Seiko W307A Service Guide - Technical Data
Complete service manual for the Seiko W307A digital watch module, covering full technical specifications and repair procedures. The W307A features a compact 27.4mm diameter case with 4.8mm height, nematic liquid crystal FEM display, and multiplex driving system. Display modes include 12-hour and 24-hour time/calendar functions, 20-second alarm, and stopwatch capability up to 60 minutes with integrated time and calendar setting controls. The module incorporates an alarm test system, hourly time signal, automatic return mechanism, full automatic calendar function, and pattern segment checking for display verification. Powered by a CR2016 lithium battery rated for 7 years of service life at 3.0V. This workshop manual covers system reset procedures essential for calibration and maintenance, current consumption measurement protocols using the Seiko Digital Multi Tester S-840A with Multi Adaptor MA-40A, and comprehensive technical data necessary for accurate diagnostics and repair work. An indispensable reference for watch technicians servicing this model.
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Document Details
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- Category
- Watchmaking