Hi Rolf thanks for the help,. I have enjoyed reading your replies to others on troubleshooting through schematics and hands on testing of the circuits. To answer your question, when I 'pushed' the motor forward it did rotate one third of a turn to the next stop point.
I have attached a snippits of the Top Score schematic, Ball Return 'O' RELAY circuit and the Ball Return Coil circuit.
Proir to my posting I connectivity tested all of the switch connections in the chain required to energize the Ball Return 'O' relay. All of the switches and connectivity in the 'O' relay circuits proved to be of good connection. When connecting the 'O' relay directly to the 25v source the relay worked, when manually actuating the 'O' relay, the Ball Return Coil energized and kicked out the ball, at first I did not understand the difference between the Ball Return relay and the Ball Return coil. When I did come to understand I then investigated that circuit including the 4C motor switch. All was good. At this point I am frustrated and posted my problem
After posting and seeing my issue written in front of me the idea of 'could the motor be stuck mechanically?' floated up. That research led my to the pinwiki page on Servicing and lubrication of the score motor. A few dozen q-tips and lots of careful cleaning with alcohol of all the working surfaces of the motor. Then a light lube using superlube of the working surfaces and a drop of 3 in 1 oil in the oil hole.
Voila it works.
This may have been a very frustrating process for me doing it the hard way but what I am taking away in experience is priceless!
Thanks again!
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