Seiko Cal. 8M25A, 8M25B Parts Catalogue and Technical Guide
Seiko Cal. 8M25A, 8M25B Parts Catalogue and Technical Guide — comprehensive service documentation for these quartz step-motor movements. Provides detailed movement specifications including outside diameter Ø24.0mm, casing diameter Ø25.5mm, and 2.6mm height, alongside technical data on the fixed-width pulse stepping motor system, regulation via trimmer condenser, and 4-jewel construction. Exploded diagrams display all internal movement components and circuit block assembly with precise parts identification. Includes technical notes highlighting the specific differences between 8M25A and 8M25B calibers to aid accurate servicing and parts matching. Battery specifications cover SEIKO SR920W and Maxell SR920W cells at 1.55V with approximately 2.5 years estimated service life. Essential reference for watch repair technicians and movement specialists working on these common quartz calibers.
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Document Details
- Format
- Pages
- 14
- Size
- 357.7 KB
- Category
- Watchmaking