Yamaha S90 ES Owner's Manual page 5

Connections
• Before connecting the instrument to other electronic components, turn off the
power for all components. Before turning the power on or off for all
components, set all volume levels to minimum. Also, be sure to set the volumes
of all components at their minimum levels and gradually raise the volume
controls while playing the instrument to set the desired listening level.
Maintenance
• When cleaning the instrument, use a soft, dry cloth. Do not use paint thinners,
solvents, cleaning fluids, or chemical-impregnated wiping cloths.
Handling caution
• Do not insert a finger or hand in any gaps on the instrument.
• Never insert or drop paper, metallic, or other objects into the gaps on the
keyboard. If this happens, turn off the power immediately and unplug the power
cord from the AC outlet. Then have the instrument inspected by qualified
Yamaha service personnel.
• Do not place vinyl, plastic or rubber objects on the instrument, since this might
discolor the panel or keyboard.
• Do not rest your weight on, or place heavy objects on the instrument, and do not
use excessive force on the buttons, switches or connectors.
• Do not operate the instrument for a long period of time at a high or
uncomfortable volume level, since this can cause permanent hearing loss. If you
experience any hearing loss or ringing in the ears, consult a physician.
Yamaha cannot be held responsible for damage caused by improper use or modifications to the instrument, or data that is lost or destroyed.
Always turn the power off when the instrument is not in use.
Saving data
Saving and backing up your data
• The edited settings are lost when you turn off the power to the instrument
without saving. Make sure to save important data to internal (User) memory (see
page 126).
• Saved data may be lost due to malfunction or incorrect operation. Save
important data to a USB storage device.
• Never attempt to turn off the power while data is being written to internal
memory (while an "Executing..." or "Please keep power on" message is shown).
Turning the power off in this state results in loss of all user data and and may
cause the system to freeze.
This means that this synthesizer may not be able to start up properly, even when
turning the power on next time.
Backing up the USB storage device
• To protect against loss through media damage, we recommend that you save
your important data onto two USB storage devices.
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