_LAB 4 - Power (2)

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Electrical Engineering

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Apr 3, 2024

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PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 ============================================================= Instructions: Use pen and write your Full name and student ID on all pages. All labs have to be done during lab time, in the lab room. Each lab has to be checked by the instructor progressively during lab time. You must call your instructor to check your work and sign it whenever you reach the point asking for the instructor’s initials or signature. ============================================================= Objectives: After completing this lab, you will demonstrate the ability to: ● Identify the form factor of the case, motherboard and power supply ● Use Multimeters ● Do Continuity check ● Check a LAN Cable ● Check a power supply fuse ● Check ATX-style motherboard DC voltage ● Check Berg and Molex connectors Suggested Readings : Textbook Chapter 4 Parts Needed: ● Multimeter ● Fuses ● Wire ● LAN cable ● ATX-style systems Activity : The form factor is a set of specifications about the size, shape, and configuration of the components that make up the system. Lab 4.1 Identify Form Factors Page 1 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 1. Use a favorite Internet search engine, search for ATX power supplies. a) What is the number of pins an ATX power supply connector has? 24 pins b) How do we call this connector? Molex Mini fit Jr c) Is there any difference between ATX and BTX power supply? Yes. The difference between them is ATX's component arrangement hindered airflow that resulted in less cooling. When BTX came, the location and design of the components (processor chip, northbridge chip) was altered which made this form factor better than the ATX board in terms of cooling. This became the biggest advantage of BTX over ATX. Lab 4.2 Multimeters A multimeter is an electrical / electronic device that performs continuity tests and measures resistance, amperage, and voltage. Multimeters have analog or digital output display and have two leads (probes) used to contact the component you are testing. Continuity check 1. Obtain two pieces of wire and strip the ends. Ten to fifteen centimeters long is enough. 2. Lay the cable horizontally in front of you. Refer the left side as Connector A and the right side as Connector B. 3. Set your multimeter to measure resistance (Ohms). 4. Turn the multimeter on. 5. Place the red probe on connector A and the black probe on connector B. 6. What is the reading on your multimeter, and what does this mean regarding the continuity of the test cable? 00.0. This means the cable is working properly. Page 2 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 7. Keep the probes connected as above and cut the wire in the middle. Alternatively, use two pieces of wire, which is the same as having one piece cut in two. 8. What is now the reading of your meter, and what does it mean regarding the continuity of the wire? 1 . This MEans that the cable is damaged in some way Lab 4.3 LAN Cable check 1. Obtain a piece of LAN cable. Ten to fifteen centimeters long is enough. 2. Strip the ends of the wires and lay the cable horizontally in front of you. 3. Set your multimeter to measure resistance 4. Turn on the multimeter 5. Check the continuity of each wire. Place the red probe on the white and green wire , keep the red probe connected to the white and green wire, and connect the black probe to every other wire at the other end in the following order and state the measured resistance. a. Brown (1) b. Brown and white (1) c. Orange (1) d. Orange and white (1) e. Blue (1) f. Blue and white (1) g. Green (1) h. Green and white (0.00) 6. Using the table below, draw a line from the left side wire to any wire on the right site that shows zero resistance. Left Site Wire Right Site Wire Brown Brown Brown and white Brown and white Orange Orange Orange and white Orange and white Blue Blue Blue and white Blue and white Green Green Green and white Green and white Page 3 of 9

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PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 7. What is the resistance reading between the left side brown and right side green? 1 If you suspect a cable is not working, what test would you perform? Cable test using the RJ45 network cable tester. What do you expect the meter reading to be if there is some discontinuity? high resistance, meter reading is 1 Instructor’s initials: Lab 4.4 Fuse check Many times the power supply is not functioning simply because its fuse is blown up. Although opening and the power supply and touching the wrong components may be extremely dangerous, changing the fuse will cost much less than replacing the power supply. It is strongly suggested though NOT to open the power supply unless you really know what you are doing. 1. Obtain two fuses from your Instructor, one good and one blown (the wire inside the fuse is broken). Return them when you finished with this procedure. 2. On the fuse there must be some indication of its amperage and voltage rating. What is the rating on either one of the fuses? 250V 2A 3. Set your multimeter to read ohms. 4. Power on the meter. 5. Connect the red probe of the multimeter to one end and the black to the opposite end of the good fuse. 6. What is the resistance of the fuse? 00.0 7. What reading did you anticipate if the fuse were not good? 1 8. What is the actual measurement? 1 Page 4 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 Lab 4.5 . ATX-style motherboard DC voltage check 1. Power off the HP Compaq dc5700 Windows 7 - sandbox system and remove its cover. 2. What is the form factor of the motherboard and power supply? Desktop ATX . ATX 320W(power supply). ATX motherboard 3. Power on the computer. 4. Set the multimeter to read DC Voltage and set its calibration to read max. 20V 5. Turn on the multimeter. 6. With the computer on, and the power connectors attached on the motherboard, place the multimeter’s black probe to any one of the power supply’s black lead , and keep it there. Use a piece of stripped wire if the probe does not fit. 7. Place the red probe of your multimeter to each one of the other leads of the power supply and fill in the table below with your measurements. Pin Number -color Measured Voltage 1 orange 3.34 2 orange & brown 3.34 3 orange 3.34 4 blue -11.93 5 black 0 6 black 0 7 red 5 8 green 0.07 9 black 0 10 black 0 11 red 5 12 black 0 13 black 0 14 black 0 15 white 5 16 empty socket NA 17 purple 5.09 18 red 5 19 yellow 12.05 20 red 5 21 yellow 12.06 22 red 5 23 orange 3.34 24 black 0 Page 5 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 8. What is the maximum and minimum voltage measured? Maximum: 21, yellow, 12.06 Minimum: 4, blue, -11.93 Instructor’s initials: Lab 4.6. Molex connector check Certain times one of your devices may not be working properly. One reason could be that it does not receive the proper level of power or even no power at all although your power supply is up and running. The problem could be a faulty connector (Molex or SATA) 1. Power on the Windows 7 computer if not already on. 2. Set the multimeter to read DC Voltage and set its calibration to read max. 20V. 3. Turn on the multimeter, if not on. 4. With the computer on , locate one of the Molex connectors. With Molex connector attached on the device, place the multimeter’s black probe to any one of the connector’s black lead, and keep it there. 5. Place the red probe of your multimeter to each one of the other leads of the connector and fill in the table below with your measurements. Color Pin Voltage Measurement Black 0 Red 5.01 Yellow 12.06 Page 6 of 9

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PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 Lab 4.7. Berg connector check 1. With the same settings and the computer on, locate one of the Berg connectors. With Berg connector attached on the device, usually the floppy drive, place the multimeter’s black probe to any one of the connector’s black lead, and keep it there. 2. Place the red probe of your multimeter to each one of the other leads of the connector and fill in the table below with your measurements. Color Pin Voltage Measurement Black 0 Red 5 Yellow 12.06 3. Turn off the Windows 7 system and disconnect the main power connector from the motherboard. Place the red probe of your multimeter to each one of the other leads of the connector and fill in the table below with your measurements. No power to Main Board Color Pin Voltage Measurement Black 0 Red 0 Yellow 0 Call your Instructor to verify your measurements. Instructor’s Initials: Page 7 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 Lab 4.8. CHOOSE THE RIGHT POWER SUPPLY Running a system with an inadequate power supply can cause the power supply to wear out faster than normal. Also, an inadequate power supply can cause the system to reboot at odd times and exhibit other types of intermittent errors. Choosing an overrated power supply is not wise because a lot of the power is wasted by blowing it out as wasted heat. In the other hand, you must also take precautions for feature upgrades. When selecting a system’s power supply you must look at the system’s components as a whole and how the system is being used now or will be used in the feature. The following table lists the components you may have in a system and the average estimated power for each component. Open the HP Compaq system (Windows 8.1), locate each component listed in the table, and record how many components are present. Not all components will be present. Component Wattage required How many present Total wattage Core i7 CPU 100 W average 1 100 W PCI Express video card 100 W average 0 0 Average PCI cards 10 W 2 20 W SATA DVD/CD drives 25 W average 1 25 W Blue Ray 25 W 0 0 SATA Hard drives 10 W average 1 10 W Case and CPU fans 3 W each 2 6 W Motherboard 75 W average 1 75 W DDR3 4 W per stick 2 8 W Power Supply fan 10 W 1 10 W Wattage 254 W Add 30% Total Wattage 330.2 W Based on the wattage your system needs, what power supply are you going to purchase? Corsair Semi-Modular ATX CX450M Power Supply CP-9020101-NA ($89.99) Instructor’s initials: Page 8 of 9

PC Hardware LAB 4 - Power Student name: Rahul Gharti Student ID: 301282653 Student Name Rahul gharti Student ID: 301282653 Date Due: Date Submitted: Student Signature: Note: ON THE DUE DATE RETURN ONLY THIS PAGE TO YOUR INSTRUCTOR FOR MARKING. It is the student’s responsibility to have the Instructor sign all steps stated in the Lab. Failing to do so will result in the loss of marks. In addition, 10% will be deducted for each day late. Check Points Instructor’s Signature Date and Time Page # Step 4 6 7 8 Page 9 of 9

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