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Power Supply Form Factors
139
Disassembly
and Power
4
Tech
Tip
Tech
Tip
Tech Tip
Figure 4.19 shows a few ATX power supply connectors. Figure 4.20 shows more ATX power
supply connectors.
4-pin CPU power connector SATA power connector 6-pin PCIe power connector
Figure 4.19 Common power supply connectors
Not all 24-pin motherboard connectors accept 20-pin power supply
connectors
You can purchase a 24-pin to 20-pin power adapter. The site http://www.formfactors.org
provides information regarding power supply form factors.
CPU 8-pin
connector
Fan speed
monitor connector
PCIe power
connector: 6-pin
4-pin Molex
power connector
4-pin floppy
power connector
Main power
connector: 24-pin
P4 CPU 4-pin
connector
Figure 4.20 ATX power supply connectors
Figure 4.21 illustrates the compatibility between the ATX 20- and 24-pin motherboard
connector standards. Notice in Figure 4.21 that the power cable is only one connector, notched
so the cable inserts into the connector one way only. This is a much better design than older
power supplies, where two connectors were used and could be reversed. Also, notice that a
power good signal (labeled PWR_OK in Figure 4.21) goes to the motherboard. When the
computer is turned on, part of POST is to allow the power supply to run a test on each of
the voltage levels. The voltage levels must be correct before any other devices are tested and
allowed to initialize. If the power is okay, a power good signal is sent to the motherboard. If the
power good signal is not sent from the power supply, a timer chip on the motherboard resets
the CPU. Once a power good signal is sent, the CPU begins executing software from the BIOS.
Figure 4.21 also shows the +5vsb connection to provide standby power for features such as
Wake on LAN or Wake on Ring (covered later in this chapter).
- 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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