PC Support & RepairChapter 2Safe Lab Procedures & Tool Use

Objectives• After completing this chapter, you will meet these objectives:▫Explain the purpose of safe working conditions and

procedures. ▫ Identify tools and software used with personal computer

components and their purposes. ▫ Implement proper tool use.▫ Identify safety procedures and potential hazards for users and

technicians. ▫ Identify safety procedures to protect equipment from damage

and data from loss. ▫ Identify safety procedures to protect the environment from

contamination.

Safe Workplace•Prevents personal injury•Keeps equipment safe

General Safety•Keep fire

extinguisher & first aid kit handy

•Watch cable tripping hazard▫Where would

you place cables to prevent this?

Electrical Safety•HIGH VOLTAGE▫Power supplies▫Monitors

Should be replaced, not repaired DO NOT wear antistatic wrist strap if you repair these

•Printer parts can become HOT▫Let cool down

•Don’t mix AC adapters for laptops▫Might have different power requirements

Fire Safety•TURN OFF PC & UNPLUG b4 u do work▫Never fight a fire that is out of control or not

contained. ▫Always have a planned fire escape route before

beginning any work. ▫Get out of the building quickly. ▫Contact emergency services for help. ▫Be sure to locate and read the instructions on the fire

extinguishers in your workplace before you have to use them.

ESD•Static electricity▫Buildup of charge on surface▫Buildup can JUMP to a component

Electrostatic discharge•Anything you do can cause static▫3000v for you to feel it▫Walk across carpet & touch someone

10,000v!!!• LESS THAN 30V CAN DAMAGE PC COMPONENTS

Protect Against ESD•Keep components in antistatic

•Use grounded mats on workbenches

•Use grounded floor mats in work areas

•Use antistatic wrist straps when working on computers

EMI & RFI•EMI▫Outside electrical signals interfere

with media (wire)▫Distorts the normal signal▫Ex: Cell phone rings next to PC▫Power lines, motors, lightning storms

•RFI▫Cordless phone or microwave oven

messes up Wi-Fi

Power Issues

Power Protection Devices• Surge Suppressor▫Diverts extra power to the ground

•UPS▫Battery recharging▫Allows shutdown time when no power▫NO PRINTER IN UPS

• SPS (Standby Power Supply)▫Backup battery supplies power to shut down▫Too much switching time

Hazardous Materials•Heavy metals such as cadmium, lead, or mercury•Follow regulations for recycle or removal

• Look up your town’s policy

MSDS•Document summarizes materials, hazards, safety

procedures for spills, safety requirements

•Sample MSDS

Disposal• Batteries▫ Lead, cadmium, lithium, alkaline manganese, and mercury

DO NOT DECAY▫Recycle Li-ion, Ni-Cd, Ni-Mh, and lead-acid

•Monitors▫Glass, metal, plastic, lead▫Recycle

• Toner & Ink▫Recycle or refill

• Cleaning chemicals or Cans of air▫Not down sink/drain

Review•What items are hazardous & need to be disposed of

specially?▫Batteries, monitors, toner

•Before you work on a PC, you should…▫turn off & unplug it

•To reduce a chance if ESD, you should use mats on two places. Where?▫Desk & floor

Review•Where should you store parts, like hard drives & NICs

when not in a computer?▫Antistatic bag

•What can cause EMI?▫Motors

• T or F. Before you work on a monitor, you should clip the antistatic strap to the desk.▫False

•What document describes chemical ingredients & spill cleanup process?▫MSDS

Hardware Tools•Keep these tools in your handy-dandy toolkit▫ESD tools ▫Hand tools ▫Cleaning tools ▫Diagnostic tools

ESD Tools• Antistatic wrist strap▫Protects when grounded to a

computer chassis

• Antistatic mat▫Protects by preventing static

electricity from accumulating on the hardware or on the technician

Identify Hand Tools•Flat head screwdriver•Phillips head screwdriver•Torx screwdriver•Hex driver•Needle-nose pliers•Wire cutters•Tweezers•Part retriever•Flashlight

Cleaning Tools•Soft cloth•Compressed air•Cable ties•Parts organizer

Diagnostic Tools•Multimeter

• Loopback adapter

Disk Management Tools• Fdisk or Disk Management – Creates and deletes

partitions on HD • Format – Erases all• Scandisk or Chkdsk – Checks the integrity of files and

folders on a hard drive by scanning the file system. Also checks the disk surface for physical errors

• Defrag – Optimizes space on HD to allow faster access to data

• Disk Cleanup – Clears space on a hard drive• System File Checker (SFC) – Scans OS critical files and

replaces any files that are corrupted

Disk Management Tools

Protection Software•Windows XP Security Center – Checks the status of

essential security settings. Continuously checks to make sure that the software firewall and antivirus programs are running. Ensures that automatic updates are set to download and install automatically.

• Antivirus program – Protects against virus attacks. • Spyware remover – Protects against software that sends

information about web surfing habits to an attacker. • Firewall program – Runs continuously to protect against

unauthorized communications to and from your computer.

Organizational Tools•Keep repairs documented!▫Keep notes▫Journal all activities▫Repair log

•Use the Internet for help

Review•What process moves parts of files closer together on a

hard drive?▫Defrag

•What process will clean up temporary files you got from going on the Internet?▫Disk cleanup

• Define a brownout.▫Reduced voltage for a period of time

•What tool can measure voltage or check a cable’s continuity?▫Multimeter

Review•Which screwdriver has a straight end?▫Flathead

•Which XP CLI utility scans for corrupted OS files & replaces them?▫System file checker

•What is best at removing dust in a PC?▫Compressed air

Using the Wrist Strap•Wrap around wrist•Clip to unpainted metal

case

•DO NOT wear one if repairing a power supply or monitor

Using the Mat•DO NOT work on PC on carpeted area

• Lay mat on desk•Clip mat to the case

Using Hand Tools•What’s a stripped screw•Some are magnetized▫DO NOT use these around computers▫How can you tell if one is?

Cleaning

Lab•2.3.4•Disassemble computer

Review

PC Support & RepairChapter 2Safe Lab Procedures & Tool Use