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MMRLE VUK/Coil issue?

Discussion in 'Pinball Tech Support' started by Golden Graham, Sep 15, 2020 at 10:36 AM.

  1. Golden Graham

    Golden Graham Active Member

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    Haven't posted in a while...in fact, haven't even turned my machine on in a while! I did today, it has roughly only 350 plays on it.
    During my first game, my ball went into the moat trough and the VUK wouldn't kick it up. When the machine attempted to look for the ball, that coil wouldn't fire when all others would? Cannot figure out why? Everything is pristine and rarely even used. Any ideas as what I might be looking at; and perhaps some steps to solve it? All connectors are seated properly (pretty sure they are on the blue board above the moat).

    Thanks
    Kyle
     
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  2. Mike Gratton

    Mike Gratton Member

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    Check that the coil has both wires still attached.

    Re-seating the connectors is usually the first step (after you confirm the wires are still soldered to the coil). You may need to put foam or other material under the large board to prevent it from flexing as you re-connect the connectors.
     
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  3. Golden Graham

    Golden Graham Active Member

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    All wires are perfect. Board has perfect seating. I am confused!
     
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  4. Mike Gratton

    Mike Gratton Member

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    Did you physically re-seat the connectors or did you just look at them? It's a known issue. Remove connector and re-connect.
     
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  5. Golden Graham

    Golden Graham Active Member

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    Physically re-seated. But I will do it again.
     
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  6. Golden Graham

    Golden Graham Active Member

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    I think I found the problem...it was a total NOOB problem. I had a blown F1 Fuse (4A) on the blue circuit board. I haven't replaced it yet as I don't have any, but I guarantee that is the problem.
    Thanks for the suggestions though!!

    Kyle
     
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  7. sylvain

    sylvain Active Member

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    Can we assume that F1 is a slow-blow fuse? Probably is my guess.
    The other question is why that fuse blew in the first place.

    If it blows again after replacement with a proper-rated fuse, then it could be the
    drive (transistor/snubbing diode across the coil which might be located on a board).

    Good luck!
    -Sylvain.
     
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  8. Golden Graham

    Golden Graham Active Member

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    Sylvain, It blew again right away.

    What should I be looking at? I don't really understand...
     
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  9. sylvain

    sylvain Active Member

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    Looks like there is a short to that line, or most likely the associated drive transistor (to this specific VUK coil) is shorted on the driver board.
    You will need the game manual and a Digital multimeter to identify the bad part(s) first, then obtain a proper replacement, and replace it.
    Soldering will be involved. Hopefully those are not surface-mount components. You might need to hire a good experienced tech if this is still cryptic/unclear to you. Note that there are quite a few web sites out there on how to test drive transistors, etc.

    Alternatively, perhaps this new game is still under some kind of warrantee and/or the manufacturer might offer free tech servicing over the phone or email? Or a replacement board? Something to check before starting troubleshooting...

    Best of luck!

    Regards,
    -Sylvain.
     
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  10. Golden Graham

    Golden Graham Active Member

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    Thanks for the input.
    I am sure there is no warranty, but I contacted Chicago Gaming anyway. I don't mind buying a new board as I truly suck at fixing boards. I have the game manual, but I really don't know how to read the schematics. So weird how this happens when the game has literally been off for months. I was going to take pics to sell it and decided to play a game...of course something had to go wrong! lol.
     
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