If your AA/Left Roto Target Relay closes when you hit the left Roto Target switch and stays closed until the Score Motor stops I'd say it's probably working as it should. You can compare it to the CC/Right Roto Target relay which should behave the same way when the right Roto Target switch is hit.
You may need to have a close look at your Roto Target wipers:
Jet Spin Roto Target 100 points (resized).jpg
The way this should work is that when the Roto Target is hit, the Score Motor starts and the Score Motor 1A switch in the bottom right closes 5 times before the Score Motor stops, sending 5 pulses into the circuit. The 5 pulses get to the #5 and Star position contacts on the Roto Target (there are three contacts each for the other 4 positions too.)
The five pulses also try to get through the normally closed Score Motor 4C switch. All but one get through since the 4C switch opens during the 5th pulse, so only 4 pulses get to the #4 position contacts on the Roto Target. So 4 pulses get to each of the #4 position contacts on the Roto Target.
The 4 pulses all try to get through the Score Motor 1B switch but only three get through, and so on until only 1 pulse gets through the four normally closed Score Motor Switches. So each contact on the Roto Target gets a number of pulses indicated by it's position.
When the left Roto Target is hit and the AA relay fires, the M/100 point relay should get a number of pulses based on which contact the left Roto Target is touching. It sounds like the left Roto Target is off by one, and may be shorted to the center Roto Target. (Does the left target always score what the center target shows?)
In any case, look carefully at what the left Roto Target wiper is touching on the contact board. It sounds like it's off by one contact, or perhaps it's shorted to the center target wiper and not touching any contact by itself.
/Mark
Pottstown, PA
