8. Reinstall the fan cage assembly (see “Replacing the fan cage assembly” on
page 246).
9. Reinstall the drives and filler panels.
10. Install the cover (see “Replacing the server top cover” on page 207).
11. Slide the server in the rack.
12. Reconnect the power cord and any cables that you removed.
13. Turn on the peripheral devices and the server.
Removing and replacing FRUs
FRUs must be replaced or installed only by trained service technicians.
The illustrations in this document might differ slightly from the hardware.
Removing a microprocessor and heat sink
Attention:
v Be extremely careful, the microprocessor socket contacts are very fragile.
v Do not allow the thermal grease on the microprocessor and heat sink to come in
contact with anything. Contact with any surface can compromise the thermal
grease and the microprocessor socket.
v Do not touch the microprocessor contacts. Contaminants on the microprocessor
contacts, such as oil from your skin, can cause connection failures between the
contacts and the socket.
v Use the microprocessor installation tool that came with the new microprocessor
to remove and install the microprocessor.
To remove a microprocessor and heat sink, complete the following steps:
Note: This procedure for removing a microprocessor and heat sink also apply
when removing a microprocessor and heat sink from the microprocessor and
memory expansion tray.
1. Read the safety information that begins on page “Safety” on page vii and
“Installation guidelines” on page 33.
2. Turn off the server (see “Turning off the server” on page 21) and all attached
peripheral devices. Disconnect all power cords; then, disconnect all external
cables as necessary to replace the device.
3. Remove the server cover (see “Removing the server top cover” on page 206).
4. Disconnect any cables that impede access to the heat sink and microprocessor.
5. If you are replacing a microprocessor on the system board, remove the
microprocessor and memory expansion tray (see “Removing the
microprocessor and memory expansion tray assembly” on page 278).
6. Remove the DIMM air baffle, if one is installed (see “Removing the DIMM air
baffle” on page 210).
7. Remove the microprocessor air baffle, if one is installed (see “Removing the
microprocessor air baffle” on page 209).
8. Remove the heat sinks:
a. Use a screwdriver to loosen the captive screw on one side of the heat sink
to break the seal with the microprocessor.
b. Loosen all the captive screws on the heat sink, rotating each screw one full
turn until each screw is loose.
272 System x3750 M4 Types 8722 and 8733: Installation and Service Guide
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