HP (Hewlett-Packard) NX9500 ユーザーズマニュアル

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Maintenance and Service Guide
Removal and Replacement Procedures
5.13 RTC Battery
The RTC battery is included in the Miscellaneous Plastics Kit, 
spare part number 344852-001 or 370805-001.
remove the following components:
Optical drive (
Keyboard cover (
Top cover (
System board (
2. Turn the system board upside down with the rear panel 
toward you.
3. Remove the RTC battery from the socket.
Removing the RTC Battery
Reverse the above procedure to install the RTC battery.