Seiko YT57B User Manual

1
[SPECIFICATIONS]
Cal. No.
Item
YT57B
Movement
(x 1.0)
Additional mechanism • Automatic generating system
• Energy depletion forewarning function
• Overcharge prevention function
• Electronic circuit reset switch
• Train wheel setting device
• Date calendar
• Instant setting device for date calendar
Driving system Step motor (Load compensated driving pulse type)
Loss/gain Monthly rate at normal temperature range: less than 20 seconds
Regulation system
Nil
Measuring gate by quartz tester Use 10-second gate.
Power
supply
Automatic generating systemPower generator
PARTS CATALOGUE / TECHNICAL GUIDE
Cal. YT57B
Movement
size
Outside diameter ø27.6 mm
Casing diameter ø27.0 mm
Height 4.3 mm
Time indication 3 hands
Operating voltage range 0.45 V ~ 2.2 V
Duration of charge
From full charge to stoppage: Approx. 6 months
Jewels 6 jewels
KINETIC E.S.U. Titanium lithium ion rechargeable battery

Seiko YT57B Specifications

General

Brand	Seiko
Model	YT57B
Category	Watch
Language	English

Summary

Specifications

Parts Catalogue

Technical Guide

Remarks on Disassembling and Reassembling

Detailed instructions and important notes for dismantling and reassembling watch components.

Hands

Procedure for placing the movement and pressing the hands correctly during assembly.

Oscillating Weight Screw

Guidance on tightening the oscillating weight screw with sufficient force.

Rechargeable Battery Unit

Distinguishing the YT57B battery unit from other series and handling precautions.

Circuit Block Cover

Identifying the circuit block cover for after-sales servicing.

Circuit Block

Distinguishing the circuit block for YT57B from other series.

Oscillating Weight Bridge Screw

Ensuring proper insertion of the generating rotor pivot before tightening the bridge screw.

Oscillating Weight Bridge

Instructions for lubricating the generating rotor and oscillating weight bridge.

Generating Coil Block

Identifying the generating coil block for Cal. YT57B based on lead terminal pattern.

Intermediate Wheel for Generating Rotor

Lubrication guidelines for the intermediate wheel of the generating rotor.

Fourth Wheel and Pinion

Setting position and lubrication details for the fourth wheel and pinion.

Third Wheel and Pinion

Setting position and lubrication details for the third wheel and pinion.

Fifth Wheel and Pinion

Setting position and lubrication details for the fifth wheel and pinion.

Step Rotor

Setting position and lubrication details for the step rotor.

Minute Wheel

Setting position and lubrication details for the minute wheel.

Setting Wheel

Setting position and lubrication details for the setting wheel.

Center Wheel and Pinion

Setting position and lubrication details for the center wheel and pinion.

Train Wheel Setting Lever

Setting position and lubrication for the train wheel setting lever.

Yoke

Setting position and lubrication for the yoke.

Setting Lever

Setting position and lubrication for the setting lever.

Value Checking and Adjustment

Procedures for checking resistance and current consumption for diagnostics.

Coil Block Resistance

Specification for the acceptable range of coil block resistance.

Generating Coil Block Resistance

Specification for the acceptable range of generating coil block resistance.

Current Consumption

Standard values for current consumption for the whole movement and circuit block.

Measuring Whole Movement Current Consumption

Step-by-step guide to measure the current consumption of the entire movement.

Measuring Circuit Block Current Consumption

Detailed steps for accurately measuring the current consumption of the circuit block alone.

Checking the Automatic Generating System

Methodology for verifying the functionality of the automatic generating system.

Initial Voltage and Decision Guidelines

Criteria for assessing the automatic generating system based on initial and post-charge voltages.