(Topic ID: 191565)

Williams 11b coil locking on

By the96stang

2 years ago

Topic Stats

  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 2 years ago by GRUMPY
  • Topic is favorited by 1 Pinsider


Linked Games

#1 2 years ago

I have a whirlwind thats locking on the upper left jetbumper. It is a board issue and not a playfield issue because it does not happen with another board in it. I pulled the board and tested the transistor. Transistor tests fine.

What else would cause a coil to lock on (and blow the fuse)?

#2 2 years ago


A short on the board. Have you checked Q75 AND the 2N4401 Q74 ? Although I do not see the fuse blow if the coil is good and is not short.

#3 2 years ago

With 1J19 disconnected you can power on the game with out worry of melting the coil and then start troubleshooting. In attract mode check U-45 pins 11 and 12 for DC voltage (should be more than 2.5 volts). If this is good the check the base leg of Q-74 for voltage (should be less than 0.8 volts). Lastly check both legs of R-96 and it should read zero volts. Let us know what you find.

Promoted items from the Pinside Marketplace
$ 839.00
Flipper Parts
$ 50.00
$ 259.95
Lighting - Led
Pin Stadium Pinball LEDs
$ 279.95
Lighting - Led
Pin Stadium Pinball LEDs
From: $ 129.10
Cabinet - Sound/Speakers
From: $ 18.00
Apparel - Men
Pinside Shop
$ 40.00
Lighting - Other
Rock Custom Pinball
Machine - For Sale
West Chicago, IL

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside