Flip Flop
Bally, 1976I bought a 1976 Bally Flip Flop. I turn it on press start then it cycles player one scores to zero but none of the other players, it then keeps cycling the score 1 and score 2 resets nonstop.
All three of the leafs are open on all score reels for all 4 players. I took them all off and sanded all the contacts lightly. I have videos of it happening that I cannot upload here.
E1510D92-BFB4-4FA2-A2EA-272C92AA472F (resized).jpegHi 
pantallica , Welcome to pinside!!
Check that the Bonus Unit is resetting to zero and that the Bonus Unit zero switch is opening.
Quoted from pantallica:I bought a 1976 Bally Flip Flop. I turn it on press start then it cycles player one scores to zero but none of the other players, it then keeps cycling the score 1 and score 2 resets nonstop.
All three of the leafs are open on all score reels for all 4 players. I took them all off and sanded all the contacts lightly. I have videos of it happening that I cannot upload here.
[quoted image]
You need to get familiar with the reset circuit of your game... specifically 3C on page 6 below.. score reset relays are an issue I believe... perhaps both.. but separate issues...
https://www.ipdb.org/files/889/Bally_1976_Flip_Flop_Manual.pdf
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