Samsung NP-R50 User Manual page 31

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When you press a function key combination, the system sound may be
temporarily muted.
12 Users Manual
Scroll Lock Scrolls the screen up and down while the cursor position does not
change in some applications.
Volume Down Decreases the audio volume.
Volume Up Increases the audio volume.
Brightness Up Makes the LCD screen brighter.
Brightness Down Makes the LCD screen dimmer.