L-Acoustics LA4X Maintenance Manual

Troubleshooting and diagnosis
Sound
Issue
Possible causes
Inspection procedure / Diagnosis
“System Message
Fan blocked”
FAN blades blocked
Remove the GRILL and FOAM FILTER to visually
inspect that no cable prevents the FAN blades
from moving, if so push the cable away, see
procedure
D/R 003
.
any
Contact L-Acoustics
®
.
No sound and no error
message
(controller
not
in standby
mode, refer to the
LA NWM video
tutorial
)
mains failure
Inspect the mains.
outputs muted
Unmute the outputs.
wrong input mode
If the fallback mode is ON, switch it OFF.
Select the input mode according to the audio
source format (analog or AES/EBU).
wrong preset selection
Select a preset in accordance with the
loudspeaker system connected to the outputs.
gain value too low on
the 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.
audio source not
plugged or plugged into
the wrong input
connector
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.
audio source cable
incorrectly plugged
Unplug the XLR cable and plug it again on the
audio source and the controller.
audio source cable
damaged
Replace the XLR cable.
wrong settings on the
audio source
Set appropriate parameter values on the audio
source, in particular the output gain value (refer
to the
third party documentation
).
non-audio bit stream
Verify that the AES/EBU source does
not
deliver non-audio bit stream (e.g. encoded
audio).
audio source failure
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.
loudspeaker not plugged
or plugged into the
wrong output connector
Plug and secure each SpeakON cable into the
loudspeaker and the corresponding output
connector on the controller.
loudspeaker cable
incorrectly plugged
Unplug the SpeakON cable and plug it again
on the audio source and controller.
loudspeaker cable
damaged
Replace the SpeakON cable.
loudspeaker damaged
If only one loudspeaker is connected, inspect it.
Otherwise, go to next step.
other causes
Contact L-Acoustics
®
.
continued on next page…

L-Acoustics LA4X Specifications

General

Brand	L-Acoustics
Model	LA4X
Category	Controller
Language	English