(Topic ID: 198678)

Williams Black Knight Transformer

By dieseldogpi

6 years ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 6 years ago by Schwaggs
  • No one calls this topic a favorite

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#1 6 years ago

Hey everyone, I'm trying to get a Williams Black Knight up and going from the dead, but I am getting some funky voltages out of the transformer. Looking at it there seems to be some possible hacks done to it, but I'm not sure. Does the attached pics look ok? Looks like there are jumpers soldered in that I don't see on other pics online. If this is normal, I guess I have to test the bridge rectifiers. If anyone has close up pics of the transformer from their system 4-7, I would appreciate it .Thanks!

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#2 6 years ago

Nevermind. Figured out there was actually a slice in the power plug so only one hot leg was reachinng the transformer.

#3 6 years ago
Quoted from dieseldogpi:

Figured out there was actually a slice in the power plug so only one hot leg was reachinng the transformer.

How many hot legs do you have? Only one (probably black) should be hot. If you're getting voltage on another leg something is wrong.

https://pinside.com/pinball/forum/topic/replacing-line-cords-plugs-wall-sockets-vids-guide#post-1945125

#4 6 years ago
Quoted from dieseldogpi:

Hey everyone, I'm trying to get a Williams Black Knight up and going from the dead, but I am getting some funky voltages out of the transformer. Looking at it there seems to be some possible hacks done to it, but I'm not sure. Does the attached pics look ok? Looks like there are jumpers soldered in that I don't see on other pics online. If this is normal, I guess I have to test the bridge rectifiers. If anyone has close up pics of the transformer from their system 4-7, I would appreciate it .Thanks!

What you have is normal, those are jumpers to connect together the various winding the the transformer primary. You can see them on the schematics page with the transformer connections. It even has the transformer terminal numbers listed.

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