Compaq Presario 1800T Maintenance And Service Manual page 22

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Power Management for Windows 98
The following power management features are available for conserving AC power and extending battery operating time:
Power Management Settings
Hibernation Mode
Sleep Mode
Battery Operating Time
Rebooting After a Lockup
Recovering From a Loss of Electrical Power
Servicing the Computer - Full Off Mode
Power Management Settings
Differing patterns of computer use determine the level of power management. These different power management levels
can be activated based on the amount of time passed since the last system activity. System activity examples include
keyboard or mouse movement, DVD/CD playback (while under program control that monitors Sleep), and modem use.
Select different power settings or schemes through Power Management.The optional settings are Home/Office Desk,
Portable/Laptop, and Always On. Change the following settings from the default settings:
when the computer goes into Sleep (Standby) mode
when the screen times out and goes blank
when the hard drive goes into low power mode.
Each of these system components sleeps after the selected or default periods of inactivity. (The setting for hard drive must
be less than or equal to the setting for System.)
IMPORTANT: If the computer is on a network, Compaq recommends System Standby be set to Never.
There are five categories of power management settings under the Control Panel. The default setting for each feature is
listed below in the tables.
Power Management Properties
Always on
System Standby
Turn OFF Monitor
Turn OFF Hard Disks
Portable/Laptop
System Standby
Turn OFF Monitor
Turn OFF Hard Disks
Home/Office Desk
System Standby
Turn OFF Monitor
Turn OFF Hard Disks
CAUTION: The settings on the Alarms tab have been preset for the computer to run at
its best. Changing any of these settings could cause the computer to function improperly.
It is recommended that these settings be left at their default values.
Alarms:
Low Battery Alarm:
Critical Battery Alarm
Alarm Actions:
Compaq Presario 1800 Series Computers have two levels of power management: Hibernation and Sleep.
Hibernation mode occurs by pressing the Power button once. The computer saves the contents of the computer memory
to the hard drive. This is followed by the computer turning off.
Sleep mode is a low-power mode, also referred to as Standby mode. It occurs by pressing the Fn+F4 function key or by
clicking the Start button, then Shutdown, then Standby.
CAUTION: While in Sleep mode, the computer will maintain system information and open
files. Unsaved information will be lost if the computer is turned off prior to system wake-
up, or if a power loss occurs while using the AC adapter.
The following table shows the conditions and indicators for getting in and out of the various power management modes,
Sleep, Hibernation, and Off.
Hibernation and Sleep Functions
Mode
Sleep
Hibernate
Off
Hibernation Mode
Hibernation helps conserve battery life and protect the data. Hibernation can be a routine power-saving event or the result
of a low battery. As the computer enters Hibernation, it automatically saves the content of the computer memory to the
hard drive before it turns off.
The computer will automatically enter Hibernation mode when the battery has little power left or when the computer
(operating on battery power) has been in Sleep mode for more than one hour. Activate Hibernation mode by pressing the
Power button once.
To restart the computer, press the Power button once. When the computer enters or wakes from Hibernation mode, it
displays a Progress window.
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Sleep Mode
Selecting Sleep mode instead of turning off the computer when finished allows the computer to wake up faster than turning
it completely off and saves power over the active (On) mode.
Activate Sleep mode by pressing Fn+F4.
Servicing the Computer - Full Off Mode
The computer must be turned off completely when installing or replacing components in the system. Follow the instructions
above for properly putting the computer into Off mode, unplug from the outlet, and remove the battery
section for instruction on removing battery).
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Rebooting After a Lockup
To reboot the computer (as if from a cold start), when the keyboard is frozen or the screen is locked, press and hold down
the Power button for at least four seconds, which will cause a manual shutdown. Then, restart it with a single press of the
Power button. If it still does not recover, press the Power button and hold for four seconds to shut it down, then remove
the battery or unplug the AC power for at least 30 seconds. Reinsert the battery or reconnect AC power and press the
Power button once to reboot.
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Recovering From a Loss of Electrical Power
Loss of electrical power will cause the Internet PC to automatically turn off. This may cause loss of data because the
Microsoft Windows operating system is not able to properly close all files and programs.
Loss of power may be caused by one of the following:
Electrical power service is interrupted.
The power cord is accidentally disconnected.
If power surges or sags, the display and status lights may flicker, and the computer may automatically restart. If an
improper shutdown occurs, ScanDisk, a Microsoft Windows utility program, will automatically run once power is restored.
ScanDisk will determine if the improper shutdown caused any errors on the hard disk. These errors may occur if the
Microsoft Windows operating system was not able to properly close all files before the shutdown. If no errors are found, the
restart process will continue. If ScanDisk does detect errors, follow the instructions shown to continue the restart process.
Work that was not saved prior to the lockup may be lost.
Use of a surge suppressor, line conditioner, or uninterruptible power supply (UPS) may protect the computer from damage
caused by power surges or sags.
If a power failure occurs or the power cord disconnects while the computer is turned on, turn off the computer until normal
service has been restored. ScanDisk may run to check the hard disk for errors caused by the improper shutdown the next
time the computer turns on.
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Battery Operating Time
Battery operating time is affected by variables such as the following:
For more information on increasing battery pack operating time, conditioning the battery pack, and disposing of a used
battery pack, refer to the
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Maintenance & Service Guide
Presario 1800 Series
Models: 1825 and 1800T
Pin Assignments | Battery Pack Operations
Plugged in
Never
15 minutes
1 hour
Plugged in
Never
3 hours
15 minutes
Plugged in
20 minutes
15 minutes
30 minutes
Power Management Properties
10%
0%
Notification: Text
Power Mode: No Action
To Initiate
Manual - Fn+F4 key
combination or click the Start
button on the Windows Taskbar,
then point to Shutdown, then
click Standby.
Time-Out Default - 15 minutes
if using battery power.
Computer will not automatically
enter Sleep mode if on AC
power.
Manual - Press Power Button
once
Time-Out Default - If your
battery is low or after 1 hour of
Sleep. Computer will not
automatically enter Hibernation
mode if on AC power.
Standard - Perform normal
Windows shutdown using the
Start button on the Windows
Taskbar.
Manual* - Press and hold down
the Power button for 4 seconds.
*The Manual shutdown mode is
not recommended unless the
Standard shutdown mode does
not work.
Or, click Start, select the Shut Down option, and click Standby.
Power conservation settings
Hardware configuration
Software applications
Installed options
Display brightness
Hard drive usage
Changes in operating temperature
Type and number of installed PC Cards
Battery Pack Operations.
Running on Batteries
5 minutes
2 minutes
3 minutes
Running on Batteries
15 minutes
Never
10 minutes
Running on Batteries
1 minute
2 minutes
10 minutes
To End Indicators
Flashing Power light*
Press any key.
*Moon icon appears on status display
(1800 Series only)
Power light is off, screen is blank*
*Power icon does not appear on status
Press Power
display (1800 Series only)
Button once
Press Power
No Power light (or icon), screen is blank.
Button once
(see battery