
1-15
1-15
1-15
1-15
1-15
Chapter 1 Motherboard Description
Chapter 1 Motherboard Description
Chapter 1 Motherboard Description
Chapter 1 Motherboard Description
Chapter 1 Motherboard Description
ATX Power Switch (PW_BN)
The system power is controlled by a momentary switch
connected to this lead. Pushing the button once will switch
the system ON.
Power LED Lead (PW_LED)
The system power LED lights when the system power is on.
Speaker Connector (SPEAKER)
The speaker (onboard or offboard) provides error beep code
information during the Power Self-Test when the computer
cannot use the video interface. The speaker is not connected to
the audio subsystem and does not receive output from the audio
subsystem.
Hard Drive LED Connector (HD_LED)
This connector supplies power to the cabinet IDE activity LED.
Read and write activity by devices connected to the Primary or
Secondary IDE connectors will cause the LED to light up.
Reset Switch Lead (RESET)
The connector can be connected to a momentary SPST type
switch that is normally open. When the switch is closed, the
motherboard resets and runs the POST.