Quoted from bonzo71:put the playfield back up and start looking for bent switches or broken wires anywhere that the playfield might have smashed into the cabinet
Good advice from bonzo71
Also, if the Credit Button doesn't activate the Credit relay, inspect and diagnose this circuit with Alligator clip jumper wires.
And the Pat Hand manual has a good description of the Reset Cycle.
https://www.ipdb.org/files/1767/Williams_1975_Pat_Hand_Instruction_Manual.pdf