Telex EVID Ceiling Speaker Systems - Manual (Page 14)

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
Appendix C — Troubleshooting Table