Quoted from Galacnor:The motor in the middle of the cabinet spins continuously, and two of the solenoids in the head fire in rhythm,
Are those the 1st and 2nd player score reset relays that are chattering in the back? If so, you have to clean and adjust the switches on the reels, esp. the '0' switches. The motor will run until they reset.
Read more here: http://www.pinrepair.com/em/index2.htm#reels