I'm working on a William's Triple Strike I acquired recently. I've never had to actually post here before as I have found all the answers I've needed when working on my other games without needing to ask.

Background:
Me
-6th EM I've worked on, so have wet my toes
-I have schematics and manual
-consider myself fairly competent with electronics work, have good tools and test gear
-have read every potentially related post here and have gained a huge amount of knowledge about this machine

The machine
-Acquired from an unconditioned storage unit (a transport trailer)
-was told it worked when put in storage 15 yrs ago, I have had a few other dealings with this fellow and will take his word on that

Story so far:
-would not start or add credits
-cleaned credit unit
-cleaned a switch on the coin relay (thanks to PSchwisow for his post on reset sequence and detailed breakdown of the bonus scoring mechanism)

What's happening now:
-machine starts up when first quarter is dropped or when start is pushed and there are credits on the reel
-all drops, pin buttons etc work except the top hole (likely switch, have not looked yet, likely secondary to main problem)
-game always removes lit strikes during reset but then steps back up to having all 3 strikes lit

When draining
-no bonus for downed pins
-pins do reset
-ball counter does not decrement (stuck at ball 5)
-strikes count down to 0 without scoring points and immediately jumps back to 3 strikes lit
-1 to 10 unit does click 10 steps

I have disassembled and cleaned the 1to10 unit and ball count stepper. I have confirmed the bonus hold relay is not held in and switches are working

Any ideas or guidance on where to go from here would be greatly appreciated. In the mean time I'll be tinkering!
Thanks!

I'm heading over to where the machine is now. I'm going to check the relays you highlighted in the schematic and will check the 1to10 reset relay. Is that the relay that others have had problems with residual magnetism?

With the machine now,
-During reset the strike number 3 relay pulls in and holds in for long enough for the strike unit to count back up to 3 then drops out
-I have visually inspect the 3 strike relays and cleaned the contacts, nothing seems out of order nor has anything changed
-1 to 10 relay is not stuck on, one quick pulse

I will check that however the problem is that the strike bonus always counts back up to the third strike on reset or draining which I believe is its last position and no bonus points are scored (no chine no score reel action)

Thanks for the help everyone. I had looked at those 1-3 strike relays so many times. Made sure they were clean and properly gapped, totally over looked the fact that the lugs for the no 3 relay had been bent and were touching!

Strike bonus is now working as it should as far as resetting to no strikes. Currently no bonus points are being scored but with the one issue out of the way I will refer back to PSchwisow's run down of the bonus scoring mechanic to see where I get

After a bit of poking around I noticed the ball index relay doesn't fire during the bonus cycle.
By jumping the two contacts hughligted everything seems to work as far as scoring the bonus and decrementing the ball count on draining.

20200619_110108 (resized).jpg

20200619_105906 (resized).jpg

Things have taken a few steps back. I came to do some further investigation on the bonus issue and the machine is now stuck somewhere in the reset cycle. Seems to he near the end as it keeps firing the 1 to 10 reset, cycling the strike bonus and kicking out the ball. Scores reset fine and dont continue cycling, the drop targets reset and then dont continue firing either.

Thanks for all the help!
The game completes everything upto and including the score reels, then seems to cycle through everything thereafter. I manually added points after they reset and it didnt attempt to reset them again so it is certainly getting stuck in a loop after the score reset occurs.

The picture is just to make sure we are all referring to the same thing

Screenshot_20200620-134210_Drive (resized).jpg

Yes, the bonus relay pulls in until the 1 to 10 setup pulls in and then drops back out. It continues to repeat that over and over.

The coin relay and reset relay drop out and do not come back on. The game relay latches and stays latched

I had just enough time to check those contacts. The contact on the reset really was the culprit. I will check the other functionality when I have a bit more time. Thanks for all the help!