Alto Professional TMX80DFX Guide D'utilisation Rapide page 6

TROUBLESHOOTING
SYMPTOM
No sound from speaker
Signal sounds distorted
and very loud; LIMIT
light is lit most of the
time.
Lots of hiss in the sound,
the mixer controls are
at very low settings.
Noise or hiss heard at
Output.
Hum or Buzz increases or
decreases when the mixer
level controls are moved.
CAUSE
Signal source (mixer, instrument,
etc) is not sending.
Excessive input signal; trying to
exceed the capabilities of the
speakers.
Improper gain structure.
Noisy source device.
Improper A/C ground or faulty
equipment connected to mixer
input. Faulty cable between
source equipment and mixer.
6
ACTION
*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
*Reduce the output level of the
source;
*Turn down the level controls
on the speaker;
*Try another pair of speakers
*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;
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.
Disconnect or mute channels
on at a time to isolate the
problem.
Substitute a known good cable
for the suspected faulty cable.