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 231).
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 307).
6. Reinstall the DIMM air baffle, if one was removed (see “Replacing the DIMM
air baffle” on page 233).
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 227).
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:
This information provides instructions on how to replace thermal grease when
working with the microprocessors and heat sinks.
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:
v The thermal grease on the heat sink and microprocessor is not contaminated.
v Additional thermal grease is not added to the existing thermal grease on the
heat sink and microprocessor.
Note:
v Read the Safety information on page “Safety” on page vii.
v Read the “Installation guidelines” on page 35.
v Read “Handling static-sensitive devices” on page 37.
To replace damaged or contaminated thermal grease on the microprocessor and
heat sink, complete the following steps:
1. Place the heat sink on a clean work surface.
2. Remove the cleaning pad from its package and unfold it completely.
3. Use the cleaning pad to wipe the thermal grease from the bottom of the heat
sink.
304 System x3750 M4 Types 8722 and 8733: Installation and Service Guide
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