Ok, coin door wiring is all orange/xxx and grounded (black). Check continuity for the ground wire going to all the switches on the coin door. Wires pass thru the 14689 coin door interface board. If your not getting a switch to work after checking to make sure the grounds are all ok, check to make sure the continuity from the switch back to the J205 connector on the CPU board is good. If you can't get it into test mode to set it for free play, or to credit a game using the coin switches, the start button won't light up.
Or/brown left coin pin 1 J205, then goes to U17 pin 5
Or/red center coin pin 2 J205, then goes to U17 pin 7
Or/black right coin pin 3 J205, then goes to U17 pin 11
Or/green test credit pin 6 J205, then goes to U16 pin 9
Or/blue vol down pin 7 J205, then goes to U16 pin 11
Or/violet vol up pin 8 J205, then goes to U16 pin 7
Or/grey enter test pin 9 J205, then goes to U16 pin 5
Black ground pin 10 J205, grounded on board
Or/white enable pin 12 J205
Put the game into test, run it thru the tests, note the closed switches, see if any are stuck...
Start button (switch test 13) White/Orange pin 3 J208, then goes to U18 pin 5, and Green/Brown pin 1 J206, then goes to U20 pin 18.
Credit button light (lamp test 88) Red/Gray pin 9 J133, then goes to Q83, and Yellow/Gray pin 9 J138, then goes to Q91.
If your getting the lamp strobes on the games start up, displays cycling and coils firing in the test mode, seems like it's getting power.
Ok, so did I miss anything?