250Ti, network diagram and upgrade

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10-13-2022, 09:42 AM
georgebrooke

1 Attachment(s)

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

Attachment 91189
10-13-2022, 01:26 PM
rdgrimes

FWIW a search for the part number returns this: https://diagramas.diagramasde.com/au...20CLASSICS.pdf
10-14-2022, 03:56 AM
georgebrooke

Are you sure?

Quote:

Originally Posted by rdgrimes

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
10-14-2022, 04:31 AM
BMWCCA

Quote:

Originally Posted by georgebrooke

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.
10-14-2022, 04:32 AM
Odd

No problem with the link.

Let us know if the diagram does not match your speakers. I have another variant.
10-14-2022, 04:36 AM
Earl K

1 Attachment(s)

Here, did the download for you.

Attachment 91194

EarlK
10-14-2022, 07:30 AM
rdgrimes

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.