Hey guys, I just picked up a stern pinball machine for a friend. It came with no MPU, so he bought an alltek for it. It's having a weird issue i'm trying to narrow down, I hope I can explain it ok enough.

So, when I turn the game on, the mpu boots with all flashes no problem, but it won't go into attract mode at all. However, the displays flash the high score to date like they should. So it's almost like the backbox is in attract, but the cabinet is not. I spent the afternoon re-pinning all the connectors, so that is done. I also put it in test mode, and all the lights work except for half of the backbox lights (likely just a wiring issue) all the coils work except the chimes, and all the switches work except for the coin slots and coin door slam tilt. One thing I noticed though while trouble shooting. The coin slots and tilt switch share the same signal wire. I checked continuity from the mpu to the switches and there was none. I thought connector, but I get cont from the switch to the connector, but none from the pf side of the connector to the mpu. I didn't have time to replace the wire last night, but i'm wondering if that signal wire is broken, will the mpu think it's always in tilt mode? I'm going to replace the whole wire today sometime.

Also, I fired the mpu into my lost world and everything is working a ok, so I know that isn't the issue.

If you have any thoughts on the matter, please hep haha. I have to deliver this thing on saturday to another province.

That was my first thought too. But I still get the issue after it's all done. My other thought was, someone who owned it before might have done some of the connectors too, because they didn't look very old. I'm thinking a wire could have been mixed up or swapped to the wrong position somewhere. Unfortunately, the stern schematics don't have the wire color chart like the ballys do, so that would be very cumbersome and time consuming to trace each one individually.

Thanks! I may take you up on that. Quick update though. I replaced that signal wire from the coin door, and I can credit up, and start a game. I still have no sound or flippers, but at least the major hurdle is through.

Can you confirm something though. Is there an attract mode? IE do the pf lights do anthing if it is idle? Mine so far just has the saucer 10000 light and the bonus lit. The 1 decent video online shows this too when a game is started.

Cheers

So everything for the most part seems to be working. The only thing stumping me is the chimes, and I can only seem to credit up a 2 player max game. I've never dealt with chimes before so a starting point would be good. The credit thing is really weird as I don't see a switch that controls that feature on the mpu.

Cheers

Max credits are set to 40. That is fine as I can put 40 credits in no problem. It won't go past a 2 player game. I can hit the credit button all day, and it stops at a 2 player game.

As for the chimes, they won't work at all. I have sw8 turned on (chimes on)

Yes there is a fuse, I replaced it with no luck.

Ah ha! Thank you!

Update for everyone. All is fixed. I traced the flipper issue to a bad ground trace on the rectifier. I figured instead of chasing my tail I would just replace it woth a rotten dog. Luckily my buddy had a brand new one. I put it in and everything is working 100%. I'm really happy with this game over all actually. I really wish I was keeping it for myself! Cheers to everyone for all the help and advice!!

Thanks a lot!! I'm really happy with it so far. If it was staying with me, it would be getting the full resto treatment. Having said that, I'm sure it will be back in my hands some day. I know he will love it. I'm planning a trip to his place for the weekend. So all the bugs should be worked out of it. Mind you I've already put about 40 games on it today haha.

Cheers!

Oh wow that looks amazing! This one is in surprisingly good shape. There is a small ammount of wear around the bonus score inserts and that is about it. Keeping it cleaned and waxed well should save it from any more for a good while. I have to instruct my friend on those basics. If he ever wants to get rid of it, the deal is I get first crack. So if and when that happens I'll plan an entire restore from the ground up.

I put some cool led's in the gi, but it doesn't fit the game too well. I'm gonna put it back to incandescent.

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Sure thing! I'll do it after work tonight. PM me your email address