Seiko A721A Watch Module Parts Catalogue and Technical Data
Complete service and technical reference for the Seiko A721A digital watch module (Cal. A721A), a Nematic Liquid Crystal display unit with 1/4 multiplex driving architecture. This parts catalogue and technical data document covers the 27.5mm diameter, 5.0mm height module in full detail. Specifications include dual 12/24-hour time and calendar display, stopwatch with split and lap timing capability, memory storage for up to 100 measurements, alarm display function, illuminating backlight, and confirmation sound feedback. The manual provides complete module structure diagrams, comprehensive parts list with exploded assembly views and individual part numbers for accurate identification and ordering, battery compatibility data (SEIKO CR2016, Maxell CR2016, Sanyo CR2016, Matsushita CR2016, EVEREADY CR2016), and verified technical performance standards including monthly accuracy within 20 seconds. Essential reference for technicians servicing or repairing this popular quartz module, or for replacement parts sourcing and module assembly verification.
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Document Details
- Format
- Pages
- 7
- Size
- 302.4 KB
- Category
- Watchmaking