Dell Latitude E5420 (Early 2011) - Manual (Page 45)

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Processor
Removing the Processor
1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the back panel .
4. Remove the CPU door .
5. Remove the heat sink .
6. Rotate the processor-cam screw in counter-clockwise direction.
7. Remove the processor.
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Installing the Processor
Installing the Processor
1. Insert the processor into the processor socket.
2. Replace the heat sink .
3. Replace the CPU door .
4. Replace the back panel .
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