HP Nc6140 - Notebook PC User manual

Power

Document Part Number: 396324-001

December 2005

This guide explains how the computer uses power.

Power ii

Contents

1 Power control and light locations

2 Power sources

Connecting the AC adapter . . . . . . . . . . . . . . . . . . . . . . . 2–2

3 Standby and hibernation

Standby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

Hibernation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2

Initiating standby, hibernation or shutdown. . . . . . . . . . . 3–4

When you leave your work . . . . . . . . . . . . . . . . . . . . 3–4

When a reliable power supply is unavailable . . . . . . 3–5

When using wireless communication, or readable or

writable drive media . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

4 Default power settings

Turning the computer or display on or off . . . . . . . . . . . . 4–2

Using emergency shutdown procedures. . . . . . . . . . . . . . 4–3

Initiating or resuming from standby. . . . . . . . . . . . . . . . . 4–4

Initiating or restoring from hibernation . . . . . . . . . . . . . . 4–5

5 Power options

Accessing Power Options Properties . . . . . . . . . . . . . . . . 5–1

Displaying the Power Meter icon. . . . . . . . . . . . . . . . . . . 5–2

Setting or changing a power scheme . . . . . . . . . . . . . . . . 5–3

Setting a security prompt . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

iii Power

Contents

6 Processor performance controls

7 Battery packs

Identifying battery packs . . . . . . . . . . . . . . . . . . . . . . . . . 7–2

Inserting or removing the primary battery pack. . . . . . . . 7–3

Charging multiple battery packs . . . . . . . . . . . . . . . . . . . 7–5

Charging a battery pack . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6

Monitoring the charge of a battery pack . . . . . . . . . . 7–8

Managing low-battery conditions . . . . . . . . . . . . . . . . . 7–10

Identifying low-battery conditions . . . . . . . . . . . . . 7–10

Resolving low-battery conditions . . . . . . . . . . . . . . 7–12

Calibrating a battery pack . . . . . . . . . . . . . . . . . . . . . . . 7–14

When to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14

How to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14

Conserving battery power . . . . . . . . . . . . . . . . . . . . . . . 7–19

Conserving power as you work . . . . . . . . . . . . . . . . 7–19

Selecting power conservation settings. . . . . . . . . . . 7–20

Storing a battery pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–21

Disposing of a used battery pack . . . . . . . . . . . . . . . . . . 7–22

Index

Power 1–1

Power control and light

locations

The following illustration and table identify and describe the

power control and light locations.

Component Description

1Display switch Puts the computer in standby if the display

is closed while the computer is on.

2Power lights* (2) Green: The computer is on.

Blinking green: The computer is in standby.

Off: The computer is off or in hibernation.

(Continued)

1–2 Power

Power control and light locations

3Power button When the computer is

■Off, press to turn on the computer.

■In standby, briefly press to exit standby.

■In hibernation, briefly press to exit

hibernation.

If the computer has stopped responding

and Microsoft® Windows® shutdown

procedures cannot be used, press and hold

the power button for at least 5 seconds to

turn off the computer.

4fn+f3 Initiates standby.

5Battery light Amber: A battery pack is charging.

Green: A battery pack is close to full charge

capacity.

Blinking amber: A battery pack that is the

only available power source has reached a

low-battery condition. When the battery

reaches a

critical

low-battery condition, the

battery light begins blinking more quickly.

Off: If the computer is plugged into an

external power source, the light is turned

off when all batteries in the computer are

fully charged. If the computer is not

plugged into an external power source, the

light is turned off until the battery reaches a

low-battery condition.

*There are 2 power lights. Both display the same information. The light on

the power button is visible only when the computer is open; the other power

light is always visible on the front of the computer.

Component Description

Power 2–1

Power sources

The computer can run on internal or external AC power. The

following table indicates the best power source for common

tasks.

Task Recommended Power Source

Work in most software

applications

■Charged battery pack in the computer

■External power supplied through one of

the following devices:

❐AC adapter

❐Optional docking device

❐Optional power adapter

Charge or calibrate a battery

pack in the computer

External power supplied through

■AC adapter

■Optional docking device

■Optional power adapter

ÅDo not charge the computer battery pack

on board aircraft. Charging the battery

pack may damage aircraft electronic

systems.

Install or modify system

software or write to a CD

or DVD

External power supplied through

■AC adapter

■Optional docking device

■Optional power adapter

2–2 Power

Power sources

Connecting the AC adapter

ÅWARNING: To reduce the risk of electric shock or damage to

your equipment:

■Plug the power cord into an AC outlet that is easily accessible

at all times.

■Disconnect power from the computer by unplugging the power cord

from the AC outlet (not by unplugging the power cord from

the computer).

■If provided with a 3-pin attachment plug on your power cord, plug

the cord into a grounded (earthed) 3-pin outlet. Do not disable the

power cord grounding pin; for example, by attaching a 2-pin

adapter. The grounding pin is an important safety feature. It is

possible to receive an electric shock from a system that is not

properly grounded.

To connect the computer to external AC power:

1. Plug the AC adapter into the power connector on the

computer 1.

2. Plug the power cord into the AC adapter 2.

3. Plug the other end of the power cord into an AC outlet 3.

Power 3–1

Standby and hibernation

Standby and hibernation are energy-saving features that conserve

power and reduce startup time. They can be initiated by you or by

the system. For more information, refer to “Initiating standby,

hibernation or shutdown.”

Standby

ÄCAUTION: To avoid a complete battery discharge, do not leave the

computer in standby for extended periods. Connect the computer to an

external power source.

Standby reduces power to system components that are not in use.

When standby is initiated, your work is stored in random access

memory (RAM), and then the screen is cleared. When the

computer is in standby, the power lights blink. When you resume

from standby, your work returns to the screen where you left off.

ÄCAUTION: To reduce the risk of information loss, save your work

before initiating standby.

3–2 Power

Standby and hibernation

Hibernation

ÄCAUTION: If the configuration of the computer is changed during

hibernation, resuming from hibernation may not be possible. When the

computer is in hibernation:

■Do not dock the computer in or undock the computer from a

docking device.

■Do not add or remove memory modules.

■Do not insert or remove hard drives or optical drives.

■Do not connect or disconnect external devices.

■Do not insert or remove an external media card, such as a

MultiMediaCard or a PC Card.

Hibernation saves your work to a hibernation file on the hard

drive, and then shuts down the computer. The power lights are

turned off. When you restore from hibernation, your work returns

to the screen where you left off. If you have set a power-on

password, you must enter that password to restore from

hibernation.

ÄCAUTION: To reduce the risk of information loss, save your work

before initiating hibernation.

Standby and hibernation

Power 3–3

You can disable hibernation. However, if hibernation is disabled

and the system reaches a low-battery condition, the system will

not automatically save your work while power is on or when

standby has been initiated.

Use Power Options in Microsoft® Windows® Control Panel to

reenable hibernation:

»Select Start > Control Panel > Performance and

Maintenance > Power Options > Hibernate tab.

Be sure that the Enable hibernation check box is selected.

To set the time interval after which the system initiates

hibernation:

1. Select Start > Control Panel > Performance and

Maintenance > Power Options > Power Schemes tab.

2. Click one of the intervals in the System hibernates list.

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