Asus P2B-L, P2B-LS, P2B-S NOTE:, ASUS P2B-L/P2B-S/P2B-LSUser’s Manual, do not place jumper caps over these pins, 21.Chassis Open Alarm Lead (4-1pin CHASSIS)

III.INSTALLATION

21.Chassis Open Alarm Lead (4-1 pin CHASSIS)

This lead can be used as an open chassis monitor. A high level signal to the CHASSIS lead will indicate to the system that the chassis has been opened. This function is available with the hardware monitor installed.

CHASSIS

+5VSB

CHASSIS

GND

P2B-L/S/LS Chassis Open Alarm Lead

22.Chassis/CPU/Power Supply Fan Connectors (3-pin FAN)

These connectors support cooling fans of 500mA (6W) or less. Orientate the fans so that the heat sink fins allow airflow to go across the onboard heat sink(s) instead of the expansion slots. Depending on the fan manufacturer, the wiring and plug may be different. The red wire should be positive, while the black should be ground. Connect the fan’s plug to the board taking into consideration the polarity of the this connector.

NOTE: The “Rotation” signal is to be used only with a specially designed fan with rotation signal.

WARNING! The CPU and/or motherboard will overheat if there is no airflow across the CPU and onboard heatsinks. Damage may occur to the motherboard and/or the CPU fan if these pins are incorrectly used. These are not jumpers,

do not place jumper caps over these pins.

Power Supply Fan Power

CPU Fan Power

Chassis Fan Power

Rotation

+12V

Ground

INSTALLATION	Connectors
III.

P2B-L/S/LS 12Volt Cooling Fan Power

ASUS P2B-L/P2B-S/P2B-LS User’s Manual 33