EM Tech: Bally Nip-It Zipper Flippers

Xerico

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Hi.

My Nip-It now starts up and plays a game.

The scoring relays for 10, 100 and 1,000 all work properly.
The scoring reels are working properly.

My zipper flippers will close when the close flipper mushroom button is hit.
However, they will not open when the open flippers roll over button is hit.

I have cleaned the switch for the open button. But the zippers remain closed.
Without a schematic, I am without a "next" step.

So if anyone happens to have a schematic, please provide some insight.

Also, the nylon "tooth" is pretty worn. Is there anyone that sells that part?

Thanks.

Marcus
 
Looking at the Nip It schematic, the open flippers relay and rollover button are associated with the 23-6 and 14-5 "panel to cabinet plugs". There are blue-yellow and red-green wires to check as well. My hunch is that it's a wire/connector issue.
 
Update:

I was able to make some very good progress last night on the zipper flipper issue.

Last night, I was able to make the zipper flippers open with the open flipper button.

However, to make it work, I basically had to trigger the pop bumpers.

I'm hoping to get a schematic later this week, so I will be able to trace the sequence better.

But it appears that the Pop Bumper switches are affecting the open flippers button.

I am able to open the flippers once. However, the second time I attempt to open the flippers, it fails. But the flippers will open when I trigger the pop bumpers. The third time, the open flipper buttons works. The fourth time, it fails.

So, I do know that zipper flippers will open when the open flipper button is activated. I just need to figure out how to make it happen each and every time.

I'll tackle it again on Friday when I return home.

Marcus
 
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