LD Systems LDIPA412T Manuel D'utilisation page 10

CHANNEL STATUS LEDs for CHANNELS 1-4
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PROT (Protect) - The Protect LED displays different operating states. Details are provided in the table below.
LED status
Protect off
Protect is blinking slowly
(approx. 2Hz)
Protect is blinking quickly
(approx. 8Hz)
Protect permanently lit
The last Protect status is stored by the device. If the device is restarted, the last protect status of the respective channel/amplifier module is always
displayed during the restart and then deleted.
LIMIT - The LED lights up when the corresponding channel is operated in the upper limit range. Brief flashing of the LED is not critical. To protect the system, an
excessive signal level is gently reduced by the integrated limiter. If the limiter LED lights up longer or continuously, reduce the volume level.
SIG - The LED lights up when there is an audio signal on the corresponding channel.
MUTE SYMBOL CHANNEL 1 - 4
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The mute symbol lights up when the level control of the corresponding channel is turned fully counter-clockwise
corresponding channel is muted via the Ethernet expansion card.
21 BRIDGE LED CHANNEL 1/2 AND CHANNEL 3/4
The bridge LED of a channel pair lights up as soon as the channel bridge mode is activated for the corresponding channels (see point 5).
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Description
The amplifier module for the corresponding
channel functions normally.
The device has detected a high temperature
on the power supply or the amplifier board.
The speaker module functions normally. The
integrated temperature limiter reduces the
device's output power in order to prevent
the device from overheating. This status is
generally displayed on all channels. As soon
as the temperature falls again, the device
switches to normal operation.
The amplifier module for the corresponding
channel has detected a fault. To protect
the amplifier module and the connected
speaker, it is switched to mute. As soon as
the fault disappears, the amplifier module
switches back to normal operation.
The device has encountered a fatal fault. To
protect the device and connected speaker,
the device is switched to standby. This status
is generally displayed on all channels.
Possible causes
Concealed ventilation slots, dusty fans, long-term
operation under high load, operation at very
hot ambient temperatures, operation in racks
without airflow.
Short circuit of the amplifier output, operation
when the output impedance is too low, high-
frequency signal at the output, *power supply
overcurrent, *power supply fault
*In the case of power supply faults, the status is
displayed on all channels
Power supply overtemperature, amplifier board
overtemperature, DC voltage signal at the
output, DSP error.
Turn off the device and allow it to cool.
Disconnect all input and output cables and turn
on the device. If the fault is still displayed after
the system starts, please contact an authorised
service centre.
-∞
(channel is muted), or the