13
TROUBLESHOOTING
No sound from the unit
Full power cannot be obtained.
Sound is distorted.
Hum or buzz when a mixer is connected to the
unit.
Hum or buzz when using lighting controls in
the same building.
Low sound.
The MUTE led and the Temp Led are
indicating protection.
1 - The unit has activated the thermal
protection.
1 - Lower the input level and make sure the
amplifier is being cooled correctly. Check that
the fan is working and be sure that all the air
inlets/outlets are not blocked.
1-The console probably has unbalanced
outputs. You may be using an incorrect
unbalanced to balanced cable.
2 - The mixer and the powered speaker are
not plugged into the same mains outlet.
3 - The audio signal cable is too long or
too close to an AC cable.
1-The audio signal cable is too long or too
close to the lighting cable.
2 - On a sound system with three phase AC,
the lighting equipment and the unit are
connected to the same phase.
1 -The audio signal cable is defective.
2-The Level controls are not at maximum
position.
3 - Low input signal level.
4 - Using speakers with transformer in stero
mode.
1- Move the audio signal cable away from
lighting cables.Try to find out at what point
the noise is leaking into the system.
2 - Connect the sound system to a different
phase than the lights. You may need the help
of an electrician.
1- Check cabling and replace them.
2 - Turn up level controls of the output
channles.
3 - Turn up the level from the source.
4 - Change the amplifier´s mode from Stereo
to Bridge (100/70V).
1-Read the appendix of this manual to make a
correct unbalanced to balanced cable.
2 - Connect the mixer and the unit to the same
mains outlet.
3 - Use a cable that is as short as possible
and/or move the audio signal cable away from
mains cables.
1-The mixer or signal source is distorting.
2 - The output level from the mixer is too high.
3 - Amplifier clip shown in the channel.
1-Turn down the mixer´s output and check no
channels are distorting.
2 -Turn down the mixer´s output.
3 - Turn down input gain controls or lower
input signal level.
1 - The signal source does not have enough
ouput level and / or the amplifier GAIN is set to
a low value.
2 - Input gain controls are at very low volume.
1 - Use balanced outputs of a mixer.
Rise master ouput volume of the source.
Use a professional sound mixer providing
enough ouput voltage.
Set the amplifier gain to a higher value.
2 - Set up level controls at higher positions.
1 - The signal source is sending no signal.
2- Input gain controls are at minimum
position.
3 - Defective signal cables.
4 - Amplifier not plugged.
5 - Thermal protection activated.
1 - Check that the source is not muted and is
sending signal to the unit.
2 - Check input gain controls. Put them at
maximum level.
3 - Check that the cable from the source to the
unit is connected correctly. Replace the cable if
defective.
4 - Check the connections.
5 - Lower de input signal level and double
check that the amplifier fans are working
properly.
EP series / User’s Manual
PROBLEM CAUSE SOLUTION
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