Alto Professional TMX120DFX - Manual (Page 10)

10
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.