(Topic ID: 289677)

BK2K System 11 power supply no 12vdc

By ArnieC

7 months ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 7 months ago by G-P-E
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    #1 7 months ago

    67FD3F71-752D-4EC9-BB14-272DC7AAA40A (resized).jpeg234F3F31-0AA5-4D95-A8E7-171E7F41A61F (resized).jpeg67FD3F71-752D-4EC9-BB14-272DC7AAA40A (resized).jpegI can not figure out why my 12volt is running about 9volt on my system 11 power supply for my Black Knight 2k. I replaced all the capacitors, I put in a new 2n2059 transistor. I know it is the power supply as I plugged in a working power supply and the voltages correct on it. I have 13.89vdc at D1 and D5. What I don’t have is continuity between the + leg of the bridge rectifier and D1 and D5 that is there on the working board. I replaced the bridge rectifier as well

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    #2 7 months ago

    Dang. Double check all of your work. Did you use the right transistor? Some of them have to have the legs twisted.

    https://troxelrepair.com/product/williiams-system-3-11c-high-voltage-pinball-repair-kit/

    #3 7 months ago
    Quoted from donjagra:

    Dang. Double check all of your work. Did you use the right transistor? Some of them have to have the legs twisted.
    https://troxelrepair.com/product/williiams-system-3-11c-high-voltage-pinball-repair-kit/

    High voltage repair kit does not include any parts related to 12Vdc.

    #4 7 months ago

    Do you have the original 2n2057/2n2059 to put back in the board to see what you get? I think the new 2n2059 is lower for some reason. Where did you buy it from? Seems like a potential fake part.

    I understand there is resistor that can change that can bring up the 12v. It was mentioned on a pinball repair FB group last year. I should have saved that info.

    #5 7 months ago

    I do not remember where I got the 2n2059. I think Jameco I have some of the NTE equivalents I can try. I will report back

    #6 7 months ago

    Yeah....I got many of fake 6821 parts from there.

    #7 7 months ago
    Quoted from ArnieC:

    I do not remember where I got the 2n2059. I think Jameco I have some of the NTE equivalents I can try. I will report back

    Use a 2N6284 -- those are still made.

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