Nvidia nForce 550 MCP User Manual page 22

(8) Power switch: PWR BTN
This 2-pin connector connects to the case-mounted power switch to power ON/OFF the
system.
(9) FAN Headers (3-pin) : CHAFAN, SYSFAN1, SYSFAN2，CPUFAN
These connectors support cooling fans of 350mA (4.2 Watts) or less, depending on the
fan manufacturer, the wire 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 connector.
(10) IR infrared module Headers (5-pin) : IR
This connector supports the optional wireless transmitting and receiving infrared
module. You must configure the setting through the BIOS setup to use the IR function.
PWRLED
Pin 1
JW FP
SPEAK
Pin 1 Pin 1
System Case Connections
C P U FAN
1
3 1
SFA N2
3
S FAN 1
C H AF AN
i24
3
1
1
3
IR
2 6
Pin 1 5
IR infrared module Headers