Be sure to add me to your favorites list Yamaha RBX-550 II Electric Bass Guitar Service Manual and Parts List Booklet. This is a very good printed paper reproduction hardcopy of the Service manual for the Yamaha RBX-550 (II) 4-string bass guitar. This one is unused and includes: Cover Sheet / TOC Overall Assembly Parts List, * Marks the new parts for this model Circuit Diagram Wiring Diagram showing pickups, dials and output jack Specifications / Specs on the RBX 550II model bass guitar 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!