There are several versions of the Commodore 1541 disk drive. Some are covered by the technical manual, other schematics were scanned from later documents. There is even a reverse engineered diagram of the 1541-II drive.
Mirror sites: FUNET (ftp http) ibiblio.org (ftp http) – General information – File types – CD-R snapshots – Data transfer
cbm-adm@ftp.funet.fi