IBM 393, 387, 391, 389, 388, 441, 390, 392 manual Replacing the microprocessor, What to do next

10.Install the four screws to secure the new heat sink and fan assembly on the system board. It is recommended that you carefully install the four screws using the following method to avoid any possible damage to the system board.

a.Partially tighten screw 1 , then firmly tighten screw it. Do not over-tighten the screws.

b.Partially tighten screw 2 , then firmly tighten screw it. Do not over-tighten the screws.

3 , and then return to screw

4 , and then return to screw

1

2

and firmly tighten

and firmly tighten

Figure 91. Installing the screws to secure the heat sink and fan assembly

11.Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “System board components” on page 42.

Note: If the heat sink and fan assembly cable is too long, loosely knot the cable for proper cable routing.

12.If you are instructed to return the old heat sink and fan assembly, follow all packaging instructions and use any packaging materials that are supplied to you for shipping.

What to do next:

•To work with another piece of hardware, go to the appropriate section.

•To complete the replacement, go to “Completing the parts replacement” on page 162.

Replacing the microprocessor

Attention: Do not open your server or attempt any repair before reading and understanding the “Safety information” on page iii and “Guidelines” on page 83.

This topic provides instructions on how to replace the microprocessor.

Chapter 6. Installing, removing, or replacing hardware 157