Fundamentals of Computer. Computer Is a machine w/c manipulates data according to a list of...
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Computer Hardware and Servicing Fundamentals of Computer
Fundamentals of Computer. Computer Is a machine w/c manipulates data according to a list of instructions which makes it an ideal example of a data processing
Computer Is a machine w/c manipulates data according to a list
of instructions which makes it an ideal example of a data
processing system.
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Advantage Searching of information Online business and easy
transaction Instant communication Strong vast amounts of
information's Fast development of technology of all kinds
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Disadvantages Leads exposure of sensitive information to kids
Wastes of time and distraction Greater complexity of life Generates
lots of extra work Some people think that we are deskilled
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OH and S (Occupational Health and safety 1. Observed ESD
(Electro static Discharge) always use anti-static wrist strap. 2.
Document Everything. 3. Switch off Computer. 4. Remove the cables
from the back of the case. 5. Be sure to have a container to keep
the screws. 6. Place all components when remove in anti static bags
or anti static mat.
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7. Make sure you have all the tools, resource, materials,
drivers or software that you need. 8. Do a system back up. 9. Use
common sense.
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ESD The transfer of an electrostatic discharge. Charges of two
bodies. Two objects of different potentials came into direct
contact. Is one of the few things an individual can do to damage or
destroying his/her computer or hardware components. Makes
components no longer work properly.
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Tools for anti static or ESD Anti static Bag for storage of
devices on preventing electrostatic.
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Antistatic Mat A mat on which you can stand while repairing a
computer or adding expansion card. The mat absorbs static
electricity which might otherwise damage electronic components
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ESD Wrist strap A safety device used to channel static
electricity to a proper ground while handling sensitive computer
equipment. (ESD) damage occurs when a release of stored static
electricity travels from something such as a person's body into a
conductor of a different potential, such as a computer being
repaired. The ESD wrist strap safely channels the static
electricity to a proper ground, typically the computer's
chassis.
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ESD Gloves/Conductive Gloves - are made of 13 ga Polyester and
Silver composite fiber. These conductive gloves offer superior
conductivity of 10 4 and has 1 ohms drop from the finger tip to
wrist. They are moisture resistant while offering static free
performance. These gloves are ambidextrous which allows flexibility
and reduces fatigue and are washable
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Prevent ESD 1. Zero Potential make sure you and the computer
must be equally zero. 2. Standing sitting have more generated ES.
3. Cords make sure everything is remove of the back of the computer
(mouse, keyboard, power chord, etc.). 4. Dont wear any clothing
that conducts a lot of electrical charge. Such as wool sweater. 5.
Weather electrical storms 6. Accessories removed all jewelry.
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7. Housekeeping observed proper house keeping.
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Classes of computers Analog is a form of computer that uses
continuous physical Phenomenon such as electrical, mechanical, or
hydraulic quantities to model the problem being solve. Calculator
more in numbers, inter active problem solving but limited.
Mathematical calculation. Embedded is a special purpose computer
system designed to perform one or a few dedicated functions, often
with real time computing constraints.
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Desktop is a personal computer in a form intended for regular
use at a single location, as opposed to a mobile laptop or portable
computer. Laptop is a personal computer designed for mobile use.
PDAs Personal Digital Assistant, a hand held computer. Known as
PALM TOP Computer. SERVER centralized all computer s, also a
computer program that provides service. SUPER-Computer - a computer
that is at a frontline of current processing unit.
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Tablet PC equipped w/touch screen using stylus to input. Is a
laptop-state-shaped mobile. Workstation high-end micro computer
designed for technical or scientific application. Commonly
connected to LAN. Portable Data Entry Terminals use to captured or
record data away from the mainframe computer that they are linked
to card reader, scanners.
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Classification of Devices Input Devices any devices or
peripherals that gives data/signal. Output Devices - any devices or
peripherals that display or execute data/signals. Storage
Devices
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Input devices I. KEYBOARD is the primary device in
inputting.
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Types of Keyboard AT Keyboard - The AT keyboard was a keyboard
with 84 keys introduced with the IBM PC/AT computer. It succeeded
the 83-key PC/XT keyboard and therefore did not have many of the
features seen on modern keyboards such as inverted-T arrow Keys and
dual ctrl and alt keys. It was later replaced with the 101-key
Enhanced key board. It has 5 pin mini-DIN.
PS/2 Personal Computer 2, a common keyboard. Pin 1 (+) keyboard
data Pin 2 Unused Pin 3 Ground Pin 4 Volts Pin 5 Clock Pin 6
Unused
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USB keyboard Pin 1 (+)5vType AType B Pin 2 (-) data Pin 3 (+)
data Pin 4 Ground
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Infrared/IR Keyboard short range exchange of data over infrared
light. Bluetooth Keyboard wireless device to move cursor or
pointer.
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II. Mouse pointing device to move cursor or pointer, serial
mouse. Types 1. Optical 2. TrackBall 3. Mechanical rubber or metal
ball on its sides 4. Optomechanical Gunks use to detect the
motion
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Optical mouse Track ball mouse
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Mechanical mouse
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Opto Mechanical
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III. Images Scanners converts any images into electronic form.
type: - flat bed - hand held IV. Digital Camera stores images
digitally VI. PEN or Stylus electronic gadget by writing or
pointing on a special pad (graphic tablet) or directly on a screen.
VII. Joysticks/Stirring Wheel or Gamepad VIII. Touch Screen
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IX. Touch Pad graphic tablet that translate each position on
the tablet to specific location on the screen. X. Bar code Reader
detects bars and converts into numerical digits. XI. Card Reader
reads information that has been magnetically encoded. (punch card
reader)
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Output Devices I. Monitor peripheral device w/c is capable of
showing a soft copy or video output to the user. Types: 1. CRT
cathode ray tube 2. LCD liquid Crystal Display 3. LCD TV is an LCD
with video graphics array II. Printer peripheral device that
produces a hard copy
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Modern Printer Toner Base Printer printer using xerographic
principle, and its printer medium is compose of fused heat and
pressure. Laser printer and LED printer is a toner base printer Ink
Jet printer variably-sized droplets of liquid or molten material
(INK) into almost any sized page. And it is using a cartridge.
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Advantages of modern printer Quieter in operation Point finer
Smooth details through high point head resolution Many consumer
inkjets w/photographic quality printing are widely available.
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Disadvantages Ink expensive Many intelligent ink cartridges
contain a microchip that communicates the estimated ink level to
the printer. Care must be taken w/inkjet- pointed documents. Has a
very narrow inkjet nozzle are prone to clogging
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III. Speaker converts electrical energy to
mechanical/acoustical energy. IV. LCD projector a video projector
use to display videos or a flat surface. VI. Headphones - are a
pair of small loudspeaker which are designed to be held in place
close to a user's ears. Headphones have wires which allow them to
be connected to a signal source such as an audio amplifier, radio,
CD player, or portable media player. They are also known as
stereophones or, colloquially, cans. The in-ear versions are known
as earphones or earbuds. In the context of telecommunications, the
term headset is used to describe a combination of headphone and
microphone.
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Storage Devices Floppy disk a magnetic storage, invented by IBM
in 1971. ZIP Drive Hard Disc Drive - a magnetic disk (Magnetic
Aluminum Magnesium Alloy) Parts: Disk Platter R/W head move across
the platter in Unison Head actuator mechanism holds the R/W head
and moves the R/W head
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Spindle Motor - spins the platter logic Board contains all the
electronic part Cables and connectors Configuration items (such as
jumpers or switches) Interface of a HDD SATA Serial Advance Tech
Attachment IDE Integrated Drive Electronics ESDI Enhanced Small
Disk Interface SCSI Small Computer System Interface EIDE Enhanced
Integrated Drive electronics