I just bought a Williams 1975 Triple Strike machine that is (so it seems) in fairly decent working order. There is something wrong with it and we're trying to troubleshoot it out. One of the pieces that is giving us problems is currently unidentified to us. I think it might be the match knocker, but I don't really know.

In the first pic you can see the whole of the back box of the game itself. The component is the one in the upper left hand corner. Second pic is a close up. Third the view from the right.

What is happening when I hit start is the score motor engages and starts the reset mode, but it doesn't finish. All the drops and score wheels reset, but the motor keeps churning while the unknown component keeps knocking. Also, the credit wheel isn't registering right and reads the 12 credit marker as "zero", 13 as 1, so on (which I can only get to engage at this point by manually turning the wheel. And the final thing is that the ball is not getting kicked into the plunger.

I don't know if any of that helps or not in identifying that piece, but any help would be really appreciated. I've never owned an EM machine before and I'm quite excited about the project.

Thanks.

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Thanks for the input. Autumn you are correct in that it is the score knocker.

I'm the first to admit it, and that's I don't know what I'm doing with this EM machine, so I'm taking it slow. I've been reading through the pinrepair and starting at step one, while reading textbooks along side the machine. I've also been trying to track someone down in my area that knows about EM coin operated devices to give me a crash course, but to no avail. I'm in Santa Fe NM which is not a major city, but there is a nuclear lab nearby... Any suggestions on avenues which could be pursued to find someone with this kind of knowledge? I've been calling electricians, antique shops, community colleges, tried CL, appliance repairmen, etc.

So far, I've checked the solenoids and coils, looked at all the of the switch leaves, tested amps and replaced lamps. I'm about to go through and polish all the contacts and de gunk what needs it before I start pulling the SW, stepper units, etc off. Any other suggestions on things to look at before I start dissembling to clean?

"Also bridge out the SW. that makes contact (closes) at 1 or more credits that will get you into free play (look for the middle of the 3 SWs but may be different) also the max credit SW will open after 37 credits that is what should stop the credit unit from attempting to step up. " Autumn, could you explain that a little bit more? I'm not sure I understand.

I have some other questions, but I've lost the two posts before this one due to browser issues, so they will wait. I also would love to give a break down of what is going on with this pin to see if any of you might have other help or insight I might be able to glean. Attached are a couple of pics of the machine in the state I got it in. Not bad for $120 with delivery. I was really shocked when I opened it. These pictures are pre-vacuum...

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and 2

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Much thanks. I knew that I could probably find the help I need online, but didn't think I would find anyone that was willing to offer advice so freely. Pictures really make asking for help lots easier

I was going to ask if there is a "standard" measurement for the of the tabs in between the leaves on the SM, as there are 4 different "sizes" pictured on the schematic but no numbers. I was also trying to think of a type of plastic I could buy and cut replacements out of as there are a couple others through the machine which are cracked. Thoughts?

Now I'm off to look at a Jive time. There are a ton of EM machines in my area that don't work which people want to sell, so I'm pushing myself hard on this..

aha! I was just reading about the big blue spark on pinrepair. I really wish at some point in time I can meet the man who put that thing together, just to say thanks, because it is a goldmine of information. I did notice a BBS on the index wheel, I think it was the top most switch.

Here is the issue so far as I see it. First, the coin toggle doesn't active the credit relay, although it fires the $.25 relay as the connectors say it should. Other than that the game starts, goes through the reset mode (SW at 00000, credit drops, flags reset, bonus, ect) but the ball doesn't get kicked into the plunger. Then the motor continues to go, firing the outhole relay (which is supposed to activate the eject relay) and the credit knocker continues to sound on the home position of the score motor and repeat. As far as I can tell, other than that, the game operates like it should with the targets resetting and everything scoring correctly, flippers function, and when the ball drains the trip for the "end of ball" sequence isn't fired. I'm assuming the end of ball switch and the eject relay are tied together somehow, but I've not found it yet on the schematic.

Examiner said the phrase "dirty switch on the stack." Thank you for bringing that up as I hadn't thought about looking at it in that way yet and it brought up a couple of good questions for me. My thought process tells me that if the final switch on the stack isn't activated, that the process which initiated the stack will try to repeat activating the stack until the action is carried out. Follow? Is that right? So if the SW is trying to activate A, B, and C and any one of those (B) isn't working properly, it will continue to try to finish the sequencing of B while still activating A and C because they are on the same wheel?

Autumnfade. Dude, you are the shit. Thanks! it was the top contact leaf on the 5E. I can't believe it was that simple. Now it's detailing time!