JBL 305 User Manual

Also see for EON305: User guide Instructions User guide User manual

Contents

JBL 305 User Manual Manual pdf 25 page image

25Section 8: Trouble ShootingSymptom Likely Cause What to doNo sound Speaker not connectedto active AC power Verify that speaker is connected and that the circuit is onPower not switched on Switch on power and verify that power LED is onNo sound, speaker is connectedto working AC power but won’tcome on.Speaker power cable is faultyor improperly connected.• Re-seat the power cable at both ends.• Substitute a known-good power cableBlown fuse • Check fuse and replace with same type “spare fuse in holder”.No sound. Speaker comes on.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 actuallysending an audio signalFaulty cables and connections • Disconnect and re-seat signal cables.• Replace suspected cable with a known-good cableNo sound with microphoneconnected directly to theMIC/ LINE input.Microphone requiresphantom powerThe EON does not supply phantom power. Switch to a dynamicmicrophone, use a battery powered microphone (if possible),use an external phantom power supply for condenser type microphones.Signal sounds distorted and veryloud, LIMIT light is lit most of thetime.Excessive input signal, tryingto exceed the capabilities ofthe speakers• Reduce the output level of the source.• Turn down the level controls on the speaker.• Use additional EON speakers.Signal sounds distorted even atmoderate volumes, LIMIT lightis not lit.Mixer or other sourceis overdrivenReview the Owner’s Manual for your mixer and adjust controls as needed.• Input sensitivity (gain)• Channel faders• Master faders Once this is done, review the instructions in the Quick Startsection of this guide.Lots of hiss in the sound,the mixer controls are atvery 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 foryour mixer and adjust controls as needed.• Input sensitivity (gain)• Channel faders• Master fadersNoise or hiss heard at output. Noisy source deviceDisconnect the devices that are connected to your speaker one at a time. Ifthe noise goes away, the problem is with the source or theconnecting cable.Hum or Buzz that increases ordecreases when the mixer levelcontrols are moved.Improper A/C ground orfaulty equipment connectedto mixer inputDisconnect or mute channels one at a time to isolate the problem. Refer tothe owner’s manual of the faulty equipment for troubleshooting help.Faulty cable between sourceequipment and mixer Substitute a known-good cable for the suspected faulty cable.Hum or BuzzImproper A/C grounding, groundloops• ‘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 unbalancedcable run• Use the balanced outputs (if available) of your mixer or source equipmentto drive your EON speakers.• Use a “DI” (direct injection) box to convert your unbalanced equipmentoutput to a balanced output.Improper system gain structure Reduce the INPUT level controls and increase the output level of yoursource devices.The inputs from INPUT 1 andINPUT 2 aren’t coming out of theOUT connectorMIX/LOOP SWITCHset improperly Set the MIX/LOOP SWITCH to the MIX position (depressed).The speaker connected to the OUTconnector goes up in volume whenI adjust the INPUT 3 control on thefirst speaker.MIX/LOOP SWITCHset improperly Disengage the MIX/LOOP OUT switch, Set to LOOP.Speakers feed back and howlwhen the microphone volume isturned upMicrophones are pointed intothe speakers Move the speakers so they do not point at the microphone’s pickup pattern.Equalizer settingsare incorrectLocate the feedback frequency and reduce it using the mixer EQ or anexternal equalizer.Excessive gain Reduce the gain at the mixer and move the microphone closerto the sound source.

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