Where can I find a free Motherboard Diagram, Schematic for a Performa 640 CD?

I've never seen a LB diagram more detailed than this (other sites show the 630 and 640 are almost identical):

https://www.macgurus.com/products/motherboards/mbperf630.php

and it is little better then the illustrations in the Apple Source Service manual.

We are not Apple so do not have unlimited access to detailed tech drawings like circuit diagrams.

There are some very basic variants in the Apple Service Source document. Different images show where direct components are, but it is far from complete. However, it is all I could find.

http://tim.id.au/laptops/apple/legacy/quadra.lc_630.performa_640.pdf

WOW! Glad that did the trick. Thanks for the follow-up.