(Topic ID: 258506)

DMD Unregulated power issues

By Hop721

2 years ago



Topic Stats

  • 10 posts
  • 3 Pinsiders participating
  • Latest reply 2 years ago by PinballManiac40
  • No one calls this topic a favorite

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    #1 2 years ago

    My Color dmd is freezing On my RBION when trough coil fires and coil power is set to normal. This does not happen when coils are set to soft.
    I assume this is because of a power surge through the 12v power connection near the coin door.
    Anyone know how to regulate that source (inline or otherwise) or a better power take off point?
    Game doesn’t play well when coils are set to soft.
    Appreciate any help.
    Ripley's Believe It or Not!

    #2 2 years ago
    Quoted from Hop721:

    My Color dmd is freezing On my RBION when trough coil fires and coil power is set to normal. This does not happen when coils are set to soft.
    I assume this is because of a power surge through the 12v power connection near the coin door.
    Anyone know how to regulate that source (inline or otherwise) or a better power take off point?
    Game doesn’t play well when coils are set to soft.
    Appreciate any help.
    Ripley's Believe It or Not!

    Rebuild your 5V and 12V sections on your driver board. Particularly the 15,000 farad caps on each.

    #3 2 years ago
    Quoted from DRDAVE:

    Rebuild your 5V and 12V sections on your driver board. Particularly the 15,000 farad caps on each.

    I’ll research how to do that and dive in if I’m comfortable with it. Kind of a noob at soldering, but willing to learn. Any good instructional resources you recommend?
    Thank you!

    #4 2 years ago
    Quoted from Hop721:

    I’ll research how to do that and dive in if I’m comfortable with it. Kind of a noob at soldering, but willing to learn. Know of any good instructional resources?
    Thank you!

    #5 2 years ago

    It can be a difficult solder repair for the noob as you can pull the "tube" connecting the top side to bottom side of the board when desoldering the 15,000 farad caps involved. Best to send it off to one of the board repair people that post around here.
    Clive at Coin Op Cauldron and Chris Hibler among others that could help with this.

    #6 2 years ago
    Quoted from DRDAVE:

    It can be a difficult solder repair for the noob as you can pull the "tube" connecting the top side to bottom side of the board when desoldering the 15,000 farad caps involved. Best to send it off to one of the board repair people that post around here.
    Right on. Thanks for your help!
    Clive at Coin Op Cauldron and Chris Hibler among others that could help with this.

    #7 2 years ago
    Quoted from DRDAVE:

    It can be a difficult solder repair for the noob as you can pull the "tube" connecting the top side to bottom side of the board when desoldering the 15,000 farad caps involved. Best to send it off to one of the board repair people that post around here.
    Clive at Coin Op Cauldron and Chris Hibler among others that could help with this.

    Right on. Thanks for your help!

    #8 2 years ago

    Try reseating the ribbon cable and the IDC and molex cables along the bottom of the CPU board and along the top of the driver board. The regular cables are power connectors.

    #9 2 years ago
    Quoted from PinballManiac40:

    Try reseating the ribbon cable and the IDC and molex cables along the bottom of the CPU board and along the top of the driver board. The regular cables are power connectors.

    I’ve Replaced ribbon cables, cleaned and reseated all connections. Didn’t Seem to help, unfortunately
    Only (And almost always) seems to happen when the trough upkicker fires out a ball (coil power set to normal)

    #10 2 years ago

    Can you measure the resistance of that coil? Diode is attached and soldered on both ends?

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