Electro-Voice ZLX-12P-AX, Руководство пользователя

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Troubleshooting
Problem Possible Cause(s) Action
1. No sound Amplifier Connect a known working test loudspeaker to the
amplifier outputs. If there is no sound, verify all the
electronics are on, the signal routing is correct, the
source is active; the volume is turned up, etc.
Correct/repair/replace as necessary. If there is sound,
the problem is wiring.
Wiring Verify you have connected the correct cables to the
amplifier. Play something at a low level through the
amplifier. Connect the test loudspeaker in parallel with
the malfunctioning line. If the sound level is gone or is
very weak, the line has a short in it (possibly a severe
scrape, pinch, or a missed connection). Using the test
loudspeaker, 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 If no subwoofers are used with the system, select the
OFF position.
3. Intermittent output
such as cracking or
distortion Faulty connection Check all connections at amplifier and loudspeakers to
ensure they are all clean and tight. If the problem
persists, check the wiring. See problem 1.
4. Constant noise
such as buzzing,
hissing or humming Defective source or
other electronic
device If noise is present, but no program material is playing,
evaluate each component as necessary to isolate the
problem. Most likely there is a break in the signal path.
Poor system
grounding or ground
loop Check and correct the system grounding, as required.
Input gain knob is
not in the MIC
position Slowly increase the input gain knob level to engage the
microphone pre-amp.
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 requiring
phantom power, an external phantom power source is
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.
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Electro-Voice User Manual 2015.12 | 02 | F.01U.319.253