Twilight Zone - upper left flipper & CPU board

[Kurt Freund]

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]

Post by Kurt Freund
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 :-#)#