Electronic Products Assembly and Servicing 7/8

FIRST QUARTER

Quarter: 1 Week: 1 Day: 1 Activity No. 1

Competency: Plan task to be undertaken
Objective: Identify basic hand tools
Topic: Basic Hand Tools
Materials:
Reference: K-12 Basic Education Curriculum Technology and Livelihood Education
Learning Module-Exploratory Course Grade 7 and Grade 8
Competency Based Learning Materials (CBLM) TESDA Approved
Copyright: For classroom use only
DepEd owned

Concept Notes:
BASIC HAND TOOLS

a. b. c. d.

e. f. g. h.

i. j. k. l. m.

n. o. p.

q. r. s. t.

u. v.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:

Directions: Match the different hand tools with the actual pictures. Write only the letter of your
answer on a separate sheet of paper.
____1. Desoldering Tool _____6. Paint Brush
____2. Soldering Iron _____7. Hack Saw
____3. Soldering Stand _____8. Side-Cutter
____4.Long Nose Pliers _____9. Wire Stripper
____5. Portable Electric Drill _____10. Magnifying Glass
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 1 Day: 2 Activity No. 2

Competency: Select the Appropriate Hand Tools for the job/task
Objective: Classify basic hand tools
Topic: Classification of Basic Hand Tools and Test Equipment
Materials:
Reference: K-12 Basic Education Curriculum Technology and Livelihood Education
Learning Module-Exploratory Course Grade 7 and Grade 8
Competency Based Learning Materials (CBLM) TESDA Approved
Copyright: For classroom use only
DepEd owned

Concept Notes:
BASIC HAND TOOLS

Driving Tools

Flat Screwdriver Philip Screwdriver Precision Screwdrivers

Soldering Tools

Desoldering Tool Soldering Iron Soldering Tool Stand

Splicing Tools

Long Nose Wire Stripper Side Cutter

Boring Tools

12 Volt Mini-Drill Portable Electric Drill Flat File Half Round File

Round File
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Cutting Tools

Hacksaw Utility Knife Side Cutter

Auxiliary Tools

Magnifying Glass Paint Brush

Electronic Equipment

Oscilloscope Signal Generator

Analog Volt-Ohm-Milliammeter Digital Volt-Ohm-Milliammeter

ACTIVITY:

Directions: Classify the following basic tools to where it belongs, driving tools, soldering tools,
boring tools, cutting tools, auxiliary tools or electronic equipment. Write your answer on a
separate sheet of paper.
1. 2. 3. 4.

5. 6. 7. 8.

9. 10.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 1 Day: 3 Activity No. 3

Competency: Check hand tools for proper operation and safety
Objective: Describe the functions of basic hand tools and test equipment
Topic: Basic Hand Tools and its Functions
Materials:
Reference: K-12 Basic Education Curriculum Technology and Livelihood Education
Learning Module-Exploratory Course Grade 7 and Grade 8
Competency Based Learning Materials (CBLM) TESDA Approved
Copyright: For classroom use only
DepEd owned

Concept Notes:

BASIC HAND TOOLS

Driving Tools
Screwdrivers – are hand tools specifically designed to insert and tighten, or to loosen and
remove screws.

a. Slotted Screwdriver –used to fasten negative

slotted screws

b. Philip Screwdriver –used to drive or fasten positive

slotted screws.

c. Precision Screwdriver Set –a set of small

screwdriver composed of slotted and Philip
screwdrivers

Soldering Tools
a. Soldering Iron – a device for applying heat to melt
solder in attaching two metal parts.

b. Soldering Iron Stand –a place where the soldering

iron is placed during usage.

c. Desoldering Tool –used in removing soldered

wires and components on printed circuit boards for
troubleshooting and repair purposes.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Splicing Tools
a. Long Nose –used for holding, bending and
stretching the lead of electronic component or
connecting wires.

b. Wire Stripper –is a pair of opposing blades

much like scissors or wire cutters.

c. Side Cutter –is a wire cutting pliers, they are not

used to grab or turn anything, but are used to cut
wires

Boring Tools
a. 12 volt Mini-Drill –used to bore or drill holes in the printed circuit
board (PCB) with size from 1/32”-1/16”.

b. Portable Electric Drill –used for boring holes in

plastic or metal chassis with the use of drill bits having
sizes from 1/16” to approximately ¼”

Metal Files
 These are hand tools having a series of sharp, parallel ridges or teeth. Most files have a
narrow, pointed tang at one end to which handle can be fitted.

c. Flat File –is parallel in width and tapered in thickness; they

are used for flat surfaces and edges.

d. Half Round File –tapered in width and thickness; coming

to a point and is narrower than a standard half round and used
for filling inside of rings.

e. Round File –also called rat tail file which is gradually

tapered and used for many task that require a round tool,
such as enlarging round holes or cutting a scalloped edge.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Cutting Tools
a. Utility Knife –used in cutting various trades and crafts
for a variety of purposes.

b. Hacksaw – is used for cutting metals.

c. Side Cutter –is a wire cutting pliers, they are not used
to grab or turn anything, but are used to cut wires

Auxiliary Tools
a. Magnifying Glass -is a convex lens which is used to
produce a magnified image of an object

b. Paint Brush – made of bristles set in handle, use for

cleaning dirty parts of a circuit or an object.

Electronic Equipment
a. Volt-Ohm-Milliammeter -an equipment that combines
three functions: as a voltmeter that measures both ac and dc
voltages; an ohmmeter that measures resistance; and
milliammeter that measures small amount of dc current.

b. Oscilloscope - electronic test equipment that allows

signal voltages to be viewed, usually as a two-dimensional
graph of one or more electrical potential differences
(vertical axis) plotted as a function of time or of some
other voltage (horizontal axis).

c. Signal Generator -a device which produces simple wave

forms. It contain an electronic oscillator, a circuit that is
capable of creating a repetitive wavefor

ACTIVITY:
Directions: Describe the functions of the following tools. Write your answer on ½ crosswise of
paper. Do not write anything on the activity sheets.
1. Hacksaw 6. V-O-M
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

2. Philip Screwdriver 7. Utility Knife

3. Round File 8. Long Nose
4. Paint brush 9. 12 volt Mini-Drill
5. Portable Electric Drill 10. Oscilloscope
Quarter: 1 Week: 1 Day: 4 Activity No. 4
Competency: Check hand tools for proper operation and safety
Objective: Draw basic hand tools
Topic: Performance Task no. 1 Basic Hand Tools and Electronic Equipments
Materials: Triangle ruler 30x60, 45x45, ruler, pencil, bondpaper size 8.5”x 13”
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:

Job Plate No. 1

Title: Basic Hand Tools and Electronic Test Equipment
Direction: Draw in a one whole sheet of bond paper draw the Basic Hand Tools and
Electronic Equipment and label each tools. Borderlines must be drawn on heavy lines and
must maintain 1 inch margin on each side.
Materials Needed:
Pencil
Eraser Bond paper
30 x 60 triangle ruler (optional) 45 x 45 triangle ruler (optional)
Ruler T-square (optional)

Sample Activity:

Long Nose Signal Generator volt-ohm-milliammeter

Philip Screwdriver Soldering Iron Side Cutter

SAN ROQUE NATIONAL HS JOB GREGORIO Z. APALE

ALBURQUERQUE, BOHOL PLATE BASIC HAND TOOLS AND EPAS-TEACHER

JOHN MICHAEL EYO NO. 1 ELECTRONIC EQUIPMENT DB: DF:

EPAS - STUDENT
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 2 Day: 1 Activity No. 1

Competency: Check hand tools for proper operation and safety
Objective: Recognized the common faults in using hand tools
Topic: Common Faults in Using Hand Tools
Materials: Triangle ruler 30x60, 45x45, ruler, pencil, bondpaper size 8.5”x 13”
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Concept Notes:

COMMON FAULTS IN USING HAND TOOLS

Pliers:
 Do not increase the handle length of pliers to gain more leverage. Use a larger pair of
pliers or bolt cutters if necessary.
 Do not substitute pliers for a wrench when tuning bolts and nuts. Pliers cannot grip these
items properly and might cause slip and create accident.
 Never use pliers as hammers on the handle. Such abuse is likely result in cracks or
breaks.
 Cut hardened wires only with pliers designed for that purpose.
 Always cut wires in right angle. Never rock from side to side or bend wire back and
forth against the cutting edges.

Screwdrivers:
 Never use screwdriver as pry bar, chisel and punch stirrer or scrapper.
 Never use screwdrivers with broken or worn-out handles. Screwdrivers of these kind
should have tags to indicate that they are defective.
 Never use pliers on screwdriver for extra leverage. Only use wrench or screwdrivers
specifically designed for purpose.

Utility Knives:
 Do not use dull blades they require more force, thus are more likely to slip. Replace the
blade when it starts to “tear” instead of cut.
 Never leave a knife unattended with blade exposed
 Don’t bend or apply side loads to blades by using them to open cans or loosen tight
cover of containers. Blades are brittle and can snap easily.

ACTIVITY:

Directions: Supply the missing word that corresponds the correct answer. Write your answer on
a ¼ sheet of paper.
1. Never use ___________ as pry bar, chisel and punch stirrer or scrapper.
2. Cut hardened wires only with pliers_____________ for that purpose.
3. Don’t ________ or apply side loads to blades by using them to open cans or loosen tight cover
of container
4. Never ________ a knife unattended with blade exposed
5. Do not use _________blades they require more force, thus are more likely to slip
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

6. Do not increase the ________ length of pliers to gain more leverage. Use a larger pair of pliers
or bolt cutters if necessary.
7. Always cut wires in _________ angle
8. Do not ___________ pliers for a wrench when tuning bolts and nuts
9. ________ hardened wires only with pliers designed for that purpose.
10. Use a _________ pair of pliers or bolt cutters if necessary.
Quarter: 1 Week: 2 Day: 2 Activity No. 2
Competency: Apply the appropriate hand tools for the given task
Objective: Identify tools used according to tasks undertaken.
Topic: Use of Tools Based on their functions and operations
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

USING TOOLS BASED ON THEIR FUNCTIONS AND OPERATIONS

Whenever you perform a task in the workshop you must use personal protective clothing and
equipment (PPE) that are appropriate for the task and which conform with your local safety
regulation policies.

Your skill using tools and equipment will make your work less difficult and ensure that task
are performed properly and safety.

 Hand tools
 Screwdrivers, needle-nose pliers
 Diagnostic tools
 Analog or Digital Volt-Ohm-Milliammeter, power supply

Safety Check
 Do not use flammable cleaners or water on electrical equipment.
 Make sure designated walkways are kept clear of any obstructions.
 Always wear protective clothing and use the appropriate safety equipment
 Make sure that you understand and observe all legislative and personal safety
procedures when carrying out the following orders.

Proper Use of Hand Tools

 Use the proper type and size of screwdrivers by matching it to screw
 Philips and flat head are the most common type
 Do not over tighten screws because threads may become stripped.

With the aid of hand tools, works makes easier and allow people to be more efficient. However,
majority of the learners often fail to see hazards on these tools can introduce. “HAND TOOL
SAFETY” shows workers how accidents can be significantly reduced.

ACTIVITY:
Direction: Match Colum A with Column B. Write only the letter on a ¼ sheet of paper.
A B
1. Cut the insulation without cutting the wire a. screwdriver
2. Drill holes in the printed circuit board b. long nose
3. Tighten, loosen or remove screws c. wire stripper
4. Remove soldered screws d. 12 V Mini-Drill
5. Hold, bend, stretch the lead of electronic component e. desoldering tool
or connecting wires
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

6. Cut metals f. paint brush

7. Clean dry parts of an object g. hacksaw
8. Produce a magnified image of an object h. signal generator
i. magnifying glass
Quarter: 1 Week: 2 Day: 3 Activity No. 3
Competency: Use Appropriate Tools and Test Equipment
Objective: Arrange the procedures in soldering technique..
Topic: Procedures in using a soldering iron
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PROCEDURE IN USING A SOLDERING IRON

1. Preparing the soldering iron
a) Place the soldering iron on the stand before plug it.
b) Wait a few minutes for the soldering iron to attain its operating temperature of about
400˚C.
c) Wipe the tip of the soldering iron on the wet damp sponge
d) Melt a little solder (soldering lead-60/40) on the tip of the iron
e) Wipe again the tip of the soldering iron on the wet damp sponge.

2. Soldering Technique
a. Hold the soldering iron like a pen, near the base of the
handle.

b. Touch the soldering iron onto the joint to be soldered

c. Apply a small amount of solder onto the joint

d. Remove the solder, then the soldering iron, while keeping

the joint in still position
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

e. Inspect the joint closely. It should look shiny and in a

volcano shape

ACTIVITY:

Direction: Prepare a ¼ sheet of paper and answer the following questions. Write only the letter
on your answer sheet.
A. Inside the box are the illustrations on how to do a good soldering technique. What you are
going to do is to arrange the procedures in a chronological order. Write only the letter.

A. B. C. D. E.

_______1. ________2. ________3. _________4. __________5.

B. Multiple Choice: Select the letter that corresponds the correct answer.
1. Before plugging to main outlet, what soldering tool is used in order you can place your
soldering iron.
a. desoldering tool c. soldering iron
b. soldering tool stand d. wire stripper

2. What is the operating temperature of the soldering iron?

a. 100˚C c. 200˚C
b. 300˚C d. 400˚C

3. What is composition mixture of the soldering lead to be used?

a. 60/40 c. 60/50
b. 40/60 d. 63/37

4. It is a material used to clean tip of the iron.

a. sandpaper c. damp sponge
b. foam d. water

5. What is the term used in melting of a little solder on the tip of the iron.
a. trimming c. cleaning
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

b. tinning d. making

Quarter: 1 Week: 2 Day: 4 Activity No. 4

Competency: Carry out measurement and calculation
Objective: Enumerate the different types of resistor and it features
Topic: Resistor
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Concept Notes:

Electronics is a branch of technology that deals with many applications. audio electronics,
video electronics, digital, medical up to weapons and banking are covered by the influence of
electronics. There are quite a number of components used in application of electronics. To
name a few of these electronic components are resistors, capacitors, inductors and semi-
conductors.

TYPES OF RESISTORS

Wire-wound Carbon composition Resistor in band Precision

Metal film Variable Resistor (Slide type) Variable resistor (rotary type)

Resistor
 most commonly used in electronic components
 offers opposition to the flow of current
 cheapest electronic component
 popular component among students studying electronics

ACTIVITY:

Direction: Prepare a ¼ sheet of paper and answer the following questions. Write only the letter
on your answer sheet.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

A. Enumerate the following:

1-2. Give at least two electronic applications.
3-9. Types of resistor
10-12. Give at least three features of resistor

Quarter: 1 Week: 3 Day: 1 Activity No. 1

Competency: Carry out measurement and Calculation
Objective: Calculate the exact value of resistor using color coding chart
Topic: Resistor Color Code and Coding Chart
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

One of the distinct feature of this resistance – giving component is the way its value is
determined. It uses a set of colors which follows a code for its assumed resistance expressed in
OHMS.
RESISTOR COLOR CODES
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

EXAMPLE: Four Band Color Resistor

1. BROWN – BLACK – BROWN - GOLD

1 0 x 10 ± 5%
10 x 10 = 100 ohms ± 5%

2. YELLOW – VIOLET – YELLOW - SILVER

4 7 x 10000 ± 10%
47 x 10000 = 470,000 Ohms ± 10%

3. RED – BLACK – BLACK – GOLD

2 0 X 1 ± 5%
20 X 1 = 20 Ohms ± 5%

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet
Multiple Choice. Choose the best answer write only the letter on your answer sheet.
1. What is the value of a resistor with the following colors:
GREEN – BLACK – ORANGE – GOLD?
a. 500 Ohms ± 5% c. 50,000 Ohms ± 5%
b. 5,000 Ohms ± 5% d. 500,000 Ohms ± 5%

2. What is the color of the tolerance representing ± 5%?

a. Gold b. Green c. Orange d. Silver

3. Resistor is a component that opposes?

a. current b. capacitance c. power d. voltage
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

4. Find out the exact value of the resistor having a color?

RED – RED – RED – SILVER
a. 2,100 Ohms ± 5% c. 2,200 Ohms ± 10%
b. 2,200 Ohms ± 5% d. 2,100 Ohms ± 10%

5. What is the value of resistor having a color?

BLUE – RED – YELLOW – GOLD
a. 620,000 Ohms ± 5% c. 620,000 Ohms ± 10%
b. 62,000 Ohms ± 5% d. 62,000 Ohms ± 10%

Quarter: 1 Week: 3 Day: 2 Activity No. 2

Competency: Select measuring instrument (VOM)
Objective: Identify the Basic Parts of an Ohmmeter
Topic: Ohmmeter
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

OHMMETER
 a measuring instrument used to determine the resistance of a component or equipment.
This instrument will help in knowing the actual resistance of resistor we use.
 Ohmmeter in electro-electrical laboratories nowadays is embedded in a multi-function
testing instrument called (Volt-Ohmmeter-Milliammeter) VOM.

Volt-Ohmmeter-Milliamemter

Parts of an Ohmmeter

1. Pointer or Needle Pointer – the most important part of

the ohmmeter. It indicates the value of electrical quantity that
has been measured.

2. Ohmmeter Scale – None-linear scale where reading of the

resistance is based. It is usually found in the uppermost part of
VOM.

3. Range Multiplier – The portion of the ohmmeter where the

actual reading is being multiplied.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

4. Zero Ohm Adjustment – the portion of the ohmmeter

where it is adjusted when the pointer of the ohmmeter fails to
point zero.

5. Test Prove –serves as the input portion of the ohmmeter. It has

the red test prove as positive while the black one negative.

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Multiple Choice: Choose the correct answer and write only the letter on your answer sheet.

1. The portion of the ohmmeter where it is adjusted when the pointer of the ohmmeter fails to
point zero.
a. zero ohm adjustement c. range multiplier
b. ohmmweter scale d. pointer

2. Serves as the input portion of the ohmmeter. It has the red test prove as positive while the
black one negative.
a. zero ohm adjustement c. test prove
b. ohmmweter scale d. pointer

3. None-linear scale where reading of the resistance is based. It is usually found in the uppermost
part of VOM.
a. zero ohm adjustement c. test prove
b. ohmmweter scale d. pointer

4. The most important part of the ohmmeter. It indicates the value of electrical quantity that has
been measured.
a. zero ohm adjustement c. test prove
b. ohmmweter scale d. pointer

5. The portion of the ohmmeter where the actual reading is being multiplied.
a. zero ohm adjustement c. test prove
b. ohmmweter scale d. range multiplier

6. A measuring instrument used to determine the resistance of a component or equipment.

a. voltmeter c. galvanometer
b. ohmmeter d. ammeter

B. Name the following ohmmeter parts

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

1. 3.

2. 4.

Quarter: 1 Week: 3 Day: 3 Activity No. 3

Competency: Select appropriate measuring instrument for specific task
Objective: Recognize the different ohmmeter ranges used in VOM
Topic: Procedure on how to interpret resistance reading in an ohmmeter
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PROCEDURE ON HOW TO INTERPRET RESISTANCE READING IN AN

OHMMETER
1. Know the value of individual calibration in the ohmmeter scale.
An ohmmeter scale is nonlinear which means the value of one line of calibration may not be
true to other lines. It is therefore proper to assign values to every line for proper and accurate
interpretation.

The scale can be divided into eight areas where individual treatment has to be made. Several
mathematical computations will be involved to show manner how values of individual lines are
resolved.
Areas involved are: 0-2, 2-10, 10-20, 20-50, 50-100, 100-200, 200-300, 300-500
Value of 1 calibration = line distance/total calibrations
For 0-2: For 2-10:
Line distance = 2 Line distance = 8
Total no. of cal. = 10 Total no. of cal. = 16
Value 1 line = 2/10 Value of 1 line = 8/16
= 0.2 =0.5
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

For 10-20: For 20-50:

Line Distance = 10 Line distance = 30
Total no. of cal. = 10 Total no. of cal. = 15
Value of 1 line = 10/10 Value of 1line = 30/15
= 1.0 = 2.0

For 50-100: For 100-200

Line distance = 50 Line distance =100
Total no. of cal. = 10 Total no. of cal. = 5
Value of 1 line = 50/10 Value of 1 line = 100/5
=5.0 =20

For 200-300: For 300-500:

Line distance = 100 Line distance = 200
Total no. of lines = 2 Total no. of cal. = 2
Value of 1 line = 100/2 Value of 1 line = 200/2
= 50 = 100
2. Identify the appropriate range multiplier to be used, range multiplier is from R X1, X10, R
X100, R X1K, and R X10K

3. Connect the metallic part of the test probes and take note if the pointer points at zero. If not,
adjust the zero ohm adjustment to zero.

4. Make necessary resistance measurement

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Choose the correct answer and write the letter only.

1. What instrument that is used to measure resistance?

a. ammeter c. voltmeter
b. ohmmeter d. wattmeter

2. From what part of the ohmmeter do you derive resistance reading?

a. range multiplier c. test probes
b. reading scale d. pointer

3. What is the lowest range multiplier in an ohmmeter?

a. R X1 c. R X100
b. R X10 d. R X1K

4. The reading scale of the ohmmeter is of what type?

a. horizontal c. nonlinear
b. linear d. vertical

5. In what instrument can you find the ohmmeter?

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

a. ammeter c. DMM
b. tube tester d. VOM

6. For 100-200, what is the value per calibration or the equivalent value per line?
a. 5.0 c. 20
b. 50 d. 100

7. For 0-2, what is the value per calibration or the equivalent per line?
a. 2.0 c. 1.0
b. 0.5 d. 0.2

8. What is the highest range multiplier in an ohmmeter?

a. R X1 c. R X10K
b. R X10 d. R X1K

Quarter: 1 Week: 3 Day: 4 Activity No. 4

Competency: Select measuring instrument (VOM)
Objective: Identify electronic measuring instrument
Topic: Electronic Measuring Instrument
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

ELECTRONIC MEASURING INSTRUMENT

Aside from hand tools, measuring instruments are also needed for more accurate and
quality output. In this connection, three of the most used instruments are presented. You must
be familiar with their uses and proper way of maintaining them.

Volt-Ohm-Milliammeter
 An equipment that combines three functions as a voltmeter that
measures both AC and DC voltages; an Ohmmeter that
measures resistance and continuity; and as milliammeter that
measure small amount of DC current. As safety precautions in
maintenance of this instrument.

Safety precautions and maintenance of Volt-Ohm-Milliammeter

 Always rest the function switch at 250V AC, if an OFF position is now available in the
instrument.
 For current and voltage measurement, always set the function switch in the correct
setting which is a little higher than expected current or voltage present in the circuit.
 Place the instrument in a cool dry place away from any magnetic devices and free from
vibrations.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Oscilloscope
 An electronic test equipment that allows signal voltages to be viewed, usually as a two
dimension graph of one or more electrical potential differences (vertical axis) plotted
as a function of time or of some other voltage(horizontal axis)

Signal Generator
 A device which produce simple waveforms.
 Contain an electronic oscillator
 Capable of creating repetitive waveform.

Oscilloscope and Signal Generator should be given regular check-up for at least once a
week by connecting them to the powerline. This will prevent components from having
moisture that might cause trouble in their circuits.

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Choose the correct answer and write the letter only.

1. What instrument that serves as 3 measuring instrument in one?

a. audio generator c. signal generator
b. oscilloscope d. VOM

2. A device that produces simple waveforms

a. audio generator c. signal generator
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

b. oscilloscope d. VOM

3. What range should the function switch rested if an OFF position is not available in VOM.
a. 10 VDC c. 100 VAC
b. 50 VAC d. 250 VAC

4. Place the instrument in a cool dry place and away from any____________ devices.
a. other instruments c. magnetic devices
b. audio amplifiers d. digital sources

5. A measuring that should be given a regular check-up by connecting them to powerline.

a. capacitor tester c. oscilloscope
b. DMM d. VOM

6. For current and voltage measurement, always set the function switch in the correct setting
which is a_______ than expected current or voltage present in circuit.
a. lower c. higher
b. much lower d. much higher

7. Which of the following does not belong to the group?

a. oscilloscope c. VOM
b. signal generator d. soldering iron

8. Oscilloscope is commonly abbreviated as?

a. CRV c. CRD
b. CRO d. CRT
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 4 Day: 1 Activity No. 1

Competency: Prepare the identified electronic component from the identified electronic
diagrams
Objective: Identify the different types of electronic diagram
Topic: Types of Electronic Diagram
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

When purchasing a brand new appliances or equipment, it is very important that a diagram is
included with the product to insure that there will be a reference material in case the appliance
or equipment becomes defective.

TYPES OF ELECTRONIC DIAGRAM

1. Schematic Diagram
 This type of electronic diagram is by far the most
common. In this form, electronic components are
represented by their symbols

2. Pictorial Diagram
 Pictorial diagram show how the actual
component are physically connected. This is use
for actual assembly of a project

3. Block Diagram
 A block diagram is very useful because it gives
the flow or paths of signal and waveforms of
each block or stages.in block diagrams, the
building blocks of the circuit are shown. This
type employs circles, triangles, or rectangles to
represent a whole group of electronic
components. Block diagram are most often
used in the preliminary design of a circuit, or
to simplify the explanation of a given circuit.

To produce a quality and marketable electronic diagram, you have to follow Electronic
Drafting Standards which is the process of illustrating various kinds of circuits and wiring
system.
Most common graphical languages used in the illustration of components in circuits and
wiring system are block, schematic, wiring and pictorial diagrams.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Identify the following diagram.

_________________1.

_________________2.

_________________3.

________________4.

B. Answer the following questions

1. Which of the diagram is the most commonly used by technicians?
2. A diagram that employs circles, triangles, or rectangles to represent a whole group of
electronic components.
3. It show how the actual component are physically connected.
4. Why is it important of having a diagram?
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 4 Day: 2 Activity No. 2

Competency: Prepare the identified electronic component from the identified electronic
diagrams
Objective: Draw the drawing instruments and label their description and so as the
uses
Topic: Types of Electronic Diagram
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

SCHEMATIC SYMBOLS OF ELECTRONIC COMPONENTS

Drawing instrument are used in preparing accurate drawings. Quality drawing instruments can
produce accurate and good presentable drawings.

Schematic Symbols of Electronic Components

Electronic Templates

Drawing Instrument and Materials Used in Electronic Drafting

1. Drawing board
 A smooth board usually rectangular in shape
provided with perfectly straight edge which is used as
working edge on which the T-square is move while
making drawings.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

2. T-Square
 A T-Square consist of two parts namely stock and
the blade joined together at right angles to each
other by means of screws. The stock is made to
slide along the working edge and the blade moves
on the drawing board. The working edge of a T-
Square is used to draw parallel lines, vertical lines
or inclined at 30 or 60 degrees.

3. Drafting Machine or Drafter

 In a drafting machine, the uses and advantages of T-Square, scales, set squares and
protractors are combined. One end of the drafter is clamp at the left top end of the
drawing board by a screw provided in the drafter.

4. Set Square
 Generally made from plastic material. They are
triangular in shape with one corner, a triangle.
A pair of set squares (30˚-60˚) and 45˚. They
are used to draw lines at 30˚, 60˚ and 45˚ to the
vertical or horizontal.

5. Protractor
 Used to mark or measure angles between 0 to 180˚.
They are semi-circular in shape and are made of
plastic. Protractors with circular shape are capable
of marking and measuring 0 to 360˚ are also
available in the market.

6. Drawing Pencil
 the accuracy and appearance of a drawing depends
on the quality of pencil used to make drawing.
The grade of the pencil lead is marked on the
pencil. HB notes medium grade. Increase in
hardness is shown by value put in front of H such
as 2H, 3H, etc. Softer pencil are marked 2B, 3B,
and 4B etc. A pencil marked 3B is softer than 2B
and pencil marked 4B is softer than 3B and so on.
Beginning of a drawing maybe made with H or 2H.
For lettering and dimensioning, H or HB pencils are
used.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

7. Compass
 used for drawing circles and arcs of circles. The
compass has two legs hinged at one end. One of the
leg has pointed needle fitted at the lower end
whreasnthe other provision for inserting pencil lead.

8. Drawing Pins and Clips

 used to fix the drawing sheet on the drawing board.

PERFORMANCE TASK:
Directions: Prepare a one (1) whole sheet of long bond paper. Draw at least five (5) drawing
instruments, Describe and give the function of each.
Drawing Instrument Description Use
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 4 Day: 3 Activity No. 3

Competency: Identify the proper electronic component or its equivalent value for the
given electronic diagram
Objective: Identify the different electronic symbols
Topic: Basic Electronic Diagram
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Schematic Diagram
 is a representation of the elements of a system using abstract, graphic symbols rather
than realistic pictures.
Electronic Symbols
 is a pictogram used to represent various electrical and electronic devices or functions,
such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical
or electronic circuit.
BASIC ELECTRONIC SYMBOLS
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

Matching Type: Match the electronic symbols in Column A with the corresponding description
in Column B. Write the letter of your answer.
A. B.
1. a. Bridge Rectifier

b. Fuse
2.
c. PNP transistor

3. d. NPN transistor

e. Resistor
4.
f. transformer

5. g. Capacitor

h. battery
6.
i. IC

7. j. ground

k. Zener diode
8.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 4 Day: 4 Activity No. 4

Competency: Describe the electronic component being asked based on the electronic
diagram
Objective: Enumerate the kinds of resistor
Topic: Resistor
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Resistor
 a device with a known value of resistance
 reduce voltage and to limit the flow of current in a circuit.
Resistance
 the opposition of the component or material offers to the flow of current.

Symbol of Resistor

Fixed Variable
Fixed Resistor
A single value resistance, which remains the same under the normal condition. The two
common kinds of fixed resistors are carbon resistor and film type resistor.

Carbon Resistor Film Resistor

Variable Resistor
 used when it is necessary to change the amount of resistance in a circuit. There are two
common variable resistors, the potentiometer and rheostat. Potentiometer has a carbon
resistive element while the rheostat is made of resistance wire.

Potentiometer Rheostat
Both devices have sliding arm that brings into contact with the resistance element. Most
variable resistors the arm is attached to the shaft that can be adjusted.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

A potentiometer is commonly used as control device. It can vary the value of voltage applied to
a certain circuit such as in the amplifier, television, and different kinds of meter circuit.
Resistor Power Rating
Power rating of resistor changes with their sizes, the bigger the resistor the greater the wattage
and the smaller the resistor the lesser the wattage.

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Answer the following questions.

1. A device in which main function is to reduce voltage and to limit the flow of current in a
circuit.
2. A component used to change the amount of resistance in a circuit.
3. Draw the symbol of a variable resistor
4. True or False? A potentiometer has a sliding arm that bring contact with the resistive element.
5-6. Two common kinds of resistor
7-8. Two types of variable resistor
9-10. Give at least two power ratings of a resistor.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 5 Day: 1 Activity No. 1

Competency: Describe the electronic component being asked based on the electronic
diagram
Objective: Draw the different Electronic Components
Topic: Capacitors and Other Electronic Components
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Capacitor
 a device that consist of two conducting surfaces separated by a dielectric material like
air, paper, mica, ceramic, glass or mylar.
 Store electric energy
 Designed to have a definite amount of capacitance

Capacitance
 a property that exist whenever insulating material permits the storage of electricity.
 ability of a component or circuit to collect and store energy in the form of an electrical
charge.

Characteristics of a Capacitor
1. It can store electrical charge even though the voltage source is already disconnected.
2. It can discharge electrical voltages

Symbols of Capacitor

Fixed Variable Polarized

Common Types of Capacitor

Aluminum Electrolytic Capacitors (Polarized)
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Ceramic Capacitor

Variable Capacitors
 used for tuning capacitor for radio receivers.

Semiconductor (Diodes)
 device with two terminals,
typically allowing the flow
of current in one direction
only

Bipolar Junction Transistor

Integrated Circuits (IC)

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

PERFORMANCE TASK:
Directions: Prepare a one (1) whole sheet of long bond paper. Draw the schematic symbol and
physical appearance of the following electronic components and give the function.
Type/Symbol Actual/Physical Appearance Use/Application
NPN Transistor

Zener Diode

Polarized Capacitor

Light Emitting Diode

PNP Transistor

Battery

Variable Capacitor

Potentiometer
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 5 Day: 2 Activity No. 2

Competency: Interpret technical drawing
Objective: Identify the different electronic diagrams
Topic: Electronic Diagrams
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

All electronic circuits from the simplest to the most complex design need diagrams to be used as
reference in designing, modifying and troubleshooting the circuit. The most common used
electronic diagrams are schematic, pictorial, wiring and block diagram. Each of these diagrams
has its own unique characteristics in representing the circuit.

Pictorial Diagram
 Shows the pictures of the actual components
and wiring connections although it does not
provide the exact size of the components. It
shows the exact shape and proportion to the
actual component or device.

Block Diagram
 Usually uses block of squares,
rectangles or triangles to represent
components, group of components or
units of equivalent. Block diagrams are
particularly used to represent internal
components of an integrated circuit.

Schematic Diagram
 A diagram that shows the components
used in their connection. Each graphic
symbol is also accompanied with
reference designation to distinguish it
from other similar symbols. It does not
illustrate the physical size, shape or
chassis location of component parts and
device.
Wiring Diagram
 it shows wiring connection in a simplified, easy to
follow manner. It may show either internal or
external connection or both and is usually drawn
as a simple as possible to trace out the connection
of a circuit. The
components of the circuit are identified by name
or a represented by means of pictorial illustrations
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Shown below are the different electronic diagrams. Write the name of the diagram in a
¼ sheet of paper.

1. 4.

2.

5.

3.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 5 Day: 3 Activity No. 3

Competency: Identify the proper electronic component or its value for the given
electronic diagram
Objective: Identify the different electronic diagrams
Topic: Electronic Components and its Symbols
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

ELECTRONIC COMPONENTS AND ITS SYMBOLS

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

Matching Type: Match the electronic symbols in Column A with the corresponding description
in Column B. Write the letter of your answer.

1. a.

2. b.

3.
c.
4.

d.
5.

e.
6.
f.

7.
g.

8.
h.

i.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 5 Day: 4 Activity No. 4

Competency: Interpret working plans and electronic diagrams
Objective: Recognized the reference designation of components
Topic: Rules for Drawing Symbols
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

One of the features of a quality electronic diagram is its appearance with simplicity in design
and easy to understand layout. To achieve this, follow the standards in laying out electronic
diagrams.
RULES FOR DRAWING SYMBOLS
Recommended practice to be used in the application of symbols to a circuit design.
1. The position of a symbol does not affect its meaning.
2. The weight of a line used in drawing a symbol does not affect its meaning. In some cases a
heavier line may be used to emphasize a particular symbol.
3. A given symbol maybe drawn in any size that is suitable for use in any particular diagram.
However when a symbol is enlarge or reduce in size, it should be drawn in portion to the rest of
the drawing.
4. If necessary for contrast, some symbols maybe drawn smaller or larger than the other symbol
on the diagram. However simplicity is recommended that not more than two different sizes of
symbols be used on any one diagram.
5. In general, connecting line should be brought to a symbol either vertically or horizontally,
but a connecting line brought to a symbol to an angle has no particular significance unless
otherwise noted.
6. The arrow head of the symbol maybe open or closed ( ) unless otherwise noted.
7. The standard symbol for terminal (0) maybe added to any symbol. But when this is done, the
terminal symbol should not be considered a part of symbol.
REFERENCE DESIGNATIONS
The symbol used to represent various components on a circuit diagram are most often
accompanied by combination of letters that identify the components but are not themselves a
part of the symbol.
Reference Designations of Electronic Components
Components Class Designation Letter(s)
Capacitor C
Diode D
Resistor R
Switch S or SW
Transformer T
Transistor Q or TR
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

When more than one symbol of a specific type of component appears on a diagram the letter or
(letters) is followed by numbers that identify the components. These combination of letters and
numbers are referred to as reference designation.

Recommended method of indicating reference designation and component values.

When details of the type, rating or value of a particular component to be given on a diagram, this
information is placed adjacent to the symbol or is given by means of notes accompanying the
diagram. For example resistance and capacitance values are indicated on the picture above. In
this scheme the symbol Ω for ohms and the abbreviations uf and pf for capacitance values are
usually omitted and are instead replaced by notes such as following.
1. All resistor expressed in ohms unless otherwise indicated
2. All capacitors expressed in microfarads unless otherwise indicated.
 Resistance value of 1,000 ohms or more is most often expressed in terms of Kilo (K) or
Meg ohm (M) units.
For example 4,700 Ω is equivalent to 4.7KΩ
1,000,000Ω is equivalent to 1M
Capacitance values of 1 through 9,999 = picofarads
10,000 greater = microfarads

Suffix Letters
 used to identify separate parts of a unit upon a diagram when such components appear as
a single. Or an enclosed unit.
Layout
 the parts of the diagram should be carefully space to provide an even balance between
blank spaces and lines
 enough blank space should be left in the areas near symbols to avoid crowding and
necessary notes or reference information.

Line Thickness
 line weights or line conventions is used in drawing electrical and electronic diagrams.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Line Application Line Thickness

For general use Medium
Mechanical connection, shielding and future Medium
Circuits line
Bracket-connecting dash line Medium
Bracket and leader lines Thin
Boundary of Mechanical grouping Thin
For Emphasis Thick

Connecting Lines
 line connecting symbols and other parts on
the diagram should be drawn either
horizontal or vertically.
 More than three lines should be drawn to
any point on a circuit.

Interrupted Lines
 Connecting lines whether single or in groups,
maybe interrupted when a diagram does not
provide for a continuation of these line to their
final destination.
 If a single line is interrupted the line
identification can also indicate the destination.
 If group of lines are interrupted, the destination of
the lines is usually given in conjunction with
brackets.
 The lines should be located close as possible to the point of interruption

Dashed Lines
 Dashed lines ( ) are used on schematic and
other types of diagrams to show a mechanical
linkage between component or parts of components.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

1. A letter designation is written near or beside a symbol to indicate what type of component that
symbols is. The letter designation for transistor__________.
a. Q c. S
b. R d. T

2. These types of illness are used to show mechanical linkages between components or parts on
schematic diagram.
a. connecting lines c. medium lines
b. dashed line d. thin lines

3. This punctuation mark is used to show the destination of grouped interrupted lines in a
diagram.
a. bracket c. open and close quotations
b. comma d. question mark

4. To avoid crowding of any necessary notes or reference information, enough blank space
should be left in areas near. Which of the following elements on a schematic diagram should be
considered?
a. component labels c. dashed lines
b. connecting lines d. symbols

5. In a schematic diagram, values of resistor are usually labelled in this unit otherwise noted by
the manufacturer.
a. KΩ c. Ohms
b. MΩ d. resistance
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 6 Day: 1 Activity No. 1

Competency: Interpret working plans and electronic diagrams
Objective: Redraw the schematic diagram by following the Rules for Drawing
Symbols
Topic: Redrawing of six input mixer
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:
Directions: Prepare a one (1) whole sheet of long bond paper. Redraw the schematic diagram of
a six input mixer. Label all the components using values listed as parts list. Be sure to follow the
rules in drawing symbols.
Job Plate No. 2
Title: Schematic Diagram of Six Input Audio Mixer Filter
Tools and Materials Needed:
1 pc. – drawing pencil 1 pc. - 45 x 45 triangle (optional)
1 pc. – bond paper long 1 pc. – schematic diagram guide
1 pc. – ruler 1 pc. - 30 x 60 triangle (optional)
1 pc. – eraser 1 pc. – T-Square (optional)

Schematic diagram guide

Parts List:
R1 – R6 = 22K Ω R16 = 68Ω
R7 –R12 = 39K Ω R17 = 1K Ω
R13 = 100K Ω C1 – C6 = 10uf/16V
R14 = 2.2K Ω C7 – C8 = 47uf/16V
R15 = 6.8KΩ Q1 = 2SC945
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Sample of finished performance task:

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 6 Day: 2 Activity No. 2

Competency: Interpret working plans and electronic diagrams
Objective: Apply the standard drafting practice by redrawing the diagram of 30 watt
audio amplifier
Topic: Redrawing of 30 watt audio amplifier
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:
Job Plate No. 3
Title: 30 Watts Audio Amplifier
Directions: Prepare a one (1) whole sheet of long bond paper. Redraw the diagram of a 30 watt
audio amplifier, apply the standard drafting practice Label all the components using values listed
as parts list. Be sure to follow the rules in drawing symbols.
Tools and Materials Needed:
1 pc. – drawing pencil 1 pc. - 45 x 45 triangle (optional)
1 pc. – bond paper long 1 pc. – compass
1 pc. – ruler 1 pc. - 30 x 60 triangle (optional)
1 pc. – eraser 1 pc. – T-Square (optional)

Schematic diagram guide

Parts List:
R1, R14 = 1KΩ R12 = 470Ω trimmer C=10uf/10V Q6=MPSAS06
R2 = 100KΩ R13 = 560Ω C2 =0.001uf/50V Q7=2N6717
R3, R8 = 10KΩ R15 = 27KΩ C3 = 50uf/10V Q8=2N6729
R4 = 680Ω R16, R27, R30 = 1.2KΩ C4,C5,C6 =0.1uf/50V Q9=MJ2955
R5, R26, R31 = 5.6KΩ R17 = 120Ω C7 = 0.002uf/50V Q10=2N3055
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

R6 = 3.9KΩ R19, R20, R21, R22 =1Ω Q1,Q2 = MD8002 Q11=MPSL01

R7, R10, R18, R2 = 100Ω R24, R25, R32, Q3 = MPSA70 Q12=MPSL51
R9, R28, R29 = 470Ω R33, R34, R35= 330Ω Q4 = MPSA56 Q13MJE3440
R11 = 10Ω R36, R37 = 10Ω Q5 = MPSA20 D1 = IN5242B
D2, D3 =IN5236

Sample of the finished Performance Task

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 6 Day: 3 Activity No. 3

Competency: Interpret working plans and electronic diagrams
Objective: Identify component value based on schematic diagram given
Topic: 50 watt booster amplifier
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:
Job Plate No. 4
Title: 50 Watt Booster Amplifier
Directions: Prepare a one (1) whole sheet of long bond paper. In figure A-1 shown a schematic
diagram 50 watt amplifier booster and in figure B-1 is the pictorial diagram. Redraw the
pictorial diagram of a 50 watt audio amplifier and write in the name of component/devices
indicated by arrows and give their functions.
Tools and Materials Needed:
1 pc. – drawing pencil 1 pc. - 45 x 45 triangle (optional)
1 pc. – bond paper long 1 pc.- compass
1 pc. – ruler 1 pc. - 30 x 60 triangle (optional)
1 pc. – eraser 1 pc. – T-Square (optional)

Figure A-1 Schematic Diagram

Figure B-1 Pictorial diagram 50 watt booster

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Fill-up the following table

Name of components, devices and their functions
Name the component /device Circuit function
1.
2.
3.
4.
5.
6.
7.
8.

Sample of the finished performance task

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 6 Day: 4 Activity No. 4

Competency: Interpret working plans and electronic diagrams
Objective: Redraw the schematic diagram using the standard drafting process
Topic: AM audio receiver
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:

Job Plate No. 5

Title: AM Audio Radio Receiver
Directions: Prepare a one (1) whole sheet of long bond paper. Redraw the diagram of a discrete
audio amplifier of a typical radio receiver shown below which is NOT properly drawn. Be sure
to make your diagram more presentable by following the Standard Drafting Practice.
Tools and Materials Needed:
1 pc. – drawing pencil 1 pc. - 45 x 45 triangle (optional)
1 pc. – bond paper long 1 pc.- Compass
1 pc. – ruler 1 pc. - 30 x 60 triangle (optional)
1 pc. – eraser 1 pc. – T-Square (optional)

Schematic diagram of AM audio radio receiver

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Sample of finished performance task

 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 7 Day: 1 Activity No. 1

Competency: Identify health hazards and occupational risk
Objective: Identify the different warning and safety signs
Topic: Hazard and Safety Sign
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

In every field of work, there are safety precautions and practices to be followed to prevent
accidents. Sometimes before an accident occurs a warning is given, so the individual concern
can prepare for the undesirable eventualities. In some situations, no warning at all is served
and anyone is caught by surprise.
HAZARD AND SAFETY SIGNS
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

Matching Type: Match the hazard and safety signs in Column A with the corresponding
description in Column B. Write the letter of your answer.
1. Laser a.

2. High Voltage
b.
3. CCTV operation
c.
4. Emergency exit
d.
5. Wear gloves
. e.
6. Caution stairs
f.
7. First aid station
g.
8. No Smoking
h.

i.

j.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 7 Day: 2 Activity No. 2

Competency: List down the different hazards and risk found in the workplace
Objective: Recognize the hazard and risk at workplace
Topic: Hazards and Risk
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

In areas where student are acquiring basic technical skills, safety begins the moment they enter
the work area or even before reaching the work area. Identifying health hazard and occupational
risk is indispensable.
Point to consider as health hazards and occupational risk
1. Electrical Hazard
 A hazard or risk that is more fatal
Example: Electrical shock from open wire, grounded electrical appliances

2. Improper Use of Hand Tools

 Cutting tools may inflict injuries when improperly handled due to their sharp edges.

 Driving tools like screwdrivers and hammers, when used improperly can break human
flesh or fracture bones.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

 Boring tools such as portable electric drill, 12v mini-drill, drill bits and reamer also do
damage when not properly used.

 Soldering tools such a soldering iron, soldering gun and hot air soldering cause extreme
heat and can burn the skin when improperly used.

Other hazards and risk can be caused by objects not properly placed in laboratory area
where crumbling or falling is highly possible. Objects place on the top of a cabinet can be very
dangerous as well.

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.
A. Answer the following questions.
1-2. What are the hazard and occupational risk commonly meet in workplace?
3-6. Give at least four hand tools that can cause injuries when improperly use.
7-8. Give at least two example causes of electrical hazard.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 7 Day: 3 Activity No. 3

Competency: Observe occupational health and safety practices
Objective: Recognize safety rules and safety requirements especially at workplace
Topic: Tool Maintenance and Safety Rules
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

TOOL MAINTENANCE AND SAFETY RULES

To last longer when properly kept and maintained. A good worker keeps and cares for his
tools. Here are the pointers to follow in keeping hand tools in good condition.
1. Be sure to inspect tools before using them. This is to check if they are in good working
condition.
2. After using a tool, clean it thoroughly with a damp cloth before keeping it in a tool box or
cabinet.
3. Oil the metal parts of a tool to prevent any form of damage caused by air, water or rust.

SAFETY RULES
1. Avoid wearing loose clothing when working. Sleeves should be fit and shirts tucked in as
much as possible. Remove ties, watches, rings and other jewelry from your body.
2. Report immediately injuries or accidents of any type to your teacher
3. Never put fasteners or nay small metal articles in or near your mouth when working.
4. Never throw tools of any type around. Make sure the sharp edge cutting tools are away from
the edge of the table or work bench.
5. Keep working areas clean and free from disposable materials.
6. Secure help to your classmate when carrying heavy tools to avoid accidents.
7. Never use dull or damaged tools
8. Do not use tools with loose handles and ragged. Report cases like these to the teacher and
do the necessary repair and adjustment if possible.
9. Know and observe safety measures specific for each tool or operation.

SAFETY REQUIREMENTS
For your protection, observe the following safety requirements.
 Follow all caution, warnings, and instruction marked on the equipment.
 Ensure that the voltage and frequency rating of the power outlet matches the electrical
rating labels on the system,
 Use properly grounded outlets.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

A. Fill the missing words. Write your answer on a separate sheet of paper.
1. Follow al___________, warnings, and instruction marked on the equipment.
2. Never use ____________ or damaged tools
3. Use properly ___________ outlets.
4. Secure help to your classmate when carrying heavy tools to avoid _____________.
5. Know and _________safety measures specific for each tool or operation.
6. ________ the metal parts of a tool to prevent any form of damage caused by air, water or rust.
7. Be sure to _______ tools before using them. This is to check if they are in good working
condition.
8. Report immediately injuries or ________ of any type to your teacher
9. After using a tool, ________it thoroughly with a damp cloth before keeping it in a tool box or
cabinet.
10. Do not______ tools with loose handles and ragged. Report cases like these to the teacher and
do the necessary repair and adjustment if possible.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 7 Day: 4 Activity No. 4

Competency: Prepare checklist on observations of occupational health and safety
Objective: Supply the missing word to complete the safety selection and set-up.
Topic:
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Hand Tool Design, Selection and Set-up

1. Weight
 Use the lightest weight tool as possible to avoid injury. Excessive heavy tools must be
equipped with mechanical support.

Support –tools with some means of mechanical support so

you don’t need to hold a heavy tool continuously while
working.

2. Balance
 The tool’s center of gravity should be closed to the body, close
to the handles and in line with the center of the hand holding
tool.

3. Torque Control
 High torque requires a lot of force to keep the tool from
rotating out of your hand. Torque settings should be set to the
minimum required by job specifications, especially for line
and pistol shape tools.

4. Grip
 Tool handle should allow stable and
efficient grip. The handle should be
cylindrical or oval in shape, with a
diameter of between 1.25 and 1.75
inches. Tool handle should contact as
much of the hand and finger as possible.
Grips should be made of bon-slip
compressible and non-conductive
material. Handles should be kept clean
and free from slippery, grease, oil or sweat.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

5. Span
 On two andled manual tools like pliers, the open span should be
about 4 inches and the closes span should only be about 1.5
inches.

6. Spring loaded handle

 A spring loaded mechanism saves muscular effort and reduces mechanical stress on the
backs and sides of fingers for such tools as scissors, pliers and manual cutting and
gripping tools which have to be opened and closed repeatedly during use.
7. Choose the right tool shape
 Pistol shaped tools should be used on a vertical surface or on a horizontal surface
below waist height. Bend the tool not the wrist.

8. Avoid bending over your work

9. Avoid overhead work if possible. Use ladder to

reduce the need for outstretched arms.

10. Keep the elbow close to the body

11. Tilt the work surface instead of the wrist

12. Stand with weight evenly distributed on both feet. When

standing for long period of time, rest one foot on a sturdy object
above floor height and switch legs periodically.

13. Sit up straight so the chair offer good back

support. Adjust the chair back so it comfortably
supports the natural curve of the lower back. Adjust
seat height to allow thighs to parallel to the floor.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ½ sheet of paper as your answer sheet and answer the following questions.

A. Fill the missing words. Write your answer on a separate sheet of paper.
1. High torque requires a lot of __________ to keep the tool from rotating out of your hand
2. Use the _________ weight tool as possible to avoid injury
3. The tool’s center of ________should be closed to the body, close to the handles and in line
with the center of the hand holding tool.
4. Sit up straight so the chair offer good back support. Adjust the chair back so it comfortably
supports the natural curve of the lower back. ________seat height to allow thighs to parallel to
the floor
5. _________ the work surface instead of the wrist
6. Avoid __________ over your work
7. Pistol shaped tools should be used on a vertical surface or on a horizontal surface
below______ height. Bend the tool not the wrist
8. ____________settings should be set to the minimum required by job specifications,
especially for line and pistol shape tools.
9. Tool handle should __________as much of the hand and finger as possible.
10. Keep the _________ close to the body
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 8 Day: 1 Activity No. 1

Competency: Observe occupational health and safety practice
Objective: Identify the type personal protective equipment and its protection in our
body.
Topic:
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Personal Protective Equipment (PPE) refers to protective clothing, helmet, goggles or

other garment designed to protect the wearer’s body from injury by blunt impacts, electrical
hazards, heat, chemicals and infection. The term ”protective gear” and protective clothing are
in many cases interchangeable; “protective clothing ” is applied to traditional categories of
clothing and “gear” is more general term and preferably means uniquely protective categories,
such as pads, guards, shields, mask, etc

Goggles and safety glasses are form of protective of

protective eye wear that usually close to protect the eye area in
order to prevent particulates or chemicals from striking the
eyes. They are used in chemical laboratories and wood
working.

Safety Mask or protective

Providing a supply of breathable air or oxygen –containing gas
Protecting the face against flying objects or dangerous
environments, while allowing vision
In hospital surgical mask prevents patients from direct
transmission of infectious agents from health care professional
of the surgical area.

Ear plugs and earphones

An earplug is a device that is inserted in the ear canal to
protect the user's ears from loud noises, intrusion of water,
foreign bodies, dust or excessive wind. Since they reduce
the sound volume, earplugs are often used to help prevent
hearing loss and tinnitus (ringing of the ears).
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Safety gloves are designed to protect a worker's hands from hazards so

that they can perform their job safely. ... Depending on the job, a worker
may face risks including chemicals, cuts, punctures, abrasions, electrical
hazards and thermal hazards

Safety helmet are designed to protect the head against falling

objects and the side of the head, eyes, and neck from any untoward
impacts, bumps, scrapes, and electrical exposure, etc.

Protective coveralls were created to ensure a high level

of protection during work activities. They cover or
replace personal clothing and their main purpose is to
protect the worker from chemical, biological,
mechanical, thermal, electromagnetic and electrical
hazards.
Safety boots are designed to provide protection from
electrical risks, slipping and chemical spills. They are
equipped with slip-resistant soles, materials that protect the
feet from falling objects and metallic or non-metallic
protective materials, for constant protection of the toes.

BODY PART SOURCE OF DANGER PPE

EYES Splashes of liquid chemicals or metals , dust catalyst Safety spectacles, goggles,
powders, projectiles, gas, steam, and radiation face shield, welding shield
EARS The sound of noise level more than 85 dB. Ear plugs, ear muffs, canal
caps
HEAD Crushed by falling objects, hit by hard objects, rotating Helmets, bump, caps
objects, entangled hair
RESPIRATORY Dust, stem, gas, lack of oxygen (oxygen deficiency) respirators,, breathing
apparatus
BODY Extreme temperature, bad weather, splashes of liquid, Boiler suits, chemical suits,
chemicals and metals, a blast from leaking pressure vest, apron, full suits, jackets
penetration of sharp objects, dust contaminated

HANDS AND Extreme temperatures, sharp objects, crushed by heavy Gloves, armlets, mitts
ARMS objects, electric shock, chemicals, skin infections
FEET Slippery floors, wet floors, sharp objects, falling objects, Safety shoes, safety boot,
chemical splashes, and liquid metals aberration leggings
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

ACTIVITY:
Direction: Prepare a ½ sheet of paper as your answer sheet and answer the following questions.

Identify the following:

A.
1. Are designed to protect a worker's hands from hazards so that they can perform their job
safely
2. Are designed to protect the head against falling objects and the side of the head, eyes, and
neck from any untoward impacts, bumps, scrapes, and electrical exposure, etc.
3. Are designed to provide protection from electrical risks, slipping and chemical spills.
They are equipped with slip-resistant soles, materials that protect the feet from falling
objects and metallic or non-metallic protective materials, for constant protection of the
toes.
4. Are form of protective of protective eye wear that usually close to protect the eye area in
order to prevent particulates or chemicals from striking the eyes.
5. Were created to ensure a high level of protection during work activities. They cover or
replace personal clothing and their main purpose is to protect the worker from chemical,
biological, mechanical, thermal, electromagnetic and electrical hazards.

B. Identify the what body parts can be protected:

1. Canal caps
2. Boiler suit
3. Mitts
4. Safety shoes
5. Breathing apparatus

C. Name the following protective equipment and what particular of body it protects so
as the function.

1. 3.
4.

2.

5.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 8 Day: 2 Activity No. 2

Competency: Conduct preventive maintenance
Objective: Enumerate the guidelines in maintaining and storing tools
Topic: Guidelines in Maintaining and Storing Tools
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Guidelines in Maintaining and Storing Tools

 Keep the hand tools clean and free from ferrous and other contaminants
 Do not use hand tools in direct contact with acetylene, due to the possible formation of
explosive acetyl ides, especially the presence of moisture.
 During normal use, all pliers and screwdrivers will progressively develop some
damage to striking faces of screwdrivers or cutting edge and striking end pliers. As part
of the normal operating and safety procedures, these tools should be returned to
workshop as with steel tools, to have the face and head s redressed this is essential to
prevent eye damage resulting from chips detaching from the item during use.
 Do not use hand tools fitted with wooden handles in places where the handles may dry
out and shrink. This will increase the risk of the handle breaking or the head becoming
loose.
 Tools are designed for specific use. As with any tool. In addition to the probability that
the tool will be damaged, this is dangerous practice for the safety of the operator.
 The accepted standard of safety and maintenance for common steel hand tools must
also be adopted with non-sparking hand tools, in addition to any specific
recommendations resulting from the alloys used.
 When sharpening hand tools, follow normal safety procedures such as the provision of
eye and face protection, adequate extraction and dust collecting facilities.

Electronic Tools Need Special Care and Maintenance

Soldering iron
 Always clean the tip before and after using
 Do not wash the tip just to speed up its cooling process after using it. It might
damage the heating element and corrode the tip
Soldering gun
 be sure to tighten the two nut holding the tip before using it to have maximum heat
transfer to its tip.
 Never use a soldering gun in mass production assembly. It might be overheated and
will consume more power compared to a soldering iron.
Desoldering tool
 Keep it in good condition by cleaning its inside and apply a small amount of oil
regularly.
 Avoid direct contact of the soldering iron’s tip to the tip of the desoldering tool when
doing desoldering work.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Electric drills
These are tools that are used to bore holes in metals, woods, plastic and PCB.
 Before using a drill, be sure to tighten the chuck jaw and secure the drill bit properly.
 The materials to be bored and the drill bit must be at 90˚ angle to achieve efficient
boring operation.

ACTIVITY:
Direction: Prepare a ½ sheet of paper as your answer sheet and answer the following questions.

A. Answer the following questions.

1-2. What are the things to do in order to maintain and care soldering iron.
3-4. How will you care and maintain soldering iron.
5. In using electric drill we must sure that the _______is tighten.
6.-12. Enumerate the guidelines in maintaining and storing tools
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 8 Day: 3 Activity No. 3

Competency: Conduct preventive maintenance
Objective: Enumerate the guidelines in maintaining and storing tools
Topic: Guidelines in Maintaining and Storing Tools
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

Maintaining Hand Tools

Screwdriver
 Select screw driver that fits the screw head slot perfectly
 Keep the screwdrivers handle dry and clean to prevent slippages.
 Never use screwdrivers as chisel
 Never hammer a screwdriver’s handle
Pliers
 Always keep pliers in good condition by cleaning and regular application of oil.
 Never use pliers as substitute for wrench or hammer
 Never hammer pliers when cutting wires
Files
 Keep a firm grip on its handle at all times
 Do not blow filings as they may get into your eyes
 Always use a file card in cleaning a file
Mini Drill

 Hold the mini drill at 90˚with the material to be bored and make sure to tighten chuck
jaw of the mini drill securely before using it.
 Hold the metal, wood, or plastic firmly on the vise when drilling holes. Do not hold
with your hands.
 Clean chips with brush not your hands
 Keep the work area always clean by using paint brush
Pencil type soldering iron
 Clean and maintain the tip of the soldering iron before use.
 PCB recommended soldering iron (30 watts)
 Clean soldering iron with use of dry cloth, cotton, or tissue paper
 Do not wash the tip of the soldering iron with water to speed up its cooling process
after use. It might corrode the soldering iron tip
Soldering gun
 Do not use this type of soldering instrument with light soldering work. It might damage
electronic components and PCB due to high temperature
 Always tighten the two nuts holding the tip of the soldering gun
 Do not use in mass production assembly. It might be overheated
 This type of soldering equipment is more convenient where only few connections are
to be made requiring much higher temperature like direct chassis soldering.
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Desoldering tool

 The heat terminals to be desoldered before sucking the melted soldering leadwith the
desoldering tool to avoid direct contact with the desoldering tool’s tip with tip of the
soldering iron.
 Clean and oil the inside sucking spring and the tip of the desoldering tool regularly so
that melted soldering iron will not stick permanently inside the desoldering iron.
Volt-ohm-Milliammeter

 Do not play with this instrument by holding both test leads or connecting them in any
part of your body trying to measure resistance.
 Rest the function switch at 250VAC when not in use
 Place the instrument in the dry cool place. Free from any vibrations.
 When making current and voltage measurement be sure you are in the correct setting of
function switch. Be sure to set the range higher than the measured voltage or current.
 Avoid touching any metallic part of the test lead when measuring current or voltages.
Oscilloscope and Signal generators

 Connect ot powerline once a week to warm-up circuits and to prevent from any
moisture which lead to corrosion.

ACTIVITY:
Direction: Prepare a ¼ sheet of paper as your answer sheet and answer the following questions.

1. What tool is used to remove solder from PCB?

a. hot air c. soldering pencil
b. soldering gun d. desoldering tool

2. Keep hand tools clean and free from_________

a. dust c. machine oil
b. contaminants d. moisture

3. which soldering tool is used for high temperature soldering?

a. soldering pencil c. soldering gun
b. soldering iron d. hot air

4. What equipment needs to be tested once a week

a. DMM c. Oscilloscope
b. frequency meter d. VOM

5.the correct use of hand tools is always the key to_________

a. project construction c. lab safety program
b. component soldering d. environment compliance

6. Clean the tip with cloth, cotton or tissue paper after using.
a. mini drill c. files
b. soldering iron d. pliers

7. Never use as a chisel

a. pliers c. files
b. screwdrivers d. soldering iron
 Electronic Products Assembly and Servicing 7/8
FIRST QUARTER

Quarter: 1 Week: 8 Day: 4 Activity No. 4

Competency: Conduct preventive maintenance
Objective:
Topic: Guidelines in Maintaining and Storing Tools
Materials:
Reference: Consumer Electronic Servicing- Exploratory Course Grade 7 and Grade 8
Copyright: For classroom use only
DepEd owned

PERFORMANCE TASK:

Directions: Conduct preventive maintenance on any tools you found at your home, and
answer the following questions.

1. What will you do to the tools damaged due to misuse?

2. Check the part of your house that is untidy, what will you do?
3. If you found the tools oily and greasy what is the proper thing to do?

Answer the above questions by filling the matrix below. Do this on a separate answer sheet.

HAND TOOLS CONDITION OF THE HAND ACTION TAKEN TO THE

TOOLS HAND TOOLS
Kitchen Knife
Bolo
Hammer
Cross cut saw
shovel
Screw drivers
Others(specify)