Compaq Nw9440 - Mobile Workstation User manual

Power

Document Part Number: 396855-001

March 2006

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. . . . . . . . . . . . . . . . . 4–3

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 . . . . . . . . . . . . . . 7–11

Calibrating a battery pack . . . . . . . . . . . . . . . . . . . . . . . 7–13

When to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13

How to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13

Conserving battery power . . . . . . . . . . . . . . . . . . . . . . . 7–18

Conserving power as you work . . . . . . . . . . . . . . . . 7–18

Selecting power conservation settings. . . . . . . . . . . 7–19

Storing a battery pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–20

Disposing of a used battery pack . . . . . . . . . . . . . . . . . . 7–21

Index

Power 1–1

Power control and

light locations

The following illustration and table identify and describe the

power control and light locations.

✎Your computer may look slightly different from the illustration

in this section.

1–2 Power

Power control and light locations

Component Description

1Power lights* (2) On: The computer is on.

Blinking: The computer is in standby.

Blinking rapidly: An HP Smart AC

Adapter (hereafter referred to as AC

adapter) with a higher power rating

should be connected.

Off: The computer is off or in

hibernation.

(Continued)

Power control and light locations

Power 1–3

2Power button When the computer is

■Off, press to turn on the computer.

■On, press to enter hibernation.

■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.

3fn+f3 Initiates standby.

4Battery 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 stays

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.

✎Older AC adapters will not work with this computer.

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 included with the computer

❐Optional docking device

❐Optional power adapter

Charge or calibrate a battery

pack in the computer

External power supplied through

■AC adapter included with the computer

■Optional docking device

■Optional power adapter

ÅDo not charge the computer battery pack

on board aircraft.

Install or modify system

software or write to a CD

or DVD

External power supplied through

■AC adapter included with the computer

■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 the

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 the 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.

Power sources

Power 2–3

To connect the computer to external AC power:

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

side of the computer.

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

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

Depending on the AC adapter connected, one of the following

pop-up messages may be displayed after turning on the computer:

■“Smart AC adapter power output is too low for this

computer.” Clicking the message will display the following

additional information:

“The output power of the HP Smart AC Adapter connected

to your computer is insufficient. Please connect a higher

capacity adapter.”

■“For full performance, connect a higher capacity AC

adapter.” Clicking the message will display the following

additional information:

“The HP Smart AC Adapter connected will power the

computer, but at reduced performance. Please connect a

higher capacity adapter for full performance.”

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.

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