G-Shock 3495 Digital 5600 Series 43mm Watch

Product Information

Specifications

• Model: MA2306-EB
• Watch Operation Guide: 3495

Precautions

Operating Precautions

Water Resistance: The information below applies
to watches with WATER RESIST or WATER RESISTANT marked on the back
cover.

Water Resistance Under Daily Use:

Enhanced Water Resistance Under Daily Use:

Do not use your watch for scuba diving or other types of
diving that require air tanks.

Watches that do not have WATER RESIST or WATER RESISTANT
marked on the back cover are not protected against the effects of
sweat. Avoid using such a watch under conditions where it
will be exposed to large amounts of sweat or moisture, or to direct
splashing with water.

To maintain water resistance:

• Have the gaskets of your watch replaced periodically (about
  once every two or three years).

• A trained technician will inspect your watch for proper water
  resistance whenever you have its battery replaced. Battery
  replacement requires the use of special tools. Always request
  battery replacement from your original retailer or from an
  authorized CASIO service center.

• Avoid swimming, washing, or any other activity that causes
  direct exposure of a leather band to water.

Product Usage Instructions

General Guide

The general guide provides information on the various indicators
and modes of the watch.

Indicators

The indicators on the watch display important information such
as the time, date, alarm status, and battery level.

Navigating Between Modes

You can navigate between different modes of the watch to access
various functions and features.

Charging

The watch can be charged using a compatible charging cable or
through solar power.

Viewing the Face in the Dark

The watch is equipped with a backlight function that allows you
to view the face in low light or dark conditions.

Alarm

The alarm function allows you to set and configure alarms for
various purposes.

Configuring Alarm Settings

You can configure the settings for the alarm, such as the time,
duration, and sound.

Configuring the Hourly Time Signal Setting

You can configure the settings for the hourly time signal, such
as enabling or disabling it.

Turning Off an Alarm or the Hourly Time Signal

You can turn off an active alarm or the hourly time signal when
they are activated.

Stopwatch

The stopwatch function allows you to measure elapsed time, split
time, and time the first and second place finishers.

Measuring Elapsed Time

You can use the stopwatch to measure the total elapsed time from
a start point to an end point.

Measuring a Split Time

You can use the stopwatch to measure the time between two points
while keeping the total elapsed time running.

Timing the First and Second Place Finishers

You can use the stopwatch to time the first and second place
finishers in a race or competition.

Timer

The timer function allows you to set a countdown timer for
specific durations.

Setting the Time Using the Timer

You can set the duration of the timer and start the
countdown.

Time Adjustment

The time adjustment function allows you to adjust the time
displayed on the watch.

Time Adjustment Using a Time Signal

You can adjust the time using a time signal received from an
external source.

Overview of Appropriate Signal Reception Location

An overview of the locations where you can receive the time
signal for accurate time adjustment.

Time Signal Reception Ranges

The ranges within which the time signal can be received and used
for time adjustment.

Auto Time Calibration Signal Receive

You can enable or disable the automatic reception of the time
calibration signal.

Enabling and Disabling Auto Receive

You can enable or disable the automatic reception of the time
calibration signal.

Manual Time Calibration Signal Receive

You can manually initiate the reception of the time calibration
signal.

Receive Level Indicator

The receive level indicator displays the strength of the time
calibration signal reception.

Checking the Last Time Adjustment Result

You can check the result of the last time adjustment performed
using the time calibration signal.

Signal Reception Precautions

Precautions to be taken while receiving the time calibration
signal for accurate time adjustment.

Using Watch Operations to Adjust the Time Setting

You can use various watch operations to manually adjust the time
setting.

World Time

The world time function allows you to check the time in
different cities around the world.

Checking World Time

You can check the time in different cities by selecting the
desired city from the world time list.

World Time City Setting

You can set your home time and select the city for the world
time function.

Swapping Your Home Time and World Time

You can swap the displayed time between your home time and the
world time.

Other Settings

There are various other settings that you can configure on the
watch.

Changing the Date Display Format

You can change the format in which the date is displayed on the
watch.

Specifying the Day of the Week Language

You can specify the language in which the day of the week is
displayed on the watch.

Enabling the Button Operation Tone

You can enable or disable the button operation tone, which
produces a sound when a button is pressed.

Configuring Power Saving Function Settings

You can configure the settings for the power saving function,
which helps conserve battery power.

Other Information

City Table

A table containing information about various cities and their
corresponding time zones.

Troubleshooting

Common issues and solutions related to the usage of the
watch.

FAQ

Coming soon…

MA2306-EB

© 2021 CASIO COMPUTER CO., LTD.
Watch Operation Guide 3495

Contents
Precautions
Operating Precautions User Maintenance Battery
Before Getting Started…
General Guide Indicators Navigating Between Modes Charging Viewing the Face in the Dark

Alarm
Configuring Alarm Settings Configuring the Hourly Time Signal Setting Turning Off an Alarm or the Hourly Time Signal
Stopwatch
Measuring Elapsed Time Measuring a Split Time Timing the First and Second Place Finishers
Timer
Setting the Time Using the Timer

Time Adjustment
Time Adjustment Using a Time Signal Overview Appropriate Signal Reception Location Time Signal Reception Ranges Auto Time Calibration Signal Receive Enabling and disabling Auto Receive Manual Time Calibration Signal Receive Receive Level Indicator Checking the Last Time Adjustment Result Signal Reception Precautions
Using Watch Operations to Adjust the Time Setting
World Time
Checking World Time
World Time City Setting
Swapping Your Home Time and World Time

Other Settings
Changing the Date Display Format Specifying the Day of the Week Language Enabling the Button Operation Tone Configuring Power Saving Function Settings
Other Information
City Table Specifications
Troubleshooting

OPUM-F

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Watch Operation Guide 3495

Precautions

Operating Precautions

Water Resistance
The information below applies to watches with WATER RESIST or WATER RESISTANT marked on the back cover.

Water Resistance Under Daily Use

Marking on watch front or on back cover
Example of Daily Use

No BAR mark

Hand washing, rain

Yes

Water-related work, swimming

No

Windsurfing

No

Skin diving

No

Enhanced Water Resistance Under Daily Use 5 Atmospheres

Marking on watch front or on back cover
Example of Daily Use

5BAR

Hand washing, rain

Yes

Water-related work, swimming Yes

Windsurfing

No

Skin diving

No

10 Atmospheres

Marking on watch front or on back cover
Example of Daily Use

10BAR

Hand washing, rain

Yes

Water-related work, swimming Yes

Windsurfing

Yes

Skin diving

Yes

20 Atmospheres

Marking on watch front or on back cover
Example of Daily Use

20BAR

Hand washing, rain

Yes

Water-related work, swimming Yes

Windsurfing

Yes

Skin diving

Yes

Do not use your watch for scuba diving or other types of diving that requires air tanks.
Watches that do not have WATER RESIST or WATER RESISTANT marked on the back cover are not protected against the effects of sweat. Avoid using such a watch under conditions where it will be exposed to large amounts of sweat or moisture, or to direct splashing with water.
Even if a watch is water resistant, note the usage precautions described below. Such types of use reduce water resistance performance and can cause fogging of the glass. Do not operate the crown or buttons while your watch is submersed in water or wet. Avoid wearing your watch while in the bath. Do not wear your watch while in a heated swimming pool, sauna, or any other high temperature/high humidity environment. Do not wear your watch while washing your hands or face, while doing housework, or while performing any other task that involves soaps or detergents.
After submersion in seawater, use plain water to rinse all salt and dirt from your watch.
To maintain water resistance, have the gaskets of your watch replaced periodically (about once every two or three years).
A trained technician will inspect your watch for proper water resistance whenever you have its battery replaced. Battery replacement requires the use of special tools. Always request battery replacement from your original retailer or from an authorized CASIO service center.
Some water-resistant watches come with fashionable leather bands. Avoid swimming, washing, or any other activity that causes direct exposure of a leather band to water.

The inside surface of the watch glass may fog when the watch is exposed to a sudden drop in temperature. No problem is indicated if the fogging clears up relatively quickly. Sudden and extreme temperature changes (such as coming into an air conditioned room in the summer and standing close to an air conditioner outlet, or leaving a heated room in the winter and allowing your watch to come into contact with snow) can cause it to take longer for glass fogging to clear up. If glass fogging does not clear up or if you notice moisture inside of the glass, immediately stop using your watch and take it to your original retailer or to an authorized CASIO service center.
Your water-resistant watch has been tested in accordance with International Organization for Standardization regulations.
Band
Tightening the band too tightly can cause you to sweat and make it difficult for air to pass under the band, which can lead to skin irritation. Do not fasten the band too tightly. There should be enough room between the band and your wrist so you can insert your finger.
Deterioration, rust, and other conditions can cause the band to break or come off of your watch, which in turn can cause band pins to fly out of position or to fall out. This creates the risk of your watch falling from your wrist and becoming lost, and also creates the risk of personal injury. Always take good care of your band and keep it clean.
Immediately stop using a band if you even notice any of the following: loss of band flexibility, band cracks, band discoloration, band looseness, band connecting pin flying or falling out, or any other abnormality. Take your watch to your original retailer or to a CASIO service center for inspection and repair (for which you will be charged) or to have the band replaced (for which you will be charged).

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Watch Operation Guide 3495

Temperature
Never leave your watch on the dashboard of a car, near a heater, or in any other location that is subject to very high temperatures. Do not leave your watch where it will be exposed to very low temperatures. Temperature extremes can cause your watch to lose or gain time, to stop, or otherwise malfunction.
Leaving your watch in an area hotter than +60 °C (140 °F) for long periods can lead to problems with its LCD. The LCD may become difficult to read at temperatures lower than 0 °C (32 °F) and greater than +40 °C (104 °F).
Impact
Your watch is designed to withstand impact incurred during normal daily use and during light activity such as playing catch, tennis, etc. Dropping your watch or otherwise subjecting it to strong impact, however, can lead to malfunction. Note that watches with shock-resistant designs (G-SHOCK, BABY-G, G-MS) can be worn while operating a chain saw or engaging in other activities that generate strong vibration, or while engaging in strenuous sports activities (motocross, etc.)
Magnetism
Though a digital watch normally is not affected by magnetism, very strong magnetism (from medical equipment, etc.) should be avoided because it can cause malfunction and damage to electronic components.
Electrostatic Charge
Exposure to very strong electrostatic charge can cause your watch to display the wrong time. Very strong electrostatic charge even can damage electronic components.
Electrostatic charge can cause the display to go blank momentarily or cause a rainbow effect on the display.

Chemicals
Do not allow your watch to come into contact with thinner, gasoline, solvents, oils, or fats, or with any cleaners, adhesives, paints, medicines, or cosmetics that contain such ingredients. Doing so can cause discoloration of or damage to the resin case, resin band, leather, and other parts.
Storage
If you do not plan to use your watch for a long time, thoroughly wipe it free of all dirt, sweat, and moisture, and store it in a cool, dry place.
Resin Components
Allowing your watch to remain in contact with other items or storing it together with other items for long periods while it is wet can cause color on resin components to transfer to the other items, or the color of the other items to transfer to the resin components of your watch. Be sure to dry off your watch thoroughly before storing it and make sure it is not in contact with other items.
Leaving your watch where it is exposed to direct sunlight (ultraviolet rays) for long periods or failure to clean dirt from your watch for long periods can cause it to become discolored.
Friction caused by certain conditions (strong external force, sustained rubbing, impact, etc.) can cause discoloration of painted components.
If there are printed figures on the band, strong rubbing of the printed area can cause discoloration.
Leaving your watch wet for long periods can cause fluorescent color to fade. Wipe the watch dry as soon as possible after it becomes wet.
Semi-transparent resin parts can become discolored due to sweat and dirt, and if exposed to high temperatures and humidity for long periods.
Daily use and long-term storage of your watch can lead to deterioration, breaking, or bending of resin components. The extent of such damage depends on usage conditions and storage conditions.

Leather Band
Allowing your watch to remain in contact with other items or storing it together with other items for long periods while it is wet can cause the color of the leather band to transfer to the other items or the color of the other items to transfer to the leather band. Be sure to dry off your watch thoroughly with a soft cloth before storing it and make sure it is not in contact with other items.
Leaving a leather band where it is exposed to direct sunlight (ultraviolet rays) for long periods or failure to clean dirt from a leather band for long periods can cause it to become discolored.
CAUTION: Exposing a leather band to rubbing or dirt can cause color transfer and discoloration.
Metal Components
Failure to clean dirt from metal components can lead to formation of rust, even if components are stainless steel or plated. If metal components exposed to sweat or water, wipe thoroughly with a soft, absorbent cloth and then place the watch in a well-ventilated location to dry.
Use a soft toothbrush or similar tool to scrub the metal with a weak solution of water and a mild neutral detergent, or with soapy water. Next, rinse with water to remove all remaining detergent and then wipe dry with a soft absorbent cloth. When washing metal components, wrap the watch case with kitchen plastic wrap so it does not come into contact with the detergent or soap.

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Watch Operation Guide 3495

Bacteria and Odor Resistant Band
The bacteria and odor resistant band protects against odor generated by the formation of bacteria from sweat, which ensures comfort and hygiene. In order to ensure maximum bacteria and odor resistance, keep the band clean. Use an absorbent soft cloth to thoroughly wipe the band clean of dirt, sweat, and moisture. A bacteria and odor resistant band suppresses the formation of organisms and bacteria. It does not protect against rash due to allergic reaction, etc.
Liquid Crystal Display
Display figures may be difficult to read when viewed from an angle.
Note that CASIO Computer Co., Ltd. assumes no responsibility for any damage or loss suffered by you or any third party arising through the use of your watch or its malfunction.

User Maintenance
Caring for Your Watch
Remember that you wear your watch next to your skin, just like a piece of clothing. To ensure your watch performs at the level for which it is designed, keep it clean by frequently wiping with a soft cloth to keep your watch and band free of dirt, sweat, water and other foreign matter.
Whenever your watch is exposed to sea water or mud, rinse it off with clean fresh water.
For a metal band or a resin band with metal parts, use a soft toothbrush or similar tool to scrub the band with a weak solution of water and a mild neutral detergent, or with soapy water. Next, rinse with water to remove all remaining detergent and then wipe dry with a soft absorbent cloth. When washing the band, wrap the watch case with kitchen plastic wrap so it does not come into contact with the detergent or soap.
For a resin band, wash with water and then wipe dry with a soft cloth. Note that sometimes a smudge like pattern may appear on the surface of a resin band. This will not have any effect on your skin or clothing. Wipe with a cloth to remove the smudge pattern.
Clean water and sweat from a leather band by wiping with a soft cloth.
Not operating a watch crown, buttons, or rotary bezel could lead to later problems with their operation. Periodically rotate the crown and rotary bezel, and press buttons to maintain proper operation.
Dangers of Poor Watch Care
Rust
Though the metal steel used for your watch is highly rust-resistant, rust can form if your watch is not cleaned after it becomes dirty. Dirt on your watch can make it impossible for oxygen to come into contact with the metal, which can lead to breakdown of the oxidization layer on the metal surface and the formation of rust.

Rust can cause sharp areas on metal components and can cause band pins to fly out of position or to fall out. If you ever notice any abnormality immediately stop using your watch and take it to your original retailer or to an authorized CASIO service center.
Even if the surface of the metal appears clean, sweat and rust in crevasses can soil the sleeves of clothing, cause skin irritation, and even interfere with watch performance.
Premature Wear
Leaving sweat or water on a resin band or bezel, or storing your watch an area subject to high moisture can lead to premature wear, cuts, and breaks.
Skin Irritation
Individuals with sensitive skin or in poor physical condition may experience skin irritation when wearing a watch. Such individuals should keep their leather band or resin band particularly clean. Should you ever experience a rash or other skin irritation, immediately remove your watch and contact a skin care professional.
Battery
The special rechargeable battery used by your watch is not intended to be removed or replaced by you. Use of a rechargeable battery other than the special one specified for your watch can damage your watch.
The rechargeable (secondary) battery is charged when the solar panel is exposed to light, so it does not require regular replacement as the primary battery requires. Note, however, that long use or operating conditions can cause the capacity or charging efficiency of the rechargeable battery to deteriorate. If you feel that the amount of operation provided by charging is too short, contact your original retailer or CASIO service center.

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Watch Operation Guide 3495

Before Getting Started…
This section provides an overview of the watch and introduces convenient ways it can be used.
Watch Features Solar Charging
Sunlight and artificial light generate electricity for watch operation as it charges. Time Signal Reception The watch receives a radio signal containing time information and uses it to keep its time setting accurate. World Time You can display the current time in any one of 48 cities around the globe, as well as for UTC (Coordinated Universal Time). You can select up to five cities in the World Time Mode. Alarm An alarm sounds whenever a time specified by you is reached. Stopwatch The stopwatch measures elapsed time in units of one second (1/100 second for the first hour) up to 24 hours. Timer Countdown from a start time specified by you. An alarm sounds when the countdown reaches zero.
Note
The illustrations included in this operation guide have been created to facilitate explanation. An illustration may differ somewhat from the item it represents.

General Guide

ADay of the week BMonth, day CHour, minute, second
A button Holding down this button for at least two seconds in any mode displays the setting screen.
B button Press to turn on illumination.
C button Each press cycles between watch modes. In any mode, hold down this button for at least one second to return to the Timekeeping Mode.
D button Pressing this button while any setting screen is displayed will change the setting.

Indicators

AAppears when the time signal receive operation is successful.
BDisplayed while Power Saving is enabled.
CDisplayed during p.m. times while 12-hour timekeeping is being used.
DDisplayed while the button operation tone is disabled.
EDisplayed while the watch is indicating summer time.
FDisplayed while Auto Light is enabled.
GShows the current charge level.
HDisplayed while the snooze alarm is turned on.
IDisplayed while an alarm is turned on.
JDisplayed while the hourly time signal is enabled.

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Watch Operation Guide 3495

Navigating Between Modes
Press (C) to cycle between modes. In any mode, hold down (C) for at least one
second to return to the Timekeeping Mode.
Timekeeping Mode
$ $

Charging
This watch runs on power supplied from a rechargeable (secondary) battery that is charged by a solar panel. The solar panel is integrated into the face of the watch, and power is generated whenever the face is exposed to light.
Charging the Watch When you are not wearing the watch, put it in a location where it is exposed to bright light.

Checking the Charge Level A display indicator shows the watch’s current charge level.
Charge Level 1: Good All functions enabled.

Timer Mode

World Time Mode

$ Stopwatch Mode

$ Alarm Mode

$

While you are wearing the watch, make sure that its face (solar panel) is not blocked from light by the sleeve of your clothing. Power generation efficiency is reduced even when the face of the watch is blocked only partially.

YES

NO

Charge Level 2: Good All functions enabled.
Charge Level 3: Low [L] and [LOW] flash on the display and the functions below become disabled. Time signal reception Face illumination Sounds (alarm, etc.) All functions except for the Timekeeping
Mode

Important!
Depending on light intensity and local conditions, the watch may become hot to the touch when exposed to light for charging. Take care to avoid burn injury after charging. Also, avoid charging the watch under hightemperature conditions like the ones described below. On the dashboard of a vehicle parked in the sun Near an incandescent light bulb or other source of heat Under direct sunlight or in other hot areas for long periods
The display panel may become black under very high temperatures. This is temporary, and the display will return to normal at lower temperatures.

Charge Level 4: Low When the battery charge drops lower than Level 3, [CHG] starts to flash on the display and all functions become disabled.
Charge Level 5: Dead The digital display will go blank if the battery goes dead. Memory data is lost, and watch settings are returned to their initial factory defaults.
Important!
Should the battery go low or go dead, expose the face (solar panel) to light as soon as possible.

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Watch Operation Guide 3495

Note
When [H], [M], and [L] are all flashing on the display, it means that all functions are disabled due to momentary battery power consumption.

Charging Time Guidelines
The table below shows guidelines for approximate charging times.

Charging Times Required for 1 Day of Operation

Light Level (Lux)
50,000 10,000 5,000
500

Approximate Charging Time
8 minutes 30 minutes 48 minutes
8 hours

Charge Recovery Times Sunny day, outdoors (50,000 lux)

Dead battery n Medium charge Medium charge n High charge High charge n Full charge

3 hours 34 hours 10 hours

Sunny day, near a window (10,000 lux)

Dead battery n Medium charge Medium charge n High charge High charge n Full charge

10 hours 130 hours 35 hours

Overcast day, near a window (5,000 lux)

Dead battery n Medium charge Medium charge n High charge High charge n Full charge

16 hours 210 hours 57 hours

Indoor fluorescent lighting (500 lux)

Dead battery n Medium charge Medium charge n High charge High charge n Full charge

206 hours –

Note
Actual charging time depends on the charging environment, watch settings, and other factors.
Power Saving Function Leaving the watch in a dark location for about one hour between the hours of 10 p.m. and 6 a.m. will cause the display to go blank, and the watch to enter Level 1 power saving. If the watch is left in this condition for six or seven days, the watch will enter Level 2 power saving.
Power Saving Level 1 : Digital display goes blank to save power.
Power Saving Level 2 : Digital display goes blank to save power. All functions are disabled.
Recovering from Power Saving Operation Use one of the operations below to exit power saving. Press any button. Move the watch to a bright location. Trigger auto light by angling the watch
towards your face.
Note
The watch will not enter power saving in the cases below. While in the Stopwatch Mode While in the Timer Mode
You can enable or disable Power Saving as required. l Configuring Power Saving Function Settings
Note that the watch also may enter power saving if its face is blocked from light by your sleeve while you are wearing it.

Viewing the Face in the Dark
The watch has a light that illuminates the face for viewing in the dark. To illuminate the face manually Press (B) to turn on illumination. Illumination will turn off automatically if an
alarm starts to sound.
Important!
Frequent use of illumination will run down the battery.
Note
Display illumination is disabled when any one of the conditions below exists. Alarm, timer alert, or other beeper sounding Time calibration reception in progress
To illuminate the face when Auto Light is enabled
If Auto Light is enabled, face illumination will turn on automatically whenever the watch is positioned at an angle of 40 degrees or more.
40 degrees or more

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Watch Operation Guide 3495

Important!
Auto Light may not operate properly when the watch is at a horizontal angle of 15 degrees or greater from horizontal as shown in the illustration below.
Auto Light may operate unintentionally and run down the battery if the watch is blocked from light by your sleeve.
Electro-static charge or magnetism can interfere with proper auto light operation. If this happens, try lowering your arm and then angle it towards your face again.
When moving the watch you may note a slight rattling sound. This is due to operation of the auto light switch, which determines the current orientation of the watch. It does not indicate malfunction.
Note
Auto Light is disabled when any one of the conditions below exists. Alarm, timer alert, or other beeper sounding Time calibration reception in progress

Specifying the Illumination Duration You can select either 1.5 seconds or three seconds as the illumination duration.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

Time Adjustment
Your watch can receive time calibration signals and adjust its date and time setting.

3. Press (C) 12 times. This will cause [1] or [3] to appear on the display.
4. Press (D) to toggle between the two illumination duration settings. [1]: 1.5-second illumination [3]: 3-second illumination

Time Adjustment Using a Time Signal
Overview The watch’s time and day settings can be configured in accordance with a received time calibration signal.
Important!
In order to make it possible for the current time setting to be adjusted correctly based on time calibration signal reception, you need to specify the area where you are using the watch. l Setting a Home City

Configuring the Auto Light Setting
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (B) for at least three seconds to toggle Auto Light between enabled and disabled. [LT] is displayed while Auto Light is enabled.

5. Press (A) to complete the setting operation.

Note
Areas where time signal reception is supported are limited. When you are using the watch in an area where time calibration signal reception is not possible, adjust time and day settings manually. l Using Watch Operations to Adjust the Time Setting

On
Note Auto Light is disabled while [CHG] is
shown on the display.

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Watch Operation Guide 3495

Appropriate Signal Reception Location A time calibration signal can be received while the watch is near a window. Position the watch so its 12 o’clock side is facing the window. Keep metal objects away from the watch. Do not move the watch. Do not perform any operation on the watch.
12 o’clock
Note
You may experience time calibration signal reception problems in the areas described below. Among or near buildings While riding in a vehicle Near household appliances, office machines, mobile phones, etc. On a construction site, in an airport, or any other location where radio wave interference occurs Near high-voltage lines In mountainous areas or behind a mountain

Time Signal Reception Ranges
Japan (JJY) The Japan time signal radio stations are located on Mt. Otakadoya in Fukushima and Mt. Hagane in Fukuoka/Saga. The reception range of the Japanese time signals is approximately 1,000 km from each transmission station.
China (BPC) The China time signal radio station is located in Shangqiu, Henan Province, China. The reception range of the Chinese time signal is approximately 1,500 km from the transmission station.
United States (WWVB) The United States time signal radio station is located in Fort Collins, Colorado. The reception range of the U.S. time signal is approximately 3,000 km from the transmission station.
U.K. (MSF)/Germany (DCF77) The U.K. time signal radio station is located in Anthorn, Cumbria. The German time signal radio station is located in Mainflingen, southeast of Frankfurt. The reception range of the U.K. and German time signals is approximately 1,500 km from each transmission station.
Note
Even if you are within the normal reception range of a time calibration signal, reception may be made impossible by the following factors: geographic contours, weather, the season, the time of day, wireless noise.

Auto Time Calibration Signal Receive An automatic time calibration signal receive operation is performed and the time and day settings are adjusted between midnight and 5:00 a.m. Once a signal receive operation is successful, no more auto receive operations are performed that day.
1. Place the watch near a window or some other location appropriate for signal reception. [RCVD] flashes while time signal reception is in progress. When the receive operation is successful, the time and day settings are adjusted automatically, and the [RCVD] indicator appears.
Note
The receive operation typically takes anywhere from about three minutes to about eight minutes. It can take as long as 16 minutes.
Enabling and disabling Auto Receive You can stop auto receive by disabling the Auto Receive setting.
Note
While the Home City setting is one where time signal reception is possible, you can enable or disable auto receive as required. l Time Signal Reception Ranges
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

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Watch Operation Guide 3495

3. Press (C) 13 times. This causes [On] or [OFF] to flash on the display.
4. Press (D) to toggle between on and off. [On]: Auto Receive enabled. [OFF]: Auto Receive disabled.
5. Press (A) to complete the setting operation.
Note While the setting is being configured,
the watch will exit the setting operation automatically after about two or three minutes of non-operation.

Note
The receive operation typically takes anywhere from about three minutes to about eight minutes. It can take as long as 16 minutes.
Time calibration signal reception is better at night than during the day.
A time calibration signal cannot be received while the city selected as your Home City is one that does not support signal reception.
Receive Level Indicator While a receive operation is in progress, its current status is indicated on the display as shown below. Use the level indicator to find a location where signal reception is stable.
Receive level indicator

Manual Time Calibration Signal Receive
1. Place the watch near a window or some other location appropriate for time signal reception.
2. Enter the Timekeeping Mode. l Navigating Between Modes
3. Hold down (D) for at least two seconds until [RCVD] flashes. This indicates that the receive operation has started. After the receive operation is complete, the watch’s time and day settings will be adjusted accordingly.
Receive level indicator
The level indicator shows the signal level ([L1], [L2], [L3]) while a receive operation is in progress. l Receive Level Indicator

Unstable

Stable

Note
It takes about 10 seconds for time signal reception conditions to stabilize.
Reception conditions are affected by weather, the time of day, the surrounding environment, etc.

Checking the Last Time Adjustment Result
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Press (D). This displays the date and time of the last successful receive operation.
Receive month and day

Note
Even if there was a successful receive operation, [RCVD] will not be displayed if you subsequently adjusted the time and/or date setting manually.
Signal Reception Precautions
When the watch is unable to adjust its time in accordance with a calibration signal for some reason, average timekeeping accuracy is within ±15 seconds per month.
Note that an internal decoding process the watch performs after it receives a signal may cause the time setting to be slightly off (by less than one second).
Time calibration signal reception is not possible under the conditions described below. While battery power is low In any mode besides the Timekeeping Mode or World Time Mode When the watch is at Level 2 power saving While a timer countdown operation is in progress While the Home City area setting is one where time signal reception is not possible While the watch is outside the time signal reception range
When the receive operation is successful, the time and/or day settings will be adjusted automatically. Summer time will not be applied correctly in the case described below. When the summer time start date and time, end date and time, or other rules are changed by authorities
As of July 2020, China does not observe summer time. If China starts to observe summer time in the future, the time displayed by the watch for China may not be correct.

Receive time

10

Watch Operation Guide 3495

Using Watch Operations to Adjust the Time Setting
If, for some reason, you cannot use time signal reception to adjust the current time setting, you can adjust date, time, and Home City settings manually using watch button operations.
Setting a Home City Use the procedure in this section to select a city to use as your Home City. If you are in an area that observes summer time, you can also configure a summer time setting.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City
3. Use (B) and (D) to change the Home City setting. Holding down (B) or (D) scrolls through settings at high speed. For details refer to the information below. l City Table
4. Press (C).
5. Use (D) to select a summer time setting. Each press of (D) cycles through available settings in the sequence shown below. [AUTO] The watch switches between standard time and summer time automatically. [OFF] The watch always indicates standard time. [ON] The watch always indicates summer time.

Note
The [AUTO] summer time setting is valid only when the watch’s Home City is in an area where a time signal can be received.
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.
Setting the Time/Date You can use the procedure below to adjust the time and date settings when using the watch where signal reception is not possible.
Important!
If you are using the watch in an area where signal receive operations are possible, time and date settings using the time signal is recommended.
Configure the Home City setting before changing the current time and date settings. l Setting a Home City
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

3. Keep pressing (C) until the setting you want to change is flashing. Each press of (C) moves the flashing to the next setting in the sequence shown below.
Home City
Summer time
Seconds
Hours
Minutes
Year
Month
Day
12/24-hour timekeeping
Date display format
Day of the week language
Operation tone enable/disable
Illumination duration
Auto Receive

6. Press (A) to complete the setting operation.

Power Saving

11

Watch Operation Guide 3495

4. Configure the date and time settings. To reset the seconds to 00: Press (D). 1 is added to the minutes when the current count is between 30 and 59 seconds. For all the other settings, use (B) and (D) to change the flashing setting. Holding down (B) or (D) scrolls through settings at high speed.
5. Repeat steps 3 and 4 to select time and date settings.
6. Press (A) to complete the setting operation.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.
Switching between 12-hour and 24hour Timekeeping
You can specify either 12-hour format or 24hour format for the time display.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

4. Press (D) to toggle the setting between [12H] (12-hour timekeeping) and [24H] (24-hour timekeeping).

12-hour timekeeping

24-hour timekeeping

5. Press (A) to complete the setting operation.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

World Time
You can view the current time in 48 cities (31 time zones), and UTC (Coordinated Universal Time) time.

Checking World Time
1. Enter the World Time Mode. l Navigating Between Modes Entering the World Time Mode causes a World Time number and city name to appear first. After that, the display will appear as shown below.
World Time number

World Time

Home City time

To change the selected World Time city, press (D).

3. Press (C) eight times.
This causes [12H] or [24H] to flash on the display.

12

Watch Operation Guide 3495

World Time City Setting
You can specify up to five cities as your World Time favorites. If you are in an area that observes summer time, you can also enable or disable summer time.

1. Enter the World Time Mode.
   l Navigating Between Modes 2. Use (D) to display the World Time number
   whose setting you want to configure.
   3. Hold down (A) for at least two seconds. This causes [WT] to flash on the display.

Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.
While [UTC] is selected as the city, you will not be able to change or check the summer time setting.
The summer time setting you configure is applied to the currently selected city only. It does not affect other cities.
Swapping Your Home Time and World Time
In the World Time mode, press (A) and (B) at the same time to swap your Home City time with your World Time.

Alarm
The watch will beep when the alarm time is reached. You can configure up to four standard daily alarms, and one daily alarm with snooze. The hourly time signal causes the watch to beep every hour on the hour. Snooze causes the alarm to sound up to
seven times, at five-minute intervals. The alarm sound is muted in the cases
described below. When battery power is low When watch is at Level 2 power saving
l Power Saving Function

4. Use (B) and (D) to display the city you want to specify as a World Time City. Holding down (B) or (D) scrolls through settings at high speed.
5. If you want to change the summer time setting, press (C).
6. Use (D) to select a summer time setting. [OFF] The watch always indicates standard time. [ON] The watch always indicates summer time.
7. Press (A) to complete the setting operation.

Before swapping Home Time
World Time

After swapping World Time

Home Time

Configuring Alarm Settings
1. Enter the Alarm Mode. l Navigating Between Modes
2. Use (D) to display the alarm screen (alarm number [1] to [4] or [SNZ]) whose setting you want to change.
Alarm number

Alarm time
3. Hold down (A) for at least two seconds. This causes the hours digits to flash. While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

Hours

13

Watch Operation Guide 3495

4. Use (B) and (D) to change the hour setting.
Holding down (B) or (D) scrolls through settings at high speed.
If you are using 12-hour timekeeping, [P] indicates p.m.

Configuring the Hourly Time Signal Setting
1. Enter the Alarm Mode. l Navigating Between Modes
2. Press (D) to display the hourly time signal screen ([SIG]).

1. Enter the Alarm Mode. l Navigating Between Modes
2. Use (D) to display the item whose on/off setting you want to change: alarm number [1] to [4] or [SNZ], or the hourly time signal ([SIG]) screen.
Alarm or hourly time signal

5. Press (C). This causes the minutes digits to flash.
Minutes
6. Use (B) and (D) to change the minute setting.
7. Press (A) to exit the setting screen. To stop the alarm To stop the alarm after it starts to sound when an alarm time is reached, press any button. Snooze causes the alarm to sound up to seven times, at five-minute intervals. To cancel a snooze alarm, turn [SNZ] off. l Turning Off an Alarm or the Hourly Time
Signal
Note
A beeper will sound for 10 seconds to let you know when the alarm time is reached.
The watch will automatically return to the Timekeeping Mode from the Alarm Mode after two or three minutes of nonoperation.

3. Press (A) to toggle the hourly time signal between enabled and disabled. [SIG] (hourly time signal) is shown on the display while the hourly time signal is enabled.
Turning Off an Alarm or the Hourly Time Signal
To stop an alarm or the hourly time signal from sounding, perform the steps below to turn it off. To have an alarm or hourly time signal
sound again, turn it back on.
Note
Indicators are displayed while any of the alarms or the hourly time signal is turned on.
The applicable indicators are not displayed while all of the alarms are turned off and/or the hourly time signal is turned off.
Alarm

3. Press (A) to turn off the displayed alarm or the hourly time signal. Each press of (A) toggles between ON and OFF. Turning off all alarms will cause [ALM] (alarm) to disappear from the display, while disabling the hourly time signal causes [SIG] (hourly time signal) to disappear from the display.
Note
If [ALM] (alarm) is still displayed, it means that another alarm is still turned on. To turn off all of the alarms, repeat steps 2 and 3 until the [ALM] (alarm) indicator is no longer displayed.

Snooze

Hourly time signal

14

Watch Operation Guide 3495

Stopwatch
The stopwatch can measure elapsed time up to 23 hours, 59 minutes, 59 seconds (24 hours).

Measuring Elapsed Time

1. Enter the Stopwatch Mode. l Navigating Between Modes
2. Use the operations below to measure elapsed time.
D Start

D Stop

D Resume

D Stop
Elapsed time is shown in 1/100-second units for the first hour of the measurement. After the first hour, elapsed time is shown in one-second units.

First hour

After first hour

Measuring a Split Time

1. Enter the Stopwatch Mode. l Navigating Between Modes
2. Use the operations below to measure elapsed time.
Pressing (A) displays the elapsed time from the start of a race up to the point when you pressed the button (split time).
D Start

A Split

A Split release

D Stop
Elapsed time is shown in 1/100-second units for the first hour of the measurement. After the first hour, elapsed time is shown in one-second units.

First hour

After first hour

Minutes, seconds, 1/100 seconds

Hour, minute, second

3. Press (A) to reset the measurement time to all zeros.

Timing the First and Second Place Finishers

1. Enter the Stopwatch Mode. l Navigating Between Modes
2. Use the operations below to measure elapsed time.
D Start

A 1st Finisher*

D 2nd Finisher*

• This displays the time of the first finisher.
  Elapsed time is shown in 1/100-second units for the first hour of the measurement. After the first hour, elapsed time is shown in one-second units.

First hour

After first hour

Minutes, seconds, 1/100 seconds

Hour, minute, second

3. Press (A) to display the time of the second finisher.
4. Press (A) to reset the measurement time to all zeros.

Minutes, seconds, 1/100 seconds

Hour, minute, second

3. Press (A) to reset the measurement time to all zeros.

15

Watch Operation Guide 3495

Timer
The timer counts down from a start time specified by you. A beeper sounds when the end of the countdown is reached. The beeper is muted when battery power is
low.
Setting the Time
The countdown start time can be set in 1second units up to 24 hours. If a timer countdown operation is in
progress, reset the timer to its current start time before performing this operation. l Using the Timer 1. Enter the Timer Mode.
l Navigating Between Modes 2. Hold down (A) for at least two seconds.
This causes the hours digits to flash.
Hours
3. Use (B) and (D) to change the timer hours setting. Holding down (B) or (D) scrolls through settings at high speed.
4. Press (C). This causes the minutes digits to flash.
Minutes
5. Use (B) and (D) to change the timer minutes setting.

6. Press (C). This causes the seconds digits to flash.
Seconds
7. Use (B) and (D) to change the seconds setting.
8. Press (A) to exit the setting screen. Note While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation. Setting a start time of [0:00 00] will perform a countdown of 24 hours.
Using the Timer
1. Enter the Timer Mode. l Navigating Between Modes
Hour, minute, second
2. Use the operations below to perform a timer operation.
D Start
(Countdown starts)
D Pause
D Resume
(Time up)
A beeper will sound for 10 seconds to let you know when the end of a countdown is reached.
To reset a paused countdown to the start time, press (A).
3. Press any button to stop the tone.

Other Settings
This section explains other watch settings you can configure.
Changing the Date Display Format
You can select either month/day or day/month as the date display format.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

3. Press (C) nine times.
This displays a screen for selecting the date display format.

4. Use (D) to select a date display format. M: Month DD: Day

Month, day

Day, month

5. Press (A) to exit the setting screen.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

16

Watch Operation Guide 3495

Specifying the Day of the Week Language
You can select any one of six languages for the day of the week display in the Timekeeping Mode.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

Enabling the Button Operation Tone
Use the procedure below to enable or disable the tone that sounds when you press a button.
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

Configuring Power Saving Function Settings
1. Enter the Timekeeping Mode. l Navigating Between Modes
2. Hold down (A) for at least two seconds. Release the button when the name of the currently selected Home City appears on the display.
Home City

3. Press (C) 10 times. This causes the language setting to flash.

3. Press (C) 11 times.
This causes [KEY] or [MUTE] to flash on the display.

3. Press (C) 14 times. This displays [POWER SAVING].

4. Use (D) to select a language. [ENG]: English [ESP]: Spanish [FRA]: French

5. Press (A) to exit the setting screen.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.

4. Use (D) to select [KEY] or [MUTE]. [KEY]: Operation tone enabled. [MUTE]: Operation tone muted.
5. Press (A) to exit the setting screen. Note While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation. Note that alarm and timer tones will still sound even while the operation tone is muted.

4. Press (D) to toggle between ON and OFF. [On]: Power Saving enabled. [OFF]: Power Saving disabled.
5. Press (A) to exit the setting screen.
Note
While the setting is being configured, the watch will exit the setting operation automatically after about two or three minutes of non-operation.
For details about Power Saving, refer to the information below. l Power Saving Function

17

Watch Operation Guide 3495

Other Information
This section provides non-operational information you also need to know. Refer to this information as required.

City Table

City

Offset

UTC LISBON *

Coordinated

Universal Time

Lisbon

0

LONDON *

London

MADRID *

Madrid

PARIS *

Paris

ROME *

Rome

+1

BERLIN *

Berlin

STOCKHOLM * Stockholm

ATHENS *

Athens

CAIRO

Cairo

+2

JERUSALEM Jerusalem

MOSCOW

Moscow

+3

JEDDAH

Jeddah

TEHRAN

Tehran

+3.5

DUBAI

Dubai

+4

KABUL

Kabul

+4.5

KARACHI

Karachi

+5

DELHI

Delhi

+5.5

KATHMANDU Kathmandu +5.75

DHAKA

Dhaka

+6

YANGON

Yangon

+6.5

BANGKOK

Bangkok

+7

SINGAPORE Singapore

HONG KONG * Hong Kong

+8

BEIJING *

Beijing

TAIPEI *

Taipei

SEOUL *

Seoul

+9

TOKYO *

Tokyo

ADELAIDE

Adelaide

+9.5

GUAM

Guam

+10

SYDNEY

Sydney

NOUMEA

Noumea

+11

WELLINGTON Wellington

+12

PAGO PAGO Pago Pago

-11

HONOLULU Honolulu

-10

ANCHORAGE Anchorage

-9

VANCOUVER Vancouver -8
LOS ANGELES Los Angeles

EDMONTON * Edmonton

-7

DENVER *

Denver

MEXICO CITY * Mexico City

-6

CHICAGO *

Chicago

NEW YORK * New York

-5

HALIFAX *

Halifax

-4

City

ST. JOHN’S * St. John’s

BUENOS AIRES Buenos Aires

RIO DE JANEIRO Rio de Janeiro

F.

DE

NORONHA

Fernando Noronha

de

PRAIA

Praia

Offset -3.5 -3
-2 -1

• Cities where time calibration signal reception is possible.

The information in the above table is current as of July 2020.

Time zones may change and UTC differentials may become different from those shown in the table above.

Specifications
Accuracy at normal temperature : ±15 seconds per month average when time adjustment using signal reception is not possible.
Timekeeping : Hour, minute, second, year, month, day, day of the week a.m./p.m.(P)/24-hour timekeeping Full Auto Calendar (2000 to 2099) Year display on setting screen only.
Signal Receive Functions : Auto receive, manual receive Auto transmitter selection (for JJY, MSF/ DCF77) Receivable call signs: JJY (40 kHz/60 kHz), WWVB (60 kHz), MSF (60 kHz), DCF77 (77.5 kHz), BPC (68.5 kHz) Automatic and manual switching between standard time and summer time.
World Time : 48 cities (31 time zones) and Coordinated Universal Time (UTC) Summer time Home Time swapping
Alarm : Alarms: 5 (with one snooze alarm) Setting units: Hours, minutes Alarm tone duration: 10 seconds Hourly time signal: Beep every hour on the hour

Stopwatch : Measurement units: 1/100 seconds (first hour); 1 second (after first hour) Measuring range: 23 hours, 59 minutes, 59 seconds (24 hours) Measurement Functions: Elapsed time, split times, 1st and 2nd place finisher times
Timer : Measuring unit: 1 second Countdown range: 24 hours Time setting unit: 1 second 10-second beeper when the end of the countdown is reached
Other : Full auto LED light, light duration setting, Power Saving, charge level indication, operation tone enable/disable, selectable date format, selectable day of the week language, auto time adjustment enable/ disable
Power Supply : Solar panel and one rechargeable battery Battery operating time: Approximately 10 months Conditions: Not exposed to light under the conditions below. Time signal reception: 4 minutes/day Alarm: Once (10 seconds)/day Illumination: Once (1.5 seconds)/day Power Saving: 6 hours/day
Specifications are subject to change without notice.

18

Watch Operation Guide 3495

Troubleshooting
Signal Reception (Time Calibration Signal)
Q1 The watch cannot perform a receive operation.
Is the watch’s battery charged?
Signal reception is not possible while battery power is low. Keep the watch exposed to light until it recharges sufficiently. l Charging
Is the watch in the Timekeeping Mode or World Time Mode?
Time signal receive is not possible unless the watch is in the Timekeeping Mode or World Time Mode. Enter the Timekeeping Mode or World Time Mode. l Navigating Between Modes
Is your Home City setting correct for your location?
The watch will not indicate the correct time if the Home City setting is wrong. Change your Home City setting so it correctly reflects your location. l Setting a Home City
After checking the above, the watch still cannot perform a receive operation.
Time calibration signal reception is not possible under the conditions described below. When watch is at Level 2 power saving Timer countdown operation in progress If successful reception is not possible for some reason, you can adjust the time and day settings manually.

Q2 The signal receive operation always fails.
Is the watch in a location that is appropriate for signal reception?
Check your surroundings and move the watch to a location where signal reception is better. l Appropriate Signal Reception Location
Did you avoid touching the watch while the receive operation was in progress?
Minimize movement of the watch and do not perform any watch operation while a receive operation is in progress.
Is there an alarm configured to sound during the same period that the signal receive operation is performed?
Receive stops if an alarm operation starts while it is being performed. Disable the alarm. l Turning Off an Alarm or the Hourly
Time Signal
Is the signal transmitter in your area transmitting a signal?
The transmitter of the time calibration may not be transmitting a signal. Try again later.
Q3 Signal reception should have been successful, but the watch’s time and/ or day is wrong.
Adjust time and day settings manually. l Using Watch Operations to Adjust the Time
Setting
World Time
Q1 The time for a World Time City is not correct.
The summer time setting (standard time/ summer time) is wrong. l World Time City Setting

Charging
Q1 The watch does not work even though it is exposed to light.
The watch stops operating whenever the battery goes dead. Keep the watch exposed to light until it recharges sufficiently. l Checking the Charge Level
Q2 [H], [M], and [L] are flashing on the display.
The watch is in the charge recovery mode. Wait until the recovery process is complete (about 15 minutes). The watch will recover more quickly if you place it in a brightly lit location. If a signal receive operation, alarm, hourly
time signal, illumination and/or other powerintensive functions are used within a short period of time, the charge level of the battery will drop and cause the watch to go into a charge recovery mode. Function availability will be temporarily limited, but functionality will return after the battery recovers. l Checking the Charge Level
Q3 [CHG] is flashing on the display. The charge level of the watch is extremely low. Immediately expose the watch to light to charge it. l Checking the Charge Level
Other
Q1 I can’t find the information I need here.
Visit the website below. https://world.casio.com/support/

Alarm
Q1 The alarm does not sound. Is the alarm setting turned on? If it isn’t, turn it on so it will sound. l Configuring Alarm Settings

19

References

• Support | CASIO

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