1.10.2 Internal connectors Asus prime Asus M3A78

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6. 

System panel connector (20-8 pin F_PANEL)
This connector supports several chassis-mounted functions.

M3A78 System Panel Connector

R

M3A78

PANEL

PLED

-

+5

V

Speake

r

SPEAKER

PLED

Ground

Reset

Reset

Ground Ground

PLED

+

IDE_LED-

IDE_LED+

+IDE_LED

PW

R

Ground

PWRSW

• 

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 flashes when data is read from or written to 

the HDD.

• 

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.

• 

System warning speaker (2-pin SPEAKER) 

This 4-pin connector is for the chassis-mounted system warning speaker. The speaker 

allows you to hear system beeps and warnings.

7. 

Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) ports.

R

M3A78

M3A78 Digital Audio Connector

+5

V

SPDIFOU

T

GN
D

SPDIF_OUT

The S/PDIF module is purchased separately.

Chapter 1: Product introduction

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