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  • Twilight Zone - upper left flipper & CPU board

    From Kurt Freund@21:1/5 to All on Thu Jul 22 13:36:21 2021
    I had to replace the backup battery holder on a Twilight Zone CPU board. That worked fine, but now the upper left flipper stays up in the activated position... it goes up as soon as I turn on the power. It seems like I must have shorted something out on
    the CPU board when I was soldering the battery holder, but I can't find it. Can anyone help?

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  • From John Robertson@21:1/5 to Kurt Freund on Thu Jul 22 14:40:15 2021
    On 2021/07/22 1:36 p.m., Kurt Freund wrote:
    I had to replace the backup battery holder on a Twilight Zone CPU board. That worked fine, but now the upper left flipper stays up in the activated position... it goes up as soon as I turn on the power. It seems like I must have shorted something out
    on the CPU board when I was soldering the battery holder, but I can't find it. Can anyone help?


    Check the ribbon cables that go from the top of the MPU board to the
    other boards. I expect you will find one is offset either one or two
    pins - either sideways or up/down.

    Happens to all of us every now and then!

    John :-#)#

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