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4. System panel connector (10-1 pin F_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 +HDLED)
This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable
to this connector. The HDD Activity LED lights up or ashes when data is read from or
written to the HDD.
• Power/Soft-off button (2-pin PWRBTN)
This 2-pin connector is for the system power button.
• 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.
M5A78L-M LX
PIN 1
PWRBTN
PLED+
PLED-
PWR
GND
IDE_LED+
IDE_LED-
Ground
Reset
F_PANEL
PLED
+HDLED RESET
M5A78L-M LX System panel connector
5. Speaker connector (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.
M5A78L-M LX
M5A78L-M LX Speaker out connector
+5V
GND
GND
Speaker Out
SPEAKER
PIN 1
Chapter 1: Product introduction1-24