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ASUS P3B-1394 User’s Manual 33
3. HARDWARE SETUP
Connectors
3. H/W SETUP
11) Chassis,Power Supply,CPU Fan Connectors (3-pin CHA_,PWR_,CPU_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 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 monitored using ASUS PC Probe Utility or Intel LDCM Utility (see 6.
Software Reference).
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.
P3B-1394
®
P3B-1394 12Volt Cooling Fan Power
Chassis Fan Power (CHA_FAN)
Power Supply Fan (PWR_FAN)
CPU Fan Power (CPU_FAN)
GND
Rotation
+12V
GND
Rotation
+12V
GND
Rotation
+12V