I recently got a Chicago coin casino pinball machine.
When it was given to me it would always blow a fuse.
So i traced it back to the following components.
1 fried 1st player 10 score reels solenoid (replaced via removing the 100 solenoid from player 4)
1 fried 4th player 10 score reels solenoid (removed not yet replaced)
1 fried 0-90 unit solenoid (replaced)
So after that the game will turn on and not blow any fuses.
I set a score of one on all the score reels players 1-4 (minus the 2 that have yet to be replaced they stay on zero)
Feed the machine a quarter
Press the button on the front of the cabinet to start reset
The machine resets all reels to zero and none go past.
The score motor keeps turning.
The old owner told me the machine had a problem on reset but to start a game to pull on the zip tie he attached to the slide bar reset relay.
So after pulling the relay the machine kicks out a ball and the play field seems to work for the most part.
How ever the ball counter does not light up.
Things i have tried to fix the issues.
I removed and cleaned every score reel pcb and wiper contacts with a green pad and final with alcohol wipes.
cleaned the player counter, credit reel, 0-90 unit, ball counter, and some leaf switches on the score motor.
Things of note, the lock relay likes to buzz but all switches are making the right contact. (i need a way to fix this or else my dog will not stop barking hes fine unit it start the buzzing)
The player control relay will buzz but not always kinda just happens.
The 0-90 counter only increments when the yellow pop bumper is hit and from videos i have seen it should move when any 10 point is hit, also every once in a while seems to get out of position i think this is just the set screw i have to adjust.
I have the logic schematic but am having a hard time with it and im getting to the point i think it may not be a switch but a wire. and in this rats nest that is going to be one heck of a task to find....