IBM System x3950 Type 8878 Service Manual page 73

Microprocessor
Microprocessor
connector
3. Close the microprocessor-release lever to secure the microprocessor.
4. Make sure that the heat-sink retaining clip is open.
5. If you are installing a new heat sink, remove the cover from the bottom of the
heat sink. If you are reinstalling a heat sink that was previously removed, go to
"Thermal grease" on page 58 for instructions on replacing the contaminated or
missing thermal grease; then, return here and continue step 6.
6. If necessary, remove the cover from the bottom of the heat sink.
7. Position the heat sink above the microprocessor, making sure that the word
"Front" is closest to the front of the server; then, press the heat sink into place
and close the heat-sink release lever.
Note: If you are installing an additional microprocessor in microprocessor
socket 3 or 4, you must also install a VRM.
8. If necessary, install a VRM in the connector.
a. Open the retaining clips on each end of the VRM connector.
b. Turn the VRM so the keys align with the slot.
c. Insert the VRM into the connector by aligning the edges of the VRM with
the slots at the end of the VRM connector. Firmly press the VRM straight
down into the connector by applying pressure on both ends of the VRM
simultaneously. The retaining clips snap into the locked position when the
VRM is seated in the connector.
9. Install the air baffle in the microprocessor tray.
10. Install the microprocessor tray in the server:
a. Make sure that the microprocessor-tray release latch is open; then, push
the microprocessor tray into the server.
b. Close the tray levers and make sure they are securely latched.
c. Close the microprocessor-tray release latch.
d. Reinstall the fans and memory cards in the server.
11. Install the top cover and bezel (see "Top cover and bezel" on page 45).
12. Slide the server into the rack.
13. Connect the cables and power cords (see "Connecting the cables" on page 34
for cabling instructions).
14. Turn on all attached devices and the server.
Microprocessor
orientation indicator
Microprocessor-
release lever
Chapter 4. Removing and replacing server components
57