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J2: System Function Connector
J2 provides connectors for system indicators that provide light indication of the computer activities and switches to
change the computer status. J2 is a 20-pin header that provides interfaces for the following functions
Pin 2, 4, 6, 8: Speaker
This connector provides an interface to a speaker for audio tone generation. An 8-ohm speaker is
recommended.
Pin 1, 3, 5: Power LED
The power LED indicates the status of the main power switch.
Pin 13, 14: ATX Power ON Switch
This 2-pin connector is an “ATX Power Supply On/Off Switch” on the system that connects to the power switch
on the case. When pressed, the power switch will force the system to power on. When pressed again, it will
force the system to power off.
Pin 17, 18: Reset Switch
The reset switch allows the user to reset the system without turning the main power switch off and then on
again. Orientation is not required when making a connection to this header.
Pins 19, 20: HDD LED
This connector connects to the hard drive activity LED on control panel. This LED will flash when the HDD is
being accessed.
J5: VGA Connectors
