More resources for YOUNZ
I have a Honda-published manual downloaded from this page:
I BELIEVE that I have the third one after SOHC4 Motorcycles, but I'm not going to download again to check because it's 1,200 PDF pages. It has the CB750 plus a general Honda manual plus many magazine articles and reviews.
Even though it doesn't list 750A, it gives many specs to help interpret electrical measurements.