L-Acoustics LA8 Maintenance Manual page 13

Issue
No sound and no error
message
(controller not in standby
mode, refer to the LA
NWM video tutorial)
LA8_MM1_E N_2.0
Sound
Possible causes
1. outputs muted
2. wrong input mode
3. wrong preset selection
4. gain value too low on the
controller
5. audio source not plugged
or plugged into the wrong
input connector
6. audio source cable
incorrectly plugged
7. audio source cable
damaged
8. wrong settings on the
audio source
9. non-audio bit stream
10. audio source failure
11. loudspeaker not plugged
or plugged into the wrong
output connector
12. loudspeaker cable
incorrectly plugged
13. loudspeaker cable
damaged
14. loudspeaker damaged
15. mains failure
16. other cause
w w w . l - a c o u s t i c s . c o m
Inspection procedure / Diagnosis
Unmute the outputs.
If the fallback mode is ON, switch it OFF.
Select the input mode according to the audio
source format (analog or AES/EBU).
Select a preset in accordance with the loudspeaker
system connected to the outputs.
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.
Plug and secure each XLR cable into the audio
source and the corresponding input connector on
the controller:
 Analog input connector for an analog audio
source.
 AES/EBU input connector for AES/EBU audio
source.
Unplug the XLR cable and plug it again on the audio
source and the controller.
Replace the XLR cable.
Set appropriate parameter values on the audio
source, in particular the output gain value (refer to
the third party documentation).
Verify that the AES/EBU source does not deliver
non-audio bit stream (e.g. encoded audio).
Inspect the 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.
Plug and secure each PA-COM
cable into the loudspeaker and the corresponding
output connector on the controller.
Unplug the PA-COM ® or SpeakON
it again on the audio source and controller.
Replace the PA-COM ® or SpeakON
If only one loudspeaker is connected, inspect it.
Otherwise, go to next step.
Inspect the mains.
Contact L-ACOUSTICS ® .
continued on next page...
® ®
or SpeakON
® cable and plug
® cable.
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