Be sure to add me to your favorites list Roland 80's TB-303 Sequencer Synthesizer Service Notes Sheets, Reproduction This is a very lightly used printed scan of the Roland TB303 Sequencer / Synthesizer Service notes. It has 3 pages of specs, photos with part numbers, on opening the unit up and a diagram of the main circuit board. This is a copy / reproduction of the original sheets, which are very hard to find these days. This offers some help on fixing up your classic 303! 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!