PC Technician Safety Measures Personal safety is your top priority when working with computer components Exercise great care when working with electricity Before handling a system component make sure that it is powered off and that the main power cord is unplugged from the wall socket ID: 210943
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Slide1
Module 2
PC TechnicianSlide2
Safety Measures
Personal
safety
is
your top priority when working with computer components.
Exercise great care when working with electricity.
Before handling a system component, make sure that it is powered off and that the main power cord is unplugged from the wall socket.
DO NOT open
the power supply which houses a capacitor (stores a large charge of electricity).
Anti-static
wrist straps not only protect components, but can reduce the chance of accidental electrical shock. Properly ground yourself before working with components.
Do
not
use a grounding strap when working with monitors, power supplies, laptop LCD panels, or other high-voltage components
.Slide3
Safety Measures
Maintain and periodically review the Material Safety Data Sheet (MSDS). The MSDS describes safe handling procedures for dangerous materials.
Keep in mind the following specific issues that can also be hazardous:
Do NOT service CRT monitors. They can store 30,000 volts of electricity, even when unplugged. Be sure to discharge capacitors or turn the equipment over to qualified personnel for servicing.
Components such as the CPU heat sink and fan, the printing head of a dot matrix printer, or components inside a laser printer can be hot.
Some studies suggest that laser printers emit tiny particles which could be dangerous when inhaled. As a precaution, do not locate laser printers immediately next to desks, and keep the area ventilated.
Replace faulty power supplies instead of trying to repair them.Slide4
ESD
Static electricity is the accumulation of an electric charge (produced by friction) on a non-grounded object. The static charge
can
jump when it contacts the surface of any grounded object. This electric discharge is known as
electrostatic discharge
(ESD). ESD can be very destructive to a computer.
ESD
can cause immediate failure of components, or could gradually degrade components, causing only intermittent problems
.Slide5
ESD
Implement the following measures to protect against ESD.
Keep the relative humidity between 40-70% and temperature between 72-77 degrees. Avoid dry air in the computer repair location.
Use antistatic mats under the PC and on the floor.
Discharge yourself before touching any computer component.
When touching anything inside the computer, wear an antistatic wrist strap that is attached with an alligator clip to the metal PC chassis.
Ground both yourself and the computer to the same ground. This provides a single path for the flow of electrical potential.
Never touch the metal connectors on a circuit board.
Store sensitive components in static-shielded bags (also called anti-static bags; they are usually tinted gray)
If a wrist strap is unavailable, keep your body in constant contact with the metal frame when working inside the computer.
Note:
Unplug the system before working on internal components. Do not rely on the power cord for an electrical ground. Slide6
Environmental Facts
Component or Material
Disposal Method
Alkaline batteries
Recycle if possible, otherwise dispose of in the regular trash.
Notebook battery packs
Button batteries
Considered hazardous waste. Return to manufacturer, recycle, or contact local authorities for disposal procedures.
Monitor
Contact local authorities. CRTs contain many toxic and caustic substances that are illegal to incinerate and must be encased in cement before being buried. Also, discharge before disposal (CRTs can contain high voltages.).
Power supply
Contact local authorities. Discharge before disposal (contains high voltages).
PC system
Contact local authorities. Recycle if possible: the typical PC contains $5 to $25 worth of precious metals.
Laser printer toner
Return to manufacturer for recycling (to clean up spills, use a toner vacuum or a scoop and a damp cloth; never use a regular vacuum).
Ink-jet printer cartridges
Consult with local authorities for recycling possibilities.
Cleaning solutions and solvents
Consult the MSDS, a licensed disposal organization, or local authorities for handling and authorized disposal procedures.Slide7
PC Maintenance
Facts
Consideration
Description
Heating, ventilation, and air conditioning (HVAC)
Keep temperature between 70 and 74 degrees to prevent components from overheating. Keep humidity between 40 and 70 percent to prevent
ESD.
For
areas with heavy smoke or dust, add filters to air intake systems to filter out airborne particulates
.
Interference
Electromagnetic Interference (EMI)
Radio Frequency Interference (RFI
)
Magnetic fields
Magnetic fields located close to a computer can cause undesired effects or even data loss
. Getting
a magnet too close to these components could erase
data.
Magnets
near a CRT monitor can distort the images on the
screen.CRT
monitors, speakers, motors, and generators contain magnets (keep sensitive components away from these devices
).
Solid
state storage devices (such as RAM or flash drives) are not affected by magnetic fields.Slide8
Power Protection Facts
Problem
Description
Surge
Over voltage that lasts seconds
Spike
Over voltage that lasts milliseconds
Sag
Under voltage that lasts milliseconds
Brownout
Under voltage that lasts seconds (lights dim)
Blackout
Complete power failureSlide9
Troubleshooting Process
Facts
Identify the problem. Resist the urge to start fixing things at this point.
Before making changes to the system, back up user and system data.
Identify possible causes and identify a theory of a probable cause.
Test your theory to verify the cause of the problem.
Create an action plan, addressing the most likely problem.
Test the result.
Demonstrate the result.
Document the solution and processSlide10
Windows Utilities
Facts
Control
Panel
Task Manager
Microsoft Management Console (MMC)
Computer Management
Event Viewer
Services
Performance Monitor
Reliability Monitor
System Information (Msinfo32)
System Configuration Utility (
Msconfig
)
Command Prompt
Regedit