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11. System panel connector (20-8 pin PANEL)
This connector supports several chassis-mounted functions.
•
System power LED (2-pin PLED)
This 2-pin connector is for the system power LED. Connect the chassis power LED
cable to this connector. The system power LED lights up when you turn on the system
power, and blinks when the system is in sleep mode.
•
Hard disk drive activity LED (2-pin +IDE_LED)
This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable
to this connector. The IDE LED lights up or ashes when data is read from or written to
the HDD.
•
System warning speaker (4-pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
•
Power/Soft-off button (2-pin PWRSW)
This 2-pin connector is for the system power button. Pressing the power button turns
the system ON or puts the system in SLEEP or SOFT-OFF mode depending on the
BIOS settings. Pressing the power switch for more than four seconds while the system
is ON turns the system OFF.
•
Reset button (2-pin Reset)
This 2-pin connector is for the chassis-mounted reset button for system reboot without
turning off the system power.
M3N78-CM
R
M3N78-CM
System Panel Connector
PANEL
PLED-
+5V
Speaker
SPEAKER
PLED
Ground
Reset
Reset
Ground
Ground
PLED+
IDE_LED-
IDE_LED+
+IDE_LED
PWR
Ground
PWRSW
Chapter 1: Product introduction 1-25