I was troubleshooting some lighting issues with my Gottlieb Spin-A-Card. I had the playfield up, so no ball in outhole. Reset game but didn't trigger the trough switch to advance ball count unit to ball one. Shut off machine and hit replay button to restart and got nothing. With or without a ball in the outhole. The only way to get it to start was by advancing the ball unit off of the zero position. Then everything works fine.

I realize that normally there will be a ball in it, which would kick across the trough switch and advance the ball unit, but is it supposed to not start if the ball count unit is in the zero position?

The schematic shows an open switch at the zero position and the only other path is through the tilt relay.

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I thought this might be the case. Makes perfect sense. Except that I never noticed it happening on other Gottlieb games. If I tilt it, I can get it to reset because it now goes through the closed switch on TB. So I compared it to my Big Brave and there is a similar open switch at Ball Count Zero Position shown on the schematic. But if I hit the replay button on Big Brave (at zero ball count) it will start a game. Difference is when I power Big Brave back on, it is in Tilt mode but Spin-A-Card is not.