Yamakawa MR-240 - Manual (Page 27)

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Menu Settings
5. Backlit time: There are 4 backlit time levels; 10, 30, 60, and permanent.
These refer to the length of time in seconds the backlight will remain on
after pressing a button.
6. Contrast level: Set the display contrast from level 1 to 10.
7. Default setting: You may choose to resume your settings to default by
pressing either "Yes" or "No."
8. Version number: For checking the firmware version of this player.
9. Idle time: The device will automatically power off when it is left for a
specified idle time. For example, you can set it at 3 seconds and the
device will turn off when it is left idle for this length of time.
10. ASD (Audio Silence Detection): This menu allows you to choose the
length of silence before ending the current line-in recording and starting a
new file. You can also turn the silence detection feature off with this menu.