Seiko Digital Quartz Cal. A638A Parts Catalogue
Seiko Digital Quartz Cal. A638A Parts Catalogue — comprehensive parts list and exploded-view reference for this classic digital quartz watch movement. Provides detailed part identification numbers and assembly diagrams for all major components: integrated circuit block, battery contacts and springs, insulator elements, speaker assembly, nematic liquid crystal display module, illumination bulb, reflecting mirror, and fasteners. Specifications include 25.4 × 25.1 mm case dimensions, 4.0 mm height without battery, 32,768 Hz quartz crystal oscillator, 12/24-hour selectable display, alarm function with time signal, and back-light illumination. Battery compatibility information for multiple types included. Essential reference for technicians performing service, repair, or module replacement on this Seiko caliber.
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Document Details
- Format
- Pages
- 3
- Size
- 97.3 KB
- Category
- Watchmaking