did I understood well, that you put off all components of the PCB to get an empty board? Then you want to draw a circuit diagram of the board?
In the 1990s a colleague and I did a similar job, but we did not destroy the original Z80-interface-board. He checked the circuits on the board with an ohm-meter. So we got a big chart with all connections of the components. I disassembled the EPROM. So we could redesign a new board with similar functions.
If you have really an empty board (hopefully it is only double sided and not a multi layer), you can scan it with a flat bed scanner on both sides. Then you can try to colorize the sides in different colours and make them semi transparent. Then you can overlay them to get a good overview.
I think it will be a lot of work, but you will get a good documentation for your system.
I wish you good luck!
Removing them all was a must, certain components can interfere multimeter readings (low impedance resistors, dead capacitors, etc.). And yes, I was going the scanner way (scanners don't have either lightning or perspective problems). You read my mind.
Just for the record, months ago I had the backplane documented, but I don't remember where did I post it... Those documents may belong to this thread now and for this reason I'm uploading them here too.
Thank you very much,