Troubleshooting - Electro-Voice ELX112P Owner's Manual

Troubleshooting

Problem Possible Cause(s)
1. No Sound
2. Poor LowFre- WITH SUB switch
quency
Response
3. Intermittent output
such as crackling
or distortion
4. Constant noise
such as buzzing, or other electronic
hissing, humming
5. No sound pro- Microphone requires
duced with micro-
phone connected to
input 2
MIC / LINE switch is
6. Sound is distorted. Excessive input level
LIMIT LED is con-
Line level source con-
stantly on or flashing
nected to INPUT 2
regularly
with MIC/LINE switch
7. Sound is distorted. Source input (mixing
LIMIT LED is not console/preamp) is
blinking
8. Microphone Incorrect gain struc-
produces acoustic
feedback when input
level is amplified.
NORMAL/BOOST
Microphone position
front of the speaker
If these suggestions do not solve your problem, contact your nearest Electro-Voice dealer or Electro-Voice distributor.
18
Amplifier Connect a known working test speaker to the amplifier outputs. If there is no
sound, check that all the electronics are on, the signal routing is correct, the
source is active, the volume is turned up, and so on. Correct/repair/replace
Wiring Verify that you have connected the correct wire pairs to the amplifier. Play some-
thing at low level through the amplifier (for example, from a CD player or tuner).
Connect the test speaker in parallel with the malfunctioning line. If the sound level
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 connection). Using the test speaker, move down the line and test
each connection/junction until you find the problem and correct it. Observe proper
Set the FULL RANGE / WITH SUB switch to the FULL RANGE position.
activated
Faulty Connection Check all connections at amplifier and speakers to ensure they are all clean and
tight. If the problem persists, it may be in the amplifier or wiring. See Problem 1
Defective source If the noise is present but no program material is playing, the likely cause is the
signal chain in the electronics. Evaluate each component as necessary to isolate
device
Poor system
grounding or
ground loop
Incorrect gain Verify level controls of the source are properly structured. Verify MIC/LINE switch
structure
Use a dynamic microphone that does not require phantom power. If using a mi-
phantom power crophone that requires phantom power, an external phantom power source will be
in LINE position
in MIC position
overdriven
Reduce the microphone levels at the mixing console or input source. If the micro-
ture phone is connected directly to the speaker reduce the input level on the speaker.
Positioning the microphone close to the sound source will increase gain-before-
Set the NORMAL/BOOST switch to the NORMAL position for vocal applications.
switch is in the
BOOST position
Whenever possible setup the speakers so the microphone is behind them. If using
is too close to the the speakers in a monitor position aim the speaker to the back of the microphone.
as necessary. If there is sound, the problem is in the wiring.
the problem.
Check and correct the system grounding, as required.
is in the correct position.
Set the MIC/LINE switch to the MIC position.
Reduce the input level or loudspeaker level knobs to prevent limit.
Set the MIC/LINE switch to the LINE position.
Verify level controls of the source are properly structured.
Electro-Voice Live X Series Powered Owner's Manual
Action
polarity.
above.
needed.
feedback.