Owner`s manual

14 EVID Owner’s Manual
Problem Possible Cause(s) Action
1. No sound Amplifier Connect a known working test speaker to the amplifier
outputs. If there is no sound, check that all the elec-
tronics are on, the signal routing is correct, the source
is active, the volume is turned up, and so on. Correct/
repair/replace as necessary. If there is sound, the
problem is in the wiring.
Wiring Verify that you have connected the correct wire pairs to
the amplifier. Play something at low level through the
amplifier (for example, from a CD player or tuner).
Connect the test speaker in parallel with the malfunc-
tioning line. If the sound has gone or is very weak, the
line has a short in it (possibly a severe scrape, pinch,
or staple puncture). If the sound level is normal, the
wire is open (possibly a cut wire or a missed connec-
tion). Using the test speaker, move down the line and
test each connection/junction until you find the problem
and correct it. Observe proper polarity.
If you are using the 12.1 subwoofer, use the test
speaker to verify that you have the inputs and outputs
connected to the correct wires. If the subwoofer input
panel is not correctly wired, there will be little or no
sound. Observe proper polarity.
2. Poor low- Speakers wired When two speakers are connected out of polarity
frequency out-of-polarity (out of phase), the low frequencies will cancel each
response other acoustically. Carefully observe the wire markings
or tracers on your speaker wires. Verify that the ampli-
fier (+) terminal is connected to the red speaker termi-
nals and the amplifier (–) terminal is connected to all
the black speaker terminals.
Improperly wired Using a test speaker as described above, verify that
subwoofer panel all amplifier and speaker wires are connected to their
proper terminals with the correct polarity. Reversing
just one set of amplifier wires can cut out all bass
output from the subwoofer.
3. Intermittent output Faulty connection Check all connections at amplifier and speakers to
such as crackling ensure they are clean and tight. If the problem persists,
or distortion it may be in the amplifier or wiring. See no. 1 above.
4. Constant noise Defective amplifier If the noise is present but no program material is
such as buzzing, or other electronic playing, the likely cause is the signal chain in the elec-
hissing, humming device tronics. Evaluate each component as necessary to iso-
late the problem.
Poor system Check and correct the system grounding, as required.
grounding or
ground loop
If these suggestions do not solve your problem, contact your nearest Electro-Voice dealer or
Electro-Voice distributor.
Appendix C: Troubleshooting Table