Yamaha CD-NT670 - System Settings and Maintenance; Using the Sleep Timer

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Using the sleep timer
You can set the time to elapse which the unit automatically enters to standby mode.
Press several times to select the time.
• Time can be selected from 120/90/60/30 min., or OFF.
• The SLEEP indicator lights up when the sleep timer is
set.
• To cancel the sleep timer, press SLEEP again.
SLEEP