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Seiko 7D56A User Manual

Seiko 7D56A
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[SPECIFICATIONS]
Item
Cal. No.
Power generator
Rechargeable
battery
Monthly rate: less than 15 seconds (worn on the wrist at temperature
range between 5 ºC and 35 ºC)
Nil
Use 10-second gate
Movement: less than 0.70 µA
Circuit block: less than 0.40 µA
Circuit block for calendar: less than 0.40 µA
Automatic generating system
MT920 Manganese titanium lithium rechargeable battery
0.45V - 2.50V
Validity of time relay function: approximately 4 years (from full charge)
16 jewels
1/44
PARTS LIST/ TECHNICAL GUIDE
KINETIC Cal. 7D56A
7D56A
Driving system
Additional function
Crown operation
Loss/Gain
Regulation system
Gate time for rate measurement
Current consumption
Power supply
Operating
voltage range
Duration of charge
Number of jewels
Normal position
1st click position
2nd click position
Coil resistance
3 hands (Hour/Minute/Second )
• Big calendar (Date)
• Year /Month indicator
24 hour indicator
Stepping motor 2 pieces and 1 piezoelectric motor for calendar
Perpetual calendar function up to 28 Feb 2100
Power save function
Time relay function
Energy depletion forewarning function
Overcharge prevention function
Electronic circuit reset function
Date correction function
Second hand stop function
Free
Calendar setting
 
Diameter
Outside :
Ø 32.0 mm
Casing :
Ø 30.0 mm
Height: 6.10
mm
Time setting
Movement
Second coil block: 2.00 - 2.45 K
Ω
Hour and minute coil block:
Coil for driving hands: 1.00 K
Ω
- 1.25 K
Ω
Coil for detecting generation: 270
Ω
- 330 K
Ω
Generating coil block: 360 - 420
Ω
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Seiko 7D56A Specifications

General IconGeneral
BrandSeiko
Model7D56A
CategoryWatch
LanguageEnglish

Summary

SPECIFICATIONS

Movement & Case Dimensions

Details on movement diameter, height, and case size.

Driving System and Additional Functions

Explains the driving system and extra watch functions.

Crown Operation and Regulation

Describes crown positions, loss/gain, and regulation.

Power Supply and Coil Resistance

Information on power source, generator, and coil resistance values.

FEATURES

Power Save & Time Relay Functions

Explains automatic power save and time relay features.

Perpetual Calendar Function

Details the perpetual calendar's automatic adjustments and manual setting.

WATCH CHARGING

Charging by Swinging

Instructions on how to charge the watch by swinging.

Charging with Energy Supplier

Describes using a specific charging device.

PERPETUAL CALENDAR SETTING

Setting Procedure

Step-by-step guide to set the perpetual calendar.

PARTS LIST: AUTOMATIC GENERATING MECHANISM

Caseback and Oscillating Weight

Lists parts related to the caseback and oscillating weight.

PARTS LIST: CALENDAR UNIT (1)

Date Disk Holder and Jumpers

Components of the calendar unit, including date disks and jumpers.

PARTS LIST: CALENDAR UNIT (2)

Indicator Wheels and Control Wheels

Parts for year, month, and 24-hour indicators.

PARTS LIST: CALENDAR UNIT (3)

Piezoelectric Motor Components

Parts related to the piezoelectric motor assembly.

PARTS LIST: CALENDAR UNIT (4)

Calendar Corrector and Circuit Block

Components for calendar correction and circuit block connections.

PARTS LIST: CIRCUIT BLOCK

Circuit Block Covers and Bridge

Covers and structural parts for the main circuit block.

PARTS LIST: MOTORS/GEAR TRAIN MECHANISM (1)

Coil Blocks and Wheels

Components related to motor coils and gear train wheels.

PARTS LIST: SETTING MECHANISM (2)

Yoke, Clutch Wheel, and Stators

Parts for the setting mechanism, including yoke and stators.

PART IDENTIFICATION AND MAINTENANCE TOOLS

Distinguishing Resembled Parts

Guidance on identifying similar watch parts.

Required Tools and Consumables

Lists tools and oils needed for disassembly/reassembly.

TECHNICAL GUIDE: MOVEMENT DISASSEMBLY

Removing the Setting Stem

Step-by-step instructions to remove the setting stem.

TECHNICAL GUIDE: SETTING MECHANISM

Setting Lever and Yoke Installation

Procedures for installing setting levers and yoke.

TECHNICAL GUIDE: GEAR TRAIN MECHANISM

Center Wheel Bridge Installation

Instructions for installing the center wheel bridge.

TECHNICAL GUIDE: PART IDENTIFICATION AND LUBRICATION

Identifying Rotors and Wheels

Helps differentiate similar watch parts like rotors and wheels.

Lubrication Points

Specifies lubrication points and oils for various parts.

TECHNICAL GUIDE: MECHANISM LUBRICATION

Calendar and Automatic Generating Lubrication

Lubrication details for calendar and automatic generating mechanisms.

TECHNICAL GUIDE: REASSEMBLY STEPS

Oscillating Weight and Battery Unit

Instructions for assembling oscillating weight and battery unit.

TECHNICAL GUIDE: HAND INSTALLATION

Procedure for Hand Installation

Step-by-step guide for correctly installing watch hands.

TECHNICAL GUIDE: MOVEMENT AND DIAL SETTING

Setting Movement Date, Month, Year

Instructions for setting the movement's date, month, and year.

Dial Fixing Procedures

Steps for correctly fixing the dial onto the movement.

TECHNICAL GUIDE: INSPECTION AND MEASUREMENT

Measuring Current Consumption (Whole Movement)

How to measure the total current consumption of the watch movement.

TECHNICAL GUIDE: CIRCUIT BLOCK CURRENT CONSUMPTION

Measuring Circuit Block Current

Procedure to measure the current consumption of the circuit block.

TECHNICAL GUIDE: COIL BLOCK RESISTANCE

Coil Resistance Specifications

Lists the resistance values for various coil blocks.

Leakage Check for Hour/Minute Coils

Method for checking leakage in hour and minute coil blocks.

TECHNICAL GUIDE: AUTOMATIC GENERATING SYSTEM CHECK

Checking Generating System Voltage

Procedure to check the voltage of the automatic generating system.

TECHNICAL GUIDE: FUNCTIONAL CHECKS

Crown Operation Checks

Verifying functions by operating the crown in different positions.

TECHNICAL GUIDE: PERPETUAL CALENDAR & PTP INSPECTION

PTP Operation Inspection

Method to inspect the PTP operation of the perpetual calendar.

TECHNICAL GUIDE: PERPETUAL CALENDAR INSPECTION

Perpetual Calendar Auto-Advance Check

Procedure to check the automatic advancement of the perpetual calendar.

TECHNICAL GUIDE: WATER RESISTANCE & ACCURACY TESTS

Water Resistance Test Standards

Specifications and methods for water resistance testing.

Accuracy Test Procedure

How to perform and verify the watch's accuracy.

TROUBLESHOOTING GUIDE

Key Function Summary

Summary of important characteristic functions for troubleshooting.

TROUBLESHOOTING: PROBLEMS AND SOLUTIONS

Movement Rotation Issues

Addresses problems with oscillating weight rotation and charging.

Current Consumption Issues

Troubleshooting for excessive current consumption.

TROUBLESHOOTING: CIRCUIT BLOCK & POWER SAVE

Circuit Block Current Consumption Issues

Troubleshooting for circuit block current exceeding standards.

Power Save Function Issues

Addresses issues with power save and time relay functions.

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