Twilight Zone - upper left flipper & CPU board

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Kurt Freund

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Jul 22, 2021, 4:36:27 PMJul 22
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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?

John Robertson

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Jul 22, 2021, 5:40:29 PMJul 22
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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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