual.) After all

system programming has been completed, it should be down loaded onto diskettes for a backup copy of the

system programming. In case of system memory failure, the system could be up loaded with the backup diskettes.

SECTION 520

OPERATIONAL CURRENT AND

VOLTAGE CHECKS

The effectiveness of this portion of the maintenance section depends upon the technician’s ability to answer correctly all questions posed as accurately as possible. Due to external factors, it is important that no answer be assumed. For example, it cannot be assumed that a power supply is working properly because it has been replaced with another power supply. It is necessary to test the output of the power supply with a volt meter

(See Table 520-l for specifications). Before a

technician can attempt any troubleshooting, the correct tools should be available.

1.Digital or Analog Multimeter, capable of reading:

A.DC current and voltage

B.AC current and voltage

C.DC Resistance

2.Test Set, linemen, being capable of:

A.Termination and Monitor Modes

B.DTMF and Dial Pulse dialing

3.Hand tools:

A.Set of screwdrivers (common and Phillips head blades)

B.Set of pliers, long nose and diagonals

C.Punch down tool

4.The complete Electra Mark11 Installation Service Manual with all the latest up to date information, as well as the completed job specifications.

SECTION 530

OPERATIONAL TEST PROCEDURES

530.1When the Electra Mark11 System is first

powered up it runs through an initialization process. During this process the CPU-E ( ) ETU, in module 1, scans each of the thirty two interface slots to determine

the hardware configuration used. This information is stored in the Resident System Program memory with the system default values. Section 530 provides test procedures to be used before, during, and after this

initialization process.

500-l