1.10.2 Internal connectors Asus prime Asus M3A78

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11.  Chassis intrusion connector (4-1 pin Chassis)

This connector is for a chassis-mounted intrusion detection sensor or switch. Connect 

one end of the chassis intrusion sensor or switch cable to this connector. The chassis 

intrusion sensor or switch sends a high-level signal to this connector when a chassis 

component is removed or replace. The signal is then generated as a chassis intrusion 

event. 

By default, the pin labelled “Chassis Signal” and “Ground” are shorted with a jumper 

cap. Remove the jumper cap only when you intend to use the chassis intrusion 

detection feature. 

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M3A78

M3A78 Chassis intrusion connector

CHASSIS

+5VSB_MB

Chassis Signal GN

D

(Default)

•  We recommend that you connect a high-definition front panel audio module to this 

connector to avail of the motherboard high-definition audio capability.

•  By default, this connector is set to [HD Audio]. If you want to connect a High Definition 

front panel audio module to this connector, set the Front Panel Select item in the BIOS 

to [HD Audio]. See section “2.4.3 Chipset” for details.

10.  Front panel audio connector (10-1 pin AAFP)

This connector is for a chassis-mounted front panel audio I/O module that supports 

either High Definition Audio or AC`97 audio standard. Connect one end of the front 

panel audio I/O module cable to this connector.

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M3A78

M3A78 Azalia Analog Front Panel Connector

HP_HD

MIC2_L

HP_R

HP_L

MIC2_J

D

Jack_Sense

MIC2_R

PRESENSE#

AGND

AAFP

Legacy AC’97-compliant

pin definition

NC

MIC2_L

Line out_R

Line out_L

NC

NC

MIC2_R

NC

AGND

Azalia-compliant

pin definition

Chapter 1: Product introduction

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