9
TROUBLESHOOTING
SYMPTOM
CAUSE
ACTION
No sound from speaker.
Signal source (mixer, instrument,
etc) is not sending.
*Check VU meters on the
source mixer;
*Verify that the tape or CD is
playing;
*Use headphones to verify
that the instrument is actually
sending an audio signal
Signal sounds distorted
and very loud; LIMIT
light is lit most of the
time.
Excessive input signal; trying to
exceed the capabilities of the
speakers.
*Reduce the output level of
the source;
*Turn down the level controls
on the speaker;
*Try another pair of speakers
Lots of hiss in the sound,
the mixer controls are
at very low settings.
Improper gain structure.
*Make sure that the MIC/LINE
switch is in the LINE
(disengaged) position;
*Reduce the level settings at
speaker, review the Owner's
Manual for your mixer and
adjust controls as needed;
*Input sensitivity(gain);
*Channel faders;
*Master faders;
Noise or hiss heard at
Output.
Noisy source device.
Disconnect the devices that
are connected to your speaker
one at a time. If the noise
goes away, the problem is
with the source or the
connecting cable.
Hum or Buzz increases or
decreases when the mixer
level controls are moved.
Improper A/C ground or faulty
equipment connected to mixer
input. Faulty cable between
source equipment and mixer.
Disconnect or mute channels
on at a time to isolate the
problem.
Substitute a known good
cable for the suspected faulty
cable.