Carter Logan make sure that the nylon gears on the the sled drive are in good working order and do not have any broken teeth etc. Make sure they mesh. You also want to check for power on the motor. After that I suggest you check the schematics and measure the caps etc. After all, things are getting a bit weak after 30 years :-) and recapping might just be on order. Use this manual [document|27813]to help you with working on your console.