Alto ACL8, Service Manual

Page: 17 / 22

Symptom Likely Cause What to do
Speaker not connected to active
AC power Verify that speaker is connected and that the circuit is
on
Power not switched on Switch on power and verify that power Led is on
Speaker power cable is faulty or
omproperly connected. *Re-seat theh power cable at both ends;
*Substitute a known-good power cable
Blown fuse
*Check fuse and replace with same type "spare fuse
in holder"
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
Faulty cables and connections
*Disconnect and re-seat signal cables;
*Replace suspected cable with a known-good cable
No sound with
microphone
connected directly to
the MIC/LINE input
Microphone requires phantom
power
The EON does not supply phantom power. Switch to
a dynamic microphone, use a battery powered
microphone (if possible), use and external phantom
power supply for condenser type microphones.
Signal sounds
distorted and very
loud, LIMIT light is lit
most of the time
Excessive input signal, rying to
exceed the capabilities of the
speakers *Reduce the output level of the source;
*Turn down the level controls on the speaker;
*Use additional EON speakers
Lots of hiss in the
sound, the mixer
controls are at very
low settings.
Inproper 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 yout mixer and adjust controls as
needed;
*Input sensitivity(gain);
*Channel faders;
*Master faders;
Improper A/Cgounding, ground
loops
*"lift" the audio ground by using an XLR/F to XLR/M
adapter on one end.
*Re-route audio cables away from AC power and
lighting cables.
Excessively long unbalanced
cable run
*Use the balanced outputs(if available)of yout mixer
or source equipment to drive your EON speakers.
*Use a "DI"(direct injection) box to convert your
unbalanced equipment output to a balanced output.
Improper system gain structure
Reduce the INPUT level controls and increase the
output level of your source devices.
Hum or Buzz
No sound
No sound, speaker is
connected to working
AC power but won't
come on
No sound. Speaker
comes on
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8. Trouble Shooting