Lenovo System x3750 M4 Installation And Service Manual page 305

d. Lower the heat sink and press down firmly on the heat sink.
e. Align the captive screws on the heat sink with the holes on the heat-sink retention module.
f. Press down on the center of the heat sink; then, press firmly on the captive screws and tighten them,
alternating between the screws in a figure-8 pattern as illustrated on the heat sink label until they
are tightened. You can cause damage to the microprocessor if you tighten the screws on one
side first, rather than rotating. Rotate each screw one full rotation at a time. Repeat this process
until the screws are tightened.
4. If you removed the microprocessor air baffle, reinstall it (see "Replacing the microprocessor air baffle"
on page 219).
Note: A microprocessor air baffle must be installed whenever the DIMM connectors closest to the
microprocessor (on the left and the right) are empty. For example, when DIMM connectors 6 and 7 are
empty on the system board, the microprocessor air baffle must be installed on microprocessor 1. This
is applicable for all microprocessors.
5. Reinstall the microprocessor and memory expansion tray, if one was removed (see "Replacing the
microprocessor and memory expansion tray assembly" on page 293).
6. Reinstall the DIMM air baffle, if one was removed (see "Replacing the DIMM air baffle" on page 221).
7. Reconnect any cables that you disconnected from the adapters or system board.
8. Reinstall the server cover (see "Replacing the server top cover" on page 216).
9. Slide the server into the rack.
10. Reconnect the power cords and any cables that you removed.
11. Turn on the peripheral devices and the server.
Thermal grease
Use this information to determine the guidelines for using thermal grease on a heat sink and microprocessor.
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.
When you are installing the heat sink on the same microprocessor that is was removed from, make sure
that the following requirements are met:
• The thermal grease on the heat sink and microprocessor is not contaminated.
• Additional thermal grease is not added to the existing thermal grease on the heat sink and microprocessor.
Notes:
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Chapter 6 Removing and replacing components
291