Seiko 3Y02A - Technical Guide
Seiko 3Y02A – Technical Guide
Introduction
The Seiko 3Y02A is a quartz movement developed to deliver precise and consistent timekeeping. Known for its reliability and efficiency, the 3Y02A is commonly found in Seiko watches emphasizing durability and ease of use. It provides a straightforward display of hours, minutes, and seconds, powered by a long-lasting battery.
Technical Specifications
| Feature | Specification |
|---|---|
| Movement Type | Quartz |
| Caliber Number | 3Y02A |
| Battery Type | SR920SW or equivalent |
| Accuracy | ±15 seconds per month |
| Functions | Hours, minutes, central seconds |
| Battery Life | Approximately 2–3 years |
| Size (Diameter) | Approximately 25 mm |
| Thickness | Approximately 3 mm |
| Operating Voltage | ~1.55 V (silver oxide battery) |
Key Features
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High accuracy regulated by a quartz crystal oscillator.
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Simple time display: hours, minutes, and seconds.
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Designed for low power consumption and long battery life.
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Compact and thin design suitable for a variety of watch styles.
Battery and Replacement
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Uses a standard SR920SW silver oxide battery or equivalent.
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Battery typically lasts 2–3 years depending on usage.
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Battery replacement should be performed professionally to maintain water resistance.
Operation and Maintenance
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The movement operates continuously with minimal need for adjustment.
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Regular maintenance includes battery replacement and gasket inspection.
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Cleaning of electronic contacts may be necessary if the watch behaves erratically.
Common Issues and Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Watch stops or slows | Dead or weak battery | Replace battery |
| Seconds hand jumps | Dirty or corroded contacts | Clean contacts |
| Hands do not move | Step motor or circuit failure | Service or replace movement |
| Timekeeping drifts | Aging quartz crystal | Movement replacement recommended |
Applications
The 3Y02A movement is commonly found in Seiko watches requiring accurate and reliable timekeeping with a simple three-hand display.
Summary Table
| Attribute | Specification |
|---|---|
| Movement Type | Quartz |
| Caliber Number | 3Y02A |
| Battery | SR920SW (Silver Oxide) |
| Accuracy | ±15 sec/month |
| Functions | Hours, minutes, seconds |
| Battery Life | 2–3 years |
| Size | ~25 mm diameter, ~3 mm thick |
Conclusion
The Seiko 3Y02A quartz movement offers accurate, low-maintenance timekeeping suitable for a broad range of wristwatches. Its reliable performance, efficient power use, and simple operation make it a popular choice in Seiko’s quartz movement lineup.
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