DD-45/YDD-40 Owner’s Manual
3
PRECAUTIONS
PLEASE READ CAREFULLY BEFORE PROCEEDING
* Please keep this manual 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 place the power 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.
• Only use the voltage specified as correct for the instrument. The required voltage is
printed on the name plate of the instrument.
• Use the specified adaptor (page 31) only. Using the wrong adaptor can result in
damage to the instrument or overheating.
• Check the electric plug periodically and remove any dirt or dust which may have
accumulated on it.
• This instrument contains no user-serviceable parts. Do not open the instrument or
attempt to disassemble or modify the internal components in any way. 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 any
liquid such as water seeps into the instrument, turn off the power immediately and
unplug the power cord from the AC outlet. Then have the instrument inspected by
qualified Yamaha service personnel.
• Never insert or remove an electric plug with wet hands.
• Do not put burning items, such as candles, on the unit.
A burning item may fall over and cause a fire.
• Always replace all batteries at the same time. Do not use new batteries together with
old ones.
• Do not mix battery types, such as alkaline batteries with manganese batteries, or
batteries from different makers, or different types of batteries from the same maker,
since this can cause overheating, fire, or battery fluid leakage.
• Do not tamper with or disassemble batteries.
• Do not dispose of batteries in fire.
• Do not attempt to recharge batteries that are not intended to be charged.
• Keep batteries away from children.
• If the batteries do leak, avoid contact with the leaked fluid. If the battery fluid should
come in contact with your eyes, mouth, or skin, wash immediately with water and
consult a doctor. Battery fluid is corrosive and may possibly cause loss of sight or
chemical burns.
• Always make sure all batteries are inserted in conformity with the +/- polarity
markings. Failure to do so might result in overheating, fire, or battery fluid leakage.
• When the batteries run out, or if the instrument is not to be used for a long time,
remove the batteries from the instrument to prevent possible leakage of the battery
fluid.
• When one of the following problems occur, immediately turn off the power switch and
disconnect the electric plug from the outlet. (If you are using batteries, remove all
batteries from the instrument.) Then have the device inspected by Yamaha service
personnel.
• The power cord or plug becomes frayed or damaged.
• It emits unusual smells or smoke.
• Some object has been dropped into the instrument.
• There is a sudden loss of sound during use of the instrument.
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 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.
• When removing the electric plug from the instrument or an outlet, always hold the plug
itself and not the cord. Pulling by the cord can damage it.
• Remove the electric plug from the outlet when the instrument is not to be used for
extended periods of time, or during electrical storms.
• Do not place the instrument in an unstable position where it might accidentally fall
over.
• Before moving the instrument, remove all connected cables.
• When setting up the product, make sure that the AC outlet you are using is easily
accessible. If some trouble or malfunction occurs, immediately turn off the power
switch and disconnect the plug from the outlet. Even when the power switch is turned
off, electricity is still flowing to the product at the minimum level. When you are not
using the product for a long time, make sure to unplug the power cord from the wall
AC outlet.
• Use only the stand 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.
• 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.
• 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.
• 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 panel.
• 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 use the instrument/device or headphones 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.
Always turn the power off when the instrument is not in use.
Even when the [
] (Standby/On) switch is turned off, electricity is still flowing to the instrument at the minimum level. When you are not using the instrument for a long time, make sure
you unplug the power cord from the wall AC outlet.
Make sure to discard used batteries according to local regulations.
Power supply/AC power adaptor
Do not open
Water warning
Fire warning
Battery
If you notice any abnormality
Power supply/AC power adaptor
Location
Connections
Handling caution
Yamaha cannot be held responsible for damage caused by improper use or modifications to the instrument, or data that is lost or destroyed.
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