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Chapter 4 • Disassembly and Power
Lab 4.3 Amps and Wattage
Objective: To determine the correct capacity and wattage of a power supply
Parts: Power supply
Internet access (as needed)
Procedure: Complete the following procedure and answer the accompanying questions.
1. Locate the documentation stenciled on the power supply, if possible.
Can you determine from the documentation how many amps of current the power supply
is rated for at 5 volts? If not, proceed to Optional Step 2.
2. Optional: Use the Internet to find the power supply’s documentation on the manufactur-
er’s website. Use the information you find to answer the remaining questions.
How many amps is the power supply rated for at 5 volts?
How many amps is the power supply rated for at 12 volts?
How many +12V rails does the power supply have?
What is the maximum rated output power of the power supply in watts?
Instructor initials: _____________
Lab 4.4 Continuity Check
Objective: To perform a continuity check on a cable and find any broken wires
Parts: Multimeter
Cable and pin-out diagram
Procedure: Complete the following procedure and answer the accompanying questions.
1. Obtain a meter, cable, and pin-out diagram from your instructor.
2. Set the meter to ohms.
3. Power on the meter.
4. Lay the cable horizontally in front of you. The connector on the left is referred to as
Connector A. The connector on the right is referred to as Connector B.
5. Determine the number of pins on the cable connector. On a separate sheet of paper, write
numbers vertically down the left side of the paper, similar to the numbering used in Lab
4.5. There should be a number for each connector pin. At the top of the numbers write
Connector A as the heading. Create a corresponding set of identical numbers vertically on
the right side of the paper.
6. Check the continuity of each wire. Document your findings by placing a check mark
beside each pin number that has a good continuity check.
What meter setting did you use to check continuity, and what meter symbol is used for
this setting?
7. Power off the meter and return all supplies to the instructor.
Instructor initials: _____________
- Guide to PCs 2
- Complete CompTIA 3
- Contents at a Glance 4
- Contents 10
- Contents 11
- About the Author 19
- Dedication 20
- Acknowledgments 20
- We Want to Hear from You! 21
- Reader Services 21
- It Pays to Get Certified 22
- CompTIA Career Pathway 23
- Steps to Certication 23
- Content Seal of Quality 24
- Why CompTIA? 24
- Introduction 25
- Organization of the Text 26
- Features of This Book 27
- IT work 31
- CompTIA A+ Exam Objectives 32
- CompTIA Exam Objectives 33
- Disassembly 36
- Disassembly Overview 37
- Electrostatic Discharge (ESD) 37
- Opening the Case 41
- Cables and Connectors 41
- Snug connections 43
- Storage Devices 45
- Motherboards 46
- Mobile Device Issues 47
- Reassembly 49
- Preventive Maintenance 49
- Basic Electronics Overview 51
- Electronics Terms 51
- Good connection Broken wire 53
- Power Supply Overview 54
- Power Supply Form Factors 55
- Tech Tip 56
- Purposes of a Power Supply 58
- Power Supply Voltages 60
- Mobile Device Power 61
- Keep Li-ion batteries cool 63
- Power Interface) 64
- Windows power management 65
- Watch the wattage 68
- Solving Power Supply Problems 70
- Adverse Power Conditions 71
- Adverse Power Protection 72
- Surge Protectors 72
- Line Conditioners 74
- Figure 4.32 Line conditioner 75
- Figure 4.33 Sine wave and 75
- Standby Power Supply (SPS) 77
- Electrical Fires 78
- Computer Disposal/Recycling 79
- Chapter Summary 81
- Review Questions 82
- Exercises 85
- External Cables 86
- Computer Case Removal 86
- Adapter Placement 86
- Motherboard 88
- Lab 4.3 Amps and Wattage 89
- Lab 4.4 Continuity Check 89
- Lab 4.5 Pin-Out Diagramming 90
- Lab 4.6 Fuse Check 91
- Lab 4.7 Using a Multimeter 91
- Figure 4.38 AC outlet 93
- GND to hot 120VAC 93
- GND to neutral 0VAC 93
- Hot to neutral 120VAC 93
- +5 volts 95
- +12 volts 95
- Activities 97
- Critical Thinking Skills 99
- A+ Certification Exam Tips 99
- Complete PC Restore tool 107
- FireWire 114
- IRQs (Interrupt Requests) 120
- PBs (petabytes) 129
- Setup program 136
- SSDs (solid state drives) 138
- SSDs (solid state drives) 139
- TBs (terabytes) 140
- troubleshooting 143
- video 145
- Windows 147
- Windows Vista 148
- Windows Vista 149
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