L-Acoustics LA8 User manual

LA8 AMPLIFIED CONTROLLER
MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
www.l- a c o u s t i c s . c o m

LA8 AMPLIFIED CONTROLLER
MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
LA8_MM1_EN_2.0 w w w . l - a c o u s t i c s . c o m 2 / 21
SAFETY INSTRUCTIONS
1. Read this document.
2. Read all SAFETY INSTRUCTIONS carefully as well as DANGER and OBLIGATION warnings.
3. Never incorporate equipment or accessories not approved by L-ACOUSTICS®.
4. Strictly follow the sequence of the successive steps in all procedures.
5. Never use a faulty apparatus.
An apparatus showing any sign of issue must immediately be put aside and withdrawn from use.
6. Never attempt to perform a maintenance operation not mentioned in this manual.
This manual contains the maintenance operations authorized for the End User (level 1).
Performing another operation will expose the user to hazardous situations.
Contact L-ACOUSTICS®for advanced maintenance.
7. Follow all legally prescribed instructions if sending an apparatus to L-ACOUSTICS®for maintenance.
Save all user presets to files using LA NETWORK MANAGER software.
SYMBOLS
The following symbols are used in this document:
DANGER
This symbol indicates a potential risk of harm to an individual or damage to the product.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation
of the product.
ELECTRICAL HAZARD
This symbol indicates a potential risk of electrical injury.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation
of the product.
OBLIGATION
This symbol notifies the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
EQUIPMENT
This symbol indicates the equipment, tools, and spare parts required to perform a procedure.
INFORMATION
This symbol notifies the user about complementary information or optional instructions.

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CONTENTS
REVISION HISTORY 4
GLOSSARY 4
INTRODUCTION 4
1EQUIPMENT AND TOOLS 5
2QUALITY CONTROL 6
3DIAGNOSIS 7
Diagnosis table ............................................................................................................................................................. 7
Exploded view............................................................................................................................................................ 15
Working time .............................................................................................................................................................15
4MAINTENANCE PROCEDURES 16
D/R 001 –FRONT FRAME........................................................................................................................................16
D/R 002 –FOAM FILTER .......................................................................................................................................... 17
D/R 003 –Power plug................................................................................................................................................ 18
D/R 004 –REAR BRACKETS ..................................................................................................................................... 19
APPENDIX: KR LIST 20

LA8 AMPLIFIED CONTROLLER
MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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REVISION HISTORY
Document identification
Distribution date
Modifications
LA8_MM1_EN_1.0
June 11th, 2013
Initial version
LA8_MM1_EN_2.0
June 10, 2014
Updated for firmware V. 2.1.3.3
GLOSSARY
CE
Europe
CN
China
D/R
disassembly/reassembly
KR
Replacement Kit
JP
Japan
LA NWM
LA NETWORK MANAGER remote control software
LA8
in a general context: amplified controller of LA8 type
when used along with LA8CN, LA8JP or LA8US: LA8 CE version
LA8CN
LA8 CN version
LA8JP
LA8 JP version
LA8US
LA8 US version
MODULE
part of an amplified controller, written in uppercase characters
SMPS
Switched Mode Power Supply (power supply inside of the controller)
US
United States
INTRODUCTION
This LA8 maintenance manual –level 1 is intended for End Users and gathers the level 1 procedures for the LA8
amplified controller (periodic maintenance, troubleshooting and disassembly/reassembly of outside MODULES).
It is intended to be used as follows:
Perform the QUALITY CONTROL procedure and note down all detected issues.1.
Refer to the DIAGNOSIS TABLE and EXPLODED VIEW for indications on how to address these issues.
2.
Perform the indicated corrective actions using the corresponding MAINTENANCE PROCEDURES.3.
Perform the QUALITY CONTROL procedure a new time to verify there are no remaining issues.4.

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1EQUIPMENT AND TOOLS
The following table is the complete list of equipment and tools required to perform all level 1 maintenance
procedures on the LA8 amplified controller.
Equipment and tools
Reference
Manufacturer
audio source with a known musical program
—
—
CAT5e U/FTP cable
—
—
ear protections
—
—
voltage absence tester
—
—
wire stripping pliers
793936
Facom
full range loudspeaker
—
L-ACOUSTICS
LA NWM
—
L-ACOUSTICS
subwoofer
—
L-ACOUSTICS
Stanley knife
0-10-018
Stanley

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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2QUALITY CONTROL
This procedure must be performed for periodic maintenance and to detect possible issues on a controller.
Tools
Name
Reference
Distributor
audio source with a known musical program
—
—
LA NWM
—
L-ACOUSTICS
CAT5e U/FTP cable
—
—
full range loudspeaker
—
L-ACOUSTICS
subwoofer
—
L-ACOUSTICS
ear protections
—
—
Procedure
Inspect the external structure of the controller for any lost or damaged part.1.
To verify if the controller is clean, follow these steps:2.
a. Disassemble the FRONT FRAME and the FOAM FILTER, see procedure D/R 001.
b. Verify if the FOAM FILTER is clean.
c. Look inside the controller through the front grill (do not touch any part) and verify if the inside is clean.
d. Reassemble the FRONT FRAME and the FOAM FILTER, see procedure D/R 001.
Plug the controller to mains and power it on.3.
Verify if the LCD screen and all LED lit during the start-up sequence.
To verify if the network functionalities of the controller work, follow these steps:4.
a. Connect the controller to an Ethernet port of the computer hosting LA NWM.
Use the CAT5e U/FTP cable.
b. Launch LA NWM.
c. Verify if the controller can be put in online mode (refer to the LA NWM video tutorial).
Verify if the latest version of firmware is installed (see the LA8 user manual or the LA NWM video tutorial).5.
If not, update firmware from LA NWM.
Select a known preset and verify if the indications displayed on screen are in accordance with it.6.
To verify sound presence and quality on each output channel follow these steps:7.
a. Plug the audio source to an input connector of the controller (IN A or IN B).
b. Plug the full range loudspeaker to output connector OUT1.
c. Select a corresponding preset.
d. Select the routing from the audio source to OUT1.
e. Play the musical program.
f. Set the OUT1 gain to -40 dB.
g. Unmute OUT1.
h. Set the OUT1 gain to obtain a medium sound level.
i. Verify if the sound is clear and undistorted.
j. Mute OUT1.
k. Repeat these steps for OUT2, OUT3 and OUT4.
There is a risk of ear damage due to high sound level.
Use ear protections.
To verify the power capability of each output channel follow these steps:8.
a. Plug the audio source to an input connector of the controller (IN A or IN B).
b. Plug the subwoofer to output connector OUT1.
c. Select a corresponding preset.
d. Select the routing from the audio source to OUT1.
e. Play the musical program.
f. Set the OUT1 gain to -40 dB.
g. Unmute OUT1.
h. Set the OUT1 gain to obtain a high sound level.
i. Verify if the sound remains clear and undistorted up to the limit level.
j. Mute OUT1.
k. Repeat these steps for OUT2, OUT3 and OUT4.

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3DIAGNOSIS
Diagnosis table
For any issue, follow the check sequence in the possible causes column.
At each step, apply the inspection procedure (if exists) and consider the resulting diagnosis.
See also the EXPLODED VIEW to obtain an overview of the disassembly/reassembly procedures.
External structure
Issue
Possible causes
Inspection procedure / Diagnosis
FOAM FILTER clogged
operation in very dusty or
cracked-oil smoke machine
environments
Clean the FOAM FILTER, see procedure
D/R 002.
Inside of the controller dirty
(visible from the front grill)
operation in very dusty or
cracked-oil smoke machine
environments
Contact L-ACOUSTICS®.
FOAM FILTER lost or damaged
mechanical shock
Replace the FOAM FILTER, see procedure
D/R 002.
FRONT FRAME lost or damaged
mechanical shock
Replace the FRONT FRAME, see procedure
D/R 001.
REAR BRACKETS lost or damaged
mechanical shock
Replace the REAR BRACKETS, see
procedure D/R 004.
CHASSIS damaged
mechanical shock
Contact L-ACOUSTICS®.
POWER CORD damaged
pulled, trampled, pinched,
frayed…
Contact L-ACOUSTICS®.
Power plug of wrong model
reference does not exist
Replace the power plug, see procedure
D/R 003.
CA-COM®or SpeakON®
connector damaged
mechanical or electrical shock
Contact L-ACOUSTICS®.
XLR connector damaged
mechanical shock
Contact L-ACOUSTICS®.
L-NET connector damaged
mechanical shock
Contact L-ACOUSTICS®.
LCD screen, encoder wheel, key,
or LED meter damaged on the
DISPLAY
mechanical shock
Contact L-ACOUSTICS®.

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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Front panel interface
Issue
Possible causes
Inspection procedure / Diagnosis
LCD screen switched off when the
LA8 is on (“black screen”)
POWER CORD not
1.
connected to mains
Connect the POWER CORD to the mains.
mains failure or wrong
2.
voltage
Verify if the mains is available and if the
voltage is compatible with the indications on
the identification plate of the controller
(back panel).
other cause
3.
Contact L-ACOUSTICS®.
LCD screen lit but nothing is
displayed (“blue screen”)
controller connected to a
1.
non-compatible network
Unplug all cables from the L-NET
connectors and restart the controller.
condensing humidity into
2.
the LCD screen
Put the controller in a non-condensing
environment and wait until the LCD screen
is dry.
other cause
3.
Contact L-ACOUSTICS®.
LCD screen lit but dark
any
Contact L-ACOUSTICS®.
Any action from the front interface
has no effect (controller not in
standby mode and not locked, see
the LA NWM video tutorial)
any
Contact L-ACOUSTICS®.
One meter LED does not work
whereas another LED of this
meter works
any
Contact L-ACOUSTICS®.
The L-NET LED does not work
when online (see the LA NWM
video tutorial)
any
Contact L-ACOUSTICS®.

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L-NET network (refer to the LA NWM video tutorial for software use)
Issue
Possible causes
Inspection procedure / Diagnosis
Impossible to connect a controller
to the L-NET network
(controller not in “blue screen”)
1. offline mode selected on
LA NWM
Select the online mode on LA NWM.
2. scanning range not
containing the controller IP
address
Include the controller IP address in the
scanning range on LA NWM.
3. wrong IP address
Set the computer IP address and subnet
mask as well as the controller IP address
as indicated in the LA NWM video
tutorial.
4. L-NET cable not plugged
or plugged into the wrong
L-NET connector
Plug and secure a CAT5e U/FTP cable into
the L-NET IN connector on the controller
and the network connector on the device
preceding the controller in the network
chain (computer, L-NET OUT connector on
another controller, or Ethernet switch).
Do the same for each cable of the network
chain from the controller to the computer.
5. L-NET cable incorrectly
plugged
Unplug the CAT5e U/FTP cable and plug it
again on both sides. Do the same for each
cable of the network chain from the
controller to the computer.
6. L-NET cable of wrong
model
Use straight-through Ethernet cables of
CAT5e U/FTP category (or higher) and of
100 m/328 ft maximum length.
If an Ethernet switch is used and the auto
MDI/MDIX functionality is not available on
it, use a crossover cable between the
switch and each controller.
7. L-NET cable damaged
Replace all damaged CAT5e U/FTP cables of
the network chain from the controller to
the computer.
8. another software client is
already connected to the
controller
Disconnect the software client.
9. firmware failure
Restart the controller.
10. other cause
Contact L-ACOUSTICS®.

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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Error message
Issue
Possible causes
Inspection procedure / Diagnosis
“High Temperature Ch x
Channel Attenuated”
“Over Temperature Ch x
Channel Muted”
room temperature too
1.
high
Reduce the temperature using a forced
ventilation system.
FOAM FILTER clogged
2.
Clean the FOAM FILTER, see procedure
D/R 002.
controller not getting
3.
enough cool air
Install the controller in an open area so
that the front and rear panels are located
at a minimum distance of 30 cm from any
external object or structure.
Do not block the front and rear
ventilation grills on a controller.
If the controller is rack-mounted:
Do not block the ventilation grills with
front or back panels or doors. If not
possible, use a forced ventilation
system.
When stacking more than one
controller in a rack, mount them
directly on top of each other or close
any open space in the rack with blank
panels.
channel xresources
4.
solicited to their limits
Monitor the LED meter for channel x on
the controller.
In case of persistent high level or clip,
reduce the audio source output level (refer
to the third party documentation) and/or
the gain value on channel x.
loudspeaker impedance
5.
too low
Verify that nothing causes a short-circuit at
output x(wrong cabling scheme, damaged
cable, or short-circuit in the speaker voice
coil).
Verify that the number of enclosures
connected in parallel to output xis not too
high.
other cause
6.
Contact L-ACOUSTICS®.
continued on next page…

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Error message (continued)
Issue
Possible causes
Inspection procedure / Diagnosis
“System Message
Fuseprotect”
and signal attenuated
controller resources solicited to
their limits
Monitor the LED meters on the controller.
In case of persistent high level or clip,
reduce the gain values of channels OUT1-4
on the controller and the output gain value
on the audio source (refer to the third
party documentation).
“System Message
Fuseprotect”
and signal muted
mains voltage drop when the
controller is on
Verify if each controller is connected to
mains with the following ratings: 16 A for
230 V or 30 A for 120 V (LA8, LA8CN or
LA8US), 15 A for 200 V or 30 A for 100 V
(LA8JP).
“DC on Channel x
Channel Muted”
sporadic DC presence
Lower the gain on channel x.
If the issue persists, inspect the audio
source.
“DC on Channel x
Channel Disabled”
persistent DC presence
1.
Inspect the audio source and restart the
controller.
other cause
2.
Contact L-ACOUSTICS®.
“ Error on Channel x
Channel Muted”
short-circuit in loudspeaker or
loudspeaker cable
Verify that nothing causes a short-circuit at
the controller outputs (wrong cabling
scheme, damaged cable, or short-circuit in
the speaker voice coil). Then restart the
controller.
“Error on Channel x
Channel Disabled”
sporadic error
1.
Restart the controller.
other cause
2.
Contact L-ACOUSTICS®.
“System Message
Waiting SMPS”
controller powered off
1.
Power the controller on.
controller power supply
2.
failure
Wait for 1 minute.
If the issue persists, restart the controller.
mains failure or wrong
3.
voltage
Verify if the mains works and if the voltage
is compatible with the indications written
on the back panel of the controller.
other cause
4.
Contact L-ACOUSTICS®.
“System Message
Waiting SMPS”
for 1 minute, then:
“System Message
SMPS ERROR”
any
Contact L-ACOUSTICS®.
“System Message
Update error”
firmware update failure
1.
Restart the controller.
If the issue persists, verify that each L-NET
cable works and is correctly plugged on
both ends, download firmware again and
re-launch the update process.
other cause
2.
Contact L-ACOUSTICS®.
“System Message
DSP ERROR”
any
Restart the controller.
If the issue persists, contact
L-ACOUSTICS®.
“System Message
INIT ERROR”
any
Contact L-ACOUSTICS®.
continued on next page…

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
LA8_MM1_EN_2.0 w w w . l - a c o u s t i c s . c o m 12 / 21
Error message (continued)
Issue
Possible causes
Inspection procedure / Diagnosis
“Invalid MAC address
Contact L-Acoustics”
controller may have a non-
unique MAC address
Contact L-ACOUSTICS®.
“System Message
Invalid L-NET Client”
controller is connected to a
non-compatible version of
LA-NWM
Update LA NWM to version 2.2.0.0 or
above.
Refer to the LA NWM video tutorial.

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Sound
Issue
Possible causes
Inspection procedure / Diagnosis
No sound and no error
message
(controller not in standby
mode, refer to the LA
NWM video tutorial)
outputs muted
1.
Unmute the outputs.
wrong input mode
2.
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
3.
Select a preset in accordance with the loudspeaker
system connected to the outputs.
gain value too low on the
4.
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
5.
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
6.
incorrectly plugged
Unplug the XLR cable and plug it again on the audio
source and the controller.
audio source cable
7.
damaged
Replace the XLR cable.
wrong settings on the
8.
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
9.
Verify that the AES/EBU source does not deliver
non-audio bit stream (e.g. encoded audio).
audio source failure
10.
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
11.
or plugged into 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
12.
incorrectly plugged
Unplug the PA-COM®or SpeakON®cable and plug
it again on the audio source and controller.
loudspeaker cable
13.
damaged
Replace the PA-COM®or SpeakON®cable.
loudspeaker damaged
14.
If only one loudspeaker is connected, inspect it.
Otherwise, go to next step.
mains failure
15.
Inspect the mains.
other cause
16.
Contact L-ACOUSTICS®.
continued on next page…

LA8 AMPLIFIED CONTROLLER
MAINTENANCE MANUAL –LEVEL 1
VERSION 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®.

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Exploded view
The following exploded view represents the MODULES of the LA8.
Each MODULE is indicated by a circled number. The box next to a circle indicates the disassembly/reassembly
procedure (D/R) associated to the MODULE.
No
MODULE name
1
FRONT FRAME
2
FOAM FILTER
3
power plug
4
REAR BRACKETS
Working time
Procedure
Working time (mn)
D/R 001
1
D/R 002
1
D/R 003
5
D/R 004
1

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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4MAINTENANCE PROCEDURES
D/R 001 –FRONT FRAME
Spare parts
KR LAXGRI
No
Description
Qty
1
frame
1
Replacement procedure
This procedure describes how to replace the FRONT FRAME on an LA8 amplified controller.
Pull the FRONT FRAME at one side and remove it from the controller.1.
Insert the two sides of a FRONT FRAME into the holes on the controller without locking.2.
Place the logo on the right.
Place the FOAM FILTER between the FRONT FRAME and the controller.3.
Push the FRONT FRAME on both sides until it is fully inserted.4.
A click must be heard on each side.

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D/R 002 –FOAM FILTER
Spare parts
KR LAXMOU
No
Description
Qty
1
foam filter
1
Cleaning or replacement procedure
This procedure describes how to clean or replace the FOAM FILTER of an LA8 amplified controller.
Pull on a FRONT FRAME side without removing it from the controller.1.
Do the same on the other side.2.
Remove the FOAM FILTER.3.
If the FOAM FILTER is intended to be cleaned, use mild dishwashing detergent or soap and then dry it.4.
Place a FOAM FILTER between the FRONT FRAME and the controller.5.
Push the FRONT FRAME on both sides until it is fully inserted.6.
A click must be heard on each side.

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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D/R 003 –Power plug
Tools
Name
Reference
Distributor
wire stripping pliers
793936
Facom
Stanley knife
0-10-018
Stanley
screwdriver adapted to the new power plug
—
—
voltage absence tester
—
—
Spare parts
No
Description
Qty
1
power plug
1
Safety
There is a risk of electrical injury when the high-voltage capacitors are charged.
Before any maintenance operation, disconnect the controller from mains and wait for 10 minutes so the
capacitors discharge completely.
Check that there is no voltage at the two pins of the power plug.
Replacement procedure
This procedure describes how to replace the power plug of an LA8 amplified controller.
Unplug the POWER CORD from the mains and wait for 10 minutes.1.
Check that there is no voltage at the two pins of the power plug.2.
Use the voltage absence tester.
Cut the POWER CORD near the plug.3.
Use the Stanley knife.
Strip the three wires of the power cord on a length compatible with the new plug.4.
Use the Stanley knife and the wire stripping pliers.
Fix the three wires on the new plug according to the color code of Table 1.5.
Use the screwdriver.
Table 1: Wire color code
Controller
Live
Neutral
Ground
LA8
Brown
Blue
Green / Yellow
LA8CN
LA8JP
LA8US
Black
White
Green

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D/R 004 –REAR BRACKETS
Spare parts
KR LABRACKET
No
Description
Qty
1
bracket
2
Replacement procedure
This procedure describes how to replace the REAR BRACKETS of an LA8 amplified controller.
Remove the two old REAR BRACKETS from the amplified controller pulling on them, see Figure 1.1.
Figure 1: Removing the REAR BRACKETS
Insert the two new REAR BRACKETS pushing on them until they are locked.2.

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MAINTENANCE MANUAL –LEVEL 1
VERSION 2.0
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APPENDIX: KR LIST
Reference
Concerned MODULE
KR contents
Associated
procedure
KR LABRACKET
REAR BRACKETS
2 brackets
D/R 004
KR LAXGRI
FRONT FRAME
1 frame
D/R 001
KR LAXMOU
FOAM FILTER
10 foam filters
D/R 002