See also:

Adjustable level of each volume
...

Ejecting all discs from the player (all disc ejection mode)
1. If you continue to press the “” button, the player will produce beep sound and will enter the all disc ejection mode. At this time, the disc number indicator and “ALL EJECT” indicator will flash. ...

Key lock-in prevention function
This function prevents the doors from being locked with the key still in the ignition switch. ...