PROBLEM
No sound from the unit. The input
meters on the screen do not show
any signal presence.
Full power cannot be obtained.
LIMIT message never appears on
the screen.
Sound is distorted. LIMIT message
is not shown.
Sound is distorted and very loud
and LIMIT is displayed in the screen.
Hum or buzz when a mixer is
connected to the unit.
Hum or buzz when using lighting
controls in the same building.
The screen does not light up when
the mains connector is connected
and the unit is switched to ON.
CAUSE
1 – The signal source is sending no
signal.
2 – Defective cable.
3 - The amplifier has overheated.
The signal source does not have a
hot enough output.
The mixer or signal source is
distorting.
The system is overloaded and has
reached maximum power.
1.– The console probably has un-
balanced outputs. You may be using
an incorrect un-balanced 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.– Bad or loose AC connection to
the UNIT or the mains outlet.
2 – Faulty AC cable.
3 – Blown Fuse.
4 - The mains voltage is out of
range.
SOLUTION
1 – Check that the mixer or sound
source is sending signal to the UNIT.
2 – Check that the cable from the
sound source to the UNIT is
connected correctly. Replace the
cable if defective.
3 - Allow the unit to cool down for
some minutes and it will function
again. Check the main output level
of the mixer or channel gains since
the unit will have been functioning
with excessive levels.
If using a mixer, use the balanced
o u t p u t i f a v a i l a b l e . U s e a
professional mixer with a hotter
output.
Turn mixer channel gains down.
Check that none of your signal
sources are distorting.
Turn down the mixer's output.
1.– Read the appendix of this
manual to make a correct un-
balanced 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.– 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 your connections.
2.– Check the cables, connectors
and AC power with a suitable mains
tester.
3.- Replace the blown fuse for
another of the same type and size.
4.- If the multimeter determines that
the mains voltage is out the range,
you may need the assistance of an
electrician to find an appropriate
solution.
TROUBLESHOOTING
25
Manual del Usuario
/ vantec series /
User’s Manual
