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.
CC
C button sounds a confirmation tone and cycles through available modes in the sequence shown below.
CC
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
1
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
1
Level
2
Level
3
Level
4
Level
5
• 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.
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.
2
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.
BB
B
BB
AA
A button
AA
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.
❚
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
BB
B button to
BB
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
❚
Positioning Your Arm Correctly
11
1
11
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.
22
2
22
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
AA
A button twice
AA
to display the time setting
screen.
CC
C button twice
CC
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.
AA
A
AA
3
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.
❚
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.
AA
A button
AA
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
AA
A button.
AA
alert) or BEEP (beep alert) to
flash on the display.
DD
D button to
DD
toggle the alert setting
between VIB and BEEP.
appears when vibration alert it
selected. No indicator is
displayed while beep alert is
selected.
AA
A button twice to exit the setting screen.
AA
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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