Axiom QC2.4, Руководство пользователя

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10
SAFETY AND PRECAUTIONS
• CAUTION: before using this product read carefully the following safety instructions. Take a look of this manual entirely and preserve it for
future reference.
When using any electric product, basic precautions should always be taken, including the following:
– To reduce the risk, close supervision is necessary when the product is used near children.
– Protect the apparatus from atmospheric agents and keep it away from water, rain and high humidity places.
– This product should be site away from heat sources such as radiators, lamps and any other device that generate heat.
– This product should be located so that its location or position does not interfere with its proper ventilation and heating dissipation.
– Care should be taken so that objects and liquids do not go inside the product.
– The product should be connected to a power supply mains line only of the type described on the operating instructions or as marked on the
product. Connect the apparatus to a power supply using only power cord included making always sure it is in good conditions.
– WARNING: The mains plug is used as disconnect device, the disconnect device shall remain readily operable.
– Do not cancel the safety feature assured by means of a polarized line plug (one blade wider than the other) or with a earth connection.
– Make sure that power supply mains line has a proper earth connection.
– Power supply cord should be unplugged from the outlet during strong thunderstorm or when left unused for a long period of time.
– Do not place objects on the product’s power cord or place it in a position where anyone could trip over, walk on or roll anything over it. Do not
allow the product to rest on or to be installed over power cords of any type. Improper installations of this type create the possibility of fire hazard
and/or personal injury.
– This product may be capable of producing sound levels that could cause
permanent hearing loss. Exposure to extremely high noise levels may cause
permanent hearing loss. Individuals vary considerably in susceptibility to noise-
induced hearing loss, but nearly everyone will lose some hearing if exposed
to sufficiently intense noise for a period of time. The U.S. Government’s
Occupational Safety and Health Administration (OSHA) has specified the
permissible noise level exposures shown in the following chart. According to
OSHA, any exposure in excess of these permissible limits could result in some
hearing loss. To ensure against potentially dangerous exposure to high sound
pressure levels, it is recommended that all persons exposed to equipment
capable of producing high sound pressure levels use hearing protectors while
the equipment is in operation. Ear plugs or protectors in the ear canals or over
the ears must be worn when operating the equipment in order to prevent
permanent hearing loss if exposure is in excess of the limits set forth here. Keep
your's attention that children and pets are more susceptible to excessive noise
levels.
IN CASE OF FAULT
• In case of fault or maintenance this product should be inspected only by qualified service personnel when:
– There is a flaw either in the connections or in the supplied connecting cables.
– Liquids have spilled inside the product.
– The product has fallen and been damaged.
– The product does not appear to operate normally or exhibits a marked change in performance.
– The product has been lost liquids or gases or the enclosure is damaged.
• Do not operate on the product, it has no user-serviceable parts inside, refer servicing to an authorized maintenance centre.
TROUBLESHOOTING
No Power • The amplifier's "POWER" switch is off.
• Make sure the mains AC outlet is live (check with a tester or a lamp).
• Make sure the mains plug is securely plugged into mains AC outlet.
No Sound • Is the input LEVEL control for the channel turned up?
• Is the SIGNAL LED illuminated? If not check if your signal level is too low or check the signal cable, mixer and other
equipment setting and cabling.
• Are you sure your signal cables works properly? check it using a cable tester or replacing with a new one.
• Is the SPEAKON cable connector correctly inserted? turn it clockwise until it clicks.
• Are you sure your power cable works properly? check it using a cable tester or replacing with a new one.
Distorted Sound • Input signal level is too high. Turn down your level controls.
NOTE: The loudspeakers should never be operated at a level which causes the amplifier Clip LEDs to illuminate
constantly.
Different channel
level
• Check if are using a balanced cable for one channel and an unbalanced one for the other, as this would cause a
considerable difference in channel levels.
• Be sure that your loudspeaker system is fully connected and both loudspeakers have the same impedance.
Noise / Hum
• Enable GND LIFT button on rear panel, if the problem persist press all GND LIFT buttons for all system's amplifiers.
• Whenever possible, preferably use only balanced cables. Unbalanced lines may also be used but may result in noise
over long cable runs.
• Sometimes it helps to plug all audio equipment into the same AC circuit so they share a common ground.
Duration Per Day
In Hours
Sound Level dBA
Slow Response
Typical
Example
8 90 Duo in small club
6 92
4 95 Subway Train
3 97
2 100 Very loud classical music
1.5 102
1 105 Traffic noise
0.5 110
0.25 or less 115 Loudest parts at a rock concert