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CHAPTER 4
MAINTENANCE
LEARNING OBJECTIVES
Upon completion of this chapter, you should be able to do the following:
4. Identify the characteristics of amplifiers used in
1. Describe the different uses of schematics and
drawings by IC Electricians when performing
announcing systems, and discuss the principles of
maintenance.
2. Describe the principles of testing, repairing, and
5. Identify some of the fundamentals of modular
replacing chassis wiring.
assemblies and parts substitution in maintenance
work.
3. Recognize some of the fundamentals of preventive
and corrective maintenance.
6. Recognize some of the practices used to maintain
and repair IC switchboards.
INTRODUCTION
paragraphs will discuss the use of these drawings when
you perform maintenance on IC equipment and systems.
Since IC Electricians are responsible for preventive
and corrective maintenance of interior communications
SCHEMATICS
systems, the y must be able to perform tasks such as
repairing chassis wiring, matching speaker impedance,
The diagrams IC Electricians use most often are the
and servicing IC switchboards and associated
equipment. This chapter describes general procedures
electrical and electronic schematics. From past
for these tasks and for troubleshooting equipment in IC
experience, they should be familiar with the basic
systems.
symbols, the building blocks of the schematics. There
are new symbols for semiconductors, and future
developments will undoubtedly bring more. Graphic
DRAWINGS AND SCHEMATICS
Symbols for Electrical and Electronic Diagrams, USA
As a senior IC Electrician, you will use your ability
Standard 432.16, has been adopted for mandatory use
to interpret schematics and drawings proper] y when
by the Department of Defense.
accomplishing your maintenance tasks and when
Wiring diagrams and equipment for integrated
helping the less experienced personnel do the same.
electronic systems are complex and require a knowledge
When working with these people, you will often need
of wire and cable identification markings and symbols
simplified versions of certain schematics and drawings.
that show the interconnection of units. Because of the
Instruction books used by IC Electricians may
increased use of computers and electronically controlled
contain diagrams of various types of schematic
and mechanically operated automatic devices, the IC
d i a g r a m s , block diagrams, wiring diagrams,
Electrician must recognize symbols and basic principles
interconnecting cable diagrams, mechanical drawings,
to interpret correctly mechanical drawings and
and combinations of these. Diagrams are normally used
electronic diagrams that show mechanical functions.
for presenting information in a small space or for
clarifying complex and detailed written explanations.
A complete schematic drawing of complex
equipment may be too large for practical use. For this
In chapter 3, we discussed various types of ship's
reason, most technical manuals present partial or
drawings and diagrams and the procedures for verifying
the accuracy of these drawings. The following
simplified schematics for individual circuits or units.
4-1

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