(Topic ID: 228898)

Still looking for ideas to diagnose switch fault (Bally)


By swampwiz

8 months ago



Topic Stats

  • 13 posts
  • 7 Pinsiders participating
  • Latest reply 8 months ago by Quench
  • Topic is favorited by 2 Pinsiders

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    #1 8 months ago

    I had an earlier post about this, but that looks to have died, and I have some new information, so I figure I'll try again. The title is Playboy.

    So for the test, there is a switch showing a fault. I've cut both the diode & capacitor off, and have even separated the switch stack, and it's still showing fault!

    The only thing I can think of is to look at the switches that are along the 2 inputs lines and look for a short, and after that, start cutting the diode & capacitor for all the switches that are on either of the input lines. What else can I try?

    #2 8 months ago

    i would unplug the connector at the mpu to verify its not a board problem first, and if its not a board problem i would start looking for shorts in the harness/wiring or at connections anywhere a wire could short to ground - should be fairly simple to locate

    #3 8 months ago

    Really curious about which switch is showing what error.
    Cut the switch out of the matrix, is the error gone? If so, replace the switch, if not, isolate the whole matrix like Kenny suggested.

    #4 8 months ago

    Which playboy?

    #5 8 months ago

    You need to be more clear which game you are talking about. Your post title says Bally so I'm assuming this is the 1978 Bally Playboy??
    Please identify the switch and what you mean by error? Are you saying the switch shows up in switch test as being stuck closed?
    Since you tried cutting off the cap, what happens if you remove the wires from the switch?

    In general you have either a shorted switch stack or the strobe or return wire for that switch is shorted. Unsoldering the wires from the switch will help narrow that down.
    Knowing which switch will help with trouble shooting too.

    #6 8 months ago
    Quoted from zacaj:

    Which playboy?

    Bally

    #7 8 months ago
    Quoted from BigAl56:

    You need to be more clear which game you are talking about. Your post title says Bally so I'm assuming this is the 1978 Bally Playboy??
    Please identify the switch and what you mean by error? Are you saying the switch shows up in switch test as being stuck closed?
    Since you tried cutting off the cap, what happens if you remove the wires from the switch?
    In general you have either a shorted switch stack or the strobe or return wire for that switch is shorted. Unsoldering the wires from the switch will help narrow that down.
    Knowing which switch will help with trouble shooting too.

    The switch is #40, left thumper. When playing, it seems to work fine.

    #8 8 months ago

    SOLVED!

    Evidently, what is "left" on the schematic is from the perspective from the back of the machine. The "left", from the perspective of the player, thumper has the wiring for the "right" and vice-versa. So I cut the capacitor for the "schematic 'left'" and inserted a new capacitor - while reconnecting the diode & capacitor for the "schematic 'right'", which I had originally cut. Now all I have to do is solder it all back.

    #9 8 months ago

    Please tell me the wire colors for both sw 39 and sw 40.
    I'll change them accordingly on my Playboy Tech Chart.

    #10 8 months ago
    Quoted from swampwiz:

    SOLVED!
    Evidently, what is "left" on the schematic is from the perspective from the back of the machine. The "left", from the perspective of the player, thumper has the wiring for the "right" and vice-versa. So I cut the capacitor for the "schematic 'left'" and inserted a new capacitor - while reconnecting the diode & capacitor for the "schematic 'right'", which I had originally cut. Now all I have to do is solder it all back.

    That's usually not how it works, FYI. Maybe a schematic error or wiring got messed up previously.

    #11 8 months ago

    Would it be possible to exchange the pop bumper assembly left and right?
    That would explain this situation.

    #12 8 months ago

    It could very well be that I was the one that swapped them, as I had redone the the pop bumpers and a complete playfield swap - as well as possibly a screwup at the factory. I have them in their proper location now. But if I were someone with a Playboy, I'd definitely take a look at the wires to see if they are also screwed up.

    #13 8 months ago

    The schematics and manual are correct.

    On my Playboy, the left pop bumper is switch 40 and the switch wire colors are yellow-red for the strobe wire and orange for the return wire.

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