Panasonic Toughbook CF-18BCAGCMM Reference Manual page 6

Key Combinations
Key
Fn+F4
Speaker on/off switch
Pressing this key combination turns on/off audio
from the internal speaker and headphone jack.
NOTE
Turning off the speaker will also turn off the
warning beep.
Speakers connected to the USB port
cannot be turned off.
Fn+F5
Volume control
(Fn+F5= down / Fn+F6= up)
Fn+F6
Pressing this key combination adjusts the volume
of the internal speaker and headphone jack.
NOTE
This key combination cannot be used to
adjust the volume of the warning beep or
speakers connected to the USB port.
Fn+F7
Forcing the standby function
Pressing this key combination causes the current
status of the computer to be saved to memory, and
puts the computer into the standby mode. (
25)
Functions
page
6
Popup Window
(Displayed after logging
on to Windows)
OFF
(MUTE)
ON