Electro-Voice ZLX-BRKT Owner's Manual download pdf (Page 21)

Electro-Voice ZLX Series Owner’s Manual 21

Troubleshooting

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 electronics 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 an MP3 device). 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.

2. Poor

Low-Frequency

Response

WITH SUB menu-

cross-over frequency

activated

Select the OFF position if no subwoofers are used with this system. For further

information, see the LCD DSP Controls.

3. Intermittent output

such as crackling

or distortion

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.

4. Constant noise

such as buzzing,

hissing, or 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 by using the VU meeter

indicator on the LCD screen. If the VU meter bar is solid or the system indicates LIMIT

the input or source level is too high. For further information, see the Quick Setup.

5. No sound produced

with microphone

connected to INPUT 1

or INPUT 2

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.

Input gain knob is not

in the MIC position

Slowly increase the input gain knob level to engage the microphone pre-amp.

6. Sound is distorted

front LED is OFF, LCD

screen LIMIT is ON.

Excessive input level Reduce the input level or loudspeaker level knobs to prevent limit.

Incorrect gain

structure or source

input (mixing console/

preamp) is overdriven

Verify level controls of the source are properly structured by using the VU meeter

indicator on the LCD screen. If the VU meter bar is solid or the system indicates LIMIT

the input or source level is too high. For further information, see the Quick Setup.

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 input level on the speaker. Positioning

the microphone close to the sound source will increase gain-before-feedback. See

Problem 6.

MODE is set to

MUSIC or CLUB

Change the MODE to LIVE or SPEECH. For further information, see LCD DSP

Controls.

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 Electro-Voice distributor.

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Electro-Voice ZLX-BRKT Owner's Manual Page 21

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