4.

DETAILED SYLLABUS

TOPIC

NOTES

1. Workshop Safety Rules and Regulations

1.1

Sources and Prevention of Hazards

Concept of safety

Sources of hazards

Treatments should include electric shock, damp or

wet floor, wrong handling of tools, improper

workshop dressing, horse play in the workshop

1.2

Safety Checks in Servicing Radio Receiver

Preparation of work areas

Capacitor discharges

Working on power lines and live circuits

Handling of tools

1.3

Safety Precautions in Television Workshop

Power supplies in T.V.

Picture tube

High voltage section

Component rating

Definition and structure of matter

2. Basic Electricity

Atomic structure

2.1

Structure of matter

Qualitative treatment only - definition and uses

2.2

Conductors, insulators and semiconductors

Definition, units and symbols of voltage, current

and resistance

2.3

Current, voltage and resistance

Laws of attraction and repulsion of charges

Identification of components by name, type,

graphical symbol, value and rating

Treatments should include resistors, capacitors,

2.4

Electronic components

inductors, diodes, transformers, transistors,

integrated circuit etc

Graphical symbols, types, values and ratings

Colour code of resistors and capacitors

Comparison between meter measured and colour

2.5

Resistors and Capacitors

code values

Testing of capacitors

Concepts, definitions and calculations

2.6

Kirchhoff’s Current and Voltage Laws

Types, graphical symbols and structure

Treatments should include testing for diodes and

transistor configuration (CC,CE and CB)

2.7

Diodes and Transistors

Graphical symbol of a battery( primary cell and

secondary cell) and types

Testing of battery

2.8

Battery

Treatments should include difference between wet

and dry cells

Definition

Symbols and relationship between voltage, current

and resistance.

2.9

Ohm’s law

Resistors in series and parallel

Definition, measurement and calculation

Definitions, difference, uses and measurement of

2.10 Electric power

d.c. and a.c.

2.11 Direct and Alternating Current

Definition and calculation

Treatments should include r.m.s., peak, and

average values, frequency and period in an a.c.

2.12 Alternating waveform

waveform

Types and uses

3. Electronic Tools and Instruments

Treatments should include screw drivers, diagonal

cutters, soldering gun, soldering iron, lead sucker

3.1

Electronic hand tools

or de- soldering tools, pocket knife, stripper and

soldering wick

Identification, uses and operation

Treatments should include voltmeter, ammeter,

ohmmeter, multi meter

3.2

Electronic measuring instruments

Basic a.c. and d.c. circuit, measurements of

voltage, current and resistance

Ohmmeter for testing semiconductor devices

Identification of faulty meter

Identification, uses and operation

Treatments should include oscilloscope, signal

tracer, digital frequency counter, logic probe, TV

3.3 Fault Finding Equipment

analyzer

Definition and application

4.1

Meaning of Electronics and Electronic circuit

Treatments should include types of emission e.g.

Thermionic, photoelectric, field and secondary

4.2

Concept of emission and photoelectric devices

Semiconductor theory and types

Semiconductor diodes

Treatment should include rectification, principles

4.3

Semiconductors devices

of operation, characteristics and application

Principle and operation, schematic diagram

Rectification and types

Filters

4.4

Power Supply Unit

Construction of stabilized low d.c. power supply

unit

Operation, construction and uses of Class A, B, C

and AB amplifiers

4.5

Amplifiers

Quantitative treatments only

Concept of feedback

4.6

Resistive, Inductive, Capacitive (RLC) circuits

Differences between types and their advantages

Effect of a positive feedback on amplifiers,

4.7

Feedback

bandwidth, noise, gain and distortion

Principle and types of oscillator

Construction of a typical oscillator circuit

Types of multivibrator

4.8

Oscillators and Multivibrators

Treatments to include astable, bistable and

monostable

Definition and types

5. Electronic Communication Systems

Block diagram, operation and function of each

stage

5.1 Electronic Communication Systems

Noise

Definition and classification

Propagation of radio waves

Radio frequency band- VLF, LF, MF, HF, VHF,

5.2 Electromagnetic spectrum

UHF,SHF and EHF

Application of frequency range in electronic

communication – frequency spectrum to be

intensified

Definition, types and functions

Treatments should include loudspeaker,

microphone, video camera, video display

5.3 Transducer

unit(cathode ray tube(CRT),Liquid Crystal

Display(LCD))

Definition, principle of operation and types of

modulation

AM and FM waveforms and envelopes

5.4 Modulation and demodulation

Percentage of modulation – modulation index and

modulation factor

Meaning and function of carrier wave in radio

communication.

Definition and types of demodulation

Function(s) and operation

Block diagram and function of each stage

Types of radio receivers – Tuned Radio

5.5 Radio transmitter and receiver

Receiver(TRF), super heterodyne receivers(FM and

AM)

Advantages and disadvantages of each

Definition

Concept and function of tuner in radio receiver

Identification of tuner stage in radio receiver

5.6 Selectivity and sensitivity

Definition, types of resonance ( series and parallel)

Concept of bandwidth and bandwidth ranges

Calculation involving frequency ranges to

5.7 Resonant circuit

determine bandwidth

Treatments should include derivation of the

formula for resonant frequency

Elements and types

Transmission and reception

Antenna

5.8 Satellite Communication Systems

Working principle

Block diagram

Stages

5.9 Television Transmitter

Principle of scanning

Video signals

Principle of FM detection

5.10 Image and Sound Reproduction in TV receiver

Concept of Television

Function and operation

Application of television system

5.11 Monochrome Television Receiver

Block diagram and function of each stage

Processing of picture and sound signal

5.12 Principles of operation of Colour Television

Primary colours in television

Receiver

Colour television systems and standards – PAL,

SECAM and NTSC

5.13 Principle of Colour Signal, Transmission and

Colour signal components

Reception

Techniques and precautions

6. Workshop Practice and Maintenance

Types of solder

Types of flux – amber resin and NaCl solutions

6.1 Soldering and Desoldering in Electronic

Circuits

Dismantling and reassembling of power supply unit

in a radio set

Dismantling and reassembling RF, IF detector

6.2 Electronic Repairs

Stages in a radio receiver set

AF amplifier circuit

Installation and maintenance of a car radio set

Diagnose fault by using fault finding pieces of

equipment and logical trouble shooting procedure

Components responsible for faults

6.3 Fault finding and repairs in radio receiver

Remedies for the faults

Alignment of RF and IF stages of a radio set using

the necessary equipment and tools

Use of multimeter

Treatments should include measurement of the

correct value of current, voltage and resistance

6.4 Electronic Measuring Instruments

in active and passive electronic components and

circuits

Procedure for TV repairs

Use of service information manual and circuit

diagram

6.5 Diagnosis and Repair of Black and White TV

Identification of symptoms and repair of faults

Receiver

Fault clearing instruments

Symptoms of faults

Fault clearing at each stage

Static and dynamic colour convergence comparison