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8
Troubleshooting
Problem
1.
2.
3.
4.
5.
Electro-Voice
Possible cause
No sound
Amplifier
Wiring
Intermittent
Faulty connection
output such as
crackling or
distortion
Constant noise
Defective source or
such as
other electronic
buzzing hissing
device
or humming
Poor system
grounding or ground
loop
Input gain knob is not
in the MIC position
No sound
Microphone requires
produced with
phantom power.
microphone
connected to
INPUT 1 or
INPUT 2
Input gain knob is not
in the MIC position
Sound is
Excessive input level
distorted front
LED is OFF,
LCD screen
LIMIT is ON
Installation manual
Action
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
still no sound, the problem may be wiring.
Verify you have connected the correct cables to
the amplifier. Play something at a low level
through the amplifier. Connect a 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.
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.
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.
Check and correct the system grounding, as
required.
Slowly increase the input gain knob level to
engage the microphone pre-amp.
Use a dynamic microphone that does not
require phantom power (+15 V). If using a
microphone requiring phantom power, enable
PHANTOM POWER is the DSP menu, or use an
external phantom power source.
Slowly increase the input gain knob level to
engage the microphone pre-amp.
Reduce the input level or loudspeaker level
knobs to prevent limit.
en
23
2017.07 | 02 | F.01U.341.640
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