TROUBLE SHOOTING
This amplifier has multi-layer protection features to prevent damage from
misuse or faulty conditions to ensure long lasting life of your investment.
If the unit senses excessive heat, short circuited speakers, overload, or
voltage fluctuation outside of the working range the protection indicator
light will turn red and the unit will turn off. In order to solve this problem,
you should turn all levels down, power off the unit, then carefully check
the installation for wiring mistakes or shorts. If the amplifier is excessively
warm the protection light will not turn on as the unit will turn off to protect
itself from overheating. Let the unit cool down for 30 minutes and try
again. If the unit work, try moving the amplifier or make sure nothing is
covering it so it can vent heat off of the heatsink. Before you remove or
uninstall the amplifier, refer to the list below for suggested solutions.
Amplifier doesn’t turn on or not output:
•
Check the fuse(s), not just visually, but with a continuity meter and all 12+
volt and ground connection. Make sure you have 13+ volts. It is possible
for a fuse to have poor internal connections, take the fuse out of the
holder for the testing.
•
Check the input signal from the source unit using an AC voltmeter to
measure the voltage while it’s being played. The voltage should be from
0.5 to 15 volts from the RCA cables.
•
Check the output of the amplifier, test for output at the speaker output
of the amplifier.
•
Check to ensure that the speaker wires are making a good connection to
the amplifier and the subwoofers.
Amplifier goes into protection:
•
Check shorts on speaker wires or open coil.
•
Check input voltage from RCA, if DC signal is over 4 volts, the amplifier
will go into protection.
•
Remove and reset the power of the unit to check if it will turn on.
•
Check impedance to make sure it’s over the minimum load. Have a
working impedance of 2 Ohms strapped.
•
Check input voltage. BLAM RA754D have a working range of 10 to 16 volts.
•
Check the chassis ground connections.
Distorted / Attenuated / Noise sound:
•
Check the chassis – ground connection of all audio equipment
•
Check amplifier controls for errors, input level or crossover setting.
•
Check the speaker wires for a possible short, either between the positive
and negative leads or between a speaker lead and the vehicle’s chassis
ground.
•
Check the nominal load impedance to verify that the amplifier is driving
a load equal or greater than 2 Ohms.
•
Check the input signal cables to make sure signal is present at the
amplifier inputs and the cables are not pinched or loose. It may be
helpful to try a different set of cables/or a different signal source to
be sure.
•
Check speaker wiring for reverse polarity.
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