Sony VGN-AW190NAB - Manual (Page 36)

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Using Your VAIO Computer
Buttons above the numeric keypad
Special-function button Functions
Muting button
Turns the volume on and off.
Volume control buttons
Decrease (-) and increase (+) the volume.
Drive eject button
Ejects the optical disc drive tray.
If this button does not work, try the substitute drive eject button on the optical disc drive.