Lenovo x3300 M4 7382 Installation And Service Manual page 289

c. Press firmly on the captive screws and tighten them with a screwdriver. The follow illustration shows
the sequence in tightening the screws, which is also shown on top of the heat sink. Begin with the
screw labeled as "1", then "2", "3" and finally "4". If possible, each screw should be rotated two full
rotations at a time. Repeat until the screws are tight. Do not overtighten the screws by using
excessive force. If you are using a torque wrench, tighten the screws to 8.5 Newton-meters (Nm) to
13 Nm (6.3 foot-pounds to 9.6 foot-pounds).
12. If you installed the second microprocessor, install the two fans on Fan connector 3 of the system board
respectively (see "Installing the fan assembly" on page 85).
13. Reinstall the memory module that you have removed (see "Installing a memory module" on page 45).
14. Reinstall the air baffle (see "Installing the air baffle" on page 87).
15. Reconnect any cables that you have disconnected from the adapters or system board.
16. If you are instructed to return the old microprocessor, follow all packaging instructions, and use any
packaging materials for shipping that are supplied to you.
If you have other devices to install or remove, do so now. Otherwise, go to "Completing the installation" on
page 85.
Thermal grease
The thermal grease must be replaced whenever the heat sink has been removed from the top of the
microprocessor and is going to be reused or when debris is found in the grease. Use this information to
replace damaged or contaminated thermal grease on the microprocessor and heat sink.
.
Chapter 6 Removing and replacing components
277