The schematics for the Mother PCB were recently scanned:
https://www.arcade-projects.com/threads/namco-system-11-schematics.28836/
Your work creating schematics for the CPU board is appreciated!
Feel free to grab and disseminate (I've already submitted them to arcarc.xmission.com):
https://philwip.com/wp-content/uploads/2024/02/Namco-System-11-Mother-PCB-Schematics.pdf
Thanks to mathj for sending these out for scanning.
Interesting! Recently I helped fix a Namco Classics Vol. 2 for a friend which had no video. The video amp's 12V supply had dropped to 5V. This seemed odd as I thought it would be supplied by the JAMMA 12V rail. Turns out the video amp has its own 12V supply generated by an LT1109A DC-DC...