Karaoke System AST-250. Owner’s Manual
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1. Precautionary measures
1.1. During installation
• For connection of AST-250 to electricity mains use only input power with the voltage 220 V and alternative
current frequency 50 Hz.
• Install AST-250 at sufficient distance from walls and other objects. Special attention to be in respect of
distance between the device and wall which must be not less than 10 centimeters. Breach of this rule may
cause overheating of the device and possible flaming.
• Do not install AST-250 in places with strong vibration, on surfaces with incline, on unsteady, high surfaces,
in dusty and/or insufficiently ventilated places.
• Do not install AST-250 in places with high humidity; do not put on AST-250 vases, glasses and other objects
with liquids.
• Do not install AST-250 close to electric heaters, radiators and other sources of heat, in places with strong
and/or frequent changes of temperature, in places with intensive solar heating. It may cause device
overhearing and its breakage.
• During connection of AST-250 to external equipment carefully read manual for its use. Before connection
turn off AST-250 and disconnect power cord from electric circuit.
• During transfer of AST-250 from outside to warm room at cold season in order to prevent appearance of
condensate, it is necessary to leave the device at room temperature for 1 – 2 hours and only after that you
may connect the device to electric circuit.
• Do not connect power cord to electric circuit before completion of final installation of AST-250.
• Do not connect AST-250 to one power board simultaneously with other devices consuming big power.
Check that the total consuming power of connected to power board devices do not exceed 2000W.
• Do not put power cord close to electric heaters and other sources of heat. Do not put on power cord any
heavy objects. It may cause damage to power cord and injury by electric current.
1.2. During exploitation
• Avoid penetration of water and other liquids to surface and inside AST-250. Do not put objects with liquids
on device surface.
• Do not put in AST-250 foreign objects and do not leave them on device surface.
• Do not touch device and power cord by moist hands. Do not touch power cord during thunderstorm.
• Do not deform, twist and heat power cord. In case of damage to power cord replace it immediately.
• During disconnection of power cord from от electric circuit do not pull power cord, hold the plug.
• Do not cover ventilating holes and louvers on top and on each side of AST-250 housing. Do not exploit
device in poor ventilated places.
• Do not put on AST-250 heavy objects, do not step on and do not hang up the device.
• During movement of AST-250 to another place disconnect from the device connected units, disconnect
power cord from electric circuit. Do not carry the device to another place with foreign objects on it.
• If you do not use AST-250 during long time disconnect power cord from electric circuit.
• In case of fall the device or damage to device housing switch off AST-250, disconnect connected units,
disconnect power cord from electric circuit.
• Do not push buttons hard.
• In case of strange sound or smell of smoke immediately disconnect power cord from electric circuit, using
thick gloves or dry cloth.
• Do not dismantle and do not repair device independently. Repair to be arranged in authorized maintenance
shop.
1.3. During prophylaxis and cleaning
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