Question about Kenwood Car Audio & Video

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Just stopped working

Just got some 10'' infinity's and a kenwood amp, everything has been working fine and one day it stopped the amp turns on just no output i checked all the wires everything is connected and nothing has been switched. i checked the audio cords from the head to the amp everything connected still.

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  • bowenchick Apr 15, 2009

    the amp still comes on and yes all the fuses check out..all the lights and fans on the amp come on just no subs

  • bowenchick Apr 18, 2009

    ok ive isolated the issue..its definately the subs...but the weird thing is i know i didnt blow them or anything i checked the wires in the box they were fine, when i took the sub out and just tried to connect it directly from the sub itself to another known working amp it made abosolutely NO noise......very weird in my opinoin...even if i did blow them they should make a noise right?



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Please check if the supply is still present in your amp using a multimeter. if you dont have a multimeter, check the fuse that supply the amp. a broken fuse will not turn the amp. let us know.

Posted on Apr 15, 2009

  • cebuwano Apr 15, 2009

    Ok. Lets find out which block it fails.

    Check the sub speaker alone, sub amp and cd player source.

    1. check
      the sub speaker alone. Turn the unit off. Disconnect the sub speaker wire
      from your sub amp and connect any 1.5V
      battery (1 AA or 1 AAA size). If you hear any static when you spark the 1.5V battery, you sub speaker is
      good. Reconnect the sub speaker to your sub amp.

    2. check the sub amp. Find the audio input
      of your sub amp. Disconnect that line input wire. Turn the unit on then
      touch that input line of your sub amp, if you hear a 60Hz hum you sub amp
      is ok. Another way is to hook up another source into your sub amp input.
      If no sound, you may have to open the sub amp and look inside for open
      fuse if you have not done this yet but if you see lights on in your sub
      amp, you don’t need to do this.

    3. check
      the source. While your sub amp input is disconnected, the other wire is an
      output of your cd source. Hook up that wire directly to any availabale
      speaker. If you hear sound, that means your cd source is ok and your
      problem is on the sub amp section.

    Please put some electrical tapes
    for open wires to avoid short circuit.

    Let us know.

  • cebuwano Apr 18, 2009

    you did good. if the suppy fuse is blown, there is no noise as there is no supply going in. if the hybrid ic or solid state amplifier is blown and the fuse is OK, you may probably heard a noise.
    since you have found the issue next is to dig in whats goin on inside the sub amp. 2 things you should before handing to the specialist or deciding to buy one.
    check the following inside the subwoofer amplifier:
    1. verify that the power supply section is normal. voltage in is 11-15V and voltage out if its step up is 24 to 48v may be. the dc capacitor inside the circuit can give you hint on whats the output voltage after step up. should be lower than the rated voltage on cap. example, 16V or 25V on cap so supply is 12V.
    2. amplifier circuit that handles the amplification. if it is IC type, might me damaged. a helpful datasheet will help you find the supply input pin of that IC. also the input output of audio and the corresponding supply voltage of that components.
    let us know. thanks.



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