Acer M3900 manual Jumper Setting, Setting Jumper, Internal header pin definition

Jumper Setting

The section explains how to set jumper for correct configuration of the mainboard.

Setting Jumper

Use the motherboard jumpers to set system configuration options. Jumpers with more Than one pin are numbered. When setting the jumpers, ensure that the jumper caps are Placed on the correct pins.

Jumper	Type	Description	Setting (default)	Picture
CLR_CMOS	3-pin	CLEAR CMOS	1-2: NORMAL
			2-3: CLEAR
			Before clearing the CMOS, make sure
			to turn the system off.

Internal header pin definition

Header Name	Function	Definition
	CPU FAN HEADER	1: GND
		2: +12V
		3: SENSE
	SYS FAN HEADER	1: GND
	(3pin & 4 pin colay	2: +12V
	default:3 pin)	3: SENSE
		4: PWM CONTROL(4 pin
		Fan)
	FRONT PANEL HEADER	1: SATALED+
		2: ACPI_LED
		3: SATALED-
		4: PWR_LED
		5: GND
		6: PWR_SW
		7: RESET
		8: GND
		9: NC
		10: Key
		11: NC
		12: VCC
		13: NC
		14: -ACTIVE_C

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