Calibre Y446A Digital Quartz Technical Guide and Parts List

Comprehensive technical service manual for the Seiko Calibre Y446A digital quartz movement. This workshop guide delivers the depth needed for professional repair and maintenance of this precision timepiece module. Detailed specifications cover the 29.5 mm case diameter, 5.2 mm height profile, and the 32.768 Hz crystal oscillator that governs timekeeping accuracy across the -10°C to +60°C operating range. Step-by-step case disassembly and reassembly procedures detail proper silicon grease application at critical wear points to ensure smooth operation and longevity. The manual includes full module disassembly and cleaning protocols essential for restoring function after service. Verification and adjustment sections address every critical parameter: battery voltage, liquid crystal panel conductivity, bulb illumination condition, speaker block function, switch response, current consumption, and rate accuracy. Liquid crystal panel segment electrode diagrams for both Y446A and Y458A variants provide the visual reference needed to diagnose display faults. A complete module parts list with individual part numbers enables rapid identification and sourcing of replacement components. This is the authoritative reference for anyone servicing or rebuilding this movement.