Alto Professional Radius 200 Série Guide D'utilisation page 11

Troubleshooting
Problem
The receiver does not
produce any sound.
There is audible interference
in the transmission.
The signal is distorted.
Solution
Make sure the receiver's power adapter is properly
connected to the power input and a power source.
Make sure the transmitter's batteries are properly inserted
and that their polarities (+ and –) are correct.
Make sure the transmitter and receiver are set to the same
frequency.
Make sure the receiver's audio output is properly connected
to your mixer, amplifier system, etc.
Make sure the receiver and transmitter are within 328 feet
(100 meters) and have a clear line of sight. Also, make sure
the receiver is not immediately near any metal objects or
devices that could cause RF interference (other wireless
systems, TVs, radio, etc.).
Lower the setting of the receiver's Squelch knob.
Make sure the receiver and transmitter are within 328 feet
(100 meters) and have a clear line of sight. Also, make sure
the receiver is not immediately near any metal objects or
devices that could cause RF interference (other wireless
systems, TVs, radio, etc.).
Make sure the receiver's antennae are properly attached to
its antenna terminals.
If you are using multiple transmitter-receiver pairs, make sure
the pairs are not using the same or adjacent frequencies.
Make sure the receiver is not immediately near any metal
objects or devices that could cause RF interference (other
wireless systems, TVs, radio, etc.).
Lower the setting of the receiver's Volume knob.
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