Asus EX-B660M-V5 PRO D4 Users Manual English - Page 12

+5V GND GND Speaker Out 12. Speaker header The 4-pin header is for the chassis-mounted system warning speaker. The speaker allows you to hear system beeps and warnings. SPEAKER PIN 1 13. 10-1 pin System Panel header This header supports several chassis-mounted functions. • System power LED (2-pin +PWR_LED-) F_PANEL +PWR_LED- PWR_BTN PWR_LED+ PWR_LEDPWR GND This 2-pin header is for the system power LED. Connect the chassis power LED cable to this header. The system power LED lights up when you turn on the system power, and blinks when the system is in sleep mode. PIN 1 • Hard disk drive activity LED (2-pin +HDD_LED-) HDD_LED+ HDD_LED- Ground HWRST# (NC) This 2-pin header is for the HDD Activity LED. Connect the HDD Activity LED cable to this header. The HDD LED lights up or flashes when data is read from or written to the HDD. +HDD_LED- RESET • Power button/Soft-off button (2-pin PWR_BTN) This header is for the system power button. • Reset button (2-pin RESET) This 2-pin header is for the chassis-mounted reset button for system reboot without turning off the system power. 1-4 Chapter 1: Product Introduction