Smart Ball (skeeball) Owners - Quick Question on Wiring

acebh

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Smart Ball (skeeball) Owners - Quick Question on Wiring

I have a Smart Ball alley with a plasma / dot matrix display. I'd like to know if the harness attached to J4 on the power supply goes to CPU Board J7....... or Driver Board J8. The manual seems to have some conflicting information with power inputs to the boards.. some of it references +16v unregulated going to both the CPU board and Driver board.. other places it has 12v regulated DC going to the CPU board. Troubleshooting information non-working audio in the manual says CPU board should get +16v unregulated, yet the CPU board has 12v marked on the board. Initially I was thinking the harnesses might have been wired wrong from the factory, but now thinking it might be that they used a power supply on multiple machines and maybe on these alleys the regulated/non-regulated DC didn't matter.

I've attached a picture for comparison.

Any help is appreciated!

-Wayne
 

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