(Topic ID: 252975)

Bally MPU’s suck


By oldschoolbob

7 months ago



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  • 24 posts
  • 13 Pinsiders participating
  • Latest reply 7 months ago by oldschoolbob
  • Topic is favorited by 1 Pinsider

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    #1 7 months ago

    I picked up a couple of MPU 100’s that needed some work. (one Stern and one Bally). I worked on the Stern first because it was in the worst condition. I had no problem replacing the headers. Today I started on the Bally. When I removed the headers I lost over a dozen solder pads. The lost pads were not connected but they just fell off. I’m not sure but I don’t think the holes on the Bally boards are plated on the inside.

    Now I got a bunch of stitching to do.

    Bob

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    #6 7 months ago

    Levi, I hope we don’t throw out everything that’s over 40 years old and past their service life because that would include me.

    Besides I didn’t get these for a game – I got them to rebuild. I enjoy fixing them.

    Upon closer inspection it looks like just the solder broke away from the solder pads and stuck to the bottom of the headers.

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    However, I still lost several pads.

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    It looks like the lost pads are from places that no traces were attached. (like key pins). But I did lose a couple of pads on the top of the board that will require some stitching.

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    Do you just not solder the key pins where they lost the pads?

    #11 7 months ago

    I guess I was a little harsh. Maybe a little disappointed because I always found Bally boards were better built (especially their solenoid driver boards). Might be me or my equipment but I didn't loose a single pad working on the Stern board.

    I'd love to have one of those Pace systems but WOW. That's professional equipment. I'm just a hobbyist.

    At least this repair work will keep me busy for a while.

    Bob

    #14 7 months ago
    Quoted from Daditude:

    These have been around for decades. It's time for a new board.

    I hope my wife don't feel that way about me.

    Thanks Quench. That's what makes this hobby so great. Some like to fix them and other like to play them.

    Bob

    #18 7 months ago
    Quoted from Daditude:

    I just don't think that saying they "suck" after decades of use accurately portrays their quality. Just my opinion.

    As I said in post #11, I may have been a little harsh. I apologize for that.

    slochar and frunch - I read that post recently about removing the housing and found it very interesting. My method is similar. First I use my desoldering tool and as someone said most of the time the headers will just fall out. If they don't then I pry off the plastic housing and remove the remaining pins one by one as you suggested. However, on this board I had a lot more pins that stuck to the board. Maybe I need more heat on the Bally boards. But it seems more heat causes the pads to fall off - especially the pads that don't have a trace attached. Seems to be a careful balance between heat and time on each pin.

    All the pads I lost on this board did not have a trace attached but I didn't loose a single pad on the Stern board. That's the reason for my rant in the first post.

    Bob

    #24 7 months ago

    That's a great photo showing the ware on the headers. I change headers as standard procedure. Also change crimp connectors. I don't like chasing down connector problems.

    Maybe now they'll last another 40 years.

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