L-Acoustics LA8, Руководство по обслуживанию

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LA8
AMPLIFIED CONTROLLER
MAINTENANCE MANUAL – LEVEL 1
VERSION 2.0
LA8_MM1_EN_2.0
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Sound (continued)
Issue Possible causes Inspection procedure / Diagnosis
Noise
Level loss
Distorted sound
gain value too high on the 1.
controller
Set an appropriate gain value on channels OUT1 to
OUT4.
If the AES/EBU input mode is selected, set an
appropriate AES/EBU input gain value.
output gain value too high 2.
on the audio source
Set an appropriate output gain value on the audio
source (refer to the
third party documentation ).
switch to the analog 3.
fallback mode with wrong
AES/EBU input gain value
Set an appropriate AES/EBU input gain value and
inspect the digital audio source for failure.
Reminder: A
digital audio source can meet the
following failures: no clock, loss of lock, invalid
audio (validity bit), CRC error, bipolar encoding
error, data slip.
A validity bit at non-audio value will
not trigger the
automatic fallback. Instead the signal will be muted.
wrong preset selection 4.
Select a preset in accordance with the loudspeaker
system connected to the outputs.
audio source cable 5.
incorrectly plugged
Unplug the XLR cable and plug it again on the audio
source and the controller.
Verify with your installer if ground loops can occur.
audio source cable 6.
damaged
Replace the XLR cable.
wrong settings on the 7.
audio source
Set appropriate parameter values on the audio
source (refer to the
third party documentation ).
audio source failure 8. Inspect the audio source for failure.
loudspeaker plugged into 9.
the wrong output
connector
Plug and secure each PA-COM ® or SpeakON ®
cable into the loudspeaker and the corresponding
output connector on the controller.
loudspeaker cable 10.
incorrectly plugged
Unplug the PA-COM ® or SpeakON ® cable and plug
it again on the audio source and the controller.
Verify with your installer if ground loops can occur.
loudspeaker cable 11.
damaged
Replace the PA-COM
®
or SpeakON
®
cable.
loudspeaker damaged 12.
If only one loudspeaker is connected, inspect it.
Otherwise, go to next step.
mains failure 13. Inspect the mains.
other cause 14.
Contact L-ACOUSTICS
®
.