Asus TX97-E User Guide - Page 28
Chassis Open Alarm Lead CHASSIS, 4-1 pins
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R R III. INSTALLATION (Connectors) III. INSTALLATION 5. CPU Cooling Fan Connector (FAN, 3 pins) This connector supports a 3-pin CPU cooling fan of 500mAMP (6WATT) 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. Power Supply Fan Chassis Fan Power CPU Fan Power Rotation +12 Volt Ground 12Volt Chassis, CPU, Power Supply Fan Power 6. Chassis Open Alarm Lead (CHASSIS, 4-1 pins) This lead is for an open chassis monitor. A high level signal to the CHASSIS lead will indicate to the system that the chassis has been opened. Rotation +12 Volt Ground Chassis open alarm lead +5Volt (Power Supply Stand By) Chassis Signal Ground 28 ASUS TX97-E User's Manual