The reset position of the 100,000 unit is called the -1 position. At the start of a new game the 100,000 unit reset coil fires and its wiper disk unwinds to its -1 or reset position. The 10,000 unit should then advance (not reset) until it reaches its zero position. Once the 10,000 unit is back at zero the 100,000 unit takes a single step to its zero position and the game should be good to go.

During the reset sequence, a normally open (NO) switch on the U relay should close allowing pulses from a NO score motor 1A switch to get to the "Add 10,000 unit" coil. Since the U relay is firing, I'd check the NO switch on the U relay (slate-red to black-red wires) and make sure it's working properly.

/Mark

Ok, so the issue seems to be that the score motor isn't being run long enough to let the game finish resetting. Series switches on the U/Reset and S/Start relays both need to close to run the score motor, as does a switch on the Q/Dance At Reset relay. I wonder if the Q relay gets the motor started briefly as you observed, but that the series U and S relay switches aren't closing to keep the motor running.