Be sure to add me to your favorites list Yamaha BBG4A II / BBG4S II Bass Guitar Service Manual. This is a printed paper hardcopy copy of a Service manual for the Yamaha models BBG4A II and BBG4S II 4 string bass guitars. This one is like new and includes: Cover sheet / TOC Overall assembly / exploded view of the bridge parts list / full list of parts circuit boards / IC block diagram circuit diagram wiring / F R pickups, F R volumes Tone dial specifications / full specs on these models This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thanks for looking! Check out my Store!