I have great news - The PC3 Service Manual is now complete. Because the file size is over 10MB when encoded for mailing, I am sending it in two parts. This is part 1 and the filename is: PC3_ServiceManual_R10_Part1.PDF It contains everything except parts lists and schematic drawings. The PC3 Service Manual contains: 1. Basic operating instructions for the PC3 2. Descriptions and usage of the diagnostics 3. Disassembly and reassembly instructions with drawings 4. Troubleshooting and maintenance procedures 5. Parts lists 6. Complete schematic drawings of all circuit boards When printing, be aware that the schematic drawings in Chapter 6 (Pages 6-3 - 6-20; .PDF pages 84-101) are formatted for 11x17 (Ledger, A3) size paper in Landscape orientation. Because they are very dense, printing these on 8.5x11 (Letter, A4) paper is not recommended. The other pages are formatted for normal 8.5x11 paper in Portrait orientation. PLEASE NOTE: This manual is written for experienced electronic service technicians. It contains information proprietary to Young Chang / Kurzweil Music Systems. Distribution is limited to authorized Kurzweil service centers, dealers, and our factories on a need-to-know basis. General distribution to the public is prohibited. Howard Chamberlin Director, Young Chang R&D Institute / Kurzweil Music Systems