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7 Opto Switch Board for WPC Pinball Games

Pricing: $75.00 each + S/H






This board is a complete redesign of the 7 opto PCB used on many Williams WPC pinball machines.

Updated for 2010! This product has been redesigned to add a number of new features.


  • Revolutionary technology that reduces power consumption by over 65%
  • Less heat and better efficiency will improve the longevity of your optos!
  • Full LED diagnostics for all seven IR transmitters and receivers will help you track down faulty optos or intermittent wiring harnesses.
  • Auxillary 12V power port for your game mods! No more hacking!
  • NEW! Improved LED diagnostics now detects ground shorts and opto sensor overloads!


The following games are currently not compatible with the OSB-7 board:

Theatre of Magic - Wiring issue with left drain eddy sensor.

Click on any image for a larger version (Older version of product shown).

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Below are a couple of pictures of the OSB-7 board installed in a Demolition Man. Note that optos 5 and 7 are not used on this game.

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Watch a video of the new board in action! As each opto switch is triggered, the opto receiver's LED will go out. Hover over image below for play controls.

Warranty Information

Great Lakes Modular offers a 6-month limited warranty for this product against all workmanship defects! This warranty does not cover any damage caused from installation, modification, or use!

Liability Information

This product was designed as an aftermarket retro-fit into specific pinball machines only! Because Great Lakes Modular has no control over the conditions surrounding the installation and use of this product, the end user shall assume all liability and agrees to fully indemnify Great Lakes Modular and its agents, for any and all damages resulting from the installation and/or use of this product.

Technical Help

Should you encounter any problems with the opto board, please email us first! We will try to help as best we can to get the board installed and working!

Pricing: $75.00 each + S/H

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