Dell Vostro 1540 (Mid 2011) - Manual (Page 41)

Removing The Processor
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1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the keyboard .
4. Remove the palm rest .
5. Remove the CPU fan assembly and the heatsink .
6. Rotate the processor-cam screw in a counter-clockwise direction.
7. Lift up the processor and remove it from the computer.
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