Seiko 3M22A - Technical Guide

Seiko 3M22A – Technical Guide

Introduction

The Seiko 3M22A is a quartz movement developed by Seiko for watches requiring accurate, low-maintenance timekeeping. Known for its efficiency and reliability, this movement is used in various Seiko models, offering a balance of performance and simplicity.

Technical Specifications

Feature	Specification
Movement Type	Quartz
Caliber Number	3M22A
Battery Type	SR920SW (Silver Oxide)
Accuracy	±15 seconds per month
Functions	Hour, minute, central seconds
Battery Life	Approximately 2–3 years
Size (Diameter)	Approx. 25 mm
Thickness	Approx. 3 mm
Operating Voltage	~1.55 V

Key Features

Quartz precision ensures excellent timekeeping accuracy.
Displays hours, minutes, and seconds with standard step motor.
Designed for low power consumption, extending battery life.
Compact and thin design suitable for slim watches.

Operation and Maintenance

The movement runs on a silver oxide battery, typically SR920SW, which should be replaced every 2–3 years.
Battery replacement is recommended to be performed by professionals to maintain water resistance.
Regular servicing includes checking and replacing gaskets and cleaning contacts to ensure reliable operation.

Common Issues and Troubleshooting

Issue	Possible Cause	Solution
Watch stops or slow	Dead or weak battery	Replace battery
Erratic seconds hand	Dirty contacts or corrosion	Clean contacts
Hands not moving	Step motor or circuit failure	Service or replace movement
Poor accuracy	Aging quartz crystal	Replace movement

Application

The 3M22A is typically found in entry-level to mid-range Seiko quartz watches, especially those prioritizing simplicity and reliability without additional complications.

Summary

Attribute	Specification
Movement Type	Quartz
Caliber Number	3M22A
Battery	SR920SW (Silver Oxide)
Accuracy	±15 sec/month
Functions	Hour, minute, second
Battery Life	2–3 years
Size	~25 mm diameter, 3 mm thick

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