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Chapter 4 • Disassembly and Power
Two common BIOS and adapter features that take advantage of ACPI are Wake on LAN and
Wake on Ring. The Wake on LAN feature allows a network administrator to control the power
to a workstation remotely and directs the computer
to come out of sleep mode. Software applications can
also use the Wake on LAN feature to perform updates,
upgrades, and maintenance tasks. The feature can also
be used to bring up computers immediately before
the business day starts. Wake on LAN can be used
with Web or network cameras to start recording when
motion is detected or to bring up a network printer so
that it can be used when needed. Wake on Ring allows a computer to come out of sleep mode
when the telephone line has an incoming call. This lets the computer receive phone calls,
faxes, and emails when the user is not present. Common BIOS settings related to ACPI are
listed in Table 4.4.
Table 4.3 ACPI operating states
Global system
state
Sleep
state
Description
G0 Working (S0) The computer is fully functional. Software, such as the autosave function
used with Microsoft products, can be optimized for performance or lower
battery usage.
G1 Sleeping Requires less power than the G0 state and has multiple sleeping states:
S1, S2, S3, and S4.
(S1) CPU is still powered, and unused devices are powered down. RAM is still
being refreshed. Hard disks are not running.
(S2) CPU is not powered. RAM is still being refreshed. System is restored
instantly upon user intervention.
(S3) Power supply output is reduced. RAM is still being refreshed. Some info in
RAM is restored to CPU and cache.
(S4) Lowest-power sleep mode and takes the longest to come up. Info in RAM
is saved to hard disk. Some manufacturers call this the hibernate state.
G2 (S5) Also called soft off. Power consumption is almost zero. Requires the
operating system to reboot. No information is saved anywhere.
G3 Also called off, or mechanical off. This is the only state where the
computer can be disassembled. You must power on the computer to use
it again.
Windows power management
Use the Power Options link from within the System
and Security Control Panel to configure power from
within the Windows environment.
Tech
Tip
Table 4.4 Common BIOS power settings
Setting Description
Delay Prior to Thermal Defines the number of minutes the system waits to shut down the system
once an overheating situation occurs.
CPU Warning Temperatures Specifies the CPU temperature at which a warning message is displayed
on the screen.
ACPI Function Enables or disables ACPI. This is the preferred method for disabling ACPI
in the event of a problem.
- 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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