Seiko H601A Movement - Parts Catalogue and Technical Guide

Parts catalogue and technical guide for the Seiko H601A hybrid quartz movement, providing comprehensive service and repair documentation. Details the analogue-digital display configuration with 3 hands and nematic liquid crystal digital section, step motor driving system with load compensation, and multiplex driving architecture for digital control. Movement specifications include 24.5mm outside diameter (between 6 and 12 o'clock), 23.0mm between 3 and 9 o'clock, and 2.5mm height. The manual covers complete numbered parts list with exploded views, disassembly and reassembly procedures, circuit block structure diagrams, and segment-electrode relationship mapping for the LCD panel. Includes detailed installation instructions for battery, hands, winding stem, switch spring, train wheel bridge, and reflecting mirror. Features regulation via trimmer capacitor, 1 jewel, SEIKO SR920W or Maxell SR920W battery (2-year service life at 1.55V), with accuracy specification better than 15 seconds monthly. Essential troubleshooting and maintenance reference for watch technicians and repair professionals working on this hybrid movement.