Hard Drive/Optical Drive Access Indicator - Fujitsu LIFEBOOK AH752 Mode D'emploi

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Batteries subjected to shocks, vibration or extreme temperatures can be permanently
damaged.
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A shorted battery is damaged and must be replaced.

Hard Drive/Optical Drive Access Indicator

The Hard Drive/Optical Drive Access indicator glows green when your internal hard drive is being
accessed. Note that flickering is normal.
NumLk Indicator
The NumLk indicator states that the integral keyboard is set in ten-key numeric keypad mode. 
CapsLock Indicator
The CapsLock indicator states that your keyboard is set to type in all capital letters. 
ScrLk Indicator
The ScrLk indicator states that your scroll lock is active.
24 - Status Indicator Panels