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M-audio EX66 strange Capacitor name or type?

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  • M-audio EX66 strange Capacitor name or type?

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    Hi, i have this old m-audio ex66 that has a distortion problem.
    i think i figure out the problem but i don't the name of the type smd capacitor or witch value it should be.
    its the gray one that my tweezers are on. you can see 4 more more on the board.
    it's very soft, melts and breaks down very easy with the solder iron, its not like other smd capacitor that are hard.
    try a regular smd capacitor and its giving me strange noise, so i think it need's that type capacitor.
    i have some other parts of m audio but i can't seem to find it in any of the ones i have
    try looking for schematic couldn't fine one, so if any body has it please let me know
    thank you
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  • #2
    It's probably polystyrene, they are chosen for their excellent characteristics. And yes, they will melt if you put a soldering iron on them so never do that. It almost certainly wasn't your problem and without knowing the value I'm afraid you're not in a good place. You can try contacting them and asking for more info.
    Experience is something you get, just after you really needed it.

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    • #3
      hey thank you,
      yeah reading more about polystyrene, i think you are right.
      I got some info from M-audio, but still waiting on the value from them.
      I was able to remove one of the polystyrene cap it without destroy it, with the hot air station.
      So i have one working again.
      But thanks for the help, i am one step forward

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      • #4
        I'm glad you heard something from them. My secret weapon for soldering these caps is to use lead free low temperate solder Sn 42% / Bi 57% / Ag 1% type 4902P by MG Chemicals. It melts at 138C.
        Experience is something you get, just after you really needed it.

        Comment


        • #5
          From what I've read about polystyrene caps I always thought they were not suitable for SMT, e.g. https://www.electrocube.com/pages/wh...ors-data-sheet or
          https://www.electronics-notes.com/ar...olystyrene.php or http://my.execpc.com/~endlr/film.html
          There is good reason that the leads of PS caps are typically very thin.

          Are there current manufactures of SMD polystyrene caps?
          Last edited by Helmholtz; 09-14-2020, 09:31 PM.
          - Own Opinions Only -

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          • #6
            Yeah Helmholtz i see what you mean.
            i don't know if there are any current manufactures of SMD polystyrene caps.
            looking o the internet i can't seem to find any. If not i will try putting a regular one on it see if it work.
            But i am still waiting on the value from M-audio.
            I talk to the owner and he understand, wants see if it can fix before buying a new one.
            but thanks for the help

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            • #7
              It's kinda funny, I guess being brought up with polystyrene caps, whenever I'd seen these I had just assumed they too were polystyrene simply because they melt so easily. I see that a substitute is available, thanks HH. I have used acrylic SMD caps in some cases.
              Last edited by nickb; 09-19-2020, 04:27 PM.
              Experience is something you get, just after you really needed it.

              Comment


              • #8
                Originally posted by nickb View Post
                It's kinda funny, I guess being brought up with polystyrene caps, whenever I'd seen these I had just assumed they too were polystyrene simply because the melt so easily. I see that a substitute is available, thank HH. I have used acrylic SMD caps in some cases.
                My colleagues who designed automotive electronics favored polyphenylene sulfide (PPS) SMD caps for demanding applications.
                https://www.wima.de/en/our-product-r...of-dielectric/
                Last edited by Helmholtz; 09-19-2020, 05:25 PM.
                - Own Opinions Only -

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