I'm very good repairing any electronic machines, but with EM's still green.
I got this non-working for the horse mech alone, too cool to pass up. When I turned on, it would sit until I pressed start, then the motor would run constantly, along with the steppers, and the lights for the horse were changing continuously with this.
I cleaned all score reels, and found two that had misaligned 0 switches. I adjusted all these and cleaned them all, checked against others, all make contact and separate where applicable. After this, this seemed to calm things down, and all the steppers stopped, but the motor would turn off and on sporadically, but I could start a game and play, with the motor going off and on. Everything else seemed to work as it should.
Other than the motor, the only strange thing was the credit stepper/reel (not sure which it is). It would always want to turn to the highest credit count (until it reaches that max switch). If you click it anywhere from the last stop to no credits, as soon as the machine is turned on, it works it way around to the max position. Again, last night I could play it like this.
Today I read up and decided to try to work through it more. When starting it, all I get today is the motor running constantly when turning the machine on. I further cleaned all the score reels, score relays, the and 1st switch stack for the motor with the home switch.
Despite this, the motor still runs continuously, and the credit stepper always wants to keep itself at the max position, and both turn on right away (provided the credit stepper has been cycled back from the max position by me).
What else should I look at from here?