Seiko Cal. 5M42A, 5M43A Parts Catalogue and Technical Data
Seiko Cal. 5M42A and 5M43A parts catalogue and technical data for automatic watch movements. Includes comprehensive parts diagrams with numbered components for service and repair work. Movement specifications: 27.6mm outside diameter, 27.0mm casing diameter, 4.3mm height, 3-hand display, step motor with load-compensated driving pulse. Features automatic generating system with power reserve indicator, overcharge prevention circuit, electronic circuit reset switch, and train wheel setting device. The 5M43A variant adds date and day calendar functions. Monthly accuracy specification is less than 15 seconds. Movement rated at 6 jewels with polyacene lithium condenser capacitor operating at 0.5–2.3V and 168-hour charge duration. Requires Moebius A and SEIKO Watch Oil S-6 for proper lubrication. Essential reference for watch technicians and repair specialists working with these automatic calibres.
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Document Details
- Format
- Pages
- 12
- Size
- 314.6 KB
- Category
- Watchmaking