Samsung Notebook Windows Laptops Benutzerhandbuch

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This turns on when the Num Lock key is pressed and numeric keypad is activated.

This turns on when the Caps Lock key is pressed allowing capital letters to be typed without 

holding the Shift button down.

This turns on when the Scroll Lock key is pressed and screen scroll is locked.

This turns on when the hard disk is being accessed.

This turns on when the wireless LAN is operating.

This shows the power source and the battery charge status. 
Green:  When the battery is fully charged or the battery is not installed.
Amber: When the battery is being charged.
Off:       When the computer is running on battery power without being connected to AC adapter.

This shows the computer operating status.
On :      When the computer is operating
Blinks: When the computer is in Sleep mode.