3. HARDWARE SETUP 14) IC Power Supply (IC_PWR_FAN), CPU (CPU_FAN), Chassis (CHA_FAN) Fan Connectors (3 pins) These connectors support cooling fans of 350mA (4.2 Watts) 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 consid- eration the polarity of the connector. NOTE: The “Rotation” signal is to be used only by a specially designed fan with rotation signal.
The Rotations per Minute (RPM) can be read directly from the ASUS iPanel or monitored using a utility such as ASUS PC Probe or Intel LDCM. 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. 3. H/W SETUP Connectors Rotation +12V GND IC_PWR_FAN GND Rotation +12V CPU_FAN Rotation +12V CHA_FAN GND CUA 12-Volt Cooling Fan Power 15) Chassis Intrusion Lead (4-pin CHASSIS) 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 Chassis Signal lead, which occurs when a panel switch or light detec- tor is triggered. This function requires the optional ASUS CIDB chassis intru- sion module to be installed (see 7. APPENDIX ). If the chassis intrusion lead is not used, a jumper cap must be placed over the pins to close the circuit. CHASSIS 1 Ground Chassis Signal +5Volt (Power Supply Stand By) CUA ® CUA Chassis Open Alarm Lead 37 ASUS CUA User’s Manual ® CUA