(Topic ID: 143574)

Going nuts with a Williams...would love help


By 4Max

3 years ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 3 years ago by Pecos
  • Topic is favorited by 1 Pinsider

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#1 3 years ago

So, swallowing pride here as I thought I would figure this out on my own, but I need the Pinside techie wizards before I have a mental breakdown.

Working on a Williams Dealers Choice project. I have schematic, manual, and have the machine alive, but keeping getting stuck here:

1. Press credit button - machine resets, all good
2. Press credit button again - lights 2 players, still all good, except:
3. The score motor stops short of home position*, so pressing credit button does nothing, and
4. If I switch machine off and on, credit button does nothing until I manually rotate to home position, at which point I'm back to step 1 above

If after step 2, I manually advance score motor to home, then credit button advances to player 3 correctly, but score motor stops short again.

And, sometimes after step 1, the score motor over runs the home position!

*I'm assuming home is when switches on Index cam "drop" into one of the two cut-outs, thus making switch A on Index, required for credit circuit to work.

There are other problems (some score reels not resetting, drained ball zeros bonus but does not kick-out/advance ball count) but I figured I concentrate one one thing at a time!!

Sorry for the long post, but tried to get all the details in.

Any thoughts folks?

#2 3 years ago

Hello 4Max. I had a Williams Expo that had a score motor that over-ran home position. The gears would keep turning AFTER the motor stopped. I took enough of the score motor assembly apart to get to the motor gears. I thoroughly cleaned the gears and axles and then put on some Super Lube. I don't know if this is "accepted" or "best" policy for score motor maintenance but it stopped the cams over-runing the home position.

#3 3 years ago

Check the motor run switch. It's on the schematic in section A-14 on the index cam. It's that switch that tells the motor its rotated a complete cycle.

#4 3 years ago

I'm think that the run SW on the score motor is at fault, make sure it is closed until the cycle is complete. odd that you only see this happening on player two.

#5 3 years ago

Hi 4Max +
I agree with chris (post-4) - The Score-Motor-Switch "B" on the Index-Wheel. Whenever You check a Switch: Not only look at the blades / contact-points - ALSO grab the wires (soldered-on) and gently pull. Wires can be broken-off - they are stiff and stay in place - then a bit of vibration / shaking -> the wire moves (no contact) - another bit of vibration / shaking -> the wire moves back (contact again).
The strange thing is: It does not happen at player-1, strange.
ipdb.org has a schema in three parts: http://www.ipdb.org/machine.cgi?id=649 -> might want to (?) make a copy (down) onto Your computer ("righthand-side" Mouse-click -> save target as) -> Do You see at schema (first part), 4-C the "Score-Motor-Switch-Index-B" ? Wires "Yellow" and "Orange-Green" ? (See in Schema second part: "Drawing of Score-Motor"). Greetings Rolf

P.S.: Strange, when I make a copy of the schema (onto my computer): My copy is turned clockwise (90 degrees) - And: I can open my copy with "MS-Paint" and therefore can comfortably move around in the schema.

#6 3 years ago

First, thanks for the replies. It was so weird with only occurring on player 2 that I went back to EM basics and cleaned and checked every relay, play-field & score motor switch, and...it now advanced correctly.

An (obvious) lesson learned - when you get an EM project there are no shortcuts; you have to clean every stepper, relay, switch...and be patient.

The machine is not 100%, but its a lot closer now!

#7 3 years ago

Great news! Thanks for letting us know that you got it working.

Quoted from 4Max:

...when you get an EM project there are no shortcuts...

Not if you want your EM to work the best it can. You will be rewarded for your patience and hard work.

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