MAMIYA - Mamiya M645 Super Body TechBulletin

Technical service bulletins for the Mamiya M645 Super camera body detailing modifications and design improvements rolled out from 1987 onwards to address production and field-use issues. The documentation spans five distinct service updates: an S-button guide modification (effective October 1987) that prevents component separation through unified part design; a BC button guide retrofit (part 6200 27561, available May 1987) with quick-bond adhesive assembly instructions; an angel plate revision (6200 17172, May 1987 production) correcting signal pin operation via shape modification; a mirror mechanism improvement addressing sudden mirror release during crank rewind by adding a supplementary spring (6200 13432) with geometry refinement; and an M-base plate upgrade (March 1987 onwards) that resolves signal lever malfunction through lever shape modification (C), with edge finishing requirements for proper installation. Includes precise part numbers, production implementation dates, and step-by-step assembly and replacement procedures essential for workshop technicians and restoration specialists maintaining or repairing the M645 Super body.