Try this site, listed about 1/2 way down the page.
PianoCorder/Marantz Reproducing System: $35.00
This manual contains the Circuit Description and Schematic Diagrams for the P-100, P-100M, P-101, P-101M, P-200, pr-200, PR-201. Written for use by Qualified Technicians Only. Spiral bound, 8-1/2" X 11", 100 pages. http://www.player-care.com/reprints.html
- Frank B.