See also:

When “CHECK DISC” is displayed
Press the eject button to unload the discs. Check that the disc is not damaged or scratched, and also check that the disc is inserted correctly. This message may appear when using some CD-RW discs ...

Bluetooth® audio operation
NOTE Depending on the connected device, it may not activate as per the following items or not work smoothly. ...

MUTE button (models without Hands-free system)
Press the “” button if you wish to immediately cut the volume to zero. The audio display will show “MUTE”. If you press the button again, the original sound volume will return and “MUTE” turns o ...