Appendix C: Troubleshooting Table - Electro-Voice EViD 3.2 Owner's Manual

Problem
1. No sound
2. Poor low-
frequency
response
3. Intermittent output
such as crackling
or distortion
4. Constant noise
such as buzzing,
hissing, humming
If these suggestions do not solve your problem, contact your nearest Electro-Voice dealer or
Electro-Voice distributor.
14

Appendix C: Troubleshooting Table

Possible Cause(s) Action
Amplifier
Wiring
Speakers wired
out-of-polarity
Improperly wired
subwoofer panel
Faulty connection
Defective amplifier
or other electronic
device
Poor system
grounding or
ground loop
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.
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.
When two speakers are connected out of polarity
(out of phase), the low frequencies will cancel each
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.
Using a test speaker as described above, verify that
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.
Check all connections at amplifier and speakers to
ensure they are clean and tight. If the problem persists,
it may be in the amplifier or wiring. See no. 1 above.
If the noise is present but no program material is
playing, the likely cause is the signal chain in the elec-
tronics. Evaluate each component as necessary to iso-
late the problem.
Check and correct the system grounding, as required.
EVID Owner's Manual