8
Troubleshooting
Before removing the ampli
fi
er, refer to the list below and follow the suggested
procedure. Always test the speakers and con
fi
rm that they are wired correctly
fi
rst. If in
any doubt get help from a quali
fi
ed auto electrician.
AMPLIFIER WILL NOT POWER UP
• Check for good ground connections. Ensure that the ground cable is connected directly to
bare metal and not a painted surface.
• Using a multimeter check the that remote terminal has at least 7V DC.
• Using a multimeter check that there is battery voltage on the positive terminal.
• Check all fuses.
• Check that the protection light is not illuminated. If it is lit, shut off the ampli
fi
er for thirty seconds
and then turn it back on.
PROTECTION LED ILLUMINATES WHEN AMPLIFIER IS POWERED UP
• Check for shorts on all speakers wires. (i.e no speaker wires should be joined together and no speaker
wires should be touching the car’s chassis)
• The ampli
fi
er is designed to shut down automatically when the units temperature goes above 80 degrees.
If the ampli
fi
er feels very hot then this may be the reason for the ampli
fi
er not starting.
• Remove the speaker wires and reset the ampli
fi
er. If the protection LED still comes on then the ampli
fi
er is
faulty. This damage may have been caused by either failure to follow these setup guidelines or abuse.
AMPLIFIER GETS VERY HOT
• Check the minimum speaker impedance for the ampli
fi
er is correct. This ampli
fi
er is not recommended for
impedance loads below 2 Ohm stereo and / or 4 Ohm bridged mono.
• Check for shorts on all speakers wires. (i.e no speaker wires should be joined together and no speaker wires
should be touching the car’s chassis)
• Check that there is good air
fl
ow around the ampli
fi
er. In some applications an external fan may be required.
BLOWN FUSE(S)
• Check both positive supply and ground for shorts.
• Check that the positive wire is connected to the positive terminal on the ampli
fi
er.
• Check that the negative wire is connected to the ground terminal on the ampli
fi
er.
• Ensure that the correct rated fuse is
fi
tted:
FLI UNDERGROUND 720.4 (25 amp x 2)
DISTORTED SOUND
• Check the gain control is not set at too high a level. If the speakers sound distorted turn the down the gain
until the sound is clear.
• Check that all crossover frequencies are correct. See Setup section for more details.
• Check for shorts on all speaker wires.
• Check all speakers are wired correctly. With the correct polarity being observed on each connection.
