OP

Quoted from mpschuetze:

Hello everyone, first time poster. I have a 1974 Strato Flite. I've fixed a broken flipper, replaced lamps, replaced rubber, cleaned and polished the playfield, and today the game is very usable. However I have one flaw that I don't know how to tackle, so hopefully you can help guide me. At the top of the playfield is the ejection saucer and left and right slingshots. My problem is the slingshots are not advancing fully. They do increase the bonus, but they don't advance the five different bonus options. Only the Open Bottom Gate light remains lit as the sole option no matter which slingshot is hit. I have a feeling this is a bad stepper unit, but I don't know which one, nor have I replaced/serviced a stepper before. I have the Strato schematics. Can anyone confirm on the the right track? Any resources on fixing or replacing steppers is well appreciated too. Thanks. Matt