This document provides safety precautions for working with electronic equipment. It outlines expectations to obtain work instructions, consult responsible persons, and interpret data sheets. It then describes how to avoid accidents, including electrical shock, discharging capacitors, electrostatic sensitive devices, fire, proper ventilation, and laser safety. Specific steps are outlined for discharging switch mode power supply capacitors and reducing damage from static electricity. The document emphasizes turning off and unplugging equipment before working on it and taking precautions like wearing protective shoes and using plastic tools.

1. MODULE 1
Safety Precautions When Working with Electronic Equipment

2. EXPECTATIONS
At the end of the lesson, you should be able to:
1. obtain and clarify work instructions based on job order or client
requirements;
2. consult responsible person for effective and proper work
coordination; and
3. obtain and interpret data sheets/application notes based on
manufacturer’s specifications.

3. BRIEF INTRODUCTION
This module covers the knowledge, skills and attitudes required to
test electronic components. It includes competencies in
determining the criteria for testing electronics components,
planning an approach for component testing, testing the
components and
evaluating the testing process

4. STEPS ON HOW TO AVOID ACCIDENTS
1. Electrical Shock
Once you open up a set cover, you’re actually exposing yourself to the threat of electrical
shock.
Rules which should help you to avoid electricity hazards.
a. Always turn off the equipment and unplug it before you begin to work.
b. If you have to run test while the equipment is operating, turn the equipment on, make your
test carefully, and then turn the equipment off again.
c. Wear rubber bottom shoes or sneakers. d. Try to do the work with one hand, while keeping
the other in your pocket that keeps the possible current paths away from your heart.

5. Rules which should help you to avoid electricity hazards.
e. Don’t attempt to do repair work when you are tired or rushed.
f. Always assume that all the parts in the power supply are “HOT”
g. Use only plastic screwdriver for shock protection during service operation.
STEPS ON HOW TO AVOID ACCIDENTS

6. STEPS ON HOW TO AVOID ACCIDENTS
2. DISCHARGING SWITCH MODE POWER SUPPLY(SMPS) CAPACITORS
Most SMPS have a resistor to drain the charge in the main filter capacitor. Capacitors have a
range of about 15µf to 330µf at 400 working voltage. Before you start to work on a power
supply, always turn off the power and discharge the capacitor. You can do this by placing a
resistor across the two legs of the capacitor.

7. STEPS ON HOW TO AVOID ACCIDENTS
DISCHARGING SWITCH MODE POWER SUPPLY(SMPS) CAPACITORS
NOTE/WARNING:
Do not discharge capacitor with screwdriver because:
1. It may melt the tip of the screwdriver.
2. It will damage the capacitor and its terminal.
3. If you are too near to the point of discharge, the heavy spark generated may cause injury
to your eyes.

8. STEPS ON HOW TO AVOID ACCIDENTS
3. ELECTROSTATICALLY SENSITIVE DEVICES (ESD) Integrated circuits (IC) & some field
effect transistors are examples of ESD devices.
Techniques to reduce the incidence of component damage, caused by static electricity.
a. Immediately, before handling any ESD devices, drain the electrostatic charge from your body by touching a
known earth ground.
b. Store ESD devices in a conducive foam pad until installation in circuit.
c. Wear a grounding strap, attached to your wrist.
d. When transporting or storing ESD sensitive devices outside the ESD protected area, the devices should be
in packaging that includes shielding.

9. STEPS ON HOW TO AVOID ACCIDENTS
4. FIRE
Fire safety is the set of practices intended to reduce the destruction caused by fire. Fire safety
measures include those that are intended to prevent ignition of an uncontrolled fire and those
that are used to limit the development and effects of a fire after it starts. Fire extinguishers
need to be readily accessible by employees in the event of a fire. Depending on your facility’s
fire hazards, fire extinguishers with different ratings may be required in different locations

10. STEPS ON HOW TO AVOID ACCIDENTS
5. VENTILATION
In a workplace, ventilation is used to control exposure to airborne contaminants. It is
commonly used to remove contaminants such as fumes, dusts, and vapors, in order to provide
a healthy and safe working environment. Ventilation can be accomplished by natural means
(e.g., opening a window) or mechanical means (e.g., fans or blowers).

11. STEPS ON HOW TO AVOID ACCIDENTS
6. LASER WARNING LABELS
If you are troubleshooting DVD, VCD, laser printer and other laser related products, you will
notice a laser warning label on or near the laser head assemble. Do not stare at the laser
beam at any time. Prolong exposure of laser beam to the eyes may cause eye injury or loss of
sight. Some lasers emit radiation in the form of light. Others emit radiation that is invisible to
the eye, such as ultraviolet or infrared radiation

12. THANK YOU