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Mystery Component Challange

Discussion in 'General Electronics Discussion' started by biker1234, Jan 10, 2014.

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  1. biker1234

    biker1234

    4
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    Jan 10, 2014
    A challenge for you!

    My CDI unit for my motorbike has burnt out. I'm trying to discover the identity of component 'V1' (in top centre of PCB in image link below), so maybe I could get a new one to solder on. In this picture it is intact, but on mine it has burnt to a crisp...nothing is left apart from a small black disk.

    Any Sherlocks out there?

    [​IMG]
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,702
    2,717
    Nov 17, 2011
    I guess there should have been a picture? I can see only a circle with a slanted line through it. Your image is probably on a server that is not accessible by us.
    Tip: Go >advanced< and attach the image directly to your post.

    It may also help if you post the type and/or part number of the CDI unit.
     
  3. eem2am

    eem2am

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    Aug 3, 2009
    what is a CDI unit...anyway, ill say it may well be a varistor, as its "V"1.

    If it is , then you will have to solve whatever made it blow, not just replacing it
     
  4. biker1234

    biker1234

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    Jan 10, 2014
    Sorry heres the pic for you guru's out there. Thanks for quick reply!!!!
     

    Attached Files:

    Vishan malinda likes this.
  5. shrtrnd

    shrtrnd

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    520
    Jan 15, 2010
    Do you see any markings on the side of the device?
    Could be a cap, a resonator, an encapsulated anything else.
     
  6. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Varistor? Small one, posibly.
    Thanks Adam
     
  7. biker1234

    biker1234

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    Jan 10, 2014
    I no nothing about electrics- but if it's a varistor would that make sense why that one melted and others were fine? It took the hit and shunted to ground? What type could replace it? The board is for the bin unless fixed so what's the harm in trying something and connecting up? Will only melt the board right?
     
  8. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Yep.
    Adam
     
  9. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    The silkscreen marking reads C3, a capacitor.
     
  10. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I think that's the one below it.
    Thanks
    Adam
     
  11. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    You're right. It's a varistor.

    Note to users: rotate your blurry images right side up so the board markings are readable. :eek:
     
  12. biker1234

    biker1234

    4
    1
    Jan 10, 2014
    Ok, So the circuit board runs off a 12v 10A battery. Voltage goes up to around 16-18v when engine is running. What should I replace it with? A guess is fine.
    Also someone said something about what caused it? meaning a short in the wiring before the board? I'll go hunting.
    Thanks Einstein team!
     
  13. KJ6EAD

    KJ6EAD

    1,114
    159
    Aug 13, 2011
    Last edited: Jan 12, 2014
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