Citizen Eco-Drive BN4021-02E User Manual

INSTRUCTION MANUAL

Citizen Eco-Drive BN4021-02E Specifications

General

Model	BN4021-02E
Case Material	Stainless Steel
Water Resistance	200 meters
Glass	Mineral Crystal
Strap Material	Polyurethane
Movement	Eco-Drive
Functions	Date

Summary

To check the movement number

Movement Number Identification

Instructions on how to locate the watch's movement number, which is part of the case number engraved on the case back.

Safety precautions

Important Safety Advisories

Defines warning symbols (DANGER, WARNING, CAUTION) and their meanings for safety advisories.

Instruction Symbols

Defines symbols used for important instructions, indicating required actions or prohibited matters.

Before using this watch

About altitude measurement

Explains that the watch is a reference, not certified altitude equipment, and potential measurement inaccuracies.

About the compass

States the compass is for reference and lists conditions for improper measurement.

When storing the watch

Advises avoiding places with strong magnetism when storing the watch.

Checking the power reserve

Instructs to check power reserve and refers to charging procedures.

Band adjustment

Recommends professional assistance for band sizing to prevent loss or injury.

Protective stickers

Advises removing protective stickers to prevent skin rash or corrosion.

How to use a specially designed crown/button

Explains the operation of specially designed crowns and push buttons to prevent accidental use.

Screw down crown/button

Details the procedure for unlocking and locking the watch's crown and buttons.

Recessed buttons

Instructions on operating recessed buttons safely using a non-marring object.

Features

Altitude measurement

Describes the function of measuring altitude by sensing atmospheric pressure.

Compass function

Explains the compass indicates direction by measuring geomagnetism.

Eco-Drive

States that the watch is powered by light and never needs a new battery.

Parts identification

Parts identification (when measuring altitude)

Identifies all visible parts of the watch relevant for altitude measurement.

Parts identification (when using the compass)

Identifies all visible parts of the watch relevant for compass usage.

Charging your watch

Low charge state warning

Explains the insufficient charge warning function indicated by the second hand's two-second movement.

Charging time by environment

Provides estimated charging times for various environments and illuminance levels.

Checking the current power reserve

Power reserve level indication

Illustrates and explains the meaning of each power reserve level (3, 2, 1, 0) and its duration.

Measuring altitude

About altitude measurement

Details how the watch measures altitude using atmospheric pressure and the standard atmosphere model.

How to read altitude indication

Guides on interpreting altitude readings using the 1000m, 100m, and 2.5m hands.

2.5 m hand indication

Specific instructions for reading altitude with the 2.5m hand, including negative altitudes.

Altitude indication examples

Visual examples showing how to read positive and negative altitude measurements on the watch.

Altitude out of indication range

Explains how the 1000m hand indicates when altitude is outside the measurable range.

Using the compass

How to read the compass indication

Explains how the compass hand points north and how to interpret bearings and magnetic fields.

Setting the time

Time Setting Procedure

Step-by-step instructions to set the watch's time accurately using the crown.

Adjusting the calendar

Calendar Adjustment Guide

Guide for correctly setting and adjusting the watch's date display, including special month considerations.

Calibrating altitude indication

About altitude indication

Explains the basis of altitude calculation and the purpose of calibrating the altitude indication.

Calibrating compass indication

About compass indication

Discusses how earth magnetism affects compass readings and the need for calibration.

About 2 point correction

Introduces the 2-point correction method for calibrating the compass based on environmental magnetic fields.

Executing 2 point correction

Provides detailed steps for performing the 2-point compass calibration procedure.

About declination correction

Explains magnetic declination and its importance for accurate true north indication.

Executing declination correction

Step-by-step guide to set the watch's declination value for accurate direction finding.

Declination and 2 point correction summary

Summarizes the benefits of using both calibration methods for optimal compass accuracy.

Checking and correcting the reference position

What is the reference position?

Defines the correct base positions for the watch's measurement hands (1000m, 100m, 2.5m).

Checking the reference position

Outlines the procedure to verify if the watch hands are correctly aligned to their reference positions.

Correcting the reference position

Step-by-step guide to adjust the watch hands to their proper reference positions.

Using the scale

Measuring altitude difference

Explains how to use the rotating scale to determine altitude differences relative to the 2.5m hand.

Seeing the bearings

Describes how to use the scale to find cardinal directions relative to the compass hand.

Troubleshooting

Cannot measure compass direction

Solutions for when the compass fails to provide a direction reading, often due to magnetism.

Cannot perform altitude or compass function

Addresses issues where altitude or compass functions are unresponsive, suggesting system malfunction.

Cannot perform 2 point correction

Guidance for troubleshooting problems during the 2-point compass calibration process.

Strange hand movement

Explains unusual hand movements, like unexpected directions or stopping, and their causes.

Incorrect calendar display

Procedure to correct the date if it is displayed incorrectly.

All Reset Procedure

Instructions on how to reset all watch settings to their factory defaults.

Eco-Drive watch handling precautions

Recharging Precautions

Important warnings regarding safe and effective charging practices, avoiding high temperatures.

Rechargeable Cell Information

Information about the watch's rechargeable cell, its lifespan, and recommended periodic inspection.

Use Only Specified Battery

Critical warning about the dangers of using incorrect battery types, which can cause rupture.

Water resistance

Water-related use guidelines

A chart illustrating appropriate and inappropriate water activities for different resistance levels.

Precautionary items and usage limitations

To Avoid Injury

General safety advice to prevent injury to oneself or others while wearing the watch.

General Precautions

Essential precautions for watch operation, especially concerning water entry and crown usage.

When Wearing Your Watch <Band>

Guidance on caring for the watch band and potential issues related to wear and moisture.

Temperature Limitations

Notes on how extreme temperatures can affect the watch's performance and operational range.

Magnetism Effects

Warnings about strong magnetic fields interfering with the watch's functions and accuracy.

Strong Shock Precautions

Advice to avoid dropping or subjecting the watch to strong impacts to prevent damage.

Static Electricity Sensitivity

Information regarding the watch's integrated circuits' sensitivity to static electricity.

Chemicals, Gasses, and Mercury

Warnings about contact with chemicals that can damage the watch's materials.

Protective Stickers

Reminder to remove protective stickers to ensure cleanliness and prevent skin issues.

Caring for Your Watch

Instructions for cleaning and maintaining the watch's case, crystal, and bands.

Information

Basic information of the altimeter

Provides key technical specifications and measurable range for the watch's altimeter function.

Altitude accuracy and error range

Presents data on the expected accuracy and error ranges for altitude readings at various heights.

Basic information of the compass

Provides key technical specifications for the watch's compass function, including accuracy assurance.

Patterned regions for compass use

Shows a world map highlighting areas where compass accuracy may be compromised due to geomagnetic fields.

Specifications

Additional functions

Lists various supplementary functions and features of the watch, such as solar power and calibrations.