User`s manual

ASUS P5A-B User’s Manual 27

III. INSTALLATION

Connectors

III. INSTALLATION

5. CPU Cooling Fan Connectors (FAN, 3 pins)

This connector supports a 3-pin CPU cooling fan of 500mA (6W) or less with a

minimum of 3,500RPM. Depending on the fan manufacturer, the wiring and

plug may be different. The red wire should be Positive, the black should be

Ground, and the yellow wire should be Rotation signal.

WARNING! The CPU and/or motherboard will overheat if there is no airflow

across the CPU. 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.

P5A-B Power Supply, CPU, Chassis Fan Power

Power Supply Fan

Chassis Fan Power

CPU Fan Power

Ground

Rotation

+12 Volt

Ground

Rotation

+12 Volt

6. Chassis Intrusion Alarm Lead (4-1 pin CHASIS)

This requires an external detection mechanism such as a chassis intrusion moni-

tor/sensor or microswitch. The sensor is triggered when a high level signal is

sent to the CHASIS lead. This occurs when the side panel is opened or drive bay

doors are opened.

NOTE: When the chassis is opened, connect/short the Chassis Signal pin to the

+5VSB pin. When the chassis is closed, connect/short the Chassis Signal pin to

the Ground pin.

P5A-B Chassis Open Alarm Lead

+5Volt (Power Supply Stand By)

Ground

Chassis Signal