Seiko Cal. 2B20A Parts Catalogue and Technical Guide
Parts catalogue and technical guide for the Seiko Cal. 2B20A quartz watch movement. This service manual provides everything needed for professional watchmaking repair and maintenance of this calibre. It includes complete specifications, step-by-step disassembly and reassembly procedures, detailed parts list with exploded diagrams for component identification, lubrication point mapping and techniques, resistance and current consumption testing procedures for the coil block, and circuit block architecture. The movement features a step motor driving 2 hands with 20-second hand motion, operates on 1.55V battery power, and delivers monthly rate accuracy of less than 20 seconds. An essential workshop reference for technicians servicing this popular quartz calibre.
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Document Details
- Format
- Pages
- 4
- Size
- 97.7 KB
- Category
- Watchmaking