Electro-Voice EVID operation manual Appendix C Troubleshooting Table

Appendix C — Troubleshooting Table

Troubleshooting Table

Problem	Possible Causes	Action
No output	Amplifier	Make sure the amplifier channel is being fed an input
		signal (preferably via a “signal input” indicator on the
		amp).
		Check that the amplifier channel’s volume is turned up.
		Connect the speaker and cable, which had no output
		to another amplifier channel, making sure an input
		signal is fed to the new amp channel. If you then get
		output, the problem was the amplifier channel. If not,
		then the problem may be in the cable or speaker.
	Speaker cable(s)	Replace the cable(s) connecting the loudspeaker
		system and amplifier.
Questionable or	Faulty connection	Check all cabling for proper connector contact. A bad
intermittent out-		connection can result in intermittent contact or
put such as		dramatically increased resistance, which in turn can
crackling		cause reduced output or noises unrelated to the signal.
	Improper power	Check the power tap setting under the speaker grille to
	tap setting	ensure the setting is appropriate for the installation and
		amplifier chosen.
Constant noise	A faulty electronic	Since loudspeakers cannot generate these sounds by
such as buzzing,	device in the	themselves, you may have a faulty electronic device in
hissing, or	signal chain	the signal chain.
humming
	Poor system	Check and correct the system grounding, as required.
	grounding
Poor low-	Out-of-polarity	When two speakers are hooked up out of polarity (out
frequency	hookup between	of phase), the low frequencies cancel each other out.
output	multiple speakers	Try reversing the polarity of one of the speakers either
		by turning around a dual-banana plug at the amplifier
		or by reversing the tip/sleeve leads on the jack.
		Whichever condition results in greater low-frequency
		output is the in-polarity condition.

If none of the suggestions below solves your problem, contact your nearest EV© service center or EV distributor.

12 EVID™ Ceiling Series Installation and Operation Manual