Seiko Kinetic 7D46, 7D48 & 7D56 Movement Technical Specification

Introduction to Seiko Kinetic Movements

This document details the specifications and operation of Seiko Kinetic watch movements, specifically models 7D46, 7D48, and 7D56. These movements utilize Seiko's Kinetic technology, which generates electrical energy from the wearer's motion to power the watch.

Key features include a 24-hour indicator, a power reserve indicator that functions for approximately 15 seconds, and an estimated battery life of 4 years under normal usage.

Functions and Features

Calendar System

The movements incorporate a comprehensive calendar system displaying the day, month, and year. The calendar is designed to be accurate up to the year 2100.

Power Saving Mode

To conserve energy, the movements feature a power-saving mode, indicated by a 2-second interval for the second hand. This mode extends the battery life to an estimated 10 years.

Movement Diagrams

Seiko 7D46 Movement

[Diagram of the Seiko 7D46 movement, showing the main hour, minute, and second hands, the 24-hour indicator, and the date display.]

Seiko 7D48 Movement

[Diagram of the Seiko 7D48 movement, showing the main hour, minute, and second hands, the 24-hour indicator, and the date display.]

Seiko 7D56 Movement

[Diagram of the Seiko 7D56 movement, showing the main hour, minute, and second hands, the 24-hour indicator, and the date display.]

The 24-hour hand provides a clear indication of AM/PM.

Kinetic System Operation

The Seiko Kinetic System harnesses the wearer's movement to generate electricity. This energy is stored in a power cell, which then drives the watch's functions. The 24-hour hand and the 2-second interval for the second hand are key operational indicators.

Detailed Operation: 24-Hour Hand and 2-Second Interval

The 24-hour hand operates independently of the main time display, indicating AM or PM. The 2-second interval for the second hand is a power-saving feature, activated when the watch is left stationary for an extended period. This conserves energy by reducing the movement of the second hand.

Refer to specific diagrams (e.g., Fig. 2.19) for detailed illustrations of these functions.

Calendar and Power Saving Details

The calendar function requires proper setting to ensure accuracy, especially around month-end transitions. The 2-second interval feature is crucial for maximizing power reserve and battery longevity.

Refer to specific diagrams (e.g., Fig. 2.11 and Fig. 2.19) for detailed illustrations.

Crown and Button Functions

Function for Crown Position 1

[Description of function for crown position 1, typically for winding or basic setting.]

Function for Crown Position 2

[Description of function for crown position 2, typically for time or date setting.]

Charging and Power Reserve Indication

The watch indicates a low power reserve by the second hand moving in 2-second intervals. A full charge typically provides a power reserve of approximately 4 to 6 months. The low power indication may last for about 20 seconds.

Time Setting and Calendar Correction

Setting the time and calendar requires careful adherence to specific procedures to avoid damage to the movement. The calendar correction should only be performed when the time is set between 1:00 AM and 11:00 PM to prevent potential date mechanism issues. The `[15 seconds/minutes]` indicator may be used for certain setting procedures.

The 2-second interval feature is also relevant during these setting operations.

Calendar Setting and Leap Year Correction Diagrams

Seiko 7D46 Calendar/Leap Year Diagram

[Diagram illustrating calendar setting or leap year correction mechanism for the 7D46 movement.]

Seiko 7D48 Calendar/Leap Year Diagram

[Diagram illustrating calendar setting or leap year correction mechanism for the 7D48 movement.]

Seiko 7D56 Calendar/Leap Year Diagram

[Diagram illustrating calendar setting or leap year correction mechanism for the 7D56 movement.]

These diagrams help visualize the 12-month calendar cycle and the 24-hour indicator. The calendar is designed to be accurate for 4 to 5 days after setting. For safe time setting, ensure the time is between 23:00-01:00 or 23:30-00:30.

Calendar Setting Details

Specific procedures apply for setting the calendar for months such as October (OCT), February (FEB), and December (DEC).

Leap Year Correction and Time Setting

The movements support leap year correction. Detailed instructions are provided for setting the correct date and time, including specific procedures for months like December (DEC) and January (JAN).

Advanced Calendar and Time Adjustments

Further details on calendar and time adjustments are provided to ensure accurate functionality of the watch movement.

Leap Year Correction Table

The following table outlines the leap year correction periods:

Instructional Steps

Step 3: Leap Year Correction

Follow specific steps for correcting the leap year setting if necessary.

Step 4: Date Setting

Instructions for setting the correct date.

Step 5: Time Setting

Instructions for setting the correct time.

2-Second Interval Function and Power Saving

The 2-second interval movement of the second hand is a power-saving feature. When the watch is not worn, the second hand will move in 2-second increments to conserve energy. This feature helps extend the battery life to approximately 1 year.

Battery Life and Charging Times

The power reserve for a fully charged movement is approximately 450 days. Charging the watch requires approximately 200 hours of wear. The estimated battery life is 1.5 years. Specific charging times may vary, with typical durations including 12 hours, 10 hours, or 1.5 hours for partial charges.

Technical Specifications

Power Reserve

32,768 [Hz for quartz crystal or reference number]

Operating Temperature

[5°C to 35°C]

Shock Resistance

[-10°C to +60°C range specified]

Water Resistance

2 [equivalent to 20m or 2 bar]

Magnetic Resistance

1- [e.g., 1 Gauss]

Battery Life

1 year

Accuracy

±2 seconds per month

IC Type

C-MOS-IC 3

Other Specifications

[Details for other specifications.]

Additional Specifications and Notes

[Note] Indicates important information or warnings.

[Function] Describes specific operational actions or features.

[Symbol] Represents specific indicators or markers on the watch face or movement.