Mr. Pinball Tip:

Williams solid state pinballs with the piggyback driver board had under-designed some of the resistors. The column of large resistors on the right hand side of the board (R149-R156) often burn themselves up. They have also been known to get so hot they desolder themselves. These were 2 watt 27 Ohm resistors. Replace them with 3 to 5 watt 27 Ohm ceramic resistors. Be sure to mount the resistors at least 1/8" off the board so the board doesn't get cooked.
Tip Archive

New tips are welcome and encouraged. Tips will be credited to those who contribute. If you would like to submit a tip click here.

For more information you may contact us by email, or by email form.
Go to: Home page, Photo Gallery, Classified Ads, Repair Tip of the Day, The Pinball Collector Register, Advertisers List, Site Map
© Copyright Mr. Pinball 2021. All Rights Reserved.