Infinity iCar speaker Emit tweeter problem

Discussion in 'Infinity Loudspeakers' started by Microstudio, May 11, 2018.

  1. Microstudio

    Microstudio New Member

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    Hello all!

    I have a pair of vintage Infinity iCar speakers that I bought for my car back 1983... I have had them sitting in a cabinet in the house for over 20 years and I thought to make a bluetooth stereo system and use them. One of the Emit tweeters is not working right and I am hoping I can replace it/fix it. Can anyone tell by the pictures what model Emit tweeter these are and is there any good tutorials that show you how to work on these?

    Thank you for your time.


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    Thank you for your time.
     
    Last edited: May 12, 2018

     

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  2. swechsler

    swechsler Frog Whisperer

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    First I would ensure that the problem is the EMIT and not the crossover or the fuse. If it turns out that the problem IS the EMIT, there are threads here on how to repair them (your version is one of the more expensive types, although the diaphragms are pretty much interchangeable between all EMITs made in the 1980s, assuming you're willing to do the work).
     
  3. Microstudio

    Microstudio New Member

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    Thank you, what would be the testing procedure be to find out if it is or is not the Emit tweeter that is the problem?
     
  4. savatage1973

    savatage1973 Addicted Member

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    Pull the "dead" EMIT driver and desolder one of the leads to take it "out of circuit" and test for DCR with a DMM for continuity and resistance. It should read a in the low to mid 3 ohm range DCR. If it is just "distorting", you probably have an issue with a cap in the crossover or a diaphragm failing.
     
  5. Microstudio

    Microstudio New Member

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    Ok I will do this, thank you.
     
  6. Microstudio

    Microstudio New Member

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    Ok I tested the leads for DCR and got no readings so I then removed the tweeter as you see in the picture and inspected it for any damage and found none but with that said when testing for DCR there is no reading on my DMM.
    What is the best next step?

    Thank you for your time.



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  7. slimpikkins

    slimpikkins Super Member

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    You need to look at the traces with a jewelers loop. There most likely is a tiny broken piece. You can also test by holding a lead on the solder button and working backwards from the other testing right on the foil.
     
  8. swechsler

    swechsler Frog Whisperer

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  9. Microstudio

    Microstudio New Member

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    Thank you, I will read it.

    Thank for your time.
     
  10. Microstudio

    Microstudio New Member

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    Thank you, I did what you said and sure enough I found the break, what can I do to fix it?
     
  11. Microstudio

    Microstudio New Member

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    I read that but it is not my tweeter and I have a different break in mine.
     

     

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  12. swechsler

    swechsler Frog Whisperer

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  13. Microstudio

    Microstudio New Member

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    Thank you, I will try that.
     
  14. Microstudio

    Microstudio New Member

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    According to this post:

    (490125 is the rectangular EMIT with the thick magnet structure. 490126 is the same except for a round faceplate. Later versions of 490125 were labled 902-5086. Later versions of 490126 were labeled 902-5023.

    490123 is the rectangular EMIT with the thin magnet structure. As above, 490124 is the thin magnet structure with a round faceplate. Later versions of 490123 were labeled 902-2252. Later versions of 490124 were labeled 902-3082.

    They all use the same diaphragm.)


    The Emit's I have are 490125 I can use this diaphragms if my fix does not work.

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    Last edited: May 14, 2018
  15. Microstudio

    Microstudio New Member

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    Also today I ordered some Conductive glue that I will test and see if it will be useful.

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