Yamaha PSR-S900 Owner's Manual - Page 17
Powering Up - display
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Introduction Powering Up n Before you switch your PSR-S900/S700 on or off, first turn down the volume of any connected audio equipment. 1 Press the [STANDBY/ON] switch. The main display appears in the display. CAUTION In order to avoid possible damage to the speakers or other connected electronic equipment, always switch on the power of the PSR-S900/ S700 before switching on the power of the amplified speakers or mixer and amplifier. Likewise, always switch off the power of the PSR-S900/ S700 after switching off the power of the amplified speakers or mixer and amplifier. When you're ready to turn off the power, press the [STANDBY/ON] switch again. 2 Setting the volume Use the [MASTER VOLUME] dial to adjust the volume to an appropriate level. Air Vents CAUTION This instrument has special air vents in the top panel (see below) and rear panel. Do not place objects where they might block the air vent, since this may prevent adequate ventilation of the internal components, and possibly result in the instrument overheating. Air Vents PSR-S900/S700 Owner's Manual 17