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Seiko V157A User Manual

Seiko V157A
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PARTS LIST / TECHNICAL GUIDE
ANALOGUE SOLAR Cal. V157A/V158A
[SPECIFICATIONS]
1/18
Item
Cal. No.
V157A/V158A
Power reserve
Driving system
Additional function
Crown operation
Loss/Gain
Regulation system
Number of jewels
Normal position
1st click position
Current consumption
Gate time for rate measurement
Power supply
Motion of the second hand
Coil resistance
Power
generator
Rechargeable
battery
Operating
voltage range
2nd click position
One-second intervals
Stepping motor 1 piece
Diameter
Outside: 28.6 mm
Casing: 24.0 mm
Height: 3.5mm
3 hands (hour, minute and second hands)
date indicator/day indicator(only for V158A)
Instart-start function
Energy depletion forewarning function (The second hand moves at
two-second intervals.)
Overcharge prevention function
Electronic circuit reset function
Second hand stop function
Date calendar
Instant setting device for date calendar
Day calendar (only for V158A)
Instant setting device for day calendar (only for V158A)
Free
Time setting
Monthly rate:less than 15 seconds (worn on the wrist at
temperature range between 5 to 35 degrees Centigrade)
Use 10-second gate
Nil
Solar power generation system
Movement: less than 0.80 μA
Circuit block: less than 0.40 μA
Coil block: 1.80 - 2.20 K
Ω
MT920 Manganese titanium lithium rechargeable battery
0.45V - 2.20V
From full charge to stoppage: Approximately 10 months
2 jewels
V157A V158A
Date setting(counter clockwise)
Day setting (clockwise, only for V158A)
Movement
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Seiko V157A Specifications

General IconGeneral
BrandSeiko
ModelV157A
CategoryWatch
LanguageEnglish

Summary

Specifications

Motion of the second hand

Details the movement of the second hand in one-second intervals.

Driving system

Specifies the driving system as a stepping motor.

Additional function

Lists additional functions like instant-start, energy depletion warning, etc.

Crown operation

Describes crown positions and their functions for date/time setting.

Loss/Gain

Specifies the monthly rate of time loss or gain.

Regulation system

Indicates that the regulation system is 'Nil'.

Gate time for rate measurement

Specifies the gate time for rate measurement as 10 seconds.

Current consumption

Details current consumption for movement and circuit block.

Coil resistance

Provides the coil resistance range.

Power supply

Details the power supply system including battery type and voltage.

Number of jewels

States the number of jewels used in the movement.

Features

Solar power generation

Explains the watch's solar power generation system and operation.

Energy depletion forewarning

Describes the second hand movement at 2-second intervals when battery is low.

Instant-start function

Details immediate operation upon exposure to light.

Charging time guidelines

Provides a table of charging times for different light sources and conditions.

Charging precautions

Offers crucial advice to avoid damage from excessive heat during charging.

Parts List

General Parts Identification

Lists major watch components with their corresponding numbers and names.

Part Selection Guidance

Explains how to select parts based on case design and catalog.

Required Tools and Consumables

Lists essential tools like movement holder and watch oils for maintenance.

Technical Guide

Disassembling and Reassembling Remarks

Provides general notes on disassembling and reassembling watch components.

Hands Installation

Instructions on how to properly install the hour, minute, and second hands.

Dial Installation

Guidance on setting and fixing the dial onto the movement.

Movement Disassembly and Reassembly

Details how to remove the setting stem before dismantling the movement.

Holding Ring for Dial Disassembly/Reassembly

Instructions for disassembling and reassembling the dial holding ring and solar cell.

Contact Spring for Solar Cell Assembly

Step-by-step guide for assembling the contact spring for the solar cell.

Intermediate Wheel for Day Setting

Details on the assembling direction for the intermediate wheel for day setting.

Date Dial Guard Disassembly/Reassembly

Procedure for disassembling and assembling the date dial guard with hooking portions.

Rechargeable Battery Unit Handling

Instructions for removing and installing the rechargeable battery unit, including polarity notes.

Setting Lever and Stem Procedures

Describes setting positions for yoke, setting lever, and stem installation.

Inspection and Measurement

Checking Electrical Characteristics

Details on checking coil resistance and current consumption of the whole movement.

Circuit Block Current Consumption

Procedure for measuring current consumption specifically for the circuit block.

Circuit Block Structure

Diagram illustrating the structure and terminals of the circuit block.

Solar Power Generation System

Checking Solar Power Generation (Watch)

Steps to check the solar power generation system of the entire watch.

Checking Solar Power Generation (Solar Cell Only)

Procedure to test the solar power generation of the solar cell unit independently.

Instant-Start Function

Checking Instant-Start Function

How to verify the instant-start function by checking battery voltage and light exposure.

Recharging Function

Checking Recharging Function

Procedure to measure battery voltage before and after recharging to assess function.

Function Check

Function Check: Setting Mechanism

Verifies the click and stem security during time setting operations.

Function Check: Calendar Correction

Ensures smooth day and date changes when the crown is in the 1st click position.

Function Check: Second Hand Stop

Confirms the second hand stops when the crown is pulled to the 2nd click.

Function Check: Hands Installation

Checks for smooth movement of hour and minute hands without interference.

Function Check: Date Change at Midnight

Ensures the date correctly changes as hour and minute hands pass midnight.

Water Resistance

Water Resistance Checking Methods

Details test methods and applied pressures for various water resistance ratings.

Accuracy Check

Instantaneous Rate Accuracy Check

Procedure to measure the rate and ensure it is within ±0.50 s/d using a 10-second gate.

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