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Thread: 250Ti, network diagram and upgrade

  1. #1
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    250Ti, network diagram and upgrade

    Hi,
    I recently acquired a pair of JBL 250ti Classic models...the shiny black "towers". I have replaced the shred of foam in the tweeter, which gave some worthwhile results but now I want to check out the crossover.
    The problem that I have is that the circuit does not seem to correspond exactly to the diagram that I have for this model. On top of this, it appears that a previous owner made modifications. There are now just 4 electrolytics in the circuit instead of the original 6. There is supposed to be a 40uF electrolytic in the circuit, but so far I have not found it...not have I found a suitable sized Mylar equivalent on the board. Not all of the new caps have their values in a readable form as they have been soldered with poor positioning.
    I could just go ahead and replace the 4 electrolytics, but before I do that I would ask for any advice anyone can give me on the correct circuit diagram for this crossover...and indeed any advice that they could give me.
    I have attached a photo of the first board that I have removed. i am saving the second for when I know more about the actual circuit.
    Thanks for any help provided
    George

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  2. #2
    Senior Member rdgrimes's Avatar
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    FWIW a search for the part number returns this: https://diagramas.diagramasde.com/au...20CLASSICS.pdf

  3. #3
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    Are you sure?

    Quote Originally Posted by rdgrimes View Post
    FWIW a search for the part number returns this: https://diagramas.diagramasde.com/au...20CLASSICS.pdf
    Thanks for the suggestion, but when I clicked on this my anti-malware software (Malwarebytes) got very excited and suggested that I avoid that website. Do you have any problems with this site?

    george

  4. #4
    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by georgebrooke View Post
    Thanks for the suggestion, but when I clicked on this my anti-malware software (Malwarebytes) got very excited and suggested that I avoid that website. Do you have any problems with this site?
    FWIW, I had no problem with the link or site and the information on the 250ti Classic was quite detailed.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  5. #5
    Senior Member Odd's Avatar
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    No problem with the link.

    Let us know if the diagram does not match your speakers. I have another variant.
    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

  6. #6
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    Here, did the download for you.


    250TIBQ CLASSICS.pdf

    EarlK

  7. #7
    Senior Member rdgrimes's Avatar
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    I'm surprised if that PDF isn't also lodged around the here somewhere. If its not it should be, I see Greg Timber's signature on it.

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