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(Topic ID: 242890)

Voltages on Test Points of WPC Power/Driver Board?

By PolePosition

1 year ago

Topic Stats

  • 6 posts
  • 5 Pinsiders participating
  • Latest reply 39 days ago by Billc479
  • Topic is favorited by 1 Pinsider


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    #1 1 year ago

    I was curious what is the normal voltage range to expect for the various test points of a Williams WPC power/driver board?
    I have a working White Water game, and was doing some work on it over the weekend and thought I'd check the test points to get an overall sense of its health. Here's what I have:

    TP1 (+12v unregulated): 12.6v
    TP2 (+5v): 5.09v
    TP3 (+12v regulated): 11.9v
    TP6 (+50v): 69.1v
    TP7 (+20v): 19.5v
    TP8 (+18v): 16.2v

    I did not see this discussed in pinwiki, but may have missed. Any information is greatly appreciated.

    #2 1 year ago

    Yours look good. 50 volts is always high not under load.

    LTG : )

    #3 1 year ago

    Is there a max/min range to consider for each TP where problems start to pop up?

    I know TP2 is an issue if less than about 4.6v as it causes game resets, but with the other TP's, do you see performance changes if out of range, ie dimmer bulbs, weaker flippers, etc?

    #4 1 year ago
    Quoted from PolePosition:

    I know TP2 is an issue if less than about 4.6v as it causes game resets

    Actually anything less than 4.85v will cause resets in WPC games. Less than 4.8v, a WPC may not even boot.

    1 year later
    #5 39 days ago

    Dc volts correct?

    #6 39 days ago

    Yes to the dc question

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