G-Shock GW-400CDJ-2JF User Manual

MA0509-EA

Operation Guide 2931

Keep your watch exposed to light!

Your watch runs on electrical power generated from light and stored by a rechargeable battery. To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.

1. How the solar cell and battery work

When exposed to light

When not exposed to light

Your watch continues to operate, even when it is not exposed to light. Leaving the watch in the dark can run down its battery and cause functions to become disabled.

Light

Rechargeable battery

Power supplied to watch

Rechargeable battery

Power supplied to watch

Solar cell

Electrical energy

Charge

Discharge

2. Avoid overuse of display illumination.

• Over use of display illumination can run down the battery.

Rechargeable battery

Power supplied to watch

The following shows approximately how much exposure to light is required to recharge the battery by the amount used by one display illumination operation.

• Sunlight through a window: 5 minutes

• Indoor fluorescent lighting: 50 minutes

Care is required when using the full auto light switch, which can cause frequent display illumination.

Modes and Display Screens

Discharge

3. Tips on how to keep the battery charged.

• Try to ensure that the watch is always exposed to enough light to keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the watch’s functions are disabled when battery power drops to LEVEL 3.

Light

Battery Indicator

Level 1 Level 2

Rechargeable battery

• Whenever you are not wearing the watch on your wrist, position it so the face (solar cell) is pointed in the direction of a source of bright light.

Solar Cell

Light

Level 3 Level 4

Leave the watch under fluorescent lighting, near a window, etc.

All functions enabled

Some functions disabled

• When wearing the watch, try to keep your sleeve from blocking its face (solar cell).

Charging efficiency is significantly reduced even if the face of the watch is only partially covered by your sleeve.

Each press of the

• The watch will revert to the Timekeeping Mode automatically if you leave it in the Tide/Moon Graph Mode or Alarm Mode for about two or three minutes without performing any operation.

C button sounds a confirmation tone and cycles through available modes in the sequence shown below.

Timekeeping Mode

Graphic Area

(Display switching)

button

Receive indicator

button

(Mode switching)

PM indicator (no display for AM)

• For details about the Moon Graph, see “Using the Moon Graph (Moon Phase)”.

• For details about the battery indicator, see “Battery Indicator”.

• For details about the receive indicator, see “Receive Indicator”.

• Elements in the graphic area appear and disappear to indicate the passage of seconds.

Day of the Week

(Light)

Hour, Minute, Second

button

Month, Day Moon Graph

Battery Indicator

button

Switching between Display Screens

Each press of the cycles screen contents as shown below.

• For information about temperature sensor calibration, see “Setting the Home City Time and Date”.

• For information about the Tide Graph, see “Using the Tide Graph”.

Temperature Measurements

While the temperature screen is displayed, the watch takes temperature measurements every two minutes.

• When measuring outdoor temperatures, remove the watch from your wrist and place it in a location where its readings will not be affected by body temperature, sweat (water droplets), direct sunlight, etc.

• After removing the watch from your wrist, it takes about 20 to 30 minutes before the temperature of the watch becomes the same as the outside temperature.

• When you enter the Timekeeping Mode from the Alarm Mode, the area name (see the “Area List”) appears first. After a short while, the display changes to the date display.

Tide GraphTemperature

Mode Name

Month, Day

Alarm Number

Alarm Time

Tide/Moon Graph Mode Timer Mode

Year

PM indicator (A for AM)

Tide Graph

Moon Graph

Mode Name

Timer Time

Stopwatch ModeWorld Time ModeAlarm Mode

City Code

World Time

Mode Name

Time

Power Supply

The power supply of this watch uses a solar cell to generate electrical power, which is stored by a rechargeable battery. Using or storing the watch where it is not exposed to light regularly or allowing it to be blocked from light by your sleeve as you are wearing it can cause the power of the rechargeable battery to run down. To ensure stable operation, be sure to allow the watch to be exposed to light as much as possible when you are wearing or storing it.

Note that all data in memory and all settings are cleared whenever you allow the level of the rechargeable battery to drop to Level 5.

Flashing Recover Indicator

If you use the light or alarms a number of times during a short period, a RECOV indicator flashes on the display and the following operations become disabled as battery power recovers.

• Illumination

• Alarm and hourly time signal

• Timer Mode progress alert and

time up alarm

• Temperature measurement

• Time calibration signal reception

Normal operation will return after the battery recovers.

Recover Indicator

Operation Guide 2931

Battery Indicator

Level

• Exposing the watch to direct sunlight or other strong light may cause the battery level indicator to indicate a level that is momentarily higher than the actual battery level. Because of this, you should wait for a short while after charging to check the battery level indicator.

• Even if the battery level drops all the way to Level 5, you still will be able to recharge the battery and use the watch again.

• If you start charging from Level 5, the display of the watch will flash when the battery reaches Level 4. Note, however, that the watch’s functions will still remain disabled at this time, and you should continue to expose the watch to light so the battery can charge up the Level 2 or Level 1.

All functions enabled.

Illumination, alarms and other tones, temperature measurement, and time calibration signal reception disabled.

Display, illumination, alarms and other tones, temperature measurement, and time calibration signal reception disabled.

All functions, including timekeeping, disabled.

Start charging at Level 3 or 4!

Battery Level 3 or 4 indicates that remaining battery power is very low. Be sure to expose the watch to light for recharging as soon as possible after the Level 3 or Level 4 indicator starts to flash. Frequent display of the recover indicator also means that the battery is low. Expose the watch to light to charge the battery.

Charging Precautions

Avoid charging the watch in the following locations, and anywhere else where the watch may become very hot.

• On the dashboard of an automobile parked in the sun

• Very close to an incandescent light source or other sources of

heat

• In a location exposed to direct sunlight for long periods Note that the display panel may become black under very high temperatures. This is temporary, and the display will appear normal again at lower temperatures.

Depending on the light source you are using, the case of the watch may become quite hot during charging. Take care to guard against burn injury after charging.

❚

To charge the battery

Point the solar panel (face) of the watch at a light source.

• Remember that even a partial blockage of the solar cell reduces charging efficiency.

Example: Positioning the watch

Solar Cell

• The illustration shows the resin band model.

Charging Guide

Starting from a full charge, the watch should be able to continue operating for about eight months without further charging under the example conditions described below.

Example Daily Use

• Illumination: 1.5 seconds/day

• Alarm: 10 seconds/day (alternate

between beep and vibration alert every day)

• Signal Reception: 10 minutes/day

• Digital Display: 18 hours/day

Making sure the watch is exposed to light regularly ensures stable operation.

• Charge Times Required to Advance to a Higher Level

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a

Window (10,000 lux) Overcast Daylight

Through a Window

(5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

• Note that the above charging times are for reference only. Actual charging time depends on a variety of environmental factors.

Approximate Exposure Time

Level 5 \ Level 4 \ Level 3 \ Level 2 \ Level 1

2 hours

6 hours

10 hours

126 hours

Required Daily Charging Time

•

The following is the daily amount of charging required each day to support the operations under “Example Daily Use”.

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a

Window (10,000 lux) Overcast Daylight

Through a Window

(5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

Approximate

Exposure Time

5 minutes

24 minutes

48 minutes

8 hours

8 hours18 hours

41 hours91 hours

83 hours184 hours

– – – – – –

Power Saving

Power Saving causes the watch to enter a sleep state automatically in order to save power whenever it is left in the dark. The Power Saving feature of the watch is turned on at the factory.

• Note that the watch may also enter the sleep state if the watch is blocked from light by your sleeve.

❚

How the sleep state works

• Display sleep state

The display sleep state is triggered whenever the watch is left in the dark for about one hour between the hours of 10 p.m. and 6 a.m.

• The watch does not enter the sleep state if it is in the Timer Mode or Stopwatch Mode.

• The display sleep state causes the display to go blank, except for a flashing Power Saving indicator. Alarm, hourly time signal, and Timer Mode progress alert and time up alert operate normally in the display sleep state.

• Function sleep state

The function sleep state is triggered whenever the watch is left in the dark for six or seven days.

• The Power Saving indicator stops flashing and remains on the display. Alert, hourly time signal, and Timer Mode progress alert and time up alert do not operate in the function sleep state, and auto receive of the time calibration signal is not performed.

• Digital timekeeping functions continue to operate normally

in the function sleep state.

Power Saving Indicator

To recover from the sleep state

Place the watch in an area that is well-lit, press any button, or angle the watch toward your face to illuminate the face of the watch using the full auto light switch (“Positioning Your Arm Correctly”).

• It can take up to two seconds before display figures re-appear after you place the watch in a well-lit area.

❚

To turn Power Saving on and off

Use the procedure under “Setting the Home City Time and Date” to turn Power Saving on or off.

Leaving the watch in a drawer or anywhere else it is dark can cause Power Saving to trigger in order to conserve battery power.

Operation Guide 2931

Illumination

An EL (electro luminescent) panel is used to illuminate the display of the watch for easy reading in the dark. The full auto light switch automatically turns on illumination whenever you angle the watch towards your face for viewing, while it is dark.

❚

To turn on illuminination manually

In any mode, press the button.

• This turns on illumination.

• You can specify 1.5 seconds or

2.5 seconds as the illumination duration (“To specify the illumination duration”).

• Pressing the B button turns on illumination regardless of whether the full auto light switch is on or off.

You may hear a faint rattling sound when you move the watch around. This sound is caused by the movement of a metal bulb that controls operation of the full auto light switch, and does not indicate malfunction.

To specify the illumination duration

1. In the Timekeeping Mode,

hold down the for about two seconds until the city code and GMT differential start to flash. This is the setting screen.

A button

GMT Differential

City Code

Using the Full Auto Light Switch

The full auto light switch turns on illumination automatically whenever you angle the watch towards your face for reading, but only when it is dark.

• The full auto light switch does not turn on illumination when surrounding light is bright.

The full auto light switch turns on illumination for the specified illumination duration in all modes when the watch is angled towards the face.

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To turn the full auto light switch on or off

In any mode (except when a settings screen is on the display), hold down the B button for about three seconds to toggle the auto light switch on (AUTO EL indicator displayed) and off (no indicator displayed).

Full Auto Light On Indicator

4. Press the

• Each press of the B button

• : 1.5 seconds

B button to

select the illumination duration you want.

toggles the illumination duration between 1.5 seconds and 2.5 seconds. An indicator on the display shows which setting is currently selected.

: 2.5 seconds

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Positioning Your Arm Correctly

With the watch on your wrist, position it parallel with the ground.

• You should be wearing the watch on the outside of your wrist when using the full auto light switch.

• Make sure that the left (9 o’clock) and right (3 o’clock) sides of the watch are within ±15 degrees of being parallel with the ground. The full auto light switch may not operate properly if the angle is greater than 15 degrees.

Important!

• Illumination may be difficult to see under bright sunlight.

• Illumination turns off automatically if you press any button

causing a confirmation tone to sound or if an alert operation is performed.

• Illumination will not turn on while manual receive is in progress.

• You may notice a slight sound from the watch while illumination is turned on. This is the sound of EL panel vibration and does not indicate malfunction.

Rotate your arm so the watch is angled at about 40 degrees, so you can read its face.

Full Auto Light Precautions

• Frequent use of the full auto light switch can run down the battery.

• The full auto light switch is disabled while you are viewing tide

data.

• The full auto light switch may turn on illumination when the face of the watch is shaded by your sleeve.

• Illumination may not turn on immediately when you angle the watch towards your face. This does not indicate malfunction.

• Illumination remains on for the specified duration (1.5 seconds or

2.5 seconds) only, even if you leave the watch angled towards

At least 40 degrees

your face.

• The full auto light switch is disabled automatically whenever the battery indicator reaches Level 4.

• Illumination may turn on unintentionally when you wear the watch on the inside of your wrist, when you shake your arm, or when you raise your arm. Be sure to turn off the full auto light switch

whenever you do not need illumination.

• Keep the full auto light switch turned off whenever you are wearing the watch on the inside of your wrist.

• Electro-static charge and magnetism can interfere with full auto light switch operation and even make operation impossible. If this happens, lower your arm to the starting position and then raise it again. If you still have trouble with illumination, try lowering your arm down to your side and then raise it to your face for reading.

2. Press the

• This displays the DST setting.

3. Press the

A button twice

to display the time setting screen.

C button twice

so the seconds are flashing.

(Twice)

Seconds

5. When the setting is the way you want, press the

button to exit the setting screen.

• The display also will exit the setting screen automatically if you do not perform any operation for about two or three minutes.

Operation Guide 2931

Selecting Beeper or Vibration Alert

You can select either a beeper or vibration as the alert that is performed for the alarm, hourly time signal, or Timer Mode progress alert and time up alarm.

Beeper: The watch emits audible beeps. Vibration: The watch vibrates silently and a VIB indicator appears

on the display.

2. Press the

• This causes VIB (vibration

3. Press the

Vibration Indicator

• While vibration alert is selected, the watch does not emit any operation confirmation tones when you change modes, etc.

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To select beeper or vibration alert

1. In the Timekeeping Mode,

hold down the for about two seconds until the city code and GMT differential start to flash. This is the setting screen.

A button

GMT Differential

City Code

• The VIB (vibration) indicator

4. When the alert setting you want is displayed, press the

• The display also will exit the setting screen automatically if

Reception Ranges

This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB), depending on its current Home City setting.

• For information about selecting a Home City, see “Setting the Home City Time and Date”. For information about city codes, see the “GMT Differentials”.

Home City

TYO, OSA

LAX, DEN, CHI, NYC

Transmitter Location

Mt. Hagane

(60kHz)

500km

1000km

Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)

Fort Collins, Colorado signal

500km

1000km

Mt. Otakadoya

(40kHz)

Transmitter Location

A button.

alert) or BEEP (beep alert) to flash on the display.

D button to

toggle the alert setting between VIB and BEEP.

appears when vibration alert it selected. No indicator is displayed while beep alert is selected.

A button twice to exit the setting screen.

you do not perform any operation for about two or three minutes.

Transmitter

1000km

Vibration Indicator

3000km

Fort Collins

How a Radio-controlled Watch Works

What is a radio-controlled watch?

Your radio-controlled watch is designed to receive a time calibration signal that contains standard time data, and adjust its current time setting accordingly.

Signal is received by

Transmitter

Cesium

atomic clock

After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.

Long-wave time calibration signal

Signal data

Time data

Watch

Internally

built-in antenna.

Decode

Watch decodes received data and converts it to time data.

Time is adjusted according to time data.

Location

Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.

• You should think of your watch operating like a radio or TV when it is receiving the calibration signal.

Among or near buildings

Inside a vehicle (automobile, train, plane, etc.)

Near high-voltage lines

Next to a household appliance or office equipment (TV, speaker, fax, computer, cell phone, etc.)

Calibration Signal

• The Japanese calibration signal (Call Sign: JJY) is maintained by the National Institute of Information and Communications Technology (NICT). It is transmitted 24 hours a day from the Mt. Otakadoya transmitter (40kHz) located in Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane transmitter (60kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

• The U.S. calibration signal (Call Sign: WWVB) is transmitted by the National Institute of Standards and technology from Fort Collins, Colorado.

The time data of the Japanese calibration signal (Call Sign: JJY) is maintained by the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT). Note that transmission of the standard wave may be interrupted occasionally due to maintenance, lightning, etc. For more information, visit the website of the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT) at the following URL.

http://jjy.nict.go.jp

• Note that the above URL is subject to change.

Receiving the Calibration Signal

There are two methods you can use to receive the time calibration signal.

• Auto receive (Reception is performed automatically at

midnight, 1:00, 2:00, 3:00, and 4:00 each morning.)

• Manual receive (You initiate reception using a button

operation.)

• Once auto receive is successful on a particular day, the auto receive operation for subsequent times are not performed for that day.

•

If reception is not successful for any of the normal auto receive operations shown above, auto receive is performed one more time at 5:00 a.m.

• The watch is set up for auto receive at the factory, so all you need to do is to place it in a location that allows good reception each night.

❚

To position the watch for optimum reception

Remove the watch from your wrist and place it somewhere so its top (12 o’clock side, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep it away from metal objects.

Resin Band

• Under optimum conditions, the calibration signal should be receivable up to 1,000 kilometers from the transmitter. Note that the wave is relatively weak at distances greater than 500km, so reception may be poor at long distances.

• Geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

• Best reception is possible late at night.

• Under optimum conditions, the calibration signal should be

receivable up to 3,000 kilometers from the transmitter. Note that the wave is relatively weak at distances greater than 1,000km, so reception may be poor at long distances.

In a location where there is radio interference (construction site, airport, etc.)

If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.

Near mountains

Metal Band

• Orienting the watch so it is sideways to the transmitter makes it more difficult to receive the signal.

• Do not move the watch while it is receiving the calibration signal.

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