9/11/14 objectives:
Post on 03-Jan-2016
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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
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