MODULE-1 General information for DOMESTIC ELECTRONIC

MODULE-1 General information for DOMESTIC ELECTRONIC
MODULE-1
General
information
APPLIANCES
for
DOMESTIC
ELECTRONIC
Name of Sector
ELECTRONICS
Name of Module
Repair and maintenance
Electronic Appliances
MES Code
Duration of Course
ELC701
520 Hrs
of
Domestic
Entry Qualification of Trainee 8th Pass + 14 yrs of age
Unit size (No. Of trainees)
20
Power Norms
2.0 KW
Space Norms (Workshop and 60 Sq.mtr Minimum size of one side
Class Room)
to be 04m.
Instructors Qualification
B.E./ B.Tech. in
Electronics /
Electronics
&
Telecommunication/Electronics
&
Communication with one year
experience in the relevant field
OR
Diploma in Electronics/Electronics &
Telecommunication / Electronics &
Communication from recognized
board of technical education with two
years experience in the relevant field.
OR
NTC/NAC in the relevant trade with
three years’ experience respectively in
the relevant field
Desirable
Craft Instructor Certificate (CIC)
Objectives:
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Testing of electrical parameters, cables and measurements.
Select the proper instrument for suitable measurement.
Identify and test passive and active electronics components.
Practice soldering and de-soldering of various types of electrical
and electronics components.
Trouble shoot the faults in the given power supply circuits.
Identify various Input and output sockets/connectors of the
given UPS.
Identify various functional blocks/major components/ICs in the
given UPS.
Monitor, measure major test points and Test the capacity of the
given UPS and rectify the faults.
Identify and test various mechanical and electrical modules of
the given appliances.
Identify electronics parts/components/modules of the given
appliances.
Aware of models of different appliances and features.
Use reference manuals and identify the information required to
service the appliances.
Practice the standard troubleshooting procedures as suggested in
the product manuals.
Install the given appliance as recommended by manufacturer.
Terminal Competency: After completion of the module the
participant would be able to maintain and repair of Power supply,
inverter and UPS install and repair washing machine, repair
microwave oven, stream iron, electric rice cooker, electric kettle and
mixer grinder.
Course Contents for Module:- Repair and Maintenance of Domestic
Electronic Appliances
Practical Competencies
Basics of electricity and Electrical Cables
 Practice procedure for electrical and
personal safety measures
 Identify the Live, Neutral and Earth on
power Socket
 Construct a test lamp and use it to
mains healthiness
 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
Multi-meter
• Cleaning the switch contacts using
switch cleaning solution.
• Testing the fuse.
• Use the analog and digital Multi-meter
to measure the DC voltage by doing
measurement at the test points provided.
• Use the analog and digital Multi-meter
to measure AC voltage measurement by
Underpinning Knowledge
(Theory)
Basic terms electric charges,
Potential difference, Voltage,
Current, and Resistance.
Basics of AC & DC. Terms
such as positive cycle,
negative cycle, Frequency,
Time period, RMS, Peak
value , peak to peak,
instantaneous
values,
Insulators, conductors and
semiconductor. Different type
of electrical cables and their
specifications.
Precaution to be taken in
handling an analog Multimeter.
Study of different controls on
Multimeter
Principle of operation of
Analog
Multi-meter.
Precaution to be taken in
doing measurement at the test points
provided.
• Adjust the zero adjustment screw for
proper zero setting with the help of a
screw driver before using Multi-meter.
• Replace the battery in the Multi-meter.
• Replacing the open Fuse with correct
rating
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Basic Electronics Components
Identify the different types of resistors
Measure the resistor values using colour
code and verify the reading by
measuring in multi-meter
Identify the power rating using size
Identify different inductors and measure
the values using LCR meter
Identify the different capacitors and
measure
capacitance
of
various
capacitors using LCR meter
Dismantle and identify the different
parts of a relay
Identify different types of mains
transformers and test them
Identify the primary and secondary
transformer windings
Measure the primary and secondary
voltage of different transformers
handling digital Multi-meter
Frequently
occurring
problems
in
Analog
multimeters and the remedial
measures
.
Precaution to be taken in
handling digital Multi-meter,
Familiarization
with
operation controls of digital
Multi-meter
Principle of operation of
digital Multi-meter.
Frequently
occurring
problems
in
Digital
multimeters and the remedial
measures
Resistor-definition, types of
resistors, their construction &
specific use, color-coding,
power rating.
Types
of
inductors,
specifications
and
applications.
Types
of
capacitors,
specifications
and
applications
Working principle of a
Transformer,
Specifications
of
a
transformer, Step-up, Step
down
and
isolation
transformers
Fuse – types, use of fuses and
its rating.
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
 Construct a variable voltage regulator
using LM 723.
 Observe the output voltage of different
IC regulators by varying the input
voltage
UPS/Inverter
• Installation of UPS and Inverters
• Maintenance of batteries
• Dismantle the UPS and identify the
major parts
 Testing of major components
 Testing of power modules
 Charging, discharging and testing of
batteries.
Basic Electronics active
components,
testing
of
components,
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.
SMPS
 Dismantle the given SMPS and find Block Diagram of Switch
mode power supplies and
major sections/ ICs components.
their working principles
• 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.
Washing machine
• Installation of front load washing
machine
• Installation of top load washing machine
• Identify the internal and external parts of
semi-auto washing machine
• Identify the internal and external parts of
fully automatic washing machine
• Operate
semi–automatic
washing
machine
• Operate
fully–automatic
washing
machine
• Rectify the fault leading to not working
of control panel switches.
• Rectify the fault leading to not working
of pulsator / agitator.
• Rectify the fault leading to spin drier not
working.
• Rectify the fault leading to one side
rotation of motor.
• Rectify the fault leading to water inlet
and outlet valves.
Microwave oven
• Identify the internal and external parts of
micro wave oven.
• Identify the different touch pad controls
their functions
• Testing of high voltage diode.
• Identify the HV capacitor and discharge
it.
• Rectify the fault leading to fuse blows
off when cooking is initiated.
• Rectify the fault leading to not
responding of touch switches.
( front panel )
• Rectify the fault leading to dead set.
• Rectify the fault leading to long cooking
Washing M/c: different types
of
machines,
washing
techniques, parts of manual,
semi automatic and fully
automatic machines, basic
working principle of manual,
semi automatic and fully
automatic machines, study
the working of motors,
different types of timers,
power supply circuits.
Microwave oven: Different
types of oven, study the
various functions of Oven,
Electrical wiring diagram of
microwave oven, working of
Power supply.
time.
• Precautions
–
importance
of
interlocking switch in performing
maintenance
Steam Iron
 Dismantle and identification of various
parts, wiring, tracing of various controls,
Electronic circuits in steam Iron
 Identify the faults in steam iron & rectify
Electric Rice cooker
 Identify various components of Electric
rice cooker, controls and trace the circuit
and rectify the simulated faults.
Principle of electric iron,
parts
of
steam
iron,
thermostat heat controls.
Principle of working of rice
cooker.
Various parts & functions of
rice cooker, temperature
control and timer unit.
Electric kettle
Identify various components of Electric kettle Principle of working of
, controls and trace the circuit and rectify the electric kettle.
simulated faults.
Various parts & functions of
electric
kettle
and
temperature control unit.
Mixer & Grinder
 Dismantle and identification of various Various parts & functions of
parts, wiring, tracing of various controls, Mixer/Grinder, speed control
Electronic circuits in various types of circuit & automatic over load
protector.
Mixers/grinders
 Identify the faults in various types of
Mixers/grinders & rectify
List of Tools & Equipment for module:-
Repair and maintenance of
Domestic Electronic Appliances
Sl no
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Name of Tool/ Equipment
Quantity
Inverter / UPS trainer
Battery charger
Technicians tool kit
Digital Multi-meter
Analog Multi-meter
Clip on ammeter
Soldering iron
De-soldering pump
Soldering / de-soldering temp controlled station
Washing machine Semi automatic/Fully
automatic
Micro wave oven grill, convention type
Spares for micro wave oven
Hand glove
Radiation leakage tester
Steam iron
Electric rice cooker
Electric kettle
Mixer-grinder
1 No
4 Nos.
20 Nos
10 Nos.
4 Nos
As Required
4 Nos.
4 Nos.
1 No.
1 No. each
1 No. each
As required
4 pairs
1 Nos
2 nos
2 nos
2 nos
2 nos
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