Power amplifier Troubleshooting | en 29
Bosch Security Systems B.V.
Installation manual
2023-01 | V02 | F.01U.402.247
Problem Possible cause Solution
See
Set the loudspeaker
parameters (SPEAKER EQ),
page 19
.
Weak sound output, but with
no fault indications.
Incorrectly wired input
connectors.
Ensure that the input cables
are correctly match to the
polarity of the source (i.e.
wired correctly).
See
Audio inputs, page 21
.
Hum and hiss noise. Interference on inputs due to
unbalance cables or incorrect
connections.
Suggest using balanced input
cable wiring.
See
Audio inputs, page 21
.
Fault LED on the amplifier
channel is indicating solid
red.
1) Speaker cable has a short
or the cable is damaged.
2) incorrect AMP MODE
selected.
3) Internal amplifier channel
malfunction.
1) Check or replace speaker
cables and ensure that
connections are wired
correctly.
2) Select the appropriate
AMP MODE for your speakers.
See
Set the output mode
(AMP MODE), page 17
.
3) Contact service agent.
APD has been activated, but
the amplifier is not going into
standby mode.
1) Possible unintended signal
or interference on the input.
2) Signal could be present on
an unused channel from the
desired signal routing.
Check that there are no
unintended signals on any
inputs (including ground loop
interference).
Amplifier does not wake up
from APD.
Input source level is too low. Ensure that the input source
is active and delivering
sufficient signal to the
amplifier.
ecoRAIL is not activating as
expected.
Volume is set too high. Lower the volume, or
consider more sensitive
speakers which will deliver
higher volume with ecoRAIL
engaged.
Amplifier is working, but all
the red LEDs are flashing
every 2 seconds and the relay
is showing a fault status.
Fan error. Check blockages or if
something is caught in the
fan.
Output power is reducing,
and LIMIT LED is illuminating.
Amplifier is under extreme
thermal conditions, well
beyond operating
specifications of 45℃.
Consider changing the
location of the amplifier and
check that there is sufficient
airflow around the amplifier.
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