Repair and maintenanc Practical Competencies Basics of electricity

Repair and maintenanc Practical Competencies Basics of electricity
Repair and maintenance of Personal Electronic Devices
Practical Competencies
Underpinning Knowledge (Theory)
Basic terms electric charges, Potential difference,
Basics of electricity and Electrical Cables
 Practice procedure for electrical and personal Voltage, Current, and Resistance. Basics of AC &
safety measures
DC. Terms such as positive cycle, negative cycle,
 Identify the Live, Neutral and Earth on power Frequency, Time period, RMS, Peak, P-P,
instantaneous values, Insulators, conductors and
 Construct a test lamp and use it to mains semiconductor. Different type of electrical cables
and their specifications.
 Use a Tester to monitor AC power.
 Measure the voltage between the neutral and
ground and rectify earthing
 Identify and test different ac mains cables
 Skin the electrical wires /cables
 Measure the gauge of the wire using SWG
 Make the mains cable for termination
 Identify the primary and secondary cells
 Measure and test the voltages of the given
cells/battery using analog and digital Multi-meter
 Charge and discharge the battery
 Use a hydro meter to measure the specific
gravity of the secondary battery
Precaution to be taken in handling an analog MultiMulti-meter
 Cleaning the switch contacts using switch meter.
cleaning solution.
Study of different controls on Analog Multi-meter
 Testing the fuse.
Principle of operation of Analog Multi-meter.
 Use the analog and digital Multi-meter to measure Precaution to be taken in handling digital Multithe DC voltage by doing measurement at the test meter
points provided.
Frequently occurring problems in Analog Multi Use the analog and digital Multi-meter to measure meters and the remedial measures.
AC voltage measurement by doing measurement at Precaution to be taken in handling digital Multithe test points provided.
 Adjust the zero adjustment screw for proper zero Familiarization with operation controls of digital
setting with the help of a screw driver before using Multi-meter
Principle of operation of digital Multi meter.
 Replace the battery in the Multi-meter.
Frequently occurring problems in digital of Multi Replacing the open Fuse with correct rating
meters and the remedial measures
Resistor-definition, types of resistors, their
Basic Electronic Components
 Identify the different types of resistors.
construction & specific use, color-coding, power
 Measure the resistor values using colour code rating.
and verify the reading by measuring in multi meter. Types of inductors, specifications and applications.
 Identify the power rating using size
Types of capacitors, specifications and applications
 Identify different inductors and measure the Working principle of a Transformer,
values using LCR meter.
Specifications of a transformer, Step-up, Step down
 Identify the different capacitors and measure and isolation transformers.
capacitance of various capacitors using LCR meter. Fuse – types, use of fuses and its rating.
 Dismantle and identify the different parts of a
 Identify different types of mains transformers
and test them.
 Identify the primary and secondary transformer
 Measure the primary and secondary voltage of
different transformers.
Power supply
 Testing of active components
 Practice soldering and de-soldering techniques
 Assemble and test– half wave, full wave & bridge
rectifier circuits with and without filter.
 Identify the different types of fixed positive and
negative regulator ICs (78/79 series)
 Identify the pins
 Construct a fixed voltage regulator using
78xx/79xx series ICs
 Observe the output voltage of different IC
regulators by varying the input voltage
 Installation of UPS and Inverters
 Maintenance of battery.
 Dismantle the UPS and identify the major parts.
 Testing of major components.
 Testing of power modules.
 Charging, discharging and testing of batteries.
 Dismantle the given SMPS and find major
sections/ ICs components.
 Measure voltages at vital points
 Identify various input and output sockets /
connectors of the given SMPS.
 Repairing of SMPS, simulating various faults
diagnosing and rectifying it.
 Installation of a TV receiver.
 Indentify the different controls of LCD/LED TV
 Indentify the various connector provided on
LCD/LED TV and test the healthiness
 Dismantle the panel of LCD/LED TV
 Dismantle, identify the parts of remote control
 Trace and rectify the faults of remote control
 Check power supply and front panel control
Basic Electronics active components, testing of
Working of half wave, full wave and bridge
rectifier circuits.
Voltage Regulator circuit.
Applications of transistor – its uses
MOSFET – precautions when handling.
DIAC, SCR, TRIAC - application
Identify the pin diagram of Voltage regulator ICs
Various types of batteries used in
UPS and Inverters and their maintenance.
Different types of inverter, UPS, Working
principle, specifications, explanation with the help
of block diagram.
Block Diagram of Switch mode power supplies and
their working principles.
Explain the working principle of color TV using
block diagram.
Explain the need and working principle of each
Detailed explanation of power supply and high
voltage generation section. Explanation of PTC,
various voltages required for PTC.
Difference between a conventional CTV with LCD
& LED TVs.
Principle of LCD and LED TV and function of its
different section. TV Remote Control –Types, parts
and functions, Working principle, operation of
remote control. Different adjustments, general
faults in Remote Control.
Electrical and personal safety, dangers and
DTH System
 Practice procedures for safety and health hazards preventions
Basic satellite communication, Merits & Demerits
 Identify the various mini-dish components and of satellite communication, applications, types of
their functions
 Identify & use of different tools and equipments
used in DTH installation procedure & cabling
 Identification of Various types of connectors,
cables and wiring procedure.
 Follow the chronological order to assemble the
 Install a DTH system & track a TV channel
 Site selection, installation mounting tracking for
azimuth and elevation angles using SAT meter.
 Identify the faults in DTH system & rectify.
 Identification & use of various I/O ports of STB.
 STB connection and first installation.
 Identify the faults in STB & rectify.
Cell phones
 Dismantle, identify the parts and assemble
different types of cell phone/smart phones.
 Dismantle the cell phone/smart phone replace
the display
 Dismantle the cell phone/smart phone remove
the key pad and clean it, test for the continuity of
the matrix/tracks
 Test the battery and battery charger with Multimeter.
 Check track continuity and use jumpers for track
 Test and rectify the problems in antenna and
antenna switch
 Interface the cell phone/smart phone to the PC
and transfer the data
 Connect internet on cell phone and browse
popular web sites
 Flash the various brands of cell phone/smart
phone ( at least 3)
 Upgrade the OS
 Format the cell phone/smart phone for virus(
approach the mobile repair chop)
 Identify the defective parts and rectify
Home theatre
 Identification of different parts of home theatre
 Testing of speakers, woofers& tweeters
 Set up of home theatre using specific devices
 Identification of different parts of AV receiver
 Identify the faults in AV receiver & rectify
 Testing of speakers
 Identify the faults in CAR STEREO receiver &
Computer Hardware,
satellite & its orbits, Satellite Frequency Bands.
Basic components of DTH system: PDA, LNBC,
Satellite receiver terminal, dish installation aspects,
Azimuth & elevation settings of dish/ DTH
Types of cables used in DZTH system, impedance
and specification
Multi-dwelling unit design, headed amplifier, line
amplifier, cascaded in/out multi-switch, tap, and
Set top box features, block diagram of set top box,
I/O ports, Cable modem termination system,
software & customer premises equipments.
Introduction to various types of mobile handsets,
their description, features & uses of these features.
Identify the keys and their uses.
Identify the components used in a cell phone.
Use of various solders , flux and cleaning Agents
Use of antenna and antenna switch.
SIM and SIM related problems of GSM & CDMA
Use of computer for cell phone servicing – cell
phone software
Flashing and its need- precautions to be taken while
Knowledge of downloading of
add-on software, ring tones, wall papers, themes,
etc. on non multimedia and multimedia handsets,
window based handsets
Introduction to Home theatre, surround sound
system, basic components, block diagram of home
theatre & working
Block diagram of car stereo. Components of car
Basic blocks of a computer, Hardware and
 Identification of various indicators, Connectors, software, I/O devices, keyboard, types of mouse,
ports on the computer cabinet
Different types of printers, HDD, DVD. Various
 Identify drives and their capacity.
ports in the computer.
 Identify various connectors and cables inside the
cabinet & Identify connections to rear side and
front panel of the cabinet
 Identify various parts of the system unit and
 Replace the CMOS battery
 Replace/Extend a memory module
 Test and Replace the SMPS
 Replace the given HDD on the system
 Replace the given DVD on the system
 Configuring and troubleshooting display
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