Dell Vostro 3550 (Early 2011) - Manual (Page 67)

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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 memory card .
4. Remove the ExpressCard .
5. Remove the access panel .
6. Remove the memory module .
7. Remove the optical drive .
8. Remove the hard drive .
9. Remove the WWAN card .
10. Remove the keyboard .
11. Remove the palm rest .
12. Remove the WLAN card .
13. Remove the hold switch .
14. Remove the ExpressCard board .
15. Remove the display assembly .
16. Remove the system board .
17. Rotate the processor cam lock in a counter-clockwise direction.
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