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
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
2
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
3
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.