TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

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  • r2digital
    Member
    • Sep 2011
    • 39
    #1

    TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

    Hey guys, im trying to figure out why my ceiling speaker has no output from the woofer or tweeter. I cannot seem to get a resistance at the main input speaker terminals but i did measure resistance at the woofer and at the tweeter wires individually and everything seems to be OK. Ive done a little bit of troubleshooting on my own and when i was probing the negative terminal in combination with any component (PTC fuse, the capacitor, and any of the resistors) on the crossover i get no continuity what so ever. However, when i take the same model speaker but a fully working one and i probe the negative terminal in combination with any of the components listed above i get continuity. What section of the crossover would cause a no output condition? I've been toying with the fact that its the PTC resettable fuse but i am unsure if its used to only protect the tweeter or if its used to protect the entire design.



    Join Date: Aug 2010
    I checked all the resistors and the values are as follows

    25w2ΩJ=1.5
    25w2ΩJ=1.5
    10w2.2ΩJ=1.4
    10w2.2ΩJ=1.4
    10w2.7ΩJ=2.8

    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31044
      • Albion
      #2
      Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

      thats a stupid design, the vibration will fuck the soldering.
      check the joints on the back of the board.

        Comment

        • r2digital
          Member
          • Sep 2011
          • 39
          #3
          Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

          I will touch up and reflow all the joints on the back of the PCB. Do the resistance values seem correct? When i check the resistance values of the same model of a working speaker the results are much closer to their rating.
          For example the
          25W2ohmJ=2.2ohms
          10W2.2ohmJ=2.3

          Should i be concerned the the different values on the non working speakers?

            Comment

            • r2digital
              Member
              • Sep 2011
              • 39
              #4
              Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

              looks like some one already got to the PCB before me. Lots of deep scratches on the pcb. I think maybe one of them is deep enough to cut a trace to the negative post?


              free animated gif flag
              Last edited by r2digital; 07-31-2021, 01:00 PM.

                Comment

                • petehall347
                  Badcaps Legend
                  • Jan 2015
                  • 4427
                  • United Kingdom
                  #5
                  Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

                  the thermistor is there to protect the tweeter .

                    Comment

                    • r2digital
                      Member
                      • Sep 2011
                      • 39
                      #6
                      Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

                      Does anyone what i should check if i have no output from the tweeter/midbass? Verified the tweeter and midbass work fine individually

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 31044
                          • Albion
                          #7
                          Re: TDGAUDIO NFC-83A ceiling speaker crossover repair(no output)

                          draw the circuit.
                          it doesnt look like a crossover though - only one cap.

                            Comment

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