Quoted from jellomandolin:It's the same problem as in reply #4. If the hundreds is at zero it works, once it gets to one, it runs with the tens reel
This sounds like a problem in the switch stack on the reel. There are three different configurations of the switches -- 0, 1-8, and 9. Sounds like, when stepping from 0-1, the 9 / runout switch is closing (and staying closed through 1-9) -- but it shouldn't close until you get to 9. With that switch closed prematurely, every time it advances from 1-9, it's pulsing the next reel to roll over.
Reference the info & pics here: http://www.pinwiki.com/wiki/index.php?title=EM_Repair#Score_Reel_Switch_States