I have a crain machine that I'm am trying to work on. The marquee lights are controlled by its own board. I was able to figure out how to power the board and get the lights to function. There suppose to be different patters but I can't figure out how to change them. There is a connection that connects to pin 5 of a CD4075BE. I'm unable to figure out what type of signal it uses. It's the left pin on the connector. Can anyone help me to figure it out? I've attached pictures and what is supposed to be the schematic for the board.
Thank you
Thank you
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