Seiko Cal. Y481F Technical Data Sheet

Technical data sheet for the Seiko caliber Y481F quartz movement, providing comprehensive specifications for service technicians and watchmakers. Details the movement architecture with main plate dimensions of 18.4 mm spanning 6H to 12H positions and 15.3 mm across 3H to 9H, housed in a 17.8 mm diameter case at 2.8 mm total height. The movement features a three-hand time display driven by a step motor with load-compensative pulse system technology, ensuring reliable timekeeping under varying winding conditions. Incorporates a secondary setting device for precise seconds adjustment and an electronic reset switch for quick reference-time correction. Chronometric performance is specified at less than 20 seconds monthly deviation across the normal temperature operating range when measured using a 10-second gate quartz tester—a standard benchmark for production quality control. Battery compatibility covers SEIKO SR6215W, MAXELL SR6218W, SONY SR6215W, and EVERADY 364 cells (1.55V nominal, approximately 2 years service life under typical wear conditions). Current draw remains exceptionally low at less than 1.2 µA, extending battery longevity and reducing replacement intervals. This repair manual data sheet is essential for anyone servicing or reconditioning Y481F-equipped timepieces.