I have a Bally Circus which is the four player version of this game. Love the art work and family theme of this game. Currently mechanically restoring a Gottlieb Target Alpha. As you may know Pinball Machines can be a real challenge as they have many switches and moving parts. I recommend going to pinrepair.com and reading Clay's document on EM repair.
My experience with twelve EM games of all varieties and my recomendation is as follows:
1. Replace the cord unless this has been done already. Can easily blow any fuse.
2. Check fuses or fuse holders...Bally made their own connectors and holders and they were of very poor quality - so new holders are not so far fetched and a good purchase for any EM game. Make sure you use the correct fuses. Pinball Resource or Marcos. Radio Shack if you don't want to wait. Do not use automotive fuses they're not adequate for this purpose. Look at it this way if something is wrong they don't blow your game can catch on fire.
3. Your ball count and player step units and all the moving parts and pivot points need degreased. Printed circuit boards where the fingers ride need to be sanded with 400 grit sand paper, cleaned with 91% alcohol, and lubed lightly with PTFE (can fin this in pen form at Radio Shack and it lasts a very long time). If your step units don't move freely the game will never work. Do NOT use WD40, white lithium, or any contact cleaner you could catch the game on fire.
4. Clean your Jones connectors with a piece of sand paper. Good connections are key.
5. Make NO switch adjustments unless something is really out of place as you can create more problems. I typically do this last if needed.
6. Patience - Everything in an EM game must work in harmony to work right. I dread my future move from my house less than a mile away, to my new condo as it may cause me to mechanically restore all of my games again.
There's an EM section of this message board thats geared more for this type of game. You can PM me with questions if you'd like. Good luck in your restoration of this game...OHEMIO