LEM POWERFACTOR 3, Руководство пользователя, Страница: 8 / 24

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Preventing or identifying interference
First of all, check that the amplifier is installed in a place free from industrial or RF (radio frequency) interfer-
ence. Avoid installing your equipment very near radio or TV sets, mobile phones, etc., as these can cause
noisy interference.
When connecting the other components of your sound system, watch out for the so-called “ground loops”,
which could cause hum and jeopardize the amplifier’s excellent Signal-to-Noise and low distortion character-
istics.
The best way (even if not always feasible) to avoid ground loops is to connect the electric ground of all the
equipment to a single central point (the so-called “star” system). In this case, the central point in sound
systems is the mixer.
To help identify the cause of any interference, connect the various sections of the mixer to the rest of the
equipment in the following order, listening to the resultant sound as you proceed with connection:
Outputs: ampl loudspeaker enclosures (Master outputs);
ampl monitors (AUX outputs);
effects (AUX outputs or EFF send/return).
Inputs: instruments with line signals (keyboards, samplers, recorders, etc.);
microphones (lastly and one by one).
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Protection and maintenance
The amplifier is built in shock-resistant material. Nevertheless, protect it during transport with a flight-case to
avoid the risk of any casual accidents.
After long periods of use, particularly in dusty surroundings, accumulated dust may interfere with the
unit’s cooling. Without opening the amplifier and making certain it’s disconnected from the mains supply,
dust can be removed with a jet of compressed air, forcing it out through the chassis’ louvers. If the dust
build-up is excessive, don’t open the amplifier, as you could run the risk of serious electric shocks: contact
the nearest
Assistance Centre
Any dust on the outside of the chassis should be removed using a dry soft cloth or brush. Never use
alcohol, acetone or solvents of any kind.
The amplifier requires no further maintenance.
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In the event of breakdown
All user-adjustable parts are external and easily accessible.
Never open the amplifier: you could run the risk of serious electric shocks.
In the event of breakdown, contact the nearest
Assistance Centre
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Keeping the documentation
Keep this user’s manual for future consultation.
Also remember that the mixer will get a better price on the secondhand market if (as well as being in good
condition) if it has its original documentation and packaging.
Rules for installation and use