basic pc troubleshooting part 2

8/8/2019 Basic PC Troubleshooting Part 2

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Technical DetailsTechnical Details

BASIC PC TROUBLESHOOTINGBASIC PC TROUBLESHOOTINGBASIC PC TROUBLESHOOTING

MotherboardMotherboard4. Take note of the chipset model when

you purchase new motherboard.

5. New motherboard are jumperless.

6. Some motherboard have onboard

WiFi tx/rx.

7. Get to know the BIOS


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Motherboard LayoutMotherboard Layout


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Motherboard Layout (rear panel)Motherboard Layout (rear panel)


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MemoryMemory1. When buying RAM take note of the

size and the speed.

2. Extended memory is all memory afterthe first 1MB of RAM.

3. Memory latency is the amount of time

it take to locate the data stored.

4. DDR have 240 pins, the diff. between

DDR2 and DDR3 is the speed


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Memory installationMemory installation


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Memory installationMemory installation


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HardiskHardisk1. Hardisk is organized in terms of

tracks, sectors, and cylinders. 1

sector is equal to 512 bytes

2. Byte is the unit of measurement to

measure the capacity to store data

3. 1K = 1,024 bytes1M = 1,048,576 bytes

4. Disk Platter where data is stored is

made of aluminum and glass ceramic


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HardiskHardisk5. The speed in reading data depends

in revolution per minute of the spindle

motor.

6. It uses Read / Write head that are

constructed with a magnetic core

7. Recording of information to thehardisk uses Magnetic Flux

8. Connection to the motherboard uses

IDE or SATA. Either master or slave


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Hardisk PartsHardisk Parts


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Hardisk PartsHardisk Parts IDE CableIDE Cable


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Optical DriveOptical Drive1. CD capacity is 650 MB DVD

capacity is 4GB.

2. Optical drive uses LASER to storeand retrieve information.

3. The interface of optical drive is the

same interface cable used byhardisk.

4. It uses single spiral track to store

information.


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Optical DriveOptical Drive


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Video CardVideo Card1. Uses AGP or PCI express in the

motherboard.

2. Uses SVGA that supports 16 millioncolors. Screen resoultion is the size

of the screen 1024 x 768

3. New video card have GB videomemory

4. Refresh rate is the number of flicker


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Video CardVideo Card


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Power SupplyPower Supply1. Power supply converts AC to DC

2. Capacity is measured in terms of

Watts.

3. Voltage needed by motherboard is

3.3V, 5V, and 12V.

4. Power supply does not protect the

circuitry from voltage fluctuation.


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Power SupplyPower Supply


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Magnetic Disks

p. 357 Fig. 7-5 Next

What are tracksand sectors?

Track

is narrow

recording band

that forms full

circle on disk

Sector

stores upto

512bytes

of data

Formattingprepares disk for use and marks bad sectors as unusable


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Magnetic Disks

What is a cylinder?

p. 362 Fig. 7-13 Next

Vertical sectionof trackthrough allplatters

Singlemovement ofread/writehead armsaccesses all

plattersin cylinder

platter

read/writehead

platter

sides

cylinder

tracksector


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Magnetic Disks

How do you compute a disks storagecapacity?

p. 359 Next

Multiply number of sides, number of tracks, numberof sectors per track, and number of bytes per sector

For high-density disk: 2 sides v 80 tracks v 18 sectors pertrack v 512 bytes per sector = 1,474,560 bytes

Characteristics of a

3.5-inch High-Density

Floppy Disk

Capacity: 1.44 MB

Sides: 2

Tracks: 80

Sectors per track: 18

Bytes per sector: 512

Sectors per disk: 2880


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Magnetic Disks What is a head crash?

p. 362 Fig. 7-14 Next

clearance

read/write head

platter

hair

dustsmoke

Spinning creates cushion of air that floats read/writehead above platter

Occurs when read/write head touches platter surface

A smoke particle, dust particle, or human hair

could render drive unusable

Clearance between head and platter is approximatelytwo-millionths of an inch

basic pc troubleshooting part 2

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