Seiko Twin Quartz Cal. 97 Series Service Manual

Seiko Twin Quartz Cal. 97 Series service manual for technicians and watchmakers performing repair, maintenance, and restoration work. This comprehensive workshop manual details the complete mechanical and electronic architecture of the Twin Quartz movement, starting with full specifications: 32,768 Hz crystal oscillator, Ø26.0 mm case diameter, and 2-jewel bearing configuration. The repair guide provides step-by-step disassembly and reassembly procedures illustrated with exploded mechanical diagrams of the calendar mechanism—all 19 numbered components precisely identified to ensure correct order and orientation during service. Lubrication protocols specify exact oil types and application points critical for regulating friction and ensuring long-term timekeeping stability. Time accuracy adjustment procedures walk through the calibration process, supported by comprehensive checking and adjustment tables for step motor regulation and trimmer condenser fine-tuning. The battery section covers silver oxide power cells with approximately 5-year service life at 1.55V nominal voltage, plus installation and polarity guidance. Operating range specifications (-10°C to +60°C) define the environmental limits within which the movement performs to rated tolerance. Essential reference for anyone servicing these precision quartz watches.