HP 6520s - Notebook PC Maintenance And Service Manual page 56

Remove the switch cover and keyboard:
Remove the following screws:
1.
(1) Two Torx T8M2.5×7.0 screws
(2) Three Torx T8M2.5×3.0 broad-head screws
Remove the two Torx T8M2.5×7.0 screws that secure the keyboard to the computer.
2.
Turn the computer display-side up, with the front toward you.
3.
Open the computer as far as possible.
4.
48 Chapter 4 Removal and replacement procedures