PENTAX - Pentax spotmatic k1000 Meter substitution

This PENTAX technical service bulletin provides comprehensive instructions for replacing the SP series meter with a K1000 model on Spotmatic cameras. The document begins by highlighting the crucial physical differences between the two meter types, supported by comparative diagrams showing critical dimensional variations (10.2 mm for SP type versus 11.8 mm for K1000). The modification section outlines precise procedural steps: trimming the plastic body ends to appropriate specifications, removing the bottom cover, and applying insulation tape to prevent electrical shorts with the camera body. Installation and position adjustment procedures are thoroughly explained, noting that the K1000 meter features center positioning while the original SP system used off-center placement. Specific guidance is provided for applying the required 2µA current, with two alternative methods accommodating different testing equipment configurations. The wiring section describes the wire cutting and soldering process following meter installation. Technical notes alert technicians to operational differences in the modified meter setup, including slightly different « off » positioning and marginally reduced sensitivity compared to the original meter. Included diagrams clearly illustrate mechanical modifications, current application setups, and wiring distribution to ensure proper installation.