Seiko Cal. 7N07C, 7N08C Parts Catalogue and Technical Guide

Complete parts catalogue and technical guide for Seiko Cal. 7N07C and Cal. 7N08C quartz movements. This service manual delivers the technical depth needed for professional watchmakers and experienced repair technicians working with these economical yet reliable movements. Detailed specifications are paired with exploded view diagrams showing every numbered component, making identification and sourcing straightforward. Step-by-step disassembly and reassembly procedures walk you through the complete process, while dedicated lubrication guidelines specify Moebius A oil application points for optimal performance and longevity. Movement dimensions and electrical specifications are fully documented. The guide covers all functional aspects of these 3-hand movements, including the step motor with load-compensated driving pulse type, train wheel setting device, and electronic circuit reset switch. Battery information details the SR621SW cell and compatible alternatives, all rated at 1.55V nominal voltage with an approximate 2-year service life. The battery life indicator function is explained to help diagnose battery condition during service. These zero-jewel movements carry no mechanical regulation system, simplifying maintenance while keeping the design cost-effective. An indispensable workshop reference for anyone servicing these Seiko calibers.