MAMIYA - Mamiya M645 Super Accessory TechBulletin

Official Mamiya technical bulletin addressing accessories and field modifications for the Mamiya M645 Super camera system. This service documentation presents three focused sections detailing critical connector and bellows compatibility updates:

The first section covers new Connector N contacts (ref. 040), documenting material upgrades for contacts B, C, and D that had shown weakening under field use. Mamiya implemented these improved contacts from March 1987 production onward, with full part numbers provided: 6284 86562 for Contact D, 6284 86582 for Contact B, and 6284 86572 for Contact C. Assembly diagrams show precise contact positioning and integration with surrounding components.

The second section addresses the Auto Bellows release plate (ref. 021), which had a functional issue with the type 1 design failing to reliably engage the body release button. The improved type 2 plate geometry was introduced from October 1986. Comparative schematics clearly illustrate the upgrade path from the obsolete type 1 to the corrected type 2 design.

The third section details the mounting ring assembly configuration specific to M645 Super bodies equipped with Auto Bellows, including part references SLS 53632, SLS 54272, SO0021730, SLS 53812, SLS 53862, and SLS 53892. Side-by-side assembly diagrams compare the standard M645 mounting setup with the M645 Super specification requirements.

Issued February and October 1986, this workshop reference is essential for M645 Super maintenance, troubleshooting, and repair procedures involving accessory compatibility and modification.