Demolition Derby -wireing diagram

digitaldocc

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My 2 player demolition derby has graphic glitches whenever the 2nd player turns the wheel. I ruled out the wheel encoder by swapping connections to the known working player 1 wheel.

Currently the pcb is out on repair but the technician needs the wiring diagram to fix the issue. My problem is the manuel says that the wireing diagram is not available at the time of this publication and that it will come out in a service bulletin.

Does anyone actually have this wireing diagram or a link to the updated service bulletin?
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To the best of my knowledge, there isn't a cabinet wiring diagram for Demo Derby. The pcb is a standard mcr3 though, unless its a monoboard version.
 
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