(Topic ID: 309262)

Stern Electronics Bridge Rectifier Board Help

By dddanielll

6 months ago


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  • 12 posts
  • 3 Pinsiders participating
  • Latest reply 6 months ago by swampfire
  • Topic is favorited by 1 Pinsider

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#1 6 months ago

Repairing a Flight 2000. Wasn't getting correct voltages on my rectifier board so repinned the connectors, that didn't fix it so I bought a Weebly kit. Built the kit, installed it, plugged the game in to a power strip, flipped the game's power switch and then turned the strip on. Everything seemed to be working well until the varistor that's attached to the line filter started smoking. I plan on replacing the varistor but I want to figure out what I should check that might cause that. Besides a lightning strike I don't know what else can cause the varistor to blow, Attached photo of the rebuilt RB (before i clipped the keyed pins).

Next I plugged in just J2 and starting smelling something so I pulled the board to double check wiring. Checked transformer taps (two are double tapped not sure if thats normal but attached a photo just in case) and connections to board. Plugged it back in and the smell is definitely coming straight from the RB, began to increase over 30 seconds so I turned the game off and unplugged it. The F6 fuse was hot but not blown. Not sure what to do next as it seems unsafe to measure voltages, any help would be much appreciated!

Thanks!

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#2 6 months ago

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

#3 6 months ago
Quoted from swampfire:

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

I think I need to plug in J2 so it’s grounded though right? Also I’m concerned about the smell from the board and hot fuse. Is this not an issue?

#4 6 months ago

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.

#5 6 months ago

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

#6 6 months ago

Ah okay interesting. Not sure I have a setup currently to test that way but good to know.
Here’s photos of everything in question.

Also what would be upstream from the transformer that I could check?

Edit: I did have the 3A fuse in when testing just removed when it got hot to see if it blew.

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#7 6 months ago

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:

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#8 6 months ago

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

#9 6 months ago

Will do! Thanks for all your help so far!

#10 6 months ago

Measurements from Rectifier Board with only input power (J2) connected:

TP1: 6.3
TP2:184
TP3: 15.5
TP4: 7.5AC
TP5: 46.5

#11 6 months ago
Quoted from dddanielll:

Everything seemed to be working well until the varistor that's attached to the line filter started smoking. I plan on replacing the varistor but I want to figure out what I should check that might cause that. Besides a lightning strike I don't know what else can cause the varistor to blow,

Did someone previously install an incorrect voltage rated varistor on the EMI filter?
Nothing in the game can cause a correct line varistor to blow, only high voltage surges upstream from your wall socket can do it.

#12 6 months ago

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!

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