Download the CR-8000 Service Manual: This might be the most useful service manual I’ve come across, and the precise labeling of key locations on the voice generator board made the work a breeze. Roland really used to have their shit together.
Download the CR-8000 Voice Board Schematic: Here’s a “corrected” version of the original voice board schematic. It was a bit of a pain scrolling around in the service manual pdf, so I pasted the two pages together and aligned everything to make a hardcopy reference for the bench. Some component values are still difficult to read so you might want to check against the PCB before making any mods if you’re unsure of the component’s location/value. Print it out!
Download the labeled voice swapping Voice Board Schematic: This document shows all of the PCB locations and components needed for voice swapping.