CHAPTER 7 ROUTINE MAINTENANCE PROCEDURE

1.GENERAL

When a fault has occurred in the system, (for example when a fault has occurred to No. 1 circuit on the 16LC card), the stations connected to No. 1 circuit become unserviceable. When the 16LC card has been replaced with a spare to analyze the cause of the fault or to repair the fault, other normal lines also become unserviceable. As in this example, even when the fault is restricted to a single component, it very often harms the system operations as a whole.

Even if the system is operating normally, it is necessary to perform a routine check to prevent a fault occurrence before it is too late to discover any latent cause of a fault.

This chapter categorizes the routine maintenance procedures of the PBX into the following three types, and ex- plains the minimum required work steps and precautions pertaining to each of the three procedures.

Daily Maintenance Procedure

Monthly Maintenance Procedure

Quarterly Maintenance Procedure

1.1Flow of Procedures

The scheduling of routine maintenance (daily, monthly, quarterly) will vary with each installation and or- ganization. Figure 7-1shows the flow of the routine maintenance procedures.

Section 2.7, Explanation of Terms in Chapter 2

 

Section 2, Routine Maintenance Procedures

 

Daily Maintenance Procedures

 

 

Monthly Maintenance Procedures

 

 

Quarterly Maintenance Procedures

Chapter 5, Fault Repair Procedures

Note: Perform procedure performance per

Chapter 6, System Operations

 

each divided section

 

 

 

Chapter 4, Unit/Circuit Card

 

 

Replacement Procedure

Section 3, Routine Maintenance Check Lists

 

Recording of checked items

 

 

 

Figure 7-1 Flow of Procedures

NDA-24300CHAPTER 7

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NEC NDA-24300 manual Routine Maintenance Procedure, Flow of Procedures