On rare occasions, unpopulated driver board PCBs sometimes pop up on ebay.
Aftermarket PCBs for MPUs have surfaced before on ebay as well.
Quoted from heydudetyler:Looking for NOS WPC89 MPU and Power Driver boards. No remakes. Looking for original clean PCB's.
Mr. Pinball has the CPU board. It's "5764-12431-05". I don't think Williams ever used this revision so I believe this is a modified reprint of the original print / layout.
ebay.com link: Williams Bally WPC CPU Pinball Board Bare Board
He used to have the power board a year or so ago but I haven't seen them come back.
I do have reproduction blank (bare) boards that are based 90%-95%+ on the original Williams circuitry and layout. They are not modified prints of the original layout. For example ... the power board has a modification from bridge rectifiers to discrete diodes and allows a daughter board to select your desired +5V regulator (or you can use the onboard default) - typically a switching regulator rather than a linear regulator. I have a thread with more information that you should be able to find if you are interested.
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