Section 9: Trouble Shooting - JBL EON 210P User Manual

Section 9: Trouble Shooting

Symptom
No sound
Sound is distorted
Sound is thin
Sound is too boomy or dark
Hum or Buzz that increases
or decreases when the mixer
level controls are moved
Hum or Buzz
20
Likely Cause What to do
Make sure that the AC cord is properly seated into the AC receptacle
both at the wall outlet and on the mixer. Make sure the AC switch is in
No Power
the "ON" position. If you are using an "AC Strip" check to see that it
is working properly.
Make sure both the mixer's channel volume and master volume are
Volume's are turned down
turned up. Double check to see if the source volume is turned up.
Check to see if the input to the mixer is properly seated.
Mechanical connections
are loose
Check the speaker connections to see if they plugged in all of
the way.
Your speaker cables may have been damaged. Inspect for any cuts
Bad Cables
or crimps and if found, replace the cables.
If you are using a "Condenser" type microphone you will need to
Phantom Power is off
activate the "Phantom Power" switch for the microphone to work.
If the "Peak LED Indicator" is flashing red or on constantly you may
be overloading the input. On channels 1-4 turn the channel volume
down and press the MIC/LINE switch. Slowly bring the volume up. If
the distortion is gone but you don't have enough volume, turn up the
Input overload
master volume.
If you are using an external device like a personal music player or
electronic instrument try lowering the volume on that device.
Check the "SYSTEM LEVEL INDICATOR" LED's and if the "LIMIT"
System is overloading or red light at the top of the ladder is on constantly you may be
overdriving the system. Turn down the MASTER VOLUME.
Too much treble Check the channel's "TREBLE" control and turn it to the "0" position.
Not enough bass Check the channel's "BASS" control and turn it to the "0" position.
Speakers not Check the speaker connections to see if they plugged in all of the
connected properly way.
Effects levels may be too high Try turning down the MASTER EFFECTS RETURN.
Not enough treble Check the channel's "TREBLE" control and turn it to the "0" position.
Too much bass Check the channel's "BASS" control and turn it to the "0" position.
Improper A/C ground or faulty Disconnect or mute channels one at a time to isolate the
equipment connected to problem. Refer to the owner's manual of the faulty equipment for
mixer input troubleshooting help.
Faulty cable between source
Substitute a known-good cable for the suspected faulty cable.
equipment and mixer
Improper A/C grounding, Try using a ground lift adaptor. Connect all power cords to the
ground loops same power strip.
Try a shorter cable if possible, otherwise use a DI box to
Excessively long unbalanced
convert the unbalanced signal to a balanced signal and use
cable run
the appropriate cabling.
Reduce the INPUT level controls and increase the output level of
Improper system gain structure
your source devices.