Everything works perfect however every time I add a quarter to the coin door the stepper motor subtracts a game instead of adding a game. Has anyone ever come across this problem? The game allows credits to be added when you win a game or match but for some reason if you add a quarter it takes away a game. I can manually add a game by pushing the plunger of the coil in the rear of the head . Any ideas?

Added over 7 years ago:

Got the game about 10 years ago and have not touched anything...decided to look at all the bugs and see if they could be corrected...yes the stepper unit was touched before I got it....2 new wires installed...appear correct...ratchet was lubricated...and some fine adjustment with 2 screws was performed.....coin adjustments in door register but I can only see the 2.

This sounds quite possible....Inspected everything...I'm a mechanic but not a pinball repairman but have tinkered with solid state and a little EM. So How would I go about setting it to 2 credits per one coin so that it should (in theory) add a game? Inspected coin mech and stepper unit and everything looks fairly good....thank you to everyone who posted and tried to offer assistance...I am so thankful to have experienced people to ask.

Interesting....where is the 2nd chute jumper for 2 plays per coin if you don't mind me asking? I believe I have a similar situation...as I think it's the left one that I am basing my info on....the machine is not with me...it's a 50/50 deal with a friend and I will be over there thurs to see if I can make a difference.

Thank you all so much . What awesome help. I'll be sure to try Thursday and report back. When we got the machine years and years ago we never thought they would make a movie about the characters on the backless yet here we are!

Curious....what do the two screws adjust that are slotted so that you can adjust them on the stepper?
I understand what the set of contacts do in terms of operation with the pin that goes up and breaks contact when you reach max amount of games but the other 2 leaf switches beside it ...how do these work and how should they be set at?

I was taking about the 2 flat head screws beside the wheel where the area is slotted in this diagram. There is 2 to the left and 2 to the right.

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This was a photo from another machine on the net but similar to Volley.

Here are the images of the stepper . I made 2 videos which I can't seem to upload that account for the way it plays. If I put a coin in the left side it automatically starts a game and removes a credit on the wheel. The quarter never adds a game on the credit wheel.
I think this may be a normal function based on other opinions. If I put a coin in the right side the game sounds like it spins and does nothing. Ultimately I would love the right coin shute to do the same as the left. Hopefully my friend will be kind enough to remove the glass and lift the play field for pictures this Thursday to see where the jumper (Jones Plug) is located.I don't quite know what to make of the "2 quarter 2 additional play" decal on the machine either...

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Thank you so much for your input . I hope to have that picture shortly.