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9/11/14 Objectives:
To disassemble and assemble a desktop
 To identify specific components within a
computer case
Parts is Parts
A brief overview of the
computer and its components
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
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
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
Cooling Fan
RAM – Random Access Memory
Short-term storage for the PC while it processes
 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.
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
Interacts with the
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