HP Pavilion DV7-4280 Maintenance And Service Manual page 78

3. Remove the following screws:
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3 Phillips 2.5×2.0 screws (in the optical drive bay)
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2 Phillips 2.5×1.5 screws (in secondary hard drive bay)
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3 Phillips 2.5×6.5 screws (battery bay)
4. Turn the computer display-side up, with the front toward you.
5. Open the computer as far as possible.
68 Chapter 4 Removal and replacement procedures