Quoted from rvdv:
Any one know what this is for or how to make it
Work for 110 volts instead of 220 v ?
It looks like a stepdown transformer and a rather small one for this application.
Does the game have the original Bally transformer on the large metal power module? If yes you can bypass that stepdown transformer - just make sure the original Bally transformer is wired for 115V - see the below picture of the voltage selector jumper block located next to the main transformer.
NOTE, you will need to change the red varistor shown in your second picture with one of these:
And change the inline EMI filter for one capable of higher current: