9/11/14 Objectives:

To disassemble and assemble a desktop computer.

To identify specific components within a computer case

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Parts is Parts

A brief overview of the computer and its components

The OUTSIDE/FRONT

Power button – no comment Floppy Drive – 3.5 (used to be the only

way to transfer files between PC’s). CD-ROM drives- Accepts/reads/copies Power and Hard disk light – no comment

The OUTSIDE/BACK

Fan vent – draws in air and cools components Power cord connector – three prong Voltage switch – 115V or 200V if you are living in

Europe (Big Ben, Parliament) Power supply – what we call the above three Removable panel – normally for another fan

PORTS-Built-ins and Expansions

Keyboard port- AT vs. ATX system determines the size of the plug. ATX = PS/2 port.

Mouse port – commonly PS/2 USB ports – Universal Serial Bus cables. Serial ports – 9-pin male D-sub connectors. Archaic! Parallel port – 25-pin female D-sub connector. Mostly

used for printers Sound connectors – Some built in some Exp. Joystick connector – 15 pin female D-sub Network – RJ-45 connector

And now we take the cover off!

Prepare yourself for a little dust – feel free to use the air compressor to clean it.

Take an iPad picture of the inside

INSIDE – The MOTHERBOARD

Sometimes called main board, system board, and planar board Power supply connector –ATX uses single connector, AT has two

with six pins. Lets unhook these from the components. Built-in ports – ATX vs. AT CPU – That thing got a HEMI!! Does the math calculations (millions

per second) Battery – constant power Expansion Slots – AGP is brown or gray. PCI’s are white, ISA slots

are black RAM – (Random Access Memory) – mini curcuits Drive connectors – Ribbon cables run from the drives to the

motherboard, and connect into a set of pins. Lets take those off right now

Central Processing Unit

PGA (pin grid array) and (SEC) Single Edge Contact. The type you need depends on the type of motherboard you have

PGA – Flat on top and many pins on the bottom SEC – Mounted on a circuit board and then the

circuit board is encased in a plastic cartridge. Cooling device – fan or heat sinks

PGA

SEC

Cooling Fan

RAM – Random Access Memory

Short-term storage for the PC while it processes data Keeps track of what programs/files are open What appears on screen

Very fast but volatile Looks like a small rectangular circuit board

about 5 inches. DIMM or SIMM

DRIVES

CD-ROM, Floppy, hard disks are all nonvolatile storage.

All have two connectors on the back, one for power/one for data

Expansion Boards

Modems, network interface cards, sound cards, and video cards.

Interacts with the motherboard according to the conventions of the type of slot into which it plugs. (called an expansion bus)

Power Supply

Computers require 3V to 12V Direct Current. Takes in electricity from wall, converts it, and

sends appropriate voltages to each device attached to it.

Each different colored wire supplies a different voltage or performs a unique monitoring or management task. (Ex. Red wires supply +5v, and all black wires are for grounding purposes. Other voltages include +12v, -12v, -5v, and +3.3v