Owner`s manual

Electro-Voice ZxA1 Series Owners Manual
19
Troubleshooting
Problem Possible Cause(s) Action
1. No Sound Amplifier Connect a known working signal source to the amplifier inputs. If
there is no sound, check all the electronics are on, the signal routing
is correct, the source is active, the volume is turned up, and so on. If
there is sound, the problem is in the wiring, or a component further
up the signal chain.
Wiring Verify 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 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 polarity.
2a. Poor Low-Frequency
Response with ZxA1
WITH SUB switch
activated
Set the FULL RANGE/WITH SUB switch to the FULL RANGE
position.
2b. Poor Low-Frequency
Response with ZxA1-Sub
Incorrect polarity Set the NORMAL/REVERSE POLARITY to the opposite position.
3. Intermittent output
such as crackling
or distortion
Faulty connection or
damaged cable
Check all connections in the signal chain to ensure they are clean
and tight. If the problem persists, it may be in the amplifier or wiring.
See Problem 1.
4. Constant noise
such as buzzing,
hissing, humming
Defective source
or other electronic
device
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 the problem.
Poor system grounding
or ground loop
Check and correct the system grounding, as required.
Incorrect gain structure Verify level controls of the source are properly structured. Verify
microphone cables are plugged into MIC IN and line level cables are
plugged into LINE IN.
5. No sound produced
with microphone
connected to MIC IN
Microphone requires
phantom power
Use a dynamic microphone that does not require phantom power.
If using a microphone that requires phantom power, an external
phantom power source will be needed.
6. Sound is distorted.
LIMIT LED is constantly on
or flashing regularly
Excessive input level Reduce the Master Level or loudspeaker level knobs to prevent limit.
Line level source
plugged into MIC IN
Plug line level source into LINE IN
7. Sound is distorted.
LIMIT LED is not blinking
Source input (mixing
console/preamp) is
overdriven
Verify level controls of the source are properly structured.
8. Microphone produces
acoustic feedback when
input level is amplified.
Incorrect gain structure Reduce the microphone levels at the mixing console or input source. If
the microphone is connected directly to the speaker reduce the MIC
LEVEL on the speaker. Positioning the microphone close to the sound
source will increase gain-before-feedback.
Microphone position is
too close to the front of
the speaker
Whenever possible setup the speakers so the microphone is behind
them. If using the speakers in a monitor position aim the speaker to the
back of the microphone.
If these suggestions do not solve your problem, contact your nearest Electro-Voice dealer or distributor.