Signal LCS770 - User Manual

Questions and Answers

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Karen MoranAug 14, 2025
How to troubleshoot no power on Signal Amplifier?
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  Gina WalkerAug 14, 2025
  If your Signal Amplifier has no power, ensure the On/Off PA Vol. Knob is not in the OFF position. Also, check if the yellow wire is connected to switched +12VDC, inspect the connector, and verify that the power is not hooked up backwards. If you are using a positive ground vehicle, check if an external fuse or circuit breaker is in use. Finally, confirm that the negative leads are connected to a good ground.
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tabithaphillipsAug 17, 2025
What to do if Signal LCS770 siren sound is distorted?
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  Brian FloydAug 17, 2025
  If the siren sound from your Signal Amplifier is distorted, check if the speaker bell or tip is loose. Also, verify if the Aux. Input is used and wired properly, and ensure the input voltage is between 10-16 volts while the siren is on, as low or high vehicle voltage can cause distortion.
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Brandi WallaceAug 20, 2025
What to do if Signal LCS770 Amplifier siren tone is intermittent?
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  John AndersonAug 20, 2025
  If the siren tone on your Signal Amplifier is intermittent, it might be due to high or low voltage protection. The input must be greater than 10V with the siren turned on. Check if the vehicle voltage regulator is working properly. Also, ensure the connector is tight on the back of the unit, look for loose connections on the power lead, and make sure nothing is lying on the microphone. Verify that a circuit breaker with at least a 50A rating is used and check the speaker for water damage or pinched wires.
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Michelle WardAug 23, 2025
Why Signal LCS770 has no siren tone but PA works?
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  Sharon OlsonAug 23, 2025
  If your Signal Amplifier has no siren tone but the PA system works, it could be due to high or low voltage protection. The input voltage must be less than 16 volts, and the input must be greater than 10V with the siren turned on. Also, check if the microphone button releases properly, verify that the PK jumper option is properly configured, and test if the siren works when the Park Kill input is disconnected. Check for shorts or opens, ensure the PA Vol. is ON and turned up.
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Lindsay PayneAug 27, 2025
Why is the horn function stuck on Signal LCS770 Amplifier?
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  richardericksonAug 27, 2025
  If the horn function, manual, or phaser is stuck on your Signal Amplifier, check if the switch returns fully when released. Also, verify if the Aux. Input is used and wired properly, and ensure the AUX jumper option is properly configured.
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Mary NewtonAug 30, 2025
What to do if Signal LCS770 Amplifier has no radio or low radio?
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  Carlos WaltersAug 30, 2025
  If your Signal Amplifier has no radio or low radio, check if the radio is connected properly to the unit and if you can hear the radio in the vehicle. Also, try turning the Radio volume control and ensure the radio wires are connected to the correct polarity from the radio output.
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Dennis GraySep 2, 2025
Why is Signal Amplifier producing the wrong siren tone?
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  Dr. Virginia CarneySep 3, 2025
  If your Signal Amplifier is producing the wrong siren tone, check if the TT jumper option is properly configured, and ensure the AUX jumper option is configured properly as well.
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Timothy Hodges MDSep 6, 2025
Why is the Phaser not working on my Signal LCS770 Amplifier?
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  Gabriel HutchinsonSep 6, 2025
  If the Phaser is not working on your Signal Amplifier, ensure that the PD jumper option is configured properly.
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Mark WilkinsonSep 9, 2025
What to do if one light output is not working on Signal Amplifier?
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  Christina WagnerSep 10, 2025
  If one light output is not working on your Signal Amplifier, check the output fuses inside the unit, as the internal 20A fuse might be blown.