IBM 88371RU Maintenance And Troubleshooting Manual page 48

Microprocessor
connector
Figure 29. Microprocessor installation
38
xSeries 336 Type 1879 and Type 8837: Hardware Maintenance Manual and Troubleshooting Guide
Microprocessor
7. Close the microprocessor-release lever to secure the microprocessor.
Attention:
v Do not set the heat sink down after you remove the plastic cover.
v Do not touch or contaminate the thermal grease on the bottom of the new
heat sink. Doing so damages its heat-conducting capability and exposes the
new microprocessor to overheating.
v If you must remove the heat sink after installing it, note that the thermal
grease might have formed a strong bond between the heat sink and the
microprocessor. Do not force the heat sink and microprocessor apart; doing
so can damage the microprocessor pins. Loosen one captive screw fully
before loosening the other captive screw to help break the bond between
the components without damaging them.
8. Remove the cover from the bottom of the heat sink and make sure that the
thermal grease is still on the bottom of the heat sink.
9. Install the heat sink on top of the microprocessor, and tighten the captive
screws. Alternate between the screws until they are tight, making sure that you
do not overtighten them.
Microprocessor
orientation indicator
Microprocessor-
release lever