Where to get schematic info on Logitect Space Invaders cocktail table

[paulo2]

Hi,

Can anyone help? I require some info on Logitec Space Invaders(bootleg) Cocktail table.
  I am having problems with the game not starting. Only get a grid on the screen. Have no pin outs or schematics. I have seen the info for the Taito machine, but not the same pin outs. I am at a loss. Need to check the basics first to start to solve this problem.
  I believe this to be a rather rare cabinet(maybe not sort after). So any help would be appreciated.

Thanks