4.System panel connector (10-1 pin PANEL)

This connector supports several chassis-mounted functions.

F_PANEL

PWR_LEDPWR_BTN

A55BM-A/USB3

GND

PWR

PWR_LED-

PWR_LED+

PIN 1

HDD_LED+ HDD_LED- Ground HWRST# (NC)

+HDD_LED RESET

A55BM-A/USB3 System panel connector

•System power LED (2-pin PWR_LED)

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 HDD_LED)

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.

•ATX power button/soft-off button (2-pin PWR_BTN) 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.

5.Speaker connector (4-pin SPEAKER)

The 4-pin connector is for the chassis-mounted system warning speaker. The speaker allows you to hear system beeps and warnings.

A55BM-A/USB3

SPEAKER

+5V GND GND Speaker Out

PIN 1

A55BM-A/USB3 Speaker Out Connector

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Chapter 1: Product introduction