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Maintenance & Service Guide
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MSG Index | Product Description | Troubleshooting | Illustrated Parts |
Home | Removal & Replacement | Jumpers & Switches | Specifications |
Compaq Presario 7900 Series Personal Computers use ACPI (Advanced Configuration and Power Interface) for system power management. ACPI is an open industry specification that provides reliable power management through improved hardware and operating system coordination.
The following is a list of the power management features:
Power Status Lights. You can quickly tell the sleep condition of the system by glancing at the Power Status Lights on the unit or keyboard.
Automatic Sleep. In Windows 98, there are different Power Schemes under which the system goes into Sleep mode automatically when it times out. The optional settings for Windows 98 are Home/Office Desk, Portable/Laptop, and Always On. The system supports different levels of power management for varying patterns of computer usage.
Default and Adjustable timeout settings. The default setting for Sleep timeout is 30 minutes. The Sleep timeout value can be set in the Control Panel by clicking the Power Management icon. At the Properties screen, click System Standby, Turn off Monitor, and Turn off Hard Disk to set the length of time before the system goes to sleep.
Manual Sleep. To manually put your computer into sleep mode in the Windows 98 desktop, press the Sleep button (on the keyboard). The power status light on the CPU will light to show that Sleep mode is activated.
Other manual standby options. Another way to put your computer into sleep mode manually under Windows 98 is to select Start, then Shutdown. Select Standby from the list of choices to put the system into Sleep mode. The system can then be turned off or left in Sleep. When the Sleep button is pressed, the system returns to the previous Windows 98 Desktop state.
Wake-up events. Events that bring a system back to the working state include:
Pressing the Sleep button on the keyboard
Pressing the CPU Power button
Answering a call from Fax/Modem
Synchronized software and hardware volume control buttons.
Power management can be defined by three distinct power states in which the computer operates: On, Off, and Sleep. The following table describes the power states and lists the power consumption of each state:
Power Management States |
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Energy State | Description | Power Consumption |
On | Power is available to the system. The AC cable is connected, and the power status light is green. | 90 Watts avg., 110 Watts max |
Off | Power is not available to the system and the AC cable is disconnected. The power status light is not lit. | 0 Watts |
Soft Off | Power is available to the system, the AC cable is connected, and the power status light is off. | 1-2 Watts |
Sleep | Power is available to the system, the AC cable is connected, and the computer is in a low power/standby mode. The power status light is amber. | 27 Watts |