Recently picked up my first EM, Williams Wild Card from 1977. I've uploaded the schematic and manual here since they're not currently on IPDB (Uploading new items seems to be disabled?).

Here are the issues I've noticed:

1. Right sling shot doesn't score points or ring chime.
2. The lower switch on right slingshot changes the lit match number in the backbox. Both switches in the left slingshot change the lit match number.
3. Increments of 10000 score in Bonus, but 5000s do not (i.e. 10k or 20k will score, 5k, 15k or 25k will not).
4. Double Bonus doesn't score any Bonus.
5. The Left and Right eject holes intermittently do not spot an Acey or Ducey. While testing this, there was also a point where the switch did not seem to register at all (the ball was not ejected and no points, Aceys or Duceys awarded.)

So far all I have done to address was clean the contacts on the bonus unit with q tip and alcohol.

Would appreciate any guidance as I am a complete noob on EMs. I do own both a multimeter and a soldering iron, and am capable with both.

Thank you in advance!

For learning's sake I'll write my inclinations below (now that I'm sitting down to write and think):

1. For the right slingshot, I'll need to trace the Green-Black wire to the 10 point relay and make sure there's proper continuity.
2. The match problem is confusing for me. I would have imagined it's a short, but the last page of the schematic seems to show the 10 Point Relay connects Match Unit. So, maybe this is proper functionality?
3. Something to do with the X relay?
4. Same as above?
5. Stumped.

wild card manual-compressed.pdf

wild card schematics.pdf

Thanks Mark, was able to fix the chime issue with some adjustments. The right kicker switches needed some cleaning as did the chime switch at the 10 point relay.

Any ideas about the bonus issues? I'm really not sure where to look here. I don't understand how the bonus count works.

I started looking at the score motor after looking at some other tech threads. Mine seems to be missing some of the spacers/pins on the right-most switch stack. I guess I'll have to find replacements. What are these pieces called?

According to the schematic this is the impulse cam.

20180926_182634 (resized).jpg

Screenshot_20180926-183138_Drive (resized).jpg

Thanks for your response.

If bonus is at 5k you get 0, 15k you get 10k, 25k you get 20k. I'll have to look at how 5k is awarded (you mean how does the score motor run when a 5k switch is hit, right?) The 10k/20k etc in bonus is awarded by the 10k relay

I'll look into the lifters in the morning

Got a 3d printed spacer/lifter the other night, popped it in and the game is working perfectly now. Thanks for your help MarkG