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ASUS PSCH-SR motherboard
2-31
15. System panel connector (20-1 pin PANEL)
This connector accommodates several system front panel functions.
• System Power LED (3-pin PLED)
This connector is for the system power LED. The LED lights up when
you turn on the system power, and blinks when the system is in sleep
mode.
• Message LED (2-pin MLED)
This connector is for the front panel message LED that indicates the
booting status. The LED blinks when the system is in the boot process
until the operating system is loaded.
• System Warning Speaker (4-pin SPKR)
This connector is for the case-mounted speaker and allows you to hear
system beeps and warnings.
• Hard Disk Activity (2-pin HD_LED)
This connects to the hard disk drive LED. The read or write activities of
the hard disk drive connected to the any of IDE connectors cause the
hard disk drive LED to light up.
• ATX Power Switch/Soft-Off Switch (2-pin PWR_SW)
This connector is for the system power switch. Pressing the power
switch turns the system between ON and SLEEP, or ON and SOFT
OFF, depending on the BIOS or OS settings. Pressing the power
switch for more than 4 seconds when the system is on turns the
system off.
• Reset Switch (2-pin RESET)
This connector is for the case-mounted reset switch for rebooting the
system without turning off the system power.
PSCH-SR
®
PSCH-SR System Panel Connector
PANEL1
MLED-GND
NCPOWERBTN#
+5VGND
GNDNC
POWERLED+HDLED+
NCHDLED-
POWERLED-
MLED+NMIBTN#
GNDRESETBTN#
SPKROUTGND