I'm hoping you experts can help with reading this 1953 Williams schematic copy that I was fortunate to be able to get from Pinball Resource.

I had the schematic scanned to a file so I can view it on a computer. It's much easier to visualize the circuits when you can zoom in on them.

SteveFury's schematic posts were very helpful for me in understanding/troubleshooting circuits and game sequences.

I also had a copy of the schematic printed so I can write notes and letter abbreviations for the wire colors on it.

This schematic has a very sparse legend as compared to the 1964 Williams schematic that I have as you can see from the screenshot.

1. What does "reuse of same color wire" mean? I understand body color and tracer or mottled color but I'm trying to visualize what red-white-same color would look like?

2. "Double throw normally closed" - Is this a make/break/make switch configuration where the middle switch breaks from the top switch and makes with the bottom switch?

3. The legend doesn't state how many switches and what types they are for each relay. I'll have to count them all and make my own legend for them.

Bruce

Wire Color Code (resized).jpeg

Thanks zacaj,

1. What is the Jumper and what does it look like/do? This is in the legend and on the schematic as "J".

I included a screenshot of "Low Voltage Tap" because I'm not sure what this is or what it does. Is this where you use the Jumper to switch between high and low voltage tap?

2. What do the letter/numbers mean for the coils? I see A, B, etc letters over the coils.

Apparently "Re" is short for Relay as in "500,000 Relay" because Williams spells "Reset" out fully and S.U. is short for Stepping Unit (or Stepper Unit).

Bruce

Jumper (resized).jpeg
Coils (resized).jpeg

Thanks Zacaj and Runbikeskilee.

I have not seen a 50's Gottlieb schematic for comparison but this one seems more "basic" and a bit cryptic.

I'm not sure what "o at z R.P.S.U" means except Relay P... Stepping Unit"?

Does "Index" mean the resting position of the score motor after reset and unplug power?

Bruce

RPSU (resized).jpeg
Index (resized).jpeg

Thanks zacaj and drsfmd.

Here is something I've never seen on a schematic. Looks like this is the stepper unit arm that closes the switch.

Arm (resized).jpeg

That makes sense, thanks.

Good catch. I think you're right. I found several coils that matched the part number there. Nice to know this for future reference!

Bruce

Coil B28-1150 (resized).jpeg

Coil Part Number (resized).jpeg

I have a 6v and 45v circuit flow question about the transformer in this schematic.

Does the current flow from the middle "lug" to the 6v/45v circuits and complete the circuits at the ends?

Bruce

Transformer Circuit (resized).jpeg

Thanks Dr_of_Style, that makes sense. I've heard that Williams pinballs used DC. Is it possible this 1953 machine is DC instead of AC?

Bruce

Thanks Runbikeskilee for answering my question.

What is a "shuffle" and what does it do? I noticed the "shuffle" mechanism on a 1949 United woodrail but couldn't figure out what it does and it's also listed in the 1953 Williams schematic.

Bruce

Shuffle (resized).jpeg

Thanks John, good to know this. My game has trap holes so that must be what it's for.

Bruce

(Resurrecting this old thread)

I was thinking it may be easier to learn how to follow these Williams schematic circuits by associating them with actual photos of the components.

I found a tilt switch (pictured) while going through my game and tightening switch stacks/checking for proper switch contact wiping action, that was probably bent by a tech for the previous owner to disable the three tilt mechanisms and I'm looking for it in my digital copy on the Mac. I'm not sure the pictured tilt relay is part of the schematic circuit below. It's hard to tell from the faded wire colors.

(I added the wire colors in Photoshop Elements to make it easier to reference them than using Williams' number codes. For example "32" is yellow with blue tracer or YLW-BLU)

Am I correct that the wire colors for this schematic snippet should be BLACK to the 3 tilt mechanisms and the wires on the left side of the tilt mechanisms would be YLW-BLU?

Tilt Relay cropped (resized).jpg

Tilt circuit (resized).jpg

Ok thanks. I found the Yellow&Blue and black wire colors on the tilt relay coil. (on the other side)

IMG_20190128_184329280 (resized).jpg

R.P.S.U I believe would be Replay Stepping Unit? 0 at Z means 0 position at the Z relay?

What stepping unit should I look for? There are 5 with my game but the label on one of them is worn out.

0 at Z R.P.S.U (resized).jpg

Edit: I found I'd already asked in this thread. Will make sure I don't ask the same questions again.

Yes, the lower one is the Replay Stepping Unit. The upper one you have the arrow pointing to is the Points Stepping Unit.

My goal is to learn how this game works and to be able to find everything that's on the schematic.

Here is the Replay Unit with the Open at Zero label. (This unit is currently apart being cleaned and lubed)

DSCN4830 (resized).JPG