Sub-18A
Manual del usuario /
User's manual
11
5. TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
No sound from the UNIT. The
SIGNAL
presence LED indicator does not light
up.
1 – The signal source is sending no
signal.
2 – Defective cable.
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.
Full power cannot be obtained. The
LIMIT LED indicator never lights up.
1 – The signal source does not have a
hot enough output.
1 – If using a mixer, use the balanced
output if available. Use a professional
mixer with a hotter output.
Sound is distorted. The
LIMIT LED
indicator is not on, or only lights up
occasionally.
1 – The mixer or signal source is
distorting.
1 – Turn mixer channel gains down.
Check that none of your signal
sources are distorting.
Sound is distorted and very loud. The
LIMIT LED indicator lights up.
1 – The system is overloaded and has
reached maximum power.
1 – Turn down the mixer's output.
Hum or buzz when a mixer is
connected to the unit.
1 – The console probably has un-
balanced outputs. You may be using
an incorrect un-balanced to balanced
cable.
2 – The mixer and 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 – 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.
Hum or buzz when using lighting
controls in the same building.
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 – 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.
The power on LED indicators do not
light up when the power connector is
rotated and locked at the ON (
LOCK)
position.
1 – Bad or loose AC connection to
the UNIT or the mains outlet.
2 – Faulty AC cable.
3 – Blown Fuse.
1 – Check you connections.
2 – Check the cables, connectors and
AC power with a suitable mains
tester.
3 – Replace fuse on fuse holder with
one of the same type. If it blows
again, take the unit to a service
centre.
