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For details about taking the CompTIA A+ exams, go to the CompTIA Web site (wwwcomptiaorg)
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1: Essentials Review
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Lab Exercise 102: Disassembling and Reassembling the System Unit and Identifying Internal Components and Connections
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You re now going to walk through the complete disassembly of the system unit Try to do this in an orderly sequence, but, depending on the con guration of the computer you are disassembling, you may have to perform one or two of the steps out of sequence For example, you may have to remove a CD or DVD media drive before you can gain access to remove the power supply
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When you re on the job, you ll encounter different models of personal computers manufactured by different companies Along with learning the slightly different methods of component removal and installation, you should be able to identify the major internal parts of the PC system, regardless of the manufacturer This lab exercise will help you practice doing that Ready, Set, GO!
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In this lab exercise, you will locate, remove, and describe the various internal components and connectors of a standard PC system At the end of this lab, you ll be able to Remove all major components of a PC Recognize all major components inside a PC Name the function of each component De ne the relationship of internal components to external connections
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Lab Materials and Setup
The materials you need for this lab are A lab partner, if possible At least one PC that isn t vital to your (or anyone else s) home or business, not necessarily in working order but preferably less than a few years old An anti-static wrist strap An anti-static mat (optional) Twelve anti-static bags of various sizes A simple technician s toolkit
Lab Exercise 102: Disassembling and Reassembling the System Unit and Identifying Internal Components
A plastic cup or box to organize the various screws, nuts, and bolts that you ll remove A clean, well-lighted workspace of about 3 x 4 (a kitchen table with some newspaper spread about usually makes a fairly decent ad-hoc lab bench) A notepad on which to take notes and make sketches of the computer and components A digital camera to record the placement, con guration, connections, and connectors associated with the components you ll be removing from the system unit (optional)
Getting Down to Business
Shut off the power to your system and unplug the power cord from your PC and from the wall socket before doing the following exercise
Step 1 Disconnect all the external cables (monitor, keyboard, mouse, printer, etc) from the PC you are going to use, and place the PC on a at, stable surface (preferably on an anti-static mat) where you can sit or stand comfortably to inspect the insides Step 2 Use proper anti-static procedures while opening the case and during this entire exercise Using whichever method applies to your case (thumbscrews, Phillips-head screws, locking tabs), remove the cover of your system unit and then lie the system down so that the open side faces the ceiling
Review 2 of Mike Meyers A+ Guide to Managing and Troubleshooting PCs, Vol 1: Essentials to con rm your understanding of proper electrostatic discharge (ESD) procedures and how to open a PC system case
Look inside your system case What do you see To begin with, you ll see lots of cables and wires Some appear to be single-colored wires, while others seem to be multiple gray-colored wires in the shape of wide ribbons Most colored wires originate at the power supply and end at the various devices to supply the needed direct current (DC) power to run the PC The wide ribbon cables attach various components and are used to transfer data These are sometimes referred to as logic cables or data cables See if you can locate in your system case the major components labeled in Figure 1-1 You may have to move some of the fan shrouds, wires, and cables in order to nd them especially components on the motherboard but remember your anti-static procedures and be gentle Sometimes the slightest bump is enough to unseat a connection