HP (Hewlett-Packard) Compaq Tablet PC ユーザーズマニュアル

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Removal and Replacement Procedures
Maintenance and Service Guide
6–19
4. Turn the tablet PC right-side up with the front toward you.
5. Open the tablet PC as far as possible.
6. Lift up the front edges of the keyboard cover until the cover 
disengages from the tablet PC.
Releasing the Keyboard Cover