I have the same rectifier board, it’s great! It’s safe to measure voltages, but don’t plug any connectors into the rectifier board until you’ve measured all of the test points. I would also measure the voltages at the transformer, due to the varistor blowing.

Start at section 3.8 here:

https://www.pinwiki.com/wiki/index.php?title=Bally/Stern

When I work on these older Bally/Stern games, I actually pull the transformer and rectifier board out and set them on my bench , and test all the voltage there before it even goes in the game. So I could be wrong, but for me a good first step is to test the transformer+rectifier board as a stand-alone system, and only then put them in the game.

I would also try to figure out why the varistor blew, it sounds like something upstream of the transformer is bad.

Can you post a picture of the back of your rectifier board (where the transformer wires come in)?

My Weebly board (for Stern Lightning) looks different (3 bridge rectifiers, and no big diodes). Your wiring to the transformer has the same colors as the guide, except for E12. The guide says “white/black” and yours is blue/white. But if that wire goes to lug 16 on the transformer, it’s fine. [EDIT: I see that it does, so you’re good]

If you’re getting ~120V AC between the red and yellow wires on the transformer, you probably don’t need to worry about the transformer input.

This is what my board looks like:

D6BE6A3A-E233-4471-942B-3E78C4DCDAA4 (resized).jpeg

Anyways, measure voltages on TP1-TP5 (with nothing connected) and see if you’re close to the values on the board’s silkscreen.

I see what you mean - pins 6 and 7 on J2 bring 120VAC to the transformer. Now that you’ve tested all the voltages and you know they’re good, you’re safe to plug in the other 2 connectors. Let us know how it goes!

16126617-64B7-4BAC-8892-AD01FF674BE1 (resized).jpeg