Asus M3A78 - Manual (Page 43)

ASUS M3A78 1-31
Ensure that the audio device of Sound playback is VIA High Definition Audio
(the name may be different based on the OS). Go to Start > Control Panel >
Sounds and Audio Devices > Sound Playback to configure the setting.
R
M3A78
M3A78 Digital Audio Connector
+5
V
SPDIFOU
T
GN
D
SPDIF_OUT
8. 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 replaced. The signal
is then generated as a chassis intrusion event.
By default, the pins labeled “Chassis Signal” and “GND” are shorted with
a jumper cap. Remove the jumper caps 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)