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NDA-24300 CHAPTER 1
Page 1
Issue 1
CHAPTER 1 INTRODUCTION
1. GENERAL
This manual describes routine system maintenance procedures and fault repair procedures. This chapter explains
how to follow the manual and provides precautions pertaining to maintenance jobs as a whole. Be sure to read
this chapter thoroughly before starting the required maintenance project.
2. HOW TO FOLLOW THIS MANUAL
If technicians engage in a fault repair with a sufficient amount of knowledge of the system (system
configurations, controlling systems, functions, etc.), the time spent repairing the system is minimized. This
manual provides explanations about the system, while placing emphasis on system configurations, controlling
systems, and functions. If faults of all conceivable cases are to be assumed for the explanations, the explanations
may lack reality and be more difficult to understand. Therefore, this manual provides the explanations on the
basis of the following points:
(1) It is very important to determine whether the fault occurred in the PBX or at any of the peripheral equip-
ment.
(2) In case the PBX is faulty, explanations are provided about the actions to take until the faulty circuit card/
cards are identified.
(3) Explanations will be omitted pertaining to the following faults:
• Fault of peripheral equipment (MAT, telephone sets, etc.)
• Fault due to an error in office data assignment
• Fault due to an error in installation procedure (an error in circuit card switch setting, cross-connection,
etc.)
(4) How to Read This Manual
• When a fault is to be repaired for the first time
See Section 3, How to Read Precautions, Diagnostic,
and Fault Repair Information, Chapter 2.
See Section 4, Reporting Fault to NEC, in Chapter 2.
Go to Chapter 5.