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Intimidation Professional sub advice please

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    Intimidation Professional sub advice please

    Hi all

    Far as i can tell this unit not producing any audio , although customer mentioned it does , but distorted .

    Anyway , started by testing impedance of main driver speaker .


    Measuring 80R , which i have not experienced before .


    Anyone familiar with this unit enough to know ?


    Can't seem to find any info on it .

    See picture of label on speaker .
    Attached Files

    #2
    Re: Intimidation Professional sub advice please

    Most of the Blastking drivers seem to be 8Ω

    Comment


      #3
      Re: Intimidation Professional sub advice please

      Thanks RJ for confirming .

      Will test with another driver & report back

      Comment


        #4
        Re: Intimidation Professional sub advice please

        Tried one of my chunky 4 ohm speakers on this unit , but still no audio .

        Comment


          #5
          Re: Intimidation Professional sub advice please

          Have a feeling there's an issue on the input board .

          Became suspicious when i noticed the LED for signal wasn't registering .

          Also cannot scope any audio on ribbon lead from input PCB to MAIN , although if i poke around on main , can measure an extremely low peak to peak audio signal.

          Comment


            #6
            Re: Intimidation Professional sub advice please

            Some progress made on this unit .

            Discovered a low reading of 30R between pins 15 & 13 of U15 ( IRS2092S ) , compared to same measurement on other channel , which was over 4K .

            It's a drive chip for one of the channel output devices , which seemed to have survived .

            Surprised protection mode didn't kick in .

            Still not sure about the speaker impedance .
            Attached Files

            Comment


              #7
              Re: Intimidation Professional sub advice please

              There likely is no protection circuit. I suspect the output mosfets could also be bad, I see what looks like a lead trimming or solder splash on the mosfet lead in the lower left of your picture.

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                #8
                Re: Intimidation Professional sub advice please

                Hi RJ , there is an LED on unit labelled protection .

                I did notice the solder splash also , but suspect that's during manufacture , as it doesn't seem unit has been opened before .

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                  #9
                  Re: Intimidation Professional sub advice please

                  Pulled out the driver , which has a larger diameter than any pizza i have ever seen , 47 CM in fact .

                  Now impedance reading 1R2 therefore assume it has shorted turns .

                  I guess it should be a 4 ohm .

                  Not sure why the high reading before . Quite possibly meter probes not contacting fully .

                  Any suggestions for a replacement .
                  Attached Files

                  Comment


                    #10
                    Re: Intimidation Professional sub advice please

                    With the added cost of bass driver customer has decided against repairing .

                    Not having a particularly fruitful week .

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