LESSON 4 & 5 HSS hardware system and servicing

LESSON 4 : PROPER USE OF ESD TOOLS
HSS

PROPER USE OF ANTISTATIC WRIST STRAP
Connect the cable to the metal chassis of
the computer.
Wrap the strap around your wrist.
The connection will keep your body at
the same voltage (potential) as the
computer.
Attach the wire on the same side of the
equipment as the arm wearing the
antistatic wrist strap to keep the wire out
of the way while you are working.

CAUTION: NEVER WEAR AN ANTISTATIC WRIST STRAP IF YOU ARE REPAIRING A MONITOR OR
CRT.
Proper Use of Antistatic Mat
Lay the computer on the mat.
Connect the computer to the mat with
the cable.
Connect the mat to a reliable electrical
ground with its cable.
Now, you and the computer are at
ground potential.

PROPER USE OF HAND TOOLS
Use the proper type and size of screwdriver by matching it to the screw.
Do not over tighten screws because the threads may become stripped.
CAUTION: If excessive force is needed to remove or add a component,
something may be wrong.
CAUTION: Magnetized tools should not be used around electronic devices.
CAUTION: Pencils should not be used inside the computer because the pencil
lead can act as a conductor and may damage the computer components.

PROPER USE OF CLEANING MATERIALS
To clean computers and accessories:
 Use mild cleaning solution and lint-free cloth to clean
computer cases, outside of monitor, LCD screen, CRT
screen and mouse.
 Use compressed air to clean heat sinks.
 Use Isopropyl alcohol and lint-free swabs to clean
RAM.
 Use hand-held vacuum cleaner with a brush
attachment to clean a keyboard.
CAUTION: Before cleaning any device, turn it off and unplug the device from the power
source.

LESSON5: OCCUPATIONAL HEALTH AND SAFETY
PROCEDURES

Occupational safety and health (OSH) is a planned system of working to prevent
illness and injury where you work by recognizing and identifying hazards and risks.
Health and safety procedure is the responsibility of all persons in the computer and
technology industries. You must identify the hazards where you are working and
decide how dangerous they are. Eliminate the hazard or modify the risk that it
presents.There are three steps to manage health and safety at work: (1.) Spot the
Hazard (Hazard Identification), (2.) Assess the Risk (Risk Assessment) and (3.) Make
the Changes (Risk Control).You can use these three Think Safe steps to help prevent
accidents at work

THE THINK SAFE STEPS
1. Spot the Hazard
A hazard is anything that could hurt you or someone else.
Examples of workplace hazards include:
frayed electrical cords (could result in electrical shock)
boxes stacked precariously (they could fall on someone)
noisy machinery (could result in damage to your hearing)
During working hours, you must remain alert to anything that may be dangerous. If
you see, hear or smell anything odd, take note. If you think it could be a hazard, tell
someone.

2. Assess the Risk
Assessing the risk means working out how likely it is that a hazard will harm someone and how
serious the harm could be.
Whenever you spot a hazard, assess the risk by asking yourself two questions:
How likely is it that the hazard could harm me or someone else?
How badly could I or someone else be harmed?
Always tell someone (your employer, your supervisor or your health and safety representative)
about hazards you can't fix yourself, especially if the hazard could cause serious harm to anyone.
For example, (1) Ask your supervisor for instructions and training before using equipment, (2)
Ask for help moving or lifting heavy objects, and (3) Tell your supervisor if you think a work
practice could be dangerous.
If you are not sure of the safest way to do something during work experience, always
ask your supervisor.

3. Make the Changes
It is your employer's responsibility to fix hazards. Sometimes you may be able to fix
simple hazards yourself, as long as you don't put yourself or others at risk. For
example, you can pick up things from the floor and put them away to eliminate a trip
hazard.

COMMON HAZARDS ENCOUNTERED BY COMPUTER TECHNICIANS AND
USERS
A hazard is a situation in the workplace that has the potential to harm the health and
safety of people or to damage plant and equipment.The situation could involve a
task, chemical or equipment used. Hazard management is a continuous process that
can be used to improve the health and safety of all workplaces.

PHYSICAL HAZARDS
One of the most common physical hazards involving computer technicians is cables running
across the floor. If someone trips, falls, and hurts himself because of a cable you ran across
the floor, someone (you, your employer, or your customer) has a serious legal negligence
problem. If you need to temporarily run a cable across the floor, place a Danger sign similar
to those "wet floor" signs used by cleaning services.
For cables that are temporary but will need to run across the floor for a longer period of
time, use "gaffers tape". Gaffers tape is a heavy tape with strong adhesive to stick to the
floor. For long term cable routing there is a wide variety of cable organizing devices like
cable ties, cable wraps, and cable raceways which can be used to run cable safely along the
wall or ceiling.
Other common physical hazards include leaving tools on top of ladders and placing
electronic equipment in precarious positions or on support that is not sturdy enough or not
designed for holding electronic equipment.

MECHANICAL HAZARDS
When working on electronic equipment, ask yourself "Is there any way this
equipment could hurt me?”You might stick your hand in a printer and suddenly the
paper feed arm moves, feeding not only paper through the printer, but a piece of
your finger too.
You might move your hand past a computer chassis and lose a chunk of flesh
because it is razor sharp.When working on electronic equipment always be alert to
any possibility of being hurt by moving parts, hot components, or sharp edges.

CHEMICAL HAZARDS
There is a wide array of chemicals used with electronic equipment.There are
display cleaning chemicals, keyboard cleaning chemicals, compressed gas dirt and
dust removers, and many cleaning solvents. Some of these chemicals can be harmful
if accidentally swallowed, get on bare skin, or get in eyes. Before using any
chemicals for electronic equipment always read the warnings and instructions on
the label.
Also be very careful when dealing with inkjet printer cartridges, or laser printer
toner cartridges. Ink and toner can stain skin, clothing and carpet.

ELECTRIC SHOCK HAZARD
Inside computers and electronic equipment, there is a
range of voltages from 3.3 volts to 25 volts, most of which
are harmless. But at the power supply, you will find line
voltage, which is a lethal 220 volts.
The workplace should have safety guidelines to follow
to:
Protect people from injury
Protect equipment from damage
Protect the environment from contamination

SAFETY PRECAUTIONS WHEN WORKING:
Always ground or discharge yourself before touching any part of the computer.
Do not work alone so that there is someone who can take care of you in case of accident or
emergency.
Be careful with the tools that may cause short circuit.
Always full the cable connector on the handle and not hold on the cable itself.
Use only rubber shoes when standing on the ground or in a concrete floor.
Make sure that the pins are properly aligned when connecting a cable connector.
Always power off and unplug the computer before working on it.
Take away any liquid such as mineral water or soft drinks near your working area or near computers.
Contingency measures during workplace accidents, fire, and other emergencies are recognized.
Personal protective equipment is correctly used in accordance with organization procedures and
practice.

Hazard/risks in the workplace and their corresponding indicators are identified to
minimize or eliminate risk to co workers, workplace, and environment.
‐
Take necessary precautions to protect the component of the computer from
damaged caused by Electrostatic Discharge (ESD).
Hold the components by edges and do not touch the IC’s.
Read and follow instructions on the manual carefully.
Do not use excessive force if things do not quite slip into place.

FIRE SAFETY GUIDELINES
Know the location of fire extinguishers, how to use them and which to use for
electrical fires and for combustible fires.
Find an escape route in case a fire gets out of control.
Know how to contact emergency services quickly
Keep the workspace clean.
Keep most solvents in a separate area.

CONNECTING PERIPHERALS OF A
PERSONAL COMPUTER
When attaching hardware and peripherals of the computer, ensure that they
are connected to the correct locations or ports. For example, some mouse and
keyboard cables use the same type of PS/2 connector. So, you must know first the
different ports that can be found in the back panel of the computer.
Keep in mind:
1.When attaching cables, never force a connection.
2.Plug in the power cable after you have connected all other cables.

STEPS IN CONNECTING EXTERNAL
HARDWARE OF A PC
 Step 1. Attach the monitor cable to the video port.
 Step 2. Secure the cable by tightening the screws on the connector.

Step 3. Plug the keyboard cable into the
PS/2 keyboard port.
Step 4. Plug the mouse cable into the PS/2 mouse
port.

STEP 5. PLUG THE USB CABLE INTO A USB PORT.

STEP 6. PLUG THE NETWORK CABLE INTO THE
NETWORK PORT.

STEP 7. PLUG THE POWER CABLE INTO THE
POWER SUPPLY.

AFTER CONNECTING ALL THE CABLES INTO THEIR PROPER PLACES,THE PICTURE IN THE NEXT PAGE SHOULD BE
THE APPEARANCE OF THE BACK PANEL OF YOUR PC.

LESSON 4 & 5 HSS hardware system and servicing

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LESSON 4 & 5 HSS hardware system and servicing