Yamaha MU90R, Owner'S Manual, Page: 9 / 165

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• Use only the stand/rack specified for the instrument. When attaching the
stand or rack, use the provided screws only. Failure to do so could cause
damage
to the internal components or result in the instrument falling over.
• 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.
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REPLACING THE BACKUP BATTERY
• This instrument contains a non rechargeable internal backup battery which
permits internal data to remain stored even when the power is off. When
the
backup battery needs replacing, the message “Battery Low!” will display
in the display. When this happens, immediately back up your data (using
an external device such as the floppy disk-based Yamaha MIDI Data Filer
MDF2), then have qualified Yamaha service personnel replace the backup
battery.
• Do not attempt to replace the backup battery yourself, in order to prevent
the possible serious hazards. Always have qualified Yamaha service
personnel replace the backup battery.
• Never place the backup battery in a location that a child can reach, since
a child might accidentally swallow the battery. If this should happen,
consult a physician immediately.
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SAVING USER DATA
• Save all data to an external device such as the Yamaha MIDI Data Filer
MDF2, in order to help prevent the loss of important data due to a
malfunction
or user operating error.
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.
PRECAUTIONS
PLEASE READ CAREFULLY BEFORE PROCEEDING
* Please keep these precautions in a safe place for future reference.
WARNING
Always follow the basic precautions listed below to avoid the possibility of serious injury or even death from electrical
shock, short-circuiting, damages, fire or other hazards. These precautions include, but are not limited to, the following:
• Do not open the instrument or attempt to disassemble the internal parts or
modify them in any way. The instrument contains no user-serviceable
parts.
If it should appear to be malfunctioning, discontinue use immediately
and have it inspected by qualified Yamaha service personnel.
• Do not expose the instrument to rain, use it near water or in damp or wet
conditions, or place containers on it containing liquids which might spill
into any openings.
• If the AC adaptor cord or plug becomes frayed or damaged, or if there is a
sudden loss of sound during use of the instrument, or if any unusual
smells or smoke should appear to be caused by it, immediately turn off
the power switch, disconnect the adaptor plug from the outlet, and have
the instrument inspected by qualified Yamaha service personnel.
• Use the specified adaptor (PA-3B) only. Using the wrong adaptor can
result in damage to the instrument or overheating.
• Before cleaning the instrument, always remove the electric plug from the
outlet. Never insert or remove an electric plug with wet hands.
• Check the electric plug periodically and remove any dirt or dust which
may have accumulated on it.
CAUTION
Always follow the basic precautions listed below to avoid the possibility of physical injury to you or others, or damage
to the instrument or other property. These precautions include, but are not limited to, the following:
• Do not place the AC adaptor cord near heat sources such as heaters or
radiators, and do not excessively bend or otherwise damage the cord,
place heavy objects on it, or place it in a position where anyone could
walk
on, trip over, or roll anything over it.
• When removing the electric plug from an outlet, always hold the plug
itself and not the cord.
• Do not connect the instrument to an electrical outlet using a multiple-
connector. Doing so can result in lower sound quality, or possibly cause
overheating
in the outlet.
• Remove the adaptor plug from the outlet when the instrument is not to be
used for extended periods of time, or during electrical storms.
• 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.
• Do not expose the instrument to excessive dust or vibrations, or extreme
cold or heat (such as in direct sunlight, near a heater, or in a car during
the
day) to prevent the possibility of panel disfiguration or damage to the
internal components.
• Do not use the instrument near other electrical products such as televisions,
radios, or speakers, since this might cause interference which can affect
proper operation of the other products.
• Do not place the instrument in an unstable position where it might
accidentally fall over.
• Before moving the instrument, remove all connected adaptor and other
cables.
• When cleaning the instrument, use a soft, dry cloth. Do not use paint
thinners, solvents, cleaning fluids, or chemical-impregnated wiping cloths.
Also, do not place vinyl or plastic 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.