Harman JBL EON 600 Series Service Manual page 11

Troubleshooting
Symptom
No sound
No sound, speaker is connected
to working AC power but won't
come on.
No sound. Speaker comes on.
No sound with microphone
connected directly to the
MIC/ LINE input.
Signal sounds distorted and
very loud, PEAK light is lit
most of the time.
Signal sounds distorted even at
moderate volumes, LIMIT light
is not lit.
Lots of hiss in the sound,
the mixer controls are at
very low settings.
Noise or hiss heard at output.
Hum or Buzz that increases or
decreases when the mixer level
controls are moved.
Hum or Buzz
Table of Contents
Likely Cause What to do
Speaker not connected
Verify that speaker is connected and that the circuit is on
to active AC power
Power not switched on Switch on power and verify that power LED is on
Speaker power cable is faulty • Re-seat the power cable at both ends.
or improperly connected. • Substitute a known-good power cable
Signal source • Check VU meters on the source mixer
(mixer, instrument, etc.) • Verify that the tape or CD is playing.
is not sending. • Use headphones to verify that the instrument is actually
sending an audio signal
Faulty cables and • Disconnect and re-seat signal cables.
connections • Replace suspected cable with a known-good cable
The EON does not supply phantom power. Switch to a dynamic
Microphone requires
microphone, use a battery powered microphone (if possible),
phantom power
use an external phantom power supply for condenser type microphones.
Excessive input signal, trying • Reduce the output level of the source.
to exceed the capabilities of • Turn down the level controls on the speaker.
the speakers
• Use additional EON speakers.
Review the Owner's Manual for your mixer and adjust controls as needed.
• Input sensitivity (gain)
Mixer or other source
• Channel faders
is overdriven
• Master faders Once this is done, review the instructions in the Quick
Start section of this guide.
• 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.
Improper gain structure
• Input sensitivity (gain)
• Channel faders
• Master faders
Disconnect the devices that are connected to your speaker one at a time.
Noisy source device If the noise goes away, the problem is with the source or the
connecting cable.
Improper A/C ground or
Disconnect or mute channels one at a time to isolate the problem. Refer to
faulty equipment connected
the owner's manual of the faulty equipment for troubleshooting help.
to mixer input
Faulty cable between source
Substitute a known-good cable for the suspected faulty cable.
equipment and mixer
Improper A/C grounding, • 'Lift' the audio ground by using an XLR/F to XLR/M adapter on one end.
ground loops • Re-route audio cables away from AC power and lighting cables.
• Use the balanced outputs (if available) of your mixer or source
Excessively long equipment to drive your EON speakers.
unbalanced cable run • Use a "DI" (direct injection) box to convert your unbalanced equipment
output to a balanced output.
Improper system gain Reduce the INPUT level controls and increase the output level of your
structure source devices.
EON600 Series Service Manual
Version A - 06/20
11