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ASUS P3B-F User’s Manual 33
3. HARDWARE SETUP
Connectors
3. H/W SETUP
9) 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.
R
P3B-F
P3B-F 12Volt Cooling Fan Power
Power Supply Fan
Chassis Fan Power
CPU Fan Power
GND
+12V
Rotation
GND
+12V
Rotation
GND
+12V
Rotation
8) IDE Device Activity LED (2-pin IDELED)
This connector supplies power to the cabinet’s IDE device activity LED. Read
and write activity by devices connected to the Primary or Secondary IDE con-
nectors will cause the LED to light up.
R
P3B-F
P3B-F IDE Activity LED
TIP: If the case-mounted LED does not light,
try reversing the 2-pin plug.
IDELED