Asus PRIME B350M-A/CSM User Guide - Page 12

7. Clear RTC RAM (2-pin CLRTC) This header allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords. To erase the RTC RAM: 1. Turn OFF the computer and unplug the power cord. 2. Use a metal object such as a screwdriver to short the two pins. 3. Plug the power cord and turn ON the computer. 4. Hold down the key during the boot process and enter BIOS setup to re-enter data. +3V_BAT GND CLRTC PIN 1 If the steps above do not help, remove the onboard battery and short the two pins again to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery. 8. System panel connector (10-15 pin PANEL) This connector 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 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. PIN 1 • Hard disk drive activity LED (2-pin HDD_LED) HDD_LED+ HDD_LED- Ground HWRST# (NC) This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable to this connector. The HDD LED lights up or flashes when data is read from or written to the HDD. +HDD_LED RESET • ATX power button/soft-off button (2-pin PWR_BTN) This 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. 9. Speaker connector (4-pin SPEAKER) The 4-pin connector is for the chassis-mounted system warning speaker. The speaker allows you hear system beeps and warnings. SPEAKER +5V GND GND Speaker Out PIN 1 1-4 Chapter 1: Product introduction