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(Topic ID: 276948)

Capacitor(s) connected to bridge rectifier(s) in Black Knight

By Kramertheman

3 years ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by slochar
  • Topic is favorited by 1 Pinsider

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    #1 3 years ago
    OP
     
    FTC

    Kramertheman

    Pinside member

    US Harrisburg, PA

    8y 26,150 28

    I have a Black Knight that I just started working on recently. There is a big blue capacitor attached to the Bridge Rectifier for the lamps. What are the chances this needs to be replaced? How do I test?

    The second and more puzzling question is does the bridge rectifier for the solenoids need a capacitor attached? My game has a silver radial capacitor attached attached to the solenoid/flipper circuit. The capacitor is attached but it is just lying on the bottom of the backbox, sort of like it was installed as an afterthouht.
    Definitely doesn't look "factory". I have never heard of this before. Why would someone install this capacitor? Should I leave it or should I remove it? How do I know if it is good? Will there be a value or part number printed on it?

    The MPU and driver are out of the game right now. It did work but there were a few issues. There was a problem on the Driver board that controlled the magnasave. I also wanted the battery pack removed from the MPU and NVRAM installed.

    Any help is greatly appreciated.

    Kramertheman

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    #2 3 years ago
     
    ZAC

    zacaj

    RPC

    US Rochester, NY

    11y 158K 10,387 85 122 1

    A cap attached across the DC terminals of the solenoid bridge rectifier will give the solenoids more power. There's one on the power supply, but it's just 100uF, which doesn't have much affect on the power. What value is the capacitor that's connected to yours? It should say on it somewhere. If it's higher value, it could be there to make the game play faster, or if it's just ~100uF maybe they didn't feel like doing board work...

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    #3 3 years ago
     
    ???

    KenLayton

    In Memoriam

    US Olympia, WA

    12y 83,400 5,965

    You need this board to replace that giant capacitor, the two bridge rectifiers, and add fuses that the factory left out:

    http://home.kpn.nl/inkochnito/bridge_board.htm

    Once installed the backbox will be cleaner and you won't have to worry about your house burning down from a shorted rectifier.

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    #4 3 years ago
    OP
     
    FTC

    Kramertheman

    Pinside member

    US Harrisburg, PA

    8y 26,150 28

    The cap across the dc terminals of the solenoid bridge rectifier is labeled 5000 mfd 50 vdc axial mallory

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    #5 3 years ago
     
    ZAC

    zacaj

    RPC

    US Rochester, NY

    11y 158K 10,387 85 122 1

    OP
    Quoted from Kramertheman:

    The cap across the dc terminals of the solenoid bridge rectifier is labeled 5000 mfd 50 vdc axial mallory

    that's a big one... basically high tapping all the coils. Not factory

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    #6 3 years ago
     
    237

    slochar

    Pinside member

    7y 86,550 6,907

    OP
    Quoted from Kramertheman:

    There is a big blue capacitor attached to the Bridge Rectifier for the lamps. What are the chances this needs to be replaced?

    If the lamps light bright as they should without pulsing it's fine. That cap almost never needs to be replaced.

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