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Thread: EMM Repair

  1. #1
    Tjdriver's Avatar
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    EMM Repair

    I took my EMM apart. I'm looking for methods of removing the potting material from the board so I can see if anything is fried, etc.....

    Anyone done this?

    I did a google search and lots of peeps say to use solvents and a lot say not too.

    I'm also curious on what board runs what on the ski since there are 2 boards in the EMM both with their own plugs.


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    Click avatar for tech links/info, donation request K447's Avatar
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    Click avatar for tech links/info, donation request K447's Avatar
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    I have yet to find a solvent that will dissolve or even soften the potting gel without risking damage to the electronics.

    I used mechanical removal methods only for the gel-free boards shown in my posts.

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    I did google thank you very much. And I searched here.

    I did see the first link, but not the second one.

    I'm slowing removing the gel with an acid brush. Teedius work.

    I found some equivalent caps online also so I'll most likely be changing out C86 even though it appears
    fine visually.

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Tjdriver View Post
    ... I found some equivalent caps online also so I'll most likely be changing out C86 even though it appears
    fine visually.
    Did you mean C89?

    Please link to the replacement capacitors you found.

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    Tjdriver's Avatar
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    Yeah, I was typing upside down. lol

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    Here is one site. I found some on Ebay also.

    http://www.surplussales.com/Capacitors/Electrolytics/10000uF-300000uF.html

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    Quote Originally Posted by Tjdriver View Post
    Here is one site. I found some on Ebay also.

    www.surplussales.com/Capacitors/Electrolytics/10000uF-300000uF.html
    The only cap that seems close on the linked list is
    (CFE) 010000R00AAH 10,000 µF 6.3v Axial Import 3/4" x 1-5/8"

    3/4" is a tad larger diameter than original part (which I measure as 40mm length x 16mm diameter) but 3/4" should still fit.

    "Import" probably means "China"

    Note the temperature specification on the original part. +105C down to minus 40C is the OEM cap in my example EMM. Many electrolytics are only rated for 85C.

    Axial seems harder to find than radial, that meets the specs.

    Since it is such a hassle to replace, and that C89 capacitor is critical to proper/reliable operation of the EMM, I would not go cheap. Look for high quality.

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    So far nothing visibly damaged or bad on the board. We are going to change out the C89 Cap and see if there is any change. My sup is a CB nut and had a couple of equivalent/better caps on hand.

  10. #10
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    Cap replaced. Now to test out the EMM tonight after work. If it works I'll be sourcing the potting compound and repotting the EMM. Fun.

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