The center rollover switch always trips the 500 point relay. However it will not score 500 unless the RO relay in the trip bank is already tripped. Then it scores 200.

Check the center rollover switch to see if when closed it trips the 500 point relay. If the 500 point relay does not trip it will not score at all.

Open the game up and hit the rollover switch and see if the 500 trips. If not it's a switch problem or the trip coil on the 500 point relay is not energizing. It could be that it is tripping but the switch in the 500 point relay is not quite making

Nor a double switch. It's a single switch.

Timing between the 500 point relay and the score motor. Whe the rollover switch makes it trips the 500 point relay. When set for 200 points after 200 is scored a combination of a make/break on the RO relay and a motor 2A relatches the 500 point relay and stops scoring after 2 lobes on the cam have pulsed the switch.

When set for 500 points the RO relay changes state and now it is a combination of the make/break on the RO relay and a motor 5A. The motor 5A lets the 500 point relay stay tripped long enough for 5 pulses on the impulse cam to score 500 then it relatches the 500 point relay and scoring ends.

If the ball gets stuck on the rollover switch it will score 200 then 500 over and over.

Pure genius in design here.

Lift the playfield and close the switch. What does the 500 point relay do? It should trip.

If it doesn't then check the resistance of the trip coil on the 500 point relay.

Manually trip the 500 point relay. It should score 200 points. If it doesn't make sure the switches on the relay are clean and making good contact.

This is not a complex circuit.

By trip it you mean the trip coil?

Did you check the resistance of the trip coil and check the power wires at the solder lugs?

There is only one switch that trips the trip coil. Jumper from it directly to the coil.