The TEAC A-1500's Service Manual was instrumental in reviving this classic reel-to-reel. Not only does it have the schematics, exploded parts diagram and parts list, it also provided mechanical adjustment information that approximate factory default settings.
Text excerpt from page 14 (click to view)
COMBI BOARD COMBI BOARD - COMPONENT LAYOUT
This assembly drawing shows a summary of all possible versions. For components used in a specific version see schematic diagram and respective parts list.