Service Reference Guide

Service Reference Guide 12–3
Removal and Replacement Procedures System Board with Major Components
Heatsink Cool-Down Time
The heat generated from the processor core transfers to the heatsink, making the assembly too
hot to handle. After transitioning from a power-on state to a power-off state (assuming the system
has been on for a while), the heatsink takes about 13 minutes to cool sufficiently so that it can be
handled comfortably while the bonding compound is still pliable enough to break.
Heatsink Warm-Up Time
A shut-down (cold) system requires minimal warm-up time to bring the heatsink-processor
assembly to the temperature necessary to make the bonding compound pliable enough to safely
break.
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CAUTION: Lifting the heatsink straight up while it is cold can result in pulling the processor out of the
processor socket, resulting in possible damage to the processor and/or socket. If no socket damage has
occurred, remember to open the socket by raising the retention lever before installing the new processor.
To warm up the heatsink/processor assembly:
1. Turn on the workstation and allow the operating system to boot and the “desktop” to appear.
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The system requires approximately four to eight minutes of running time for the primary
heatsink/processor assembly to reach the temperature required for loosening the bond between
the heatsink and processor. A secondary heatsink/processor assembly (if present) requires about
12 minutes of running time to reach the necessary temperature for separation.
2. Shut down the operating system normally, allowing the software to turn off the system
hardware. If necessary, turn off the system manually.