Just try to see if the CPU boot,but it's without batteries.
It's on my bench and put it GND,+5V and +12V.Put and new batteries
Led's light but of course need to push backbutton from the coinddor-D21 and D20.
I'm sure that at this moment the machine is on factory reset settings and need to push backbutton on coindoor.
Can you tell me on which connector is this button and what I need to short to activate it?