Harman 518S manual Trouble Shooting, Symptom Likely Cause What to do

Section 8: Trouble Shooting

Symptom	Likely Cause	What to do
No sound	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
No sound, speaker is connected	Speaker power cable is faulty	• Re-seat the power cable at both ends.
	or improperly connected.	• Substitute a known-good power cable
to working AC power but won’t
come on.	Blown fuse	• Check fuse and replace with same type “spare fuse in holder”.
	Signal source	• Check VU meters on the source mixer
	(mixer, instrument, etc.)	• Verify that the tape or CD is playing.
No sound. Speaker comes on.	is not sending.	• 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	Microphone requires	The EON does not supply phantom power. Switch to a dynamic
connected directly to the		microphone, use a battery powered microphone (if possible),
	phantom power
MIC/ LINE input.		use an external phantom power supply for condenser type microphones.
Signal sounds distorted and very	Excessive input signal, trying	• Reduce the output level of the source.
loud, LIMIT light is lit most of the	to exceed the capabilities of	• Turn down the level controls on the speaker.
time.	the speakers	• Use additional EON speakers.
		Review the Owner’s Manual for your mixer and adjust controls as needed.
Signal sounds distorted even at	Mixer or other source	• Input sensitivity (gain)
moderate volumes, LIMIT light		• Channel faders
	is overdriven
is not lit.		• 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.
Lots of hiss in the sound,		• Reduce the level settings at speaker. Review the Owner’s Manual for
		your mixer and adjust controls as needed.
the mixer controls are at	Improper gain structure
		• Input sensitivity (gain)
very low settings.
		• Channel faders
		• Master faders
		Disconnect the devices that are connected to your speaker one at a time. If
Noise or hiss heard at output.	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
Hum or Buzz that increases or	faulty equipment connected
		the owner’s manual of the faulty equipment for troubleshooting help.
	to mixer input
decreases when the mixer level
	Faulty cable between source
controls are moved.		Substitute a known-good cable for the suspected faulty cable.
	equipment and mixer
	Improper A/C grounding, ground	• ‘Lift’ the audio ground by using an XLR/F to XLR/M adapter on one end.
	loops	• Re-route audio cables away from AC power and lighting cables.
		• Use the balanced outputs (if available) of your mixer or source equipment
Hum or Buzz	Excessively long unbalanced	to drive your EON speakers.
	cable run	• 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.
The inputs from INPUT 1 and	MIX/LOOP SWITCH
INPUT 2 aren’t coming out of the		Set the MIX/LOOP SWITCH to the MIX position (depressed).
	set improperly
OUT connector
The speaker connected to the OUT
connector goes up in volume when	MIX/LOOP SWITCH	Disengage the MIX/LOOP OUT switch, Set to LOOP.
I adjust the INPUT 3 control on the	set improperly
first speaker.
	Microphones are pointed into	Move the speakers so they do not point at the microphone’s pickup pattern.
	the speakers
Speakers feed back and howl	Equalizer settings	Locate the feedback frequency and reduce it using the mixer EQ or an
	are incorrect	external equalizer.
when the microphone volume is
turned up
	Excessive gain	Reduce the gain at the mixer and move the microphone closer
		to the sound source.

27