Magneti Marelli AEC 104B Ignition module | FerrariChat

Magneti Marelli AEC 104B Ignition module

Discussion in 'Australia' started by carl888, Feb 11, 2014.

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  1. carl888

    carl888 F1 Veteran
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    #1 carl888, Feb 11, 2014
    Last edited by a moderator: Sep 7, 2017
    Does anyone have a Magneti Marelli AEC 104B series ignition module spare, that is NOT working? (Boxer, 400i, Countach)

    I'm wanting to have a go at fixing one. The issue being that the circuit is potted in epoxy resin which makes access almost impossible. The deal, you'll either get it back working and go around telling everyone what a genius I am, or, in a huge mess (Probably the latter).

    Thanks for thinking of me, now please, have a look on your garage shelf and let me know if you find anything of interest!

    CJ
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  2. moretti

    moretti Five Time F1 World Champ
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    #2 moretti, Feb 11, 2014
    I saw one the other day :)
     
  3. carl888

    carl888 F1 Veteran
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    #3 carl888, Feb 11, 2014
    Thanks, did you pinch it for me, or did it appear remarkably like the one in the photograph!
     
  4. XTREMEIND

    XTREMEIND Formula 3

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    #4 XTREMEIND, Feb 11, 2014
    You still owe me a computer!!
     
  5. Aircon

    Aircon Ten Time F1 World Champ
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    #5 Aircon, Feb 11, 2014
    What's been seen can't be unseen.
     
  6. Gleggy

    Gleggy Formula 3

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    #6 Gleggy, Feb 11, 2014
    Already done it, what do you need to know??
     
  7. Gleggy

    Gleggy Formula 3

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    #7 Gleggy, Feb 11, 2014
    Last edited by a moderator: Sep 7, 2017
    Rebuilt Unit
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  8. F-Serge

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    #8 F-Serge, Feb 11, 2014
    you can have my broken door lock if you want :)
     
  9. Aircon

    Aircon Ten Time F1 World Champ
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    #9 Aircon, Feb 11, 2014
    Congratulations.
     
  10. carl888

    carl888 F1 Veteran
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    #10 carl888, Feb 12, 2014
    yeah, but I want to make it work :)
     
  11. simon klein

    simon klein Two Time F1 World Champ
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    #11 simon klein, Feb 12, 2014
    In that case fill it full of Toyota bits...
     
  12. carl888

    carl888 F1 Veteran
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    #12 carl888, Feb 12, 2014
    I'm basically curious about the two T03 cased transistors on the LH side of the board and whether yours had failed. Looking at the design of the unit, I think there will be a thermal overload problem in that area as the unit is potted. Can you recall if yours had the RCA39578 or 2N3773?
     
  13. Gleggy

    Gleggy Formula 3

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    #13 Gleggy, Feb 12, 2014
    Ask Horse!???
     
  14. carl888

    carl888 F1 Veteran
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    #14 carl888, Feb 12, 2014
    Thanks Sirgay. How is your fiance? She can visit any time (Not you though :)
     
  15. BlueBiturbo

    BlueBiturbo F1 Rookie

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    #15 BlueBiturbo, Feb 12, 2014
    Where can I rebuild an MM ECU ?
    Thanks
     
  16. carl888

    carl888 F1 Veteran
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    #16 carl888, Feb 12, 2014
    Well, you're hardly a paragon in information. That looks like a freshly zinc passivated case with some generic internals, the give away being the flying leads coming out of it. Did you squeeze an MSD unit in there?

    And what did you use to dissolve the potting?

    Come on, answer the hard questions!

    Like, did you rebuild the original unit!!??

    (It doesn't work does it??)
     
  17. carl888

    carl888 F1 Veteran
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    #17 carl888, Feb 12, 2014
    Are you still having issues with this unit Taffy? Can you let me know what's wrong with it?
     
  18. carl888

    carl888 F1 Veteran
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    #18 carl888, Feb 12, 2014
    Bend over, it's on the way!
     
  19. F-Serge

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    #19 F-Serge, Feb 12, 2014

    PP would be jealous - he thinks you two are in an exclusive "relationship"
     
  20. RPN

    RPN Formula 3

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    #20 RPN, Feb 13, 2014
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    I have this if you want; just waiting for pee pee to return it.
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  21. Aircon

    Aircon Ten Time F1 World Champ
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    #21 Aircon, Feb 13, 2014
    You said I could keep it.
     
  22. Horse

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    #22 Horse, Feb 13, 2014

    Wouldn't want to miss that. ;)
     
  23. alhbln

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    #23 alhbln, Jun 19, 2015
    (warming up an old thread)
    So did you succeed in fixing it?

    Both RCA39578 and 2N3773 were used depending on stock, you can still source 2N3773's for repairs. The potting is actually distributing the heat, also the unit is not getting that hot, so no worries about overheating.

    Most common defects are one or both of the 2N3773s are gone, broken wiring in the transformer, RCA Darlington NPN failure, BSW39 failure. Less often also the thyristor can fail.
     

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