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(Topic ID: 275095)

WPC Sound board fault


By Pinballer73

70 days ago



Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 70 days ago by Coyote
  • No one calls this topic a favorite

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    #1 70 days ago

    Rebuilding a project BSD and a few seconds after power up the Sound board sizzled, sparks then a small drift of smoke before I had time to reach down and switch the power off.

    On closer inspection I found C46 has blown as shown in the photo. Any ideas what might have caused this?

    Lower cabinet speaker was unplugged at the time. Rest of the game appeared to boot fine.

    The board was supposedly ok, but was untested by me. I have another in a working game, but don't want to install that until I can be sure it's not related to this machine. Supply voltages to the sound board all checkout ok.
    20200813_163116 (resized).jpg

    #2 70 days ago

    Old tantalum capacitors sometimes short and explode. Probably nothing wrong with the board. If supply voltages are correct, just install a new capacitor. Maybe it would be a good idea to replace all tantalum caps.

    #3 70 days ago

    Ok, I'll give that a try, thanks. Anyone have a list of which caps to replace on this board?

    #4 70 days ago

    Just had another look and my aging eyes let me down, it was C46 that blew, not C45 as originally stated in the 1st post. That's been edited now.

    Looks like there are two types of tantalum caps as listed in the manual. 1uf and 10 uf. Will have to order some.

    Screenshot_20200813-182654 (resized).jpg
    #5 70 days ago

    That explains why my schematic shows C45 as a 22pF

    Get 35V caps when ordering.

    #6 70 days ago
    Quoted from Tuukka:

    That explains why my schematic shows C45 as a 22pF
    Get 35V caps when ordering.

    Will do, thanks for your help! Hopefully nothing else on the board was damaged.

    #7 70 days ago

    Yeah, those Tant caps go in a blaze of glory when they do. I just lost one off the sound board in my TZ last week.

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