Marantz SR5200N - Manual (Page 24)

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ENGLISH 5.SLEEP TIMER
When the SLEEP button o / ¤3 is pressed, the setting on or off and
the remaining time of the sleep timer function are displayed.
You can change the mode between on, off and the amount of time to
elapse before the unit will shut itself off by cycling the SLEEP button o/¤3.
6. OSD OFF
When OSD button ¤2 is pressed, OSD system will be bypassed after 3
seconds.
Then there is no indication on the TV display.
Press the OSD button ¤2 again to activate the OSD.