Mainboard PI852
11
Front Panel Headers: FPSWLED1, SPK1
FPSWLED1
Pin
Assignment
Function
Pin
Assignment
Function
1 N/C
9
Power LED (-)
2 N/C
10
Power LED (+)
Power LED
(ACPI_LED)
3 N/C
11
Reset Control (-)
4 Key
12
Reset Control (+)
Reset Switch
(RESET)
5
Power Button (-)
13
Ground
6
Power Button (+)
Power-on Button
(PWR_BTN)
14
N/C
7
HDD LED (-)
8
HDD LED (+)
Hard Drive LED
(HD_LED)
Power-on Switch Header: PWR_BTN
This header can be attached to a power switch cable on your case front panel. You can turn your
system on or off by pressing the button attached to this power switch cable.
Hard Drive LED Header: HD_LED
If your case front panel has a hard drive LED cable, attach it to this header. The LED will flicker when
there is hard disk drive activity.
Power LED Header: ACPI_LED
These mainboards provide a 2-pin power LED header. If there is a 2-pin power LED cord on your case
front panel, you can attach it to the 2-pin power LED header. Then the power LED will illuminate while
the system is powered on.
Reset Switch Header: RESET
This header can be attached to a momentary SPST switch (reset button) cable on your case front
panel. The switch is normally left open. When the switch closed, it will cause the mainboard to reset
and run the POST (Power-On Self Test).
Speaker Header: SPK1
A speaker cable on your case front panel can be attached to this header. When you reboot the
computer, this speaker will issue a short audible (beep). If there are problems during the Power On
Self-Test, the system will issue an irregular pattern of audible beeps through this speaker.
Pin
Assignment
Pin
Assignment
1 PC_BEEP 2 N/A
SPK1
3 Ground
4 +5V
