and later [Release: N/A and later ]
Information in this document applies to any platform.
Goal
How to Remove and Replace a Ultra 24 Workstation Heatsink and CPU
Solution
DISPATCH INSTRUCTIONS
- WHAT SKILLS DOES THE ENGINEER NEED: Only by trained field service technicians.
- TIME ESTIMATE: 90 minutes
- TASK COMPLEXITY:3
FIELD ENGINEER INSTRUCTIONS:
- PROBLEM OVERVIEW:How to Remove and Replace a Ultra 24 Workstation Heatsink and CPU
- WHAT STATE SHOULD THE SYSTEM BE IN TO BE READY TO PERFORM THE
RESOLUTION ACTIVITY?:
- WHAT ACTION DOES THE ENGINEER NEED TO TAKE:
Required Tools:
* A long blade Phillips screwdriver (minimum 4-5 inches)
* Antistatic wrist strap and mat
Note - Before removing the CPU from the motherboard, create a backup file to preserve all important data.
1. Powering Off the System and Removing the Left-Side Access Panel.
I. Power off the system and all the peripherals connected to it.
II. Turn the power switch on the back of the chassis to the Off position.
Caution - Failure to properly turn off the system before you start installing components can cause serious component damage.
III. To maintain system grounding, do not unplug the AC power cord from the back of the system unless the specific procedure instructs you to unplug it.
IV. Loosen the two captive thumbscrews located on the rear edge of the left side access panel
V. Slide the access panel approximately 1.5 cm toward the back of the workstation.
VI. Tilt the top edge of the panel out, then lift the panel upward.
VII. Carefully set the panel aside.
Remove the Heatsink and CPU
Caution - Parts of the heatsink assembly might be extremely hot. To prevent accidental burns or damage to the heatsink, always handle the heatsink by the black plastic mounting bracket. Allow the heatsink to cool for a few minutes before attempting this procedure.
1. Gently lay the system on its right side on a stable, nonslip surface.
2. Disconnect the heatsink's CPU fan cable from its connector on the motherboard.
The CPU fan connector is labeled CPU_FAN.
3. Remove the heatsink assembly by alternately loosening (2-3 turns) the four screws that secure the assembly to the motherboard.
Continue to alternately loosen each screw until the heatsink assembly is no longer secured to the motherboard. The heatsink assembly is also mounted to the top surface of the CPU by a layer of
thermal grease, which acts as an adhesive.
5. Grasp the heatsink by its plastic mounting bracket and, while gently pulling upward, slowly wiggle the assembly back and forth to break the adhesive seal of the thermal grease.
6. Remove the heatsink-fan assembly from the chassis (see). Reference page 80 of the Sun Ultra 24 Workstation Service Manual.
7. Place the heatsink on its side and on a flat surface to prevent the thermal grease from contaminating other components.
You can see the CPU.
8. Depress the CPU socket retainer lever and slightly pull the lever outward (away from the CPU) to free the lever from its retaining clip.
9. When you have released the lever from the retaining clip, lift the lever to its fully open (upright) position.
This action releases the pressure on the hinged CPU socket retainer.
10. Lift the unhinged side of the CPU socket retainer to its fully open (upright) position.
This action exposes the CPU. The CPU is mounted to a PCB that is keyed (notched) on two opposite sides.
The heatsink assembly is also mounted to the top surface of the CPU by a layer of thermal grease, which acts as an adhesive.
11. Grasp the notched edges of the CPU PCB and lift it out of the socket.
Set the CPU on an antistatic mat or surface.
12. To install the heatsink and CPU, use the procedure shown in To Install a Heatsink and CPU.
Install a Heatsink and CPU
Note - Observe the ESD precautions and preinstallation procedures described in Electrostatic Discharge (ESD) Precautions.
1. Ensure that the CPU socket retainer lever and hinged socket retainer are in the fully open (upright) position
2. Remove the new CPU from its antistatic packaging.
The CPU is mounted on a PCB that is notched on two opposite sides.
3. Hold the CPU by its notched sides.
4. Position the CPU over the CPU socket so that the notches on the PCB align with the keys on the socket.
5. Carefully set the CPU onto the socket.
When correctly positioned the CPU lies flat in the socket, and the notches on the CPU are aligned with the keys on the socket, restricting movement of the CPU within the socket.
Caution - Irreparable damage to the motherboard can occur if downward force is applied to the socket. Do not attempt to force the CPU into the socket to seat it.
6. When the CPU is positioned in the socket, lower the hinged socket retainer to cover the CPU.
7. Lower the socket retainer lever, pressing it downward securing it under the lever retaining clip.
8. Do this step only if you are installing a new CPU. Otherwise, go to Step 9.
a. Clean any contamination from the top of surface of the CPU, using the supplied alcohol wipe.
The heatsink assembly already has thermal grease applied. You do not need to apply additional thermal grease.
b. Remove the plastic cover from the heatsink-fan assembly.
9. Do this step if you are installing an already-used CPU onto a new motherboard. Otherwise, go to Step 10.
a. Remove the grease from the CPU and the heatsink using the supplied alcohol wipe.
b. Use the supplied syringe to apply approximately 0.5 ml of thermal grease to the center of the top of the CPU.
Empty the entire syringe onto the chip.
c. Using the wrapper of the alcohol wipe or the clean edge of a plastic bag, spread the thermal grease until it covers the top of the CPU in a thin, uniform layer.
Caution - Do not use an unprotected finger to spread the thermal grease. The oil on your finger will degrade the performance of the thermal grease.
10. Inspect the heatsink-fan assembly for dust and lint. Clean if necessary.
11. Carefully position the heatsink-fan assembly over the CPU, aligning the screws with the holes in the motherboard.
12. Lower the heatsink-fan assembly onto the top of the CPU, avoiding any side-to-side movement.
Caution - If you move the heatsink assembly too much during installation, the layer of thermal grease might not be distributed evenly, leading to component damage.
13. Press down slightly on the top of the heatsink-fan assembly while alternately tightening (3-5 turns) each of the four screws.
Continue doing this until the heatsink-fan assembly is secured to the motherboard and you can no longer tighten the screws.
Caution - Irreparable damage can occur to the motherboard if you attempt to overtighten the heatsink-fan assembly screws.
14. Connect the CPU fan cable to the connector on the motherboard.
15. Return the system to the upright position.
OBTAIN CUSTOMER ACCEPTANCE
- WHAT ACTION DOES THE CUSTOMER NEED TO TAKE TO RETURN THE SYSTEM TO
AN OPERATIONAL STATE:Nothing beyond basic hardware and Solaris training
PARTS NOTE:
REFERENCE INFORMATION:
Sun Ultra 24 Workstation Service Manual
http://download.oracle.com/docs/cd/E19127-01/ultra24.ws/820-2480-12/
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