Section 8: Trouble Shooting - JBL 515 XT User Manual

Section 8: Trouble Shooting

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
The inputs from INPUT 1 and
INPUT 2 aren't coming out of the
OUT connector
The speaker connected to the OUT
connector goes up in volume when
I adjust the INPUT 3 control on the
24
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
or improperly connected.
Blown fuse
Signal source
is not sending.
Faulty cables and connections
The EON does not supply phantom power. Switch to a dynamic
Microphone requires
phantom power
use an external phantom power supply for condenser type microphones.
Excessive input signal, trying
to exceed the capabilities of
the speakers
Excessive BASS or TREBLE
boost
Review the Owner's Manual for your mixer and adjust controls as needed.
Mixer or other source
is overdriven
Improper gain structure
Disconnect the devices that are connected to your speaker one at a time. If
Noisy source device 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, ground
loops
Excessively long unbalanced
cable run
Reduce the INPUT level controls and increase the output level of your
Improper system gain structure
source devices.
MIX/LOOP SWITCH
set improperly
MIX/LOOP SWITCH
Disengage the MIX/LOOP OUT switch, Set to LOOP.
set improperly
sending an audio signal
section of this guide.
your mixer and adjust controls as needed.
to drive your EON speakers.
output to a balanced output.