You can replace a CPU and heatsink in a Sun Blade X8400 Server Module (blade) that has been powered-off and removed from its chassis.
These components are a field-replaceable units (FRUs). They should be replaced only by qualified Sun service technicians.
This topic includes the following sections:
Preparing to Replace a CPU and Heatsink
Replacing a CPU and Heatsink
Finishing the CPU and Heatsink Replacement
Prepare the blade for removal.
Remove the blade from the chassis.
See Replace Blade.
Remove the blade cover.
See Remove Blade Cover.
Wear a properly grounded antistatic wrist strap.
Locate the CPU and heatsink you are replacing.
Use a 9/64 Allen wrench to loosen the two spring-loaded mounting screws that secure the heatsink to the motherboard. Hold down on the top of the heatsink to prevent it from tipping unevenly while you alternately loosen the mounting screws. Turn each screw one-half turn (180 degrees) at a time, then remove the two screws and two springs when they are detached.
Twist the heatsink slightly to reduce the adhesive and surface tension properties between the heatsink and CPU. Then lift the heatsink off of the board. Turn the heatsink upside down and allow the two washers in each of the two mounting holes to fall out into your hand.
Pull the CPU socket lever slightly away from the socket.
Pivot the lever up, into the fully vertical, open position.
Lift the CPU out of the socket, leaving the lever in the vertical, open position.
Unpack the new CPU and heatsink (if a new heatsink was ordered).
Ensure that the CPU socket release lever is in the fully open, vertical position.
Align the CPU in the socket.
Gently insert the CPU pins into the socket.
When the CPU is fully seated in the socket, pivot the release lever down and into the locked position, at the side of the socket.
Complete either of the following two steps, depending on whether you are reinstalling an existing heatsink or are installing a new heatsink.
If you are reinstalling an existing CPU or heatsink, remove any heavy amounts of thermal grease with a tissue. Then use an alcohol pad to clean all old thermal grease from the component surfaces. Continue with Step 13.
If you are installing a new heatsink, the heatsink will have preapplied thermal grease that is protected with a plastic cover. Remove the plastic cover. Do not apply any more thermal grease to the heatsink. Go to Step 14.
Use one syringe of thermal grease (1 ml) to carefully apply grease to the top of the CPU in two lines that make an X pattern and a third line placed horizontally across the mid section of the X.
Turn the heatsink upright and reinstall the two washers, two springs, and mounting bolts.
Carefully position and align the heatsink over the CPU.
Lower the heatsink onto the CPU, aligning the mounting bolts with their holes on the motherboard.
Alternately tighten the two heatsink mounting screws one-half turn (180 degrees) at a time until each spring is compressed and the screw bottoms out on the mating surface. Hand tighten–do not force–the screws approximately 8 in/ounce.
Reinstall the blade cover.
See the installation instructions in Remove Blade Cover.
Insert the blade into the chassis.
See the installation instructions in Replace Blade.