Seiko Cal. 7G21A Parts Catalogue and Technical Guide
Parts catalogue and technical guide for Seiko Cal. 7G21A watch movement. Includes detailed specifications: 2.2 mm height, 15.5 mm case diameter, step motor with load-compensated driving pulse, LED illumination, electronic circuit reset switch, and train wheel setting device. Contains exploded diagrams of movement components, battery specifications (1.55V for watch, 3.0V for bulb illumination), disassembly and reassembly procedures, lubrication guidelines using Moebius A, SEIKO Watch Oil S-6, and silicone oil 500,000 c.s., and value checking parameters for coil block resistance and current consumption.
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Document Details
- Format
- Pages
- 4
- Size
- 96.6 KB
- Category
- Horlogerie