PC Maintenance: PC Maintenance: Preparing for A+ Preparing for A+

CertificationCertificationChapter 2: Safety and Preventive Chapter 2: Safety and Preventive

MaintenanceMaintenance

Chapter 2 ObjectivesChapter 2 Objectives

Identify potential safety hazards when Identify potential safety hazards when working on PCsworking on PCs

Identify fire extinguisher typesIdentify fire extinguisher types Understand electrostatic dischargeUnderstand electrostatic discharge Understand electromagnetic interferenceUnderstand electromagnetic interference Be able to properly and safely clean a PCBe able to properly and safely clean a PC Know how to dispose of hazardous Know how to dispose of hazardous

materialsmaterials

Protect Yourself from Electric Protect Yourself from Electric ShockShock

Do not Do not disassemble a disassemble a power supplypower supply

Replace entire Replace entire power supply if power supply if defectivedefective

Protect Yourself from Electric Protect Yourself from Electric ShockShock

Do not Do not disassemble disassemble monitormonitor

Replace entire Replace entire monitor if monitor if defectivedefective

Have monitor Have monitor serviced by serviced by specially trained specially trained techniciantechnician

Watch out for protruding wires

Don’t weardangling jewelry

Shirt sleeves canget caught on sharp

edges

Protect Yourself Protect Yourself from Other Hazardsfrom Other Hazards

Inner edgesof cases

may be sharp

Avoid jewelry ofconductive metals

Fire Extinguisher TypesFire Extinguisher Types

Read the label!

Wood and paper

Flammable liquid such as gasoline

Electrical fires

Electrostatic DischargeElectrostatic Discharge

A.k.a. static electricityA.k.a. static electricity Unequal voltage potential between two Unequal voltage potential between two

objectsobjects A very small amount can ruin electronicsA very small amount can ruin electronics Humans feel only large amountsHumans feel only large amounts

Anti-Static Wrist StrapAnti-Static Wrist Strap

Clips to ground plug or

metal frame of PC case

Wraps around your wrist

Equalize the PotentialEqualize the Potential

Touch metal frame Touch metal frame of PC before of PC before touching circuit touching circuit board or chipboard or chip

Avoiding ESD in EnvironmentAvoiding ESD in Environment

Work in a room with humidity between Work in a room with humidity between 50% and 80%50% and 80%

Wear natural fibers, not syntheticWear natural fibers, not synthetic Wear rubber-soled shoes when possibleWear rubber-soled shoes when possible Stand on a ESD-dispersing floor mat if Stand on a ESD-dispersing floor mat if

availableavailable

Electromagnetic Interference Electromagnetic Interference (EMI)(EMI)

Electricity passing through cable Electricity passing through cable generates a magnetic field.generates a magnetic field.

Magnetic field can interfere with data Magnetic field can interfere with data passing through nearby cables, causing passing through nearby cables, causing data corruptiondata corruption

Preventing EMIPreventing EMI

Use EMI-shielded cables in areas where it Use EMI-shielded cables in areas where it is an issueis an issue

Use short cables when possibleUse short cables when possible Move cables so they don’t run togetherMove cables so they don’t run together Relocate the PC to a different locationRelocate the PC to a different location

Other PC HazardsOther PC Hazards

Temperature:Temperature: PCs prefer cool areas, but PCs prefer cool areas, but keep above freezingkeep above freezing

Trauma:Trauma: Don’t place PCs where they can Don’t place PCs where they can be kicked or knocked offbe kicked or knocked off

Magnets:Magnets: Magnets can ruin data stored Magnets can ruin data stored on a disk. Magnets may be found in on a disk. Magnets may be found in speakers and in some older phones, as speakers and in some older phones, as well as magnetic toolswell as magnetic tools

Cleaning Supplies for a PCCleaning Supplies for a PC

Spray cleaner designed for external Spray cleaner designed for external computer partscomputer parts

Vacuum designed for electronicsVacuum designed for electronics Denatured alcoholDenatured alcohol Cotton swabsCotton swabs Clean dry lint-free clothsClean dry lint-free cloths Can of compressed airCan of compressed air

Cleaning a MonitorCleaning a Monitor

Do not use Do not use regular glass regular glass cleanercleaner

Use glass Use glass cleaner designed cleaner designed for monitorsfor monitors

Do not spray Do not spray while monitor is while monitor is turned onturned on

Cleaning a KeyboardCleaning a Keyboard

Turn off the PC before cleaning keyboardTurn off the PC before cleaning keyboard Turn keyboard upside-down and shake Turn keyboard upside-down and shake

gently to remove loose particlesgently to remove loose particles Get between the cracks with a cotton Get between the cracks with a cotton

swab or a bit of folded paper towelswab or a bit of folded paper towel Clean keys with a cloth dampened with Clean keys with a cloth dampened with

spray cleaner designed for PCsspray cleaner designed for PCs

Cleaning a MouseCleaning a Mouse

1.1. Remove panel Remove panel on the bottomon the bottom

2.2. Remove the ballRemove the ball

3.3. Clean inside with Clean inside with alcohol and alcohol and cotton swabcotton swab

4.4. Clean ball with Clean ball with soap and water soap and water

Cleaning Circuit BoardsCleaning Circuit Boards

Use canned air to blow dust awayUse canned air to blow dust away Do not use waterDo not use water Use alcohol if liquid is necessaryUse alcohol if liquid is necessary

Cleaning an Inkjet PrinterCleaning an Inkjet Printer

Clean the outside with a cloth dampened Clean the outside with a cloth dampened with cleaner for PCswith cleaner for PCs

Run the Run the printer’s printer’s self-self-cleaning cleaning utility to utility to clean print clean print headsheads

Cleaning a Laser PrinterCleaning a Laser Printer

Clean corona wires with alcohol and Clean corona wires with alcohol and cotton swabscotton swabs

Clean outside with cloth dampened with Clean outside with cloth dampened with PC cleanerPC cleaner

Vacuum loose toner with special vacuum Vacuum loose toner with special vacuum for electronicsfor electronics

Cleaning Pad on Laser PrinterCleaning Pad on Laser Printer

Replace felt pad Replace felt pad when replacing when replacing toner if your toner if your model uses onemodel uses one

Replacement Replacement pad will come pad will come with toner with toner cartridge if cartridge if neededneeded

Disposal of Hazardous MaterialsDisposal of Hazardous Materials

Make use of your local Make use of your local hazardous waste disposal hazardous waste disposal facilityfacility Cleaning chemicalsCleaning chemicals Toner cartridgesToner cartridges MonitorsMonitors Circuit boardsCircuit boards BatteriesBatteries

Material Safety Data Sheet Material Safety Data Sheet (MSDS)(MSDS)

Guidelines that dictate proper disposal of Guidelines that dictate proper disposal of an iteman item

Available on the Internet, or through EPAAvailable on the Internet, or through EPA