John Deere's own schematics are only officially available as part of a technical manual, and these must be purchased in either printed or CD format, according to the company website. These manuals are identical to the information John Deere dealerships use, so they are highly complex and detailed.
Some users create their own John Deere schematics and post them online, often in PDF format. Using these is legal, as only the visual element of the original schematics is protected by copyright. These often have enough detail to allow the user to identify a specific part required or to troubleshoot an issue, but they are less likely to be adequate for full servicing and repair. Additionally, there is no formal repository. Therefore, consumers must perform searches per model and system, and there is no guarantee that the correct one is available.