HP 320 - Notebook PC Maintenance And Service Manual page 86

Compaq 320, 321, 420, 421, 620 and 621 notebook pcs hp 420 and 620 notebook pcs - maintenance and service guide
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3.
Remove the nine Torx M2.5×6.0 screws (1), three Phillips PM2.5×3.0 black broadhead screws
(2), and three Phillips PM2.0×3.0 screws (3).
4.
Turn the computer over so it is right-side up and remove four Torx M2.5×6.0 screws.
78
Chapter 4 Removal and replacement procedures

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