I have so far been able to fix my older games, but have zero experience on newer games.

Game works for a while
Then the drop target reset starts freaking out and then fuse blows

I keep blowing F8 - 50VDC coils

I got readings on all the test points and this is what I'm getting

5V = 5
12V = 13.1
-12V = -13.8
20V = 23.2
50V = 75.6!!!

I did a quick check on the 50V bridge rectifier in circuit and I think it's testing OK.

Where else should i look?

Thanks
Rob

Those voltage readings I got are from the Power Board.
So isn't the issue somewhere on the Board itself?

That’s basically what happens.

I was in the middle of a game. The 5-bank AC/DC drops (it’s always this bank) started shotgunning up and down. Usually I would just shut the game off and that seems to fix everything. But I was having a great game. Was up to 555 million. So I kept playing hoping it would stop.

Eventually the ball ended up in the canon and never came out

F8 blown

Everything is now fine - once I replace the fuse

But I’ve done this loop like 5 times now.

You think it’s the drop targets not catching?

In checking the drops I am now remembering that when I got the machine it had issues latching. It had a bad Opto switch. When I swapped that out I thought I fixed it.

It worked for a while but now it’s happening again.

Optos seem fine now though

I’ll play around with the latching and see if that works

But does it matter that my voltage on the board at the 50v is way high at 75 v?

I played a bunch of games. It definitely struggles to reset the drops. Generally taking 2-3 tries to get them to stay. Even the TNT targets. I hadn't noticed as I rarely hit the TNT targets.

So I decided to take both drop targets apart and completely clean them. I figured since they are apart i'll put in new coil sleeves, spring washers, and get a new Rest Ledge. So will be a week beore I can put it back together and see if that fixes the problem

I'm still wondering why I get 75V at the 50v check point on the power board.

Cool. Thanks

Hopefully the deep clean of the drops solves my problem

Took both Drops apart

General Cleaning
New Coil sleeves, spring washer, Rest ledge

So far so good
I'm hoping problem solved

This problem is back again
New ledge not helping this time

The A-C-lightning bolt 3 bank (of the 5 bank) is the issue

It appears to not reset all the way. It only seems to be an issue when all three drops are down. If 2 of the 3 down, it makes it all the way up and resets

I went into switch test, and all switches fine

When I just manually try to reset the bank, it definitely has some resistance when the drops are down. If they are up, it moves freely

Any thoughts?

No

If any 1 or 2 are down, it resets fine

It’s when all three are down it can’t seem to overcome the resistance.

I put in new coil sleeves
That didn’t seem to help

Yes

Update

Took it apart again. Really cleaned the drop targets and the washers. Seems to be working now.
I guess there was just enough resistance preventing it from resetting

Let's see how long it works