Add a few credits to the credit wheel and see if problem still happens. If so, check you "free play" configuration.
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Add a few credits to the credit wheel and see if problem still happens. If so, check you "free play" configuration.
Sorry just sold by1970 Bally Trail Drive. Don't have the schematic. Just a soft copy of the instructions.
It goes Credit button to Credit relay, Credit relay to Coin Relay. I would check the schematic to see what is in between the Credit and Coin Relay energize path. (Should be nothing)
Make sure the normally open Switch on the Credit relay that is to activate the coin relay is clean and fully closed when activated.
Also check that the wire/solder joints are still intact.
Check the other wire on the credit switch on the schematic, the trail drive when to CAM 8 and the Front Door Slam.
I am looking at the schematic between B2 and E2 Ok looks like Gray (90-4) connected tot the Coin re. (C2) Blue-w (25-5) (follow right and then down to 8D SCM Normally closed. Down then left to the Front Door Slam br-r (61-6).
That should be the path. So check the the credit relay Gray and blu-w switch, The 8D blue-w and br-r and the Front door Slam switch. (On your coin door - looks like a tilt and should be normally closed)
Top to Bottom. (Black to Yellow) have to have a complete circuit. Because your not adding coins. I ignored those paths. Left to right is from the transform. Because the Credit relay works it's not a fuse
Credit button is normally open. so the Credit relay doesn't fire. When press the Credit button then it changes from open to close. It go up to the Credit unit zero (No credit on the wheel) If there are one or more credit or set up for free play this would be closed. Then it goes up from through one of the 3 paths (whichever one is closed) to the Coil. Then the coil energized and closes all the Normally open switches for the Credit relay.
Here is a good resource on how things work.
https://pinside.com/pinball/forum/topic/em-pinball-circuits-basics-to-not-so-basic
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