SHRI RAMSWAROOP MEMORIAL UNIVERSITY

Department of Electronics & Communication Engineering

Experiment No.2

Objective: Dismantling and assembling of PC.

10.1 EquipmentsRequired:
1. Non-Consumable A. Computer desktop
B. Screwdrivers
C. Multimeter
2. Consumable None

10.2 Basic Principle/Theory involved:A computer device is made up of various elements

which help in its effective functioning and processing. There are five basic components of the
computer which help in making this processing of data easier and convenient. Components of a
computer system are the primary elements which make the functioning of an electronic device
smooth and faster. There are five basic components which include:
1. Input Unit
2. Output Unit
3. Memory Unit
4. Control Unit
5. Arithmetical and Logical Unit

Fig 10.1: Parts of Computer

 Fig 10.2: Parts of CPU

10.3 Procedure:

10.3.1 Disassembling the computer system

system:

Step 1. Detach the Power Cable

Cable: The disassembling of the computer system starts with
externally connected device detachment. Make sure the computer system is turned off, if
not then successfully shut down the system and then start detaching the external devices
from the computer system. It includes removing the power cable from electricity
switchboard,
rd, then remove the cable from SMPS (switch mode power supply) from the
back of the CPU Cabinet. Do not start the disassembling without detaching the power
cable from the computer system. Now remove the remaining external devices like
keyboard, mouse, moni
monitor,
tor, printer or scanner from the back of CPU cabinet.

Fig 10.3: Detach the Power Cable

Step 2. Remove the Cover: The standard way of removing tower cases used to be to undo the
screws on the back of the case, slide the cover back about an inch and lift it off. The
screwdrivers as per the type of screw are required to do the task.

Fig 10.4: Remove the Cover

Step 3. Remove the Adapter Cards: Make sure if the card has any cables or wires that might be
attached and decide if it would be easier to remove them before or after you remove the
card. Remove the screw if any, that holds the card in place. Grab the card by its edges,
front and back, and gently rock it lengthwise to release it.

Fig 10.5: Remove the Adapter Cards

Step 4. Remove the Drives: Removing drives is easier. There can be possibly three types of
drives present in your computer system, Hard disk drive, CD/DVD/Blu-ray drives, floppy
disk drives (almost absolute now a day). They usually have a power connector and a data
cable attached from the device to a controller card or a connector on the motherboard.
CD/DVD/Blu-ray drive may have an analog cable connected to the sound card for direct
audio output.
The power may be attached using one of two connectors, a Molex connector or a
Berg connector for the drive. The Molex connector may require to be wiggled slightly
from side to side and apply gentle pressure outwards. The Berg connector may just pull out
or it may have a small tab which has to be lifted with a screwdriver.
Now pull data cables off from the drive as well as motherboard connector. The
hard disk drive and CD/DVD drives have two types of data cables. IDE and SATA cables.
The IDE cables need better care while being removed as it may cause the damage to drive
connector pins. Gently wiggle the cable sideways and remove it. The SATA cables can be
removed easily by pressing the tab and pulling the connector straight back.
Now remove the screws and slide the drive out the back of the bay.
 Fig 10.6: Remove the Drives

Step 5. Remove the Memory Module: Memory modules are mounted on the motherboard as the
chips that can be damaged by manual force if applied improperly. Be careful and handle
the chip only by the edges. SIMMs and DIMMs are removed in a different way:
 SIMM - Gently push back the metal tabs while holding the SIMM chips in the socket.
Tilt the SIMM chip away from the tabs until a 45% angle. It will now lift out of the
socket. Put SIMM in a safe place.
 DIMM - There are plastic tabs on the end of the DIMM sockets. Press the tabs down
and away from the socket. The DIMM will lift slightly. Now grab it by the edges and
place it safely. Do not let the chips get dust at all.

Fig 10.7: Remove the Memory Module

Step 6. Remove the Power Supply: The power supply is attached into tower cabinet at the top
back end of the tower. Make sure the power connector is detached from the switchboard.
Start removing the power connector connected to motherboard including CPU fan power
connector, cabinet fan, the front panel of cabinet power buttons and all the remaining
drives if not detached yet.
Now remove the screws of SMPS from the back of the cabinet and the SMPS can
be detached from the tower cabinet.

Step 7. Remove the Motherboard:Before removing all the connectors from the motherboard,
make sure you memorize the connectors for assembling the computer if required, as that
may require connecting the connectors at its place. Remove the screws from the back of
the motherboard and you will be able to detach it from the cabinet. Now remove the CPU
fan from the motherboard. The heat sink will be visible now which can be removed by the
pulling the tab upward. Finally, the processor is visible now, which can be removed by the
plastic tab which can be pulled back one stretching it side way.
 Fig 10.8: Remove the Motherboard

10.3.2 Assembling the computer system: The assembling of the computer system is exactly the
opposite of disassembling operation. Before starting assembling the computer system, make sure
you have the screws and a screwdriver for those.

Step 1. Mount the Processor: The first step for assembling the computer system starts with
mounting the processor on the processor socket of the motherboard. To mount the process,
you don't need to apply any force. The special ZIF (zero insertion force) sockets are
usually used to prevent any damage to the processor pins. Once the processor is mounted,
the heat sink will be attached on top of the processor. The CPU fan is also attached on top
of the heat sink.

Step 2. Fix the Motherboard in the Tower Case: Now the motherboard is to be fixed vertically
in the tower case and the screws are fixed from behind of the motherboard.

Step 3. Connect the Power Supply: Now line up the power supply at the top back end of the
cabinet and screw it. The power connectors for motherboard power supply and CPU fan
power supply are to be connected. If the cabinet cooling FAN is required then it is to be
screwed at the back end grill of the cabinet and its power connector is to be connected
from SMPS.

Step 4. Install the Drives: Install the CD/DVD drives at the top front end of the cabinet and screw
it. Install the Hard disk drive and floppy disk drive below CD/DVD drive and screw it.
Make sure once screwed there is no vibration in either of the CD/DVD, hard disk or floppy
disk drives.

Step 5. Connect Cables: Now select the appropriate data cable and connect one end of the cable
to its drive socket and another end at its appropriate connector on the motherboard. For
SATA hard disk drive or CD/DVD drives use SATA cable and its power cable, else use
IDE data cable. Do the proper jumper settings as per the usage requirement.

Step 6. Mount the Memory Modules: It is time now to mount the memory modules on the
motherboard by aligning the RAM to its socket on the motherboard and press it
downward. Make sure the side tab are fixed into the RAM notch. If not, you may still have
to press a bit.
 Step 7. Install the Internal Cards: Install the internal cards to its socket and attach the cables or
power cable to it. The selection of right socket or slot is required as per the type of socket.

Step 8. Cover the Tower: Cover the tower by placing it and pressing towards front side and
screw it.

Step 9. Connect the External Devices and Power: Connect the external devices with CPU at its
appropriate socket. It includes mouse and keyboard at PS2 or USB connectors. Monitor at
the video output socket. Connect the power cable to the back of tower in SMPS. Plug in
the power cable to the electric board.

10.4 Result:Dismantling and assembling of PC has been done.

10.5 Precautions:

I. Connection should be done properly.

II. Don’t make connections with wet hands.
III. While doing connections main power supply should be off.

10.6 Viva Voce questions:

1. What is a computer?
2. What factors should be considered before disassembly and reassembly of a computer?
3. What brand of computer did you assemble and disassemble?
4. What tools are needed in assembling and disassembling a computer?
5. Computer expansion slots connects the interface cards to the
a) ports
b) peripheral devices
c) mother board
d) system bus
Ans. c

6. PCB stands for_______

a) print current board
b) printed circuit board
c) power circuit board
d) None of these
Ans. b

7. In a desktop computer, the board containing micro-processor, RAM and other components is called
_____board.
(a) graphics
(b) mother
(c) white
(d) None of these
Ans. b

8. CMOS in motherboard is expanded as ______.

(a) Customary Metal Oxide Semiconductor
(b) Complementary Mineral Oxide Semiconductor
(c) Complete Metal Oxide Semiconductor
(d) Complementary Metal Oxide Semiconductor
Ans. d

9. In motherboard, PATA stands for ______.

(a) Peripheral Advanced Technology Attachment
(b) Port Advanced Technology Attachment
(c) Parallel Advanced Technology Attachment
(d) Part Advanced Technology Attachment
Ans. c
10. The Backbone of computer is called ____
a) Mouse
b) Motherboard
c) SMPS
d) Monitor
Ans. b

11. What is motherboard?

a) Scanner and other things are part of motherboard
b) Keyboard otherwise known as motherboard
c) A circuit board which connects all the elements
d) It is a type of file server
Ans. c

12. The main circuit board in the system unit is also called the:
a) Busboard
b) Daughterboard
c) Chipboard
d) Motherboard
Ans. d

13. . Upgrading the BIOS is also known as ____

a) URoming
b) smoothing
c) flashing
d) forcing
Ans. c

14. Different components of the motherboard of a PC unit are linked together by sets of parallel
electrical conducting lines. What are these lines called?
a) Conductors
b) Buses
c) Connectors
d) Consecutives
Ans. b
15. The DC voltage on most circuit board is:
a) -12 volts
b) 0 volts
c) + 5 volts
d) +12 volts
Ans. c

16. Which of the following handles the interconnection between most of the devices and the CPU?
a) Northbridge
b) RAM
c) ROM
d) Southbridge
Ans. d

17. Where does the motherboard store the keyboard controller support program?
a) DRAM
b) hard drive
c) RAM
d) ROM chip
Ans. d

18. Which chip acts as a clock to keep the current date and the time?
a) CMOS
b) DVRAM
c) RAM
d) ROM
Ans. a

19. Which chip is used to store information that describes specific device parameters?
a) BIOS
b) CMOS
c) ROM
d) System BIOS
Ans. b

20. On PC power supplies, the wire attached to pin one is usually:

a) blue or red
b) blue or white
c) red or black
d) white or orange
Ans. d
21. When seeking to upgrade for a particular motherboard what do you need to know?
a) memory
b) hard drive
c) make& model
d) dimm
Ans. c

22. WRAM is used on a

a) modem
b) video card
c) motherboard
d) ata connector
Ans. b

23. he communication device that allows the computer to access a network is called a ____card.
a) modem
b) video
c) sound
d) network
Ans. d

24. A personal computer uses a number of chips mounted on a circuit board called
a) Microprocessor
b) System Board
c) Daughter Board
d) Mother Board
Ans. d

25. A port of computer may be connected to

a) expansion card
b) CPU
c) mother board
d) Both A and C
Ans. d