Dell Latitude E5420 (Early 2011) - Manual (Page 110)

12. Replace the wireless wide area network (WWAN) .
13. Replace the hard drive.
14. Replace the optical drive.
15. Replace the keyboard .
16. Replace the keyboard trim .
17. Replace the memory.
18. Replace the back panel.
19. Replace the secure digital (SD) card .
20. Replace the subscriber identity module (SIM) card .
21. Replace the battery.
22. Follow the procedures in After Working Inside Your Computer .
Related Links
Removing the Coin-Cell Battery
110