American Megatrends MAN-758 manual Connect CPU Fans, Install CPU, Pin 1 J1, J7, and J23 pinout

Step 5 Connect CPU Fans

J1 and J7 (shown below) are 3-pin bergs that connect the fan on the CPU heat sink to the motherboard power. J1 is the CPU fan connector for the CPU in CPU Slot1. J7 is the CPU fan connector for the CPU in CPU Slot2.

Ground

+12V

Fan Sense

Pin 1 J1, J7, and J23 pinout

All Pentium II CPUs are shipped with a heat sink and a CPU fan. The connector from the CPU fan usually has three leads (has red, yellow, and black leads). Connect the Red lead to Pin 3 (+12V). Make sure that you use fans that have 3 leads. The 3rd (yellow) lead should provide a tachometer output to permit the fan speed to be monitored by the onboard server management hardware. If you must use fans with only 2 leads, connect the red lead to Pin 3.

J23 Chassis Fan J23 is a 3-pin berg located near the VRM for the CPU 2 socket. The pinout is the same for J23 as it is for J1 and J7. J23 provides +12V power to the main chassis fan. The chassis fan should provide a tachometer output on Pin 3 so it can be monitored by the onboard server management hardware.

Step 6 Install CPU

The Pentium II CPUs are on Intel Slot1 adapter cards. Insert the Slot1 cards into the CPU card sockets on the motherboard. The CPU Slot1 sockets are below the SIMM sockets.

Warning

Improper CPU installation can damage the CPU and the motherboard. You must follow the procedures in this section exactly as documented. Make sure you wear an antistatic wristband while installing the CPU. Follow all antistatic procedures.

Chapter 1 Hardware Installation 11